Showing papers on "Aluminium powder published in 2017"
TL;DR: In this article, the kinetics of aluminium reaction is manipulated to increase the porosity of geopolymers without adding extra foaming agent, and the impact on porosity development and the characteristics of binding skeleton is investigated.
99 citations
TL;DR: In this paper, the presence of n-TiC particles had a marked influence on the powder morphology, average particle size and microstructure of the matrix during the milling process.
87 citations
TL;DR: In this paper, the impact of aluminium reaction on the phase evolution of fly-ash based geopolymers is investigated using In-situ Fourier transform infrared spectroscopy (FTIR) and Atomic-force microscopy (AFM) results.
Abstract: Aluminium is widely used as a foaming agent in lightweight geopolymer concretes. The impact of aluminium reaction on the phase evolution of fly-ash based geopolymers is investigated. In-situ Fourier transform infrared spectroscopy (FTIR) is used to track the changes in the nanostructure of geopolymers. By combining the FTIR functional group analysis with Atomic-force microscopy (AFM) results, it is possible to evaluate the phase development during the early hours of reaction. At the initial stages of geopolymerization, aluminium reaction induces the formation of aluminium hydroxide gel which precipitates on fly ash and conceals the reactive surface of ash particles. Therefore, the dissolution rate of fly ash declines and the strength development is delayed. The high release rate of alumina into the solution, as a result of the aluminium metal reaction, leads to a better connectivity of unreacted particles and better microstructural development as shown in SEM images. Also, by consuming part of the sodium hydroxide catalyst at the beginning of the reaction, aluminium powder protects some of the alkali content of geopolymer matrix from carbonation.
61 citations
TL;DR: Directed metal deposition by means of laser beam is investigated in this article, where the process is receiving increasingly interest in the frame of additive manufacturing to the purpose of maintenance, and it is shown that the process can be used for a variety of applications.
Abstract: Directed metal deposition by means of laser beam is investigated in this article. The process is receiving increasingly interest in the frame of additive manufacturing to the purpose of maintenance...
43 citations
TL;DR: In this paper, the authors investigate the properties of high-energy ball-milled nanocrystalline aluminium powders and determine the optimum milling time required to produce an advanced aluminium powder for selective laser melting (SLM).
Abstract: The aim of this study is to investigate the properties of high-energy ball-milled nanocrystalline aluminium powders and to determine the optimum milling time required to produce an advanced aluminium powder for selective laser melting (SLM). Previous research has indicated that powders suitable for SLM include milled nanocrystalline aluminium powders with an average grain size of 60 nm and good flowability (Carr index less than 15 %). This study employs advanced nanometrology methods and analytical techniques to investigate the powder morphology, phase identification, average grain size and flowability of ball-milled powders. Stearic acid is used to prevent excessive cold welding of the ball-milled powder and to reduce abrasion of the grinding bowl and balls. The results indicate that, whilst the average particle size achieves a steady state after 14 h of milling, the grain size continues to decrease as the milling time progressed (e.g. the transmission electron microscopy measured average grain size is 56 nm after 20 h of milling compared to 75 nm for 14 h of milling). The aluminium powders milled for 16 and 20 h exhibit good flow behaviour, achieving a Carr index of 13.5 and 15.8 %, respectively. This study shows that advanced nanocrystalline aluminium powders suitable for SLM require ball milling for between 16 and 20 h, with 18 h being the optimum milling time.
33 citations
TL;DR: In this paper, a new cellular concrete design focused on the energy eco-efficiency and the sustainability concept is presented: geopolymer eco-cellular concrete (GECC), which is made from alkali-activated fluid cracking catalyst residue (FCC) aerated by recycled aluminium foil powders (R).
26 citations
TL;DR: In this article, the potential of combining metal forming and additive manufacturing to new process chains from the viewpoint of energy consumption was explored, and the energy requirements for metal forming, additive manufacturing and the combination of both processes were compared.
25 citations
TL;DR: In this article, two separate composites have been manufactured by the combination of hand layup technique and compression molding process, and their physio-mechanical properties such as density, micro-hardness, tensile strength and impact strength are evaluated.
23 citations
01 Jan 2017
TL;DR: In this article, the influence of the powder content on the mechanical properties of aerated concrete was investigated, namely, compressive and flexural strengths, modulus of elasticity, density and porosity.
