Showing papers on "Ceramic matrix composite published in 2014"
TL;DR: Besides the excellent high-temperature mechanical properties, Si3N4 and SiC based ceramics containing insulating or electrically conductive phase are attractive for their tunable dielectric propert...
Abstract: Besides the excellent high-temperature mechanical properties, Si3N4 and SiC based ceramics containing insulating or electrically conductive phase are attractive for their tunable dielectric propert...
466 citations
TL;DR: In this article, a wide-ranging overview on the state of the dispersion of graphene in composites, including materials already synthesized and characterization, is given, focusing on different dispersion methods, mechanism of strengthening, composites synthesized using graphene and its applications.
191 citations
Book•
27 Oct 2014
TL;DR: In this article, the authors present a detailed review of ceramic matrix composites materials modeling and technology, including 3-d woven ceramic matrix composite technology for modeling and analysis of a composite of a ceramic matrix with ceramic matrix, and an integrated materials and mechanics support services for ceramic fiber-ceramic matrix composite modeling.
Abstract: ceramic matrix composites materials modeling and technology click here to access this book : free download http://www ceramic matrix composites download.e-bookshelf part iv modeling researchgate ceramic matrix composites buch ceramic matrix composites materials modeling and ceramic matrix composites materials modeling and international journal of materials product technology modeling 3-d woven ceramic matrix composites evaluation of ceramic matrix composite technology for modeling and analysis of a ceramic matrix composites with ceramic matrix composites: combined materials and chapter 15 advanced functional materials: modeling ceramic matrix compositesadvanced high-temperature ceramic matrix composites second edition rakf stochastic virtual tests for high-temperature ceramic environmental barrier coatings for sic ceramic matrix ceramic composites: integrated materials and mechanics support services for ceramic fiber-ceramic matrix composites modeling the evolution of mesoscale morphology in c/sic new structural materials technologies: opportunities for technical meeting and exhibition ms t 17 matscitech international conference and exposition on advanced design for additive manufacturing of composite materials ceramic matrix composites iccm-central ceramic matrix composites second edition dofn section
119 citations
TL;DR: In this paper, the development of CVD SiC fibers and three generations of polymer derived SiC fiber over the past 50 years are discussed, illustrating the effect of fiber precursor and processing on the microstructure and physical properties of the non-oxide ceramic fibers.
Abstract: Non-oxide ceramic fibers are of considerable interest due to the ability to combine the high performance, especially high temperature thermal and creep resistance, with the structural advantages of fibers including their use as reinforcements for metal (MMCs) and ceramic matrix composites (CMCs). In this paper the development of CVD SiC fibers and three generations of polymer derived SiC fibers over the past 50 years are discussed, illustrating the effect of fiber precursor and processing on the microstructure and physical properties of the non-oxide ceramic fibers. Additionally recent advances in research and development related to fibers from SiC and SiCN systems are presented with discussion of the current focus on reducing the costs of the fiber processing, while increasing their thermostructural stability.
110 citations
TL;DR: In this article, a three-phase composites with excellent electromagnetic wave absorption properties based on carbon black (CB) and BaTiO3 (BT) nanoparticles embedded into polyvinylidene fluoride (PVDF) were prepared using a simple blending and hot-moulding technique.
Abstract: Novel three-phase composites with excellent electromagnetic wave absorption properties based on carbon black (CB) and BaTiO3 (BT) nanoparticles embedded into polyvinylidene fluoride (PVDF) were prepared using a simple blending and hot-moulding technique. When the composites have filler contents of CB 10 wt% and BT 5 wt%, the reflection loss can reach −38.8 dB at 9.2 GHz, and the reflection loss is less than −10 dB in the frequency range from 3.5 to 18.0 GHz with an absorber thickness of 1.5–5.0 mm. Compared to the two-phase composites of CB/PVDF and BT/PVDF, the three-phase composites showed superior absorption properties. The Debye relaxation theory was used to explain the enhanced absorption properties.
