Showing papers on "Bimetal published in 2011"
TL;DR: In this paper, a copper/aluminum/copper sandwich clad sheet was fabricated by means of cold rolling process and heat treated with different temperature and time, and the results reveal that low temperature heat treatment can improve the morphology of Al/Cu interface and increase its bond strength.
Abstract: A copper/aluminum/copper sandwich clad sheet was fabricated by means of cold rolling process and heat treated with different temperature and time. The Al/Cu interface and its bond strength were investigated by SEM, TEM and peeling test. The results reveal that low temperature heat treatment can improve the morphology of Al/Cu interface and increase its bond strength. However high temperature and long time result in the formation of Al2Cu intermetallic compound layer, which is detrimental to the bond strength, and moreover, small Al2O3 particles precipitate along the Al2Cu and Al interface. When the interlayer along Al/Cu interface grows to a certain thickness, the effect of heat treatment temperature and time become weak. For the present study, the reasonable heat treatment may be 423 K and 20 h.
223 citations
TL;DR: It is indicated that Cu-Fe bimetal amidoximated PAN fiber complexes could more effectively catalyze the dye degradation in water than Fe amidoximate PAN fiber complex, especially in the dark and under visible light irradiation.
124 citations
TL;DR: Monodispersed carboxymethyl cellulose (CMC)-stabilized Fe-Cu bimetal nanoparticles with an average diameter of less than 20nm were successfully synthesized by a modified water-based approach and exhibited a core-shell structure and are quite uniform in size and shape.
81 citations
TL;DR: In this paper, high chromium cast iron and medium carbon steel bimetal was fabricated by liquid-solid casting in electromagnetic induction field and the interfacial structure and mechanical properties were investigated.
55 citations
TL;DR: In this paper, the effect of volume ratios of liquid to solid (6:1, 10:1 and 12:1) on the interfacial microstructure and mechanical properties of bimetal was investigated.
49 citations
TL;DR: The improved performance of the bimetal layer compared to that of an assay carried out on a pure gold layer is attributed to the enhanced evanescent field intensity of surface plasmons in thebimetal combination which excites more fluorescence hence producing an enhanced SPCE signal.
30 citations
TL;DR: In this paper, a new method for the preparation of bimetal phosphides was reported, where bulk and SiO2-supported porous NiCoP were obtained from the direct thermal treatment of precursors containing nickel, cobalt salts, and sodium hypophosphite mixed mechanically under flowing nitrogen.
29 citations
TL;DR: Rolled bimetallic structures are briefly reviewed in this article along with their applications in the manufacture of certain metal products applications of bimetals of different type are outlined. But their applications are not discussed.
Abstract: Production methods for rolled bimetallic structures are briefly reviewed, along with their applications in the manufacture of certain metal products Applications of bimetals of different type are outlined
28 citations
TL;DR: The catalytic combustion of ethyl acetate has been investigated in a series of mono‐metal silver and bimetal Ag–M (M: Fe, Co and Mn)‐modified HZSM‐5 zeolites to find a catalyst with high superior activity, selectivity towards deep oxidation product and stability.
Abstract: The catalytic combustion of ethyl acetate has been investigated in a series of mono‐metal silver and bimetal Ag–M (M: Fe, Co and Mn)‐modified HZSM‐5 zeolites. The objective was to find a catalyst w...
24 citations
TL;DR: Tests showed adsorption did not hinder extraction efficiency and that dechlorination products were only seen when using the bimetallic system, as opposed to any of its single components, and both contaminants were seen to degrade successfully.
23 citations
TL;DR: In this article, the average particle size of the catalytic composites is 63 nm and the ceria nanopowders sequentially impregnated in copper solution and then in Pt solution transformed into Pt-skin-structured Cu-Pt/ceria nanocomposite, based on the surface elemental and bulk compositional analyses.
Abstract: Cu-Pt bimetal catalysts supported on nanocrystalline CeO2 (nano-ceria) are synthesized via the low-cost sol-gel approach followed by impregnation processing. The average particle size of the catalytic composites is 63 nm. Ceria nanopowders sequentially impregnated in copper solution and then in Pt solution transformed into Pt-skin-structured Cu-Pt/ceria nanocomposite, based on the surface elemental and bulk compositional analyses. The ceria supporter has a fluorite structure, but the structure of Cu and Pt catalytic contents, not detected by X-ray diffraction spectroscopy due to the low loading level, is yet conclusive. The bimetallic catalytic nanocomposites may potentially serve as sulfur-tolerant anode in solid oxide fuel cells.