Abstract: Aerated concrete is produced by introducing gas into a concrete, the amount dependent upon the requirements for strength. One method to achieve this is by using powdered aluminium which reacts with the calcium hydroxide produced upon hydration of the cement. The aim of the current study was to investigate the influence of the powder content on the mechanical properties of aerated concrete namely; compressive and flexural strengths, modulus of elasticity, density and porosity. The results indicated that an increase in aluminium content caused a decrease in the compressive and tensile strengths. It also produced a decrease in the modulus of elasticity. When the aluminium content increased, the density decreased and the porosity increased.
15 citations
TL;DR: In this article, an attempt has been made to analyze experimentally the wear rate of polymer composite made up of glass fiber reinforced epoxy resin filled with aluminium powder, which was described by experimentally obtaining the friction coefficients along with wear rates by using a pin-on-flat test apparatus for tribological applications.
11 citations
TL;DR: In this article, the effect of adding a small amount of aluminium powder (particle size ∼ 10 µm) to optimize waste-derived coal-water slurry with waste petrochemicals was investigated.
TL;DR: In this paper, an experimental study has been conducted to investigate the impact properties of metal matrix composites with Fly Ash particulates and S-glass fibers, and it has been observed that the addition of Fly Ash significantly improves impact strength as compared with that of unreinforced matrix.
Patent•
07 Jul 2017
TL;DR: In this paper, a preparation method for a composite material with a micro/nano core-shell structure was proposed, where the coordination effect of polyphenol hydroxyl compounds and a ferric ion solution was used to obtain uniform and compact coating effect.
Abstract: The invention discloses a preparation method for a composite material with a micro/nano core-shell structure. The method comprises the step of compounding micron-scale metal particles with nano-scale metal oxide particles to form the composite material with the micro/nano core-shell structure through the coordination effect of polyphenol hydroxyl compounds and a ferric ion solution, wherein the micron-scale metal particles are aluminium powder, iron powder, copper powder, nickel powder, tungsten powder or zinc powder with a particle size ranging from 1 [mu]m to 1000 [mu]m, and the nano-scale metal oxide particles are aluminium oxide, ferric oxide, ferroferric oxide, ferrous oxide, copper oxide, tungsten trioxide, nickel oxide or zinc oxide with a particle size ranging from 1nm to 1000nm. According to the preparation method disclosed by the invention, a shell material achieves a uniform and compact coating effect; and moreover, the preparation method is short in treatment time, a reagent is environmentally friendly and free of toxicity, and a post-treatment process is simple and convenient.
TL;DR: In this paper, thermal properties of waste-derived coal-water slurry with petrochemicals doped by small amount of aluminium and titanium dioxide powder were investigated. But the results were limited to 590-770°C.
Patent•
10 May 2017
TL;DR: In this paper, a rheological metal basecoat and a preparation method for its preparation is described, and the basecoat is prepared by the following raw materials: 4.5-10 parts of aluminium paste, 0.3-1 part of a dispersant, 10-25 parts of synthesized polyester resin, 10 -20 parts of acrylic resin, 5-7 parts of cellulose acetate butyrate,0.4-2.5 parts of an antifoaming agent, 1.5 -5 parts an auxiliary agent for preventing sinking and
Abstract: The invention discloses a rheological metal basecoat and a preparation method thereof. The rheological metal basecoat is prepared by the following raw materials: 4.5-10 parts of aluminium paste, 0.3-1 part of a dispersant, 10-25 parts of synthesized polyester resin, 10-20 parts of acrylic resin, 5-7 parts of cellulose acetate butyrate, 0.3-1.5 parts of an antifoaming agent, 0.4-2.5 parts of a leveling agent, 1.5-5 parts an auxiliary agent for preventing sinking and resisting sagging, 1.5-3.5 parts of an anti-settling agent, and 25-30 parts of a diluent. Flowing paint films generated by measuring rulers from original paint can be sprayed into wet films and dry films, and directional alignment of aluminium powder and pearl essence and other effect pigments in the films is uniform and stable, metallic effects are obvious and color is stable; the dry and wet films have small color difference, and are easy to be toned and constructed with high coating efficiency; at the same time, each performance index of the paint film completely reaches indices of oily aluminum powder paint.
Patent•
08 Sep 2017
TL;DR: In this paper, the authors provided a titanium element additive and a preparation technology thereof, which is prepared from components in parts by mass as follows: 28-32 parts of titanium powder, 18-22 parts of potassium fluoroaluminate and 2-5 parts of ammonium nitrate.