89 citations
TL;DR: In this paper, the authors addressed the feasibility issues facing the application of SiC-matrix microenculated fuels for light water reactor application and found that the SiC matrix was quite stable with behavior similar to that of CVD SiC.
84 citations
TL;DR: In this article, the dielectric and electromagnetic absorbing properties of polymer derived siliconboron carbonitride ceramics (PDCs-SiBCN) with multi-walled carbon nanotubes were investigated.
Abstract: Polymer derived siliconboron carbonitride ceramics (PDCs-SiBCN) containing multi-walled carbon nanotubes (MWCNTs-SiBCN) were fabricated and heat treated at 1350 °C and 1500 °C in nitrogen atmosphere. XRD patterns show the characteristic peaks of SiC appeared in MWCNTs-SiBCN treated at 1500 °C, which is 300 °C lower than the crystallization temperature of SiC in PDCs-SiBCN. The decrease of temperature can be ascribed to the heterogeneous nucleation promoted by MWCNTs as nucleating agent. Energy change during heterogeneous nucleation is analyzed to explain the acceleration of crystallization. The dielectric and electromagnetic (EM) absorbing properties of the as-prepared MWCNTs-SiBCN are investigated, which show a better wave-absorbing ability than PDCs-SiBCN treated at the same temperature, owing to a distinctive A + B + C microstructure in MWCNTs-SiBCN. This work makes it possible to fabricate the PDCs-SiBCN with good EM absorbing property at a lower temperature, granting them potential as a matrix material candidate in ceramic matrix composite field.
79 citations
TL;DR: In this article, the uniaxial tensile behavior of unidirectional C/SiC ceramic-matrix composites at room temperature has been investigated and an approach to predicting the tensile stress-strain curve was developed.
Abstract: The uniaxial tensile behavior of unidirectional C/SiC ceramic-matrix composites at room temperature has been investigated. An approach to predicting the uniaxial tensile stress–strain curve of the unidirectional ceramicmatrix composites is developed. The Budiansky–Hutchinson–Evans shear lag model is used to describe the microstress field of damaged composites. A statistical matrix cracking model, a fracture mechanics interface debonding criterion, and a statistical fiber failure model are used to determine the spacing of matrix cracks, the debonded length of interface, and the volume fraction of failed fibers. By combining the shear lag model and the three damage models, the stress–strain curve at each damage stage is constructed and an exact method for predicting the toughness and strength of the composites is established. The tensile stress–strain curves predicted by the present analysis agree well with experimental data.
73 citations
TL;DR: In this paper, a carbon fiber reinforced SiC (Cf/SiC) composite was joined to TC4 alloy using W mixed powders as composite filler material at proper process parameters.
70 citations
TL;DR: In this paper, the porosities of the C/C-SiC composites were about 0.89-2.8 vol%, which is denser than traditional C/Cs composites, and three annular regions were present on the ablation surface.
Abstract: C/C-SiC composites were prepared by molten infiltration of silicon powders, using porous C/C composites as frameworks. The porosities of the C/C-SiC composites were about 0.89-2.8 vol%, which is denser than traditional C/C composites. The ablation properties were tested using an oxyacetylene torch. Three annular regions were present on the ablation surface. With increasing pyrocarbon fraction, a white ceramic oxide layer formed from the boundary to the center of the surface. The ablation experimental results also showed that the linear and mass ablation rates of the composites decreased with increasing carbon fraction. Linear SiO2 whiskers of diameter 800 am and length approximately 3 mu m were formed near the boundaries of the ablation surfaces of the C/C-SiC composites produced with low-porosity C/C frameworks. The ablation mechanism of the C/C-SiC composites is discussed, based on a heterogeneous ablation reaction model and a supersaturation assumption. (C) 2013 Elsevier Ltd. All rights reserved.
68 citations
TL;DR: In this paper, the authors show that the toughening level observed in two ceramic matrix composites with different graphene type fillers is reasonably fitted to the well-known model for reinforcement of ceramic composites by whiskers/fibers.