TL;DR: In this article, a novel graphene nanosheet (GNS) supported Cu-Ni bimetal catalysts were firstly synthesized and used for the direct synthesis of dimethyl carbonate (DMC).
TL;DR: A three-dimensional chiral-structured molecular magnet based on a Co-W bimetal assembly, [CoII(H2O)2][Co II(pyrimidine){(R)-1-(4-pyridyl)ethanol)}]2[WV(CN)8]2·7.5H 2O, is synthesized in this paper.
Abstract: A three-dimensional chiral-structured molecular magnet based on a Co–W bimetal assembly, [CoII(H2O)2][CoII(pyrimidine){(R)-1-(4-pyridyl)ethanol)}]2[WV(CN)8]2·7.5H2O, is synthesized. This compound e...
TL;DR: In this article, the effects of graphite content on tribological performance under reciprocal sliding were studied using the UMT-2MT tribo-meter, and the optimal performance of average friction coefficient, maximum friction coefficient and wear resistance was achieved at the graphitic content of ∼3.
Patent•
14 Sep 2011
TL;DR: In this paper, a bimetal mechanical composite wear-resistant steel tube with an outer layer (1) serving as a base layer and an inner layer (2)serving as a clad layer, wherein the base and the clad layers are mechanically compounded, and the clothed layer is made of bearing steel and the base layer is either low carbon steel or low-carbon steel.
Abstract: The invention discloses a bimetal mechanical composite wear-resistant steel tube and a production method thereof. The invention is characterized in that: the bimetal mechanical composite wear-resistant steel tube has an outer layer (1) serving as a base layer and an inner layer (2) serving as a clad layer, wherein the base layer and the clad layer are mechanically compounded; and the clad layer is made of bearing steel and the base layer is made of low-carbon steel or low-alloy steel. In bimetal mechanical combination, the inner and outer layers of steel tubes are tightly adhered through cold drawing, hot drawing, cold rolling, spinning, hot charging, cold charging, jacking and other means; therefore, the bimetal mechanical composite wear-resistant steel tube with the advantages of excellent wear resistance, high impact load resistance, high corrosion resistance, long service life and high safety performance under the pressure fluctuation working conditions is obtained.
Patent•
23 Nov 2011
TL;DR: In this paper, a bimetal composite hammer consisting of a head and a handle is presented, wherein the head is made of an alloying high-chromium cast iron containing 15 to 17 weight percent of Cr, and the handle is composed of carbon steel containing no more than 5 weight percent Cr.
Abstract: The present invention discloses a bimetal composite hammer. The hammer comprises a head and a handle, wherein the head is made of an alloying high-chromium cast iron containing 15 to 17 weight percent of Cr, and the handle is made of carbon steel containing no more than 5 weight percent of Cr; after the bimetal composite hammer is cast, the hammer is subjected to heat preservation at the temperature of 950+/-20 DEG C in a thermal treatment furnace for 3 to 5 hours, is subjected to air cooling and normalizing, and is tempered in the air at the temperature of between 250+/-20 DEG C for 3 to 5 hours. Furthermore, the invention also discloses a method for manufacturing the bimetal composite hammer. Two kinds of steel can be metallurgically combined excellently by effectively controlling the pouring temperatures, pouring speeds and intervals of two kinds of molten steel; the molten steel is subjected to reasonable deoxidizing and degassing operation, and bubbles and impurities of joint parts are avoided, so the strength and toughness of the joint parts are improved; a phenomenon that the handle and the head are separated or destroyed cannot occur, and the service life of the hammer is remarkably prolonged by 200 to 400 percent compared with that of the conventional hammer.
Patent•
11 May 2011
TL;DR: In this article, a copper-clad steel bimetal composite rod is prepared using a steel rod and a copper tube as raw materials, and a composite drawing is performed to obtain the composite rod.
Abstract: The invention relates to a preparation method of a copper-clad steel bimetal composite rod, belonging to the technical field of bimetal composite material preparation. The preparation method comprises the following steps of: (1) using a steel rod and a copper tube as raw materials; (2) carrying out the pretreatment of deoiling, derusting and drying on the steel rod and the copper tube; (3) rolling the head of the steel bar by a head rolling machine; (4) inserting the steel bar into the copper tube, carrying out the composite head rolling treatment by the head rolling machine; and (5) carrying out 2-3 passes of composite drawing to obtain the copper-clad steel bimetal composite rod. The method has the characteristics of simple process, high efficiency and low cost. The copper-clad steel bimetal composite rod prepared with the method has stable bonding performance in the copper-steel surface and great surface quality.