Abstract: The invention provides a titanium element additive and a preparation technology thereof. The titanium element additive is prepared from components in parts by mass as follows: 28-32 parts by mass of titanium powder, 18-22 parts by mass of potassium fluoroaluminate, 18-22 parts by mass of potassium fluorosilicate, 14-16 parts by mass of potassium fluotitanate, 14-16 parts by mass of potassium fluoborate, 4-6 parts by mass of activated aluminium powder and 2-5 parts by mass of potassium nitrate. Through formula optimization, the titanium element additive can have the violent physicochemical reaction with molten aluminium quickly after being added to the molten aluminium, a lot of heat is released, melt is heated quickly, the titanium powder is prompted to be melted into the molten aluminium, and an alloy is formed, so that the melting rate of the titanium powder is increased; and besides, the melt produced through the reaction has the relatively high spreading performance, the contact area of the titanium powder and the molten aluminium is increased, dissolution of the titanium powder in the molten aluminium is further increased, thus absorption of titanium elements in the molten aluminium can be substantially increased, then the production efficiency is improved, and the production cost is reduced.
Patent•
25 Aug 2017
TL;DR: In this article, a preparation method of carbon-calcium aluminate composite powder is presented, in which aluminium oxide is adopted as raw material, and organic acid calcium is used as the raw material by high temperature sintering.
Abstract: The invention provides a preparation method of carbon-calcium aluminate composite powder. By the method, aluminium oxide is adopted as raw material, and organic acid calcium is adopted as raw material, in non-oxidizing atmosphere, carbon-calcium aluminate composite powder is obtained by high temperature sintering. The organic acid calcium has two effects, organic acid acts as a calcium source and a carbon source, by taking advantage of this characteristic, in high temperature non-oxidizing atmosphere, sintering is conducted on organic acid calcium and aluminum oxide, pyrolysis is conducted on organic acid calcium, carbon is reduced, new generated calcium oxide and aluminium oxide in the raw materials react to form a calcium aluminate, carbon/calcium aluminium powder is synthesized in one step by utilizing this characteristic. The method has the characteristic of in-situ synthesis, and carbon source is added by means of chemical reactions, carbon source after the chemical reactions gets into composite materials, the dispersity of carbon is greatly increased, far superior to the dispersity of the carbon added by means of physical penetration in the prior art.
Patent•
22 Mar 2017
TL;DR: A soluble temporary plugging agent used for acidizing fracturing, and a preparation method thereof, is described in this paper, which is mainly composed of following soluble raw materials, by weight, 60 to 90% of the magnesium alloy particle, 6 to 39% of magnesium alloy sheet, and 1 to 4% of fiber.
Abstract: The invention discloses a soluble temporary plugging agent used for acidizing fracturing, and a preparation method thereof. The soluble temporary plugging agent is mainly composed of following soluble raw materials, by weight, 60 to 90% of magnesium alloy particle, 6 to 39% of magnesium alloy sheet, and 1 to 4% of fiber. The preparation method comprises following steps: 1, magnesium powder, aluminium powder, and iron powder obtained via drying pretreatment are delivered into a smelting furnace at a certain ratio, are heated to 660 to 700 DEG C under protection by an insert gas so as to melt the magnesium powder and the aluminium powder, and are stirred to as to realize uniform mixing of iron powder in an obtained magnesium aluminium melted liquid, an obtained mixture is subjected to thermal insulation for 25 to 35min at 660 to 700 DEG C, and is subjected to casting so as to obtain a bar material, and the bar material is cooled to room temperature; 2, the magnesium alloy bar material is processed into particles and sheets; and 3, the obtained magnesium alloy particle, the magnesium alloy sheet, and fiber are mixed with a carrying fluid at a certain ratio. The soluble temporary plugging agent possesses high temperature resistance, high plugging strength, stable plugging effect, excellent dissolving controllability, and high reliability.