TL;DR: In this paper, the authors compared the mechanical and tribological properties of ceramic-matrix friction material (CMFM) with steel fiber (SF), mullite fiber (MF), and mixing SF and MF.
TL;DR: The behavior of carbon/silicon carbide composites at very high temperatures is investigated in an inductively-coupled plasma generator that simulates atmospheric re-entry aerothermal conditions for space vehicles as discussed by the authors.
Patent•
30 Jun 2014TL;DR: In this paper, a high-energy beam is used to fuse a single powder of particles that present sphericity lying in the range 0.8 to 1.0 and of form factor lying in range 1 to √2.
Abstract: A method of fabricating parts out of metallic, intermetallic, ceramic, ceramic matrix composite, or metal matrix composite material with discontinuous reinforcement, includes melting or sintering powder particles by means of a high-energy beam. The powder used is a single powder of particles that present sphericity lying in the range 0.8 to 1.0 and of form factor lying in the range 1 to √2, each powder particle presenting substantially identical mean composition, and the grain size distribution of the particles of the powder is narrowed around the mean diameter value d50% in such a manner that: (d90%−d50%)/d50%≦0.66; and (d50%−d10%)/d50%≦0.33; with a “span”: (d90%−d10%)/d50%≦1.00.
TL;DR: Inspired by the structure of the bird's nest, a new fibrous ceramics with mullite fibers as the matrix and SiO 2 -B 2 O 3 phase as the high-temperature binder was designed and synthesized.
TL;DR: In this article, a selective laser sintering (SLS) combined with cold isostatic pressing (CIP) process was used to consolidate Al 2 O 3 powder with additive of epoxy resin E06 (ER06) and polyvinyl alcohol (PVA).
Book•
01 Jan 2014
TL;DR: In this article, the authors present an overview of the development of ceramic matrix composites and their application in various types and applications, including hot-pressing and hot-isostatic pressing.
Abstract: Advances in ceramic matrix composites: Introduction. Part 1 Types and processing: Processing, properties and applications of ceramic matrix composites, SiCf/SiC: An overview Nanoceramic matrix composites: Types, processing and applications Silicon carbide-containing alumina nanocomposites: Processing and properties Advances in manufacture of ceramic matrix composites by infiltration techniques Manufacture of graded ceramic matrix composites using infiltration techniques Heat treatments to strengthen silicon carbide ceramic matrix composites Developments in hot-pressing (HP) and hot isostatic pressing (HIP) of ceramic matrix composites Hot pressing of tungsten carbide ceramic matrix composites Strengthening of alumina ceramic matrix nanocomposites using spark plasma sintering Cold ceramics: Low-temperature processing of ceramics for applications in composites. Part 2 Properties: Understanding interfaces and mechanical properties of ceramic matrix composites Using finite element analysis (FEA) to understand the mechanical properties of ceramic matrix composites Understanding wear and tribological properties of ceramic matrix composites Understanding and improving the thermal stability of layered ternary carbides in ceramic matrix composites Advances in self-healing ceramic matrix composites Self crack-healing behaviour in ceramic matrix composites. Part 3 Applications: Geopolymer (aluminosilicate) composites: Synthesis, properties and applications Fibre-reinforced geopolymer composites (FRGC) for structural applications The use of ceramic matrix composites in nuclear and fusion energy applications Ceramic matrix composite thermal barrier coatings for turbine parts The use of ceramic matrix composites for metal cutting applications Cubic boron nitride-containing ceramic matrix composites for cutting tools Multilayer glass-ceramic composites for microelectronics: Processing and properties Fabricating functionally-graded ceramic micro-components using soft lithography Ceramics in restorative dentistry Resin-based ceramic matrix composite materials in dentistry The use of nano-boron nitride reinforcements in composites for packaging applications.
TL;DR: In this paper, a Si3N4-graphene composites were manufactured using the hot-pressing method, where the graphene phase was added to the silicon nitride phase in a quantity of up to 10 mass%, and the materials were sintered under uniaxial pressure.