TL;DR: In this paper, the authors evaluated the method of manufacturing bimaterial composite parts by semisolid metal processing (SSP) through strain-induced melt-activated thixo-forging.
Abstract: This work evaluated the method of manufacturing bimaterial composite parts by semisolid metal processing (SSP) through strain-induced melt-activated thixo-forging. Sn-15 pct Pb and Pb-30 pct Sn semisolid alloys were chosen as model alloys. Bimetal composite parts were manufactured successfully by forging the semisolid alloys into the same die simultaneously. Optical photography, scanning electron microscopy, energy dispersive X-ray spectroscopy, and Vickers hardness were employed to characterize the samples. The results showed that the composite semisolid fluid flowed in a laminar way. Globular primary grains in the two semisolid alloys maintained their respective geometry and constitutions. The mixture of two liquid phases was limited in a thin layer beneath the interface between the two semisolid alloys. The absence of an oxide-enriched layer at the interface suggests that the oxide skins of the feedstock were torn during the processing, leading to the formation of metallurgical bonding at the composite interface. This work showed that SSP is a promising technology for bimaterial/multimaterial composite manufacturing. The bimaterial composite parts achieved by SSP have a good composite interface and well-located material distribution.
Patent•
26 Jan 2011
TL;DR: In this article, a method for preparing a copper-lead alloy/steel bimetal laminated composite material, which comprises the following steps of: treating a steel plate and preheating to the temperature of between 150 and 200 DEG C in a resistance furnace, coating saturated ZnCl2 solution on the surface of the steel plate, and pre-heating the composite material to a temperature between 200 and 600 DEGC.
Abstract: The invention discloses a method for preparing a copper-lead alloy/steel bimetal laminated composite material, which comprises the following steps of: treating a steel plate and preheating to the temperature of between 150 and 200 DEG C in a resistance furnace; coating saturated ZnCl2 solution on the surface of the steel plate and preheating to the temperature of between 200 and 600 DEG C; smelting copper-lead alloy liquid in a medium-frequency induction furnace, namely putting charcoal and electrolytic copper into the medium-frequency induction furnace in turn, adding tin and lead after the electrolytic copper is melted, uniformly mixing and deoxidizing to obtain the copper-lead alloy liquid; and preheating a graphite mold to the temperature of 600 DEG C in a box-type resistance furnace, putting a steel substrate into the graphite mold, casting the copper-lead alloy liquid at the temperature of between 950 and 1,100 DEG C, opening the mold to take the composite material out after the temperature of the alloy is reduced to 300 DEG C, and performing air cooling. The method has the advantages of simple process and low cost; and the composite material has the advantages of high interface bonding strength, good alloy structure, and capability of meeting the operational performance of the copper-lead alloy.
TL;DR: It has been found that the addition of copper to iron results in the suppression of carbonaceous impurity formation without decreasing the SWCNT yield, and the purity-enhanced SWC NT shows fairly low sheet resistance due to the improvement of inter-nanotube contacts.
Abstract: We report high purity and high yield synthesis of single-wall carbon nanotubes (SWCNTs) of narrow diameter from iron–copper bimetal catalysts. The SWCNTs with diameter of 0.8–1.2 nm are synthesized using the zeolite-supported alcohol chemical vapour deposition method. Single metal and bimetal catalysts are systematically investigated to achieve both the enhancement of SWCNT yield and the suppression of the undesired formation of graphitic impurities. The relative yield and purity of SWCNTs are quantified using optical absorption spectroscopy with an ultracentrifuge-based purification technique. For the single metal catalyst, iron shows the highest catalytic activity compared with the other metals such as cobalt, nickel, molybdenum, copper, and platinum. It has been found that the addition of copper to iron results in the suppression of carbonaceous impurity formation without decreasing the SWCNT yield. The purity-enhanced SWCNT shows fairly low sheet resistance due to the improvement of inter-nanotube contacts. This scalable design of SWCNT synthesis with enhanced purity is therefore a promising tool for shaping future high performance devices.
Patent•
12 Jan 2011
TL;DR: In this paper, a bimetal nano particle catalyst and a preparation method for its preparation in a mixed solvent is presented. But the preparation method is not suitable for the case of carbon nanotubes.