Patent•
31 May 2017
TL;DR: In this paper, a corrosion-resistant electronic element coating consisting of the following components in parts by weight: epoxy resin 50-70 parts, graphite powder 3-5 parts, aluminium powder 80-85 parts, zinc powder 2-4 parts, nickel powder 1-3 parts, tin oxide 6-12 parts, sodium tripolyphosphate 2-6 parts, acetone 10-18 parts, methylcellulose 1.5-2.5 part, castor oil polyoxyethylene ether 40-80 parts and sorbic acid 20-
Abstract: The invention discloses a corrosion-resistant electronic element coating. The corrosion-resistant electronic element coating consists of the following components in parts by weight: epoxy resin 50-70 parts, graphite powder 3-5 parts, aluminium powder 80-85 parts, zinc powder 2-4 parts, nickel powder 1-3 parts, tin oxide 6-12 parts, sodium tripolyphosphate 2-6 parts, acetone 10-18 parts, methylcellulose 1.5-2.5 parts, castor oil polyoxyethylene ether 40-80 parts and sorbic acid 20-30 parts. A stable coating structure is formed, weather fastness, radiation protection ability and anti-static ability are excellent, the structure of the coating is stable in property and can protect an electronic element for a long time, and damage of foreign elements to the electronic element is reduced. The corrosion-resistant electronic element coating is excellent in corrosion resistance, and the metal surface does not have rusty spots even if the corrosion-resistant electronic element coating soaks in sodium chloride for 300-400 hours due to the fact that the corrosion resistance of the corrosion-resistant electronic element coating is improved to a certain degree by sorbic acid.
Patent•
15 Feb 2017
TL;DR: In this article, a refractory material with heat insulation and heat preservation as well as a preparation method thereof is described, which is prepared by the following raw materials: aluminum oxide, silicon oxide, magnesium carbonate, calcium oxide, titanium oxide, zirconium oxide, zinc oxide, water, sodium bicarbonate, a pore forming agent and the like.
Abstract: The invention discloses a refractory material with heat insulation and heat preservation as well as a preparation method thereof. The refractory material with heat insulation and heat preservation is prepared by the following raw materials: aluminum oxide, silicon oxide, magnesium carbonate, calcium oxide, titanium oxide, zirconium oxide, zinc oxide, water, sodium bicarbonate, a pore forming agent and the like. The pore forming agent comprises sucrose, carbon powder, aluminium powder, polyethylene microspheres, diatomite, copper sulfate pentahydrate, potassium dodecylbenzenesulphonate, water and the like. The refractory material with heat insulation and heat preservation is prepared by the following steps: pretreatment of raw materials, mixing of raw materials, steam curing, cutting and sintering, aftertreatment, and the like. The light type refractory material has the advantages of lower volume density and higher porosity, high available temperature and high compression strength, lower thermal conductivity, and good heat insulation effects.
TL;DR: In this article, the effect of process parameters like process temperature, pressure and time on tensile properties of a hybrid composite material is investigated and regression model is developed by neglecting time factor for the final run.
01 Jul 2017
TL;DR: In this paper, the amplitude dependent damping of the nanocomposites was measured at room temperature after thermal treatment of samples, and the linear thermal expansion was measured over a wide temperature range from room temperature up to 670K in the as-extruded state.
Abstract: Aluminium-matrix-nanocomposites were manufactured by ball milling of microscale aluminium powder with BN nanoparticles in air, followed by subsequent consolidation by hot extrusion. The microstructure of the samples was studied using scanning electron microscopy. Vickers microhardness measurements were used to probe the mechanical properties of the samples. The amplitude dependent damping of the nanocomposites was measured at room temperature after thermal treatment of samples, and the linear thermal expansion was measured over a wide temperature range from room temperature up to 670K in the as-extruded state. The experimental results give a comprehensive picture of the behaviour of this nanocomposite system over the range of thermomechanical treatment conditions examined in this study. Based on these experimental data some possible influences of BN nanoparticles on the anelastic, plastic and thermal properties of microcrystalline aluminium are discussed.
TL;DR: In this paper, the effect of reaction temperatures on phase composition and microstructure was investigated using X-ray diffraction and a scanning electron microscopy (SEM) respectively, and the thermodynamics equilibrium relationships of the condensed phases were analyzed as well.
Abstract: The ZrN–SiAlON composite refractory powder was successfully synthesised from zircon and bauxite minerals by the carbothermal reduction nitridation or the aluminothermic reduction nitridation method with three typical reducers, including carbon coke, carbon black and aluminium powder. The effect of reaction temperatures on phase composition and microstructure was investigated using X-ray diffraction and a scanning electron microscopy (SEM), respectively. The thermodynamics equilibrium relationships of the condensed phases were analysed as well. The results showed that carbon coke was the most optimum reducer and when it was used as the reducer, the main final products were granular ZrN with a little β-SiAlON. Nevertheless, ZrO2 was produced during reduction at 1600°C when the reducer was carbon black, because the activity of carbon black was the poorest. Additionally, more byproducts were produced in the case of Al powder used as reducer at 1600°C, such as AlN polytype and Al2O3.
Patent•
31 May 2017
TL;DR: In this article, a high-toughness flux-cored wire for electro-gas welding is proposed, which consists of a low-carbon steel outer skin and a flux core.
Abstract: The invention provides a high-toughness flux-cored wire for electro-gas welding. The high-toughness flux-cored wire for electro-gas welding comprises a low-carbon steel outer skin and a flux core. The flux core comprises the following components in percentages by weight by using the total weight of the flux core as reference: fluorite 3.5-6.5%, potassium titanate 4-8%, aluminium powder 5-10%, graphite 3-6%, molybdenum-iron powder 1-3%, silicon-manganese alloy 15-30%, silica 1 0-15%, ferrotianium 6-10%, magnesia 2-6%, manganese oxide 2-6% and the balance of iron powder. The filling rate of the flux core is 30-40%. The flux-cored wire has good electric arc stability, small in splashing and less in smoke dust, deslagging is facilitated, front and reverse surfaces of weld joints are good, property of restarting a weld is good, and high-requirement standard of the electro-gas welding can be met completely.
Patent•
29 Aug 2017
TL;DR: In this article, a high-strength aluminium-based material has been synthesized, which has the tensile strength no less than 600 MPa and hardness no more than 150 HB.
Abstract: The invention relates to the technical field of an alloy material, specifically to a preparation method of a high-strength aluminium-based material. The method comprises the following steps in sequence: putting rare earth oxide, aluminium powder and alloy element powder, according to a certain mass part, in sequence, into a high-energy vibro-milling apparatus to synthesize composite powder; pre-heating the prepared composite powder to reach a certain pre-heating temperature and performing thermal insulation; performing injection to make the high-energy vibro-milling apparatus at a certain pressure, wherein the pressurization speed is according to a certain constant speed; and performing cooling after pressurization is completed to obtain the high-strength aluminium-based material. The high-strength aluminium-based material has the tensile strength (at the room temperature) no less than 600 MPa and the hardness no less than 150 HB. The high-strength aluminium-based material can reach an international advanced level, fills the blank of a high-strength aluminium-based material at home, and has quite obvious social benefit.
Patent•
06 Jun 2017
TL;DR: In this article, a trivalent titanium reagent by utilizing calcined tail powder is presented. But the method is limited to the case where the tail powder can be used as a side product to reduce the production cost of the titanium powder.
Abstract: The invention relates to a sulphuric acid method titanium dioxide production process, and particularly discloses a method for preparing a trivalent titanium reagent by utilizing calcined tail powder. The method comprises the following steps: A, pulping the calcined tail powder; B, adding metered ammonium sulphate and concentrated sulphuric acid into tail powder pulp for dissolving at the temperature of 120 DEG C or higher; C, diluting a cooling solution and adding metered aluminium powder into the diluted liquid to obtain the trivalent titanium reagent. The method has the following advantages: (1) the recycling of titanium resource in the calcined tail powder is realized; (2) the method for preparing the trivalent titanium reagent by a side product, namely, the calcined tail powder, is provided, so that the production cost of the titanium powder is reduced; (3) the calcined tail powder is skilfully recycled by combining the method and the sulphuric acid method titanium dioxide production process, and the method is simple and is beneficial to being popularized in industry.
Patent•
13 Oct 2017
TL;DR: In this article, an aluminium-based high-energy particle is described, which comprises 90-95 parts of aluminium powder, 4.7-4.75 parts of an energetic binder, 0.25-0.3 part of a curing agent, and 0.1-1.15 parts of a catalyst.
Abstract: The invention discloses an aluminium-based high-energy particle, and a preparation method and application thereof. The aluminium-based high-energy particle comprises the following compositiosn in parts by mass: 90-95 parts of aluminium powder, 4.7-4.75 parts of an energetic binder,0.25-0.3 part of a curing agent, and 0.1-0.15 part of a catalyst. The energetic binder coats the surface of the aluminium powder through a curing crosslinking way, so that the reaction temperature at the aluminium powder surface is effectively improved during explosion, the ignition probability of the aluminium powder is improved and the reaction efficiency of the aluminium powder is improved.