Abstract: This study concerns new Si3N4–graphene composites manufactured using the hot-pressing method. Because of future applications of silicon nitride for cutting tools or specific parts of various devices having contact with high temperatures there is a need to find a ceramic composite material with good mechanical and especially thermal properties. Excellent thermal properties in the major directions are characteristic of graphene. In this study, the graphene phase is added to the silicon nitride phase in a quantity of up to 10 mass%, and the materials are sintered under uniaxial pressure. The mixture of AlN and Y2O3 is added as sintering activator to the composite matrix. The studies focus on thermal stability of produced composites in argon and air conditions up to the temperature of 1,000 °C. The research also concerns the influence of applied uniaxial pressure during the sintering process on the orientation of graphene nanoparticles in the Si3N4 matrix. The study also presents research on anisotropy of thermal diffusivity and following thermal conductivity of ceramic matrix composites versus the increasing graphene quantity. Most of the presented results have not been published in the literature yet.
TL;DR: In this paper, a thermoplastic polyurethane (PU) elastomer, prepared from poly(tetramethylene glycol) and methyl diphenyl diisocyanate, was blended with boron nitride (BN) to fabricate a thermally conductive interface material.
Abstract: Thermoplastic polyurethane (PU) elastomer, prepared from poly(tetramethylene glycol) and methyl diphenyl diisocyanate, was blended with boron nitride (BN) to fabricate a thermally conductive interface material. BN treated by a silane coupling agent (BN―NH2) and PU-grafted BN were prepared to fabricate a composite that has better thermal conductivity and mechanical strength. The surface-modified filler showed enhanced dispersibility and affinity because of the surface treatment with functional groups that affected the surface free energy, along with the structural similarity of the doped crystallized diisocyanate molecule with the matrix. The thermal conductivity increased from 0.349 to 0.467 W mk−1 on 20 wt% PU-grafted BN loading that is a 1.34-fold higher value than in the case of pristine BN loading at the same weight fraction. Moreover, the number of BN particles acting as defects, thereby reducing the mechanical strength, is decreased because of strong adhesion. We can conclude that these composite materials may be promising materials for a significant performance improvement in terms of both the thermal and mechanical properties of PU-based polymers. Copyright © 2014 John Wiley & Sons, Ltd.
TL;DR: In this paper, the microwave absorbing properties of lithium aluminum silicate (LAS) and LAS-SiC double layer composite absorbers were investigated within the frequency range of 8.2-12.4 GHz at 300-500°C.
TL;DR: In this paper, the nano-structured YSZ+Al2O3 composite coating had higher oxidation and hot corrosion resistance than those of the conventional ySZ coating and the microstructural analysis indicated that the growth of TGO was much less for this nanostructured composite coating while it reduced infiltration of both oxygen and aggressive molten salt.
TL;DR: Graphene may have great potential as the reinforced phase in bioceramics by virtue of its extraordinary mechanical properties and intrinsic biocompatibility as discussed by the authors, but it suffers from poor mechanical properties.
Abstract: Graphene may have great potential as the reinforced phase in bioceramics by virtue of its extraordinary mechanical properties and intrinsic biocompatibility. Calcium silicate (CaSiO3) bioceramics have been proposed as promising biomaterials but suffer from poor mechanical properties. In this study we report for the first time the use of graphene to improve the strength and toughness of CaSiO3 bioceramics for bone scaffolds. Graphene–CaSiO3 composite scaffolds were fabricated via selective laser sintering technology, in which the sintering time was reduced to seconds or even microseconds through the rapid heating and cooling process of a laser. The fracture morphology, chemical composition and mechanical properties of the composite scaffolds were investigated and analyzed. The results showed that graphene was octopus-like with tall and straight tentacles embedded in the bioceramic matrix, indicating a toughening mechanism of pull-out. The remaining graphene in the composite scaffolds increased logarithmically with the graphene addition. The strength and toughness firstly increased with graphene content (0–0.5 wt% in this study) which was attributed to the load transfer from the ceramic matrix to graphene when fractured, while they decreased as the graphene content further increased to 1.0 or above due to the occurrence of graphene agglomeration and holes induced by excessive graphene. There were optimal improvements of fracture toughness by 46% and compressive strength by 142%.