Abstract: The invention belongs to the technical field of inorganic/organic hybrid materials, in particular to a bimetal nano particle catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing the precursor of the catalyst in a mixed solvent by utilizing different solubilities of nickel acetylacetonate, platinum acetylacetonate and palladium acetylacetonate in different organic solvents or utilizing the synergistic action of platinum and palladium nano particles in the growth process, and finally, enabling the bimetal nano particles to be uniformly distributed on the surface of carbon nanotubes, thereby obtaining the bimetal nano particle catalyst. The composite catalyst has favorable catalysis performance in the catalytic organic coupled reaction, and the catalysis performance has potential application prospects in organic synthesis.
TL;DR: In this article, the impact toughness of three series of Charpy specimens that were cut from a continuous-caster roller and contained stress concentrators having different orientations relative to the hard-facing on the roller was made.
Abstract: A study was made of the impact toughness of three series of Charpy specimens that were cut from a continuous-caster roller and contained stress concentrators having different orientations relative to the hard-facing on the roller. Tests were performed on an automated impact tester. The steel with a ferrite-pearlite structure (steel 35G2) was found to have a higher impact toughness than steel with a ferrite-martensite structure (steel 18Kh11MNFB). The effect of microstructure on crack growth in the bimetal was studied experimentally for different types of steels. The results that were obtained can be used to check the impact toughness of hard-facings.
TL;DR: A lead-free bronze alloy powder with a dispersed sulphide solid lubricant phase has been produced by atomisation as a substitute for lead bronze friction materials as discussed by the authors, which is being assessed for use in high pressure bushes.
Abstract: A lead-free bronze alloy powder with a dispersed sulphide solid lubricant phase has been produced by atomisation as a substitute for lead bronze friction materials. The powder has been processed to produce a bronze/steel bimetal strip by a sinter/roll/sinter process route, via both solid state and liquid phase sintering. Friction properties of the developed materials and a sintered bronze were compared in pin-on-disc tests; the Cu–Sn–S material shows excellent properties, equivalent to those of a lead bronze, and is being assessed for use in high pressure bushes.
Patent•
23 Nov 2011
TL;DR: In this article, a process for manufacturing a bimetal thin-wall composite pipe is described, which comprises the following steps of processing a blank, continuously extruding the blank to compound the blank with a metal pipe, and feeding the processed blank bar and the metal pipe into a continuous extruder for compounding.
Abstract: The invention relates to a process for manufacturing a bimetal thin-wall composite pipe, which comprises the following steps of: processing a blank; continuously extruding the blank to compound the blank with a metal pipe, and feeding the processed blank bar and the metal pipe into a continuous extruder for compounding, wherein the continuous extruder is provided with two extrusion rollers which are symmetrically arranged and are controlled by a servo motor; keeping the metal pipe not deformed in the extrusion process, pressing the blank in grooves on the extrusion rollers, making the blank enter an extrusion cavity under the drive of friction force, raising the temperature of the blank under the double action of the friction force and extrusion deformation, and making the blank subjected to plastic deformation, extruded to a cavity and coated on the surface of the metal pipe along two symmetrical surfaces; drawing, namely feeding the bimetal composite pipe formed by continuous extrusion into drawing equipment, and designing the deformation size of a coating layer and the metal pipe in the drawing process to make the coating layer and the metal pipe synchronously deformed and have the same deformation; and sawing and finishing. The prepared bimetal thin-wall composite pipe does not have any weld seam, and is short in process flow and high in production efficiency.
Patent•
05 Dec 2011
TL;DR: A bimetal part for use as an active switching element in a temperature-dependent switch has at least one inner region (13 ) and an outer region (12 ) surrounding the inner region, the inner regions being formed such that in certain portions they are in one piece with one another and in certain parts they are mechanically separated from one another as discussed by the authors.
Abstract: A bimetal part ( 10 ) for use as an active switching element in a temperature-dependent switch has at least one inner region ( 13 ) and an outer region ( 12 ) surrounding the at least one inner region ( 13 ), the inner region ( 13 ) and the outer region ( 12 ) being formed such that in certain portions they are in one piece with one another and in certain portions they are mechanically separated from one another and being stamped in opposite directions, and at least one contact area ( 21 ) being provided on the inner region ( 13 ).
01 Jan 2011
TL;DR: In this paper, a special casting technique was used to prepare the bimetal composites, and a metallurgy interface was found, which provided high working security and a product rate of 95% was achieved by this special casting process.