TL;DR: In this article, the amplitude dependent damping of bending samples was determined by measuring the strain dependent logarithmic decrement of free decaying vibrations of bending beams at room temperature, and the electric conductivity was measured indirectly by permeability tests with a digital hysteresis recording devise.
Abstract: Aluminium-Matrix-Nanoparticle-Composites were produced by ball milling of micro scale Aluminium powder with various nanoscales ceramic powders like Silicon Carbide, Alumina and Boron Nitride with subsequent consolidation by hot extruding. The composites were investigated by amplitude dependent damping tests, tensile tests at elevated temperatures, hardness measurements, imaging methods and electric conductivity tests. All tested samples were machined out of hot extruded rods. The Amplitude dependent damping of bending samples was determined by measuring the strain dependent logarithmic decrement of free decaying vibrations of bending beams at room temperature. These tests were done after successive step by step isochronal heat treatments. Some samples show substantial improvement of the mechanical properties due to dispersion hardening or grain refinement. It can be concluded that the results are mainly influenced by dislocation effects like Orowan-effect, work-hardening, grain-size-hardening, recrystallization, and creation of dislocations at ceramic particles due to thermal mismatch. Moreover some results can be attributed to fatigue during mechanical cycling namely crack nucleation, crack growth and fraction. The electric conductivity was measured indirectly by permeability tests with a digital hysteresis recording devise. The results show the low influence of nano-particle dispersion hardening to conductivity in comparison of work-hardening.
Patent•
07 Nov 2017
TL;DR: In this article, a light-weight and high-strength aerated concrete and a preparation method for its preparation is described. But the preparation method comprises the following steps: 1) hair, an alkaline compound, sodium bisulfite and water are mixed, a protein solution is obtained, then an amphoteric surfactant, tortoise-plastron glue and the protein solution were mixed, and a foaming agent is obtained; 2) an aluminium source, the foaming agents and water, and an aluminium powder suspension was obtained; 3) cement, slag
Abstract: The invention discloses light-weight and high-strength aerated concrete and a preparation method thereof. The preparation method comprises the following steps: 1) hair, an alkaline compound, sodium bisulfite and water are mixed, a protein solution is obtained, then an amphoteric surfactant, tortoise-plastron glue and the protein solution are mixed, and a foaming agent is obtained; 2) an aluminium source, the foaming agent and water are mixed, and an aluminium powder suspension is obtained; 3) cement, slag, sand, hemp, formalized polyvinyl alcohol fibers, cyclodextrin, water and the foaming agent are mixed, then soluble oil, an alkaline solution and the aluminium powder suspension are mixed, and slurry is obtained; 4) reinforcing meshes are formed by weaving reinforcing steel bars coated with asphalt on surfaces, the slurry is poured to spaces between the multiple layers of the reinforcing meshes, and the light-weight and high-strength aerated concrete is prepared through curing. Curing comprises multiple continuous curing periods, and each curing period comprises a first curing section in a pressure increased environment and a second curing section in a pressure reduced environment. The light-weight and high-strength aerated concrete has excellent mechanical strength and density.
01 Dec 2017
TL;DR: In this article, the thermal conductivities of the above epoxy-aluminium composites (with varied volume fraction of aluminium in epoxy) were measured in the temperature range from 4.5 K to 300 K using a G-M cryocooler based thermal conductivity experimental set-up.
Abstract: Cryosorption pump is a capture vacuum pump which retains gas molecules by chemical or physical interaction on their internal surfaces when cooled to cryogenic temperatures. Cryosorption pumps are the only solution in nuclear fusion systems to achieve high vacuum in the environment of hydrogen and helium. An important aspect of this development is the proper adhesion of the activated carbons on the metallic panels using a high thermal conductivity and high bonding strength adhesive. Typical adhesives used are epoxy based. The thermal conductivity of the adhesive can be improved by using fine aluminium powder as the filler in the base epoxy matrix. However, the thermal conductivity data of such epoxy-aluminium composites is not available in literature. Hence, we have measured the thermal conductivities of the above epoxy-aluminium composites (with varied volume fraction of aluminium in epoxy) in the temperature range from 4.5 K to 300 K using a G-M cryocooler based thermal conductivity experimental set-up. The experimental results are discussed in this paper which will be useful towards the development of cryosoprtion pumps with high pumping speeds.