TL;DR: In this paper, an approach to model fatigue hysteresis loops of unidirectional C/SiC composites considering fiber failure has been developed, based on the damage mechanism of fiber slipping relative to matrix under fatigue loading, the unloading interface counter-slip length and reloading interface new slip length are determined by fracture mechanics approach.
Abstract: In this paper, the fatigue hysteresis behavior of unidirectional C/SiC ceramic–matrix composite at room and elevated temperatures in air atmosphere has been investigated. The fatigue hysteresis modulus and fatigue hysteresis loss energy corresponding to different cycles have been analyzed. An approach to model fatigue hysteresis loops of unidirectional ceramic composites considering fiber failure has been developed. Based on the damage mechanism of fiber slipping relative to matrix under fatigue loading, the unloading interface counter-slip length and reloading interface new slip length are determined by fracture mechanics approach. The interface shear stress and broken fibers fraction corresponding to different cycles are obtained through comparing the experimental fatigue hysteresis loss energy with theoretical computational value considering fiber failure. The fatigue hysteresis loops of unidirectional C/SiC composite have been predicted for different number of cycles.
TL;DR: In this paper, two liquid silicon infiltrated SiCf reinforced SiC composites were tensile tested with electrical resistance (ER) monitoring as well as acoustic emission to quantify matrix cracking.
Abstract: The implementation of Ceramic Matrix Composites necessitates the understanding of stress-dependent damage evolution. Toward this goal, two liquid silicon infiltrated SiCf reinforced SiC composites were tensile tested with electrical resistance (ER) monitoring as well as acoustic emission to quantify matrix cracking. ER was modeled using a combination of resistors in series and parallel to model transverse matrix cracks and fiber/matrix segments between matrix cracks. It is shown that resistance change is sensitive to transverse matrix crack formation and stress-dependent debonding length. The model appears to be accurate up to the stress for matrix crack saturation.
TL;DR: In this article, a mixture of Li and Na carbonates (1:1 molar ratio) and Gd-doped ceria (excellent oxide-ion conductor) was used as a ceramic matrix to test the electrical properties of the composite.
TL;DR: In this paper, the authors performed micro-structural and mechanical characterizations on the materials, which revealed that the size of the carbonitride ceramic particle was significantly reduced when the Ta content was increased, which was attributed to the presence of intermetallic compounds in the binder phase.
TL;DR: In this article, a C/SiC oxidation resistance coating was prepared on carbon/carbon composites by slurry and pack cementation, and the microstructure, oxidation resistance and mechanical properties of C/C coating prepared from 1773 to 2573 K were investigated.
TL;DR: In this paper, the effect of matrix cracking on hysteresis behavior of cross-ply ceramic matrix composites is investigated, where the cracking of crossply ceramic composites was classified into five modes, where cracking mode 3 and mode 5 involve matrix cracking and fiber/matrix interface debonding in 0° ply.
Abstract: The effect of matrix cracking on hysteresis behavior of cross-ply ceramic matrix composites is investigated in the present analysis. The cracking of cross-ply ceramic composites was classified into five modes, where cracking mode 3 and mode 5 involve matrix cracking and fiber/matrix interface debonding in 0° ply. The matrix crack space and interface debonded length are obtained by matrix statistical cracking model and fracture mechanics interface debonding criterion. Based on the damage mechanisms of fiber sliding relative to matrix in the interface debonded region, the unloading interface reverse slip length and reloading interface new slip length of cracking mode 3 and mode 5 are determined by the fracture mechanics approach. The hysteresis loops of four different cases for cracking mode 3 and mode 5 are derived respectively. The hysteresis loss energy as a function of interface shear stress of mode 3 and mode 5 are analyzed. The theoretical results have been compared with experimental data of two diffe...
TL;DR: In this paper, C/SiC-ZrB 2 composites prepared via precursor infiltration and pyrolysis (PIP) were treated at