Abstract: According to the characteristic of two liquid and bimetal composite interface,the influence of the casting techniques on the interface microstructure,wear and comprehensive properties were researched by using scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDAX).The results show that the casting technique has an effect on the surface quality and the stress state of the composites,but also has great effect on the interface microstructure,morphology and constitute phase.In this paper,a special casting technology was used to prepare the bimetal composites.No two-metal mixture layer was observed at the interface.On the contrary,a metallurgy interface was found,which provides high working security.A product rate of 95% was achieved by this special casting process.The service life is 50% higher than that of the commercial products.
Journal Article•
TL;DR: In this article, the authors presented technology of bimetallic layered castings based on the founding method of layer coating directly in cast process so-called method of mold cavity preparation.
Abstract: In paper is presented technology of bimetallic layered castings based on founding method of layer coating directly in cast process so-called method of mould cavity preparation. Prepared castings consist two fundamental parts i.e. bearing part and working part (layer). The bearing part of bimetallic layered casting is typical foundry material i.e. ferritic-pearlitic carbon cast steel, whereas working part (layer) is plate of austenitic alloy steel sort X10CrNi 18-8. The ratio of thickness between bearing and working part is 8:1. The quality of the bimetallic layered castings was evaluated on the basis of ultrasonic NDT (non-destructive testing), structure and macro- and microhardness researches.
27 Jan 2011
TL;DR: In this paper, a comparative investigation on TiN and TiAlN coatings deposited on a PM HSS milling cutter used for machining bimetal (M42+D6A) steel strips is presented.
Abstract: Titanium Nitride (TiN) coating deposited by Physical Vapour Deposition (PVD) or Chemical Vapour Deposition (CVD) techniques on cutting tools (single point or multipoint) has contributed towards the improvement of tool life, productivity and product quality [1]. Addition of Al in TiN coating (e.g., TiAlN or AlTiN) has further improved the coating properties required for machining applications [2, 3]. This work presents a comparative investigation on TiN and TiAlN coatings deposited on to a Powder Metallurgy High Speed Steel (PM HSS) milling cutter used for machining bimetal (M42+D6A) steel strips. PVD (Arc evaporation) technique was used to deposit the coatings after carefully preparing the cutting edges of the milling cutter. Microstructure, chemical composition, hardness and adhesion of the coatings have been characterised using different techniques. The incorporation of Al into TiN coating results in an improvement in hardness, wear resistance and cutting performance. Examination of the worn flank in the coated cutting edges revealed that abrasive and adhesive wear are the predominant failure mechanisms. Tool designers, coating suppliers and manufacturing engineers could benefit from the information provided.
Patent•
26 Jan 2011
TL;DR: In this paper, a bimetal compound metallurgical wedge hob is constructed using a centrifugal casting process, which sequentially comprises the steps of molding, shell modification, spraying, mold shell assembling, molten steel smelting, deoxidization and slag removing, pouring, heat preservation and coring, blasting and sand removal, processing and finishing, heat treatment and the like.
Abstract: The invention relates to a centrifugal casting process for the shell of a bimetal compound metallurgical wedge hob, which sequentially comprises the steps of moulding, shell modification, spraying, mold shell assembling, molten steel smelting, deoxidization and slag removing, pouring, heat preservation and coring, blasting and sand removal, processing and finishing, heat treatment and the like. The wedge hob produced through the process above not only has the advantages of high hardness, good abrasion-resistance and the like, but also has good comprehensive mechanical properties such as stiffness, toughness and the like, thereby satisfying the requirements for strength and wear resistance of cutter teeth of the wedge hob, ensuring the manufacturability of the hob body, improving the service time of the cutter teeth of the wedge hob, and reducing the production cost.
Patent•
18 May 2011
TL;DR: In this article, a bimetal sliding bearing with the sealing function and a preparation method is described, which consists of a seamless steel sleeve, a self-lubricating bimetaling bearing and sealing parts, wherein the sealing parts are made of polymer composite material.
Abstract: The invention discloses a bimetal sliding bearing with the sealing function and a preparation method thereof The bimetal sliding bearing comprises a seamless steel sleeve, a self-lubricating bimetal bearing and sealing parts, wherein the sealing parts are made of polymer composite material, the self-lubricating bimetal bearing is sintered on the inner wall of the seamless steel sleeve, sealing grooves are arranged on the seamless steel sleeve and at the two ends of the self-lubricating bimetal bearing, and the sealing parts are arranged inside the sealing grooves The bimetal sliding bearingnot only can effectively prevent lubricating agent from being leaked outside from the bearing, avoids a great deal of micro-particles entering the bearing and effectively prolongs the service life ofthe bearing, but also has excellent self-lubricating property and sealing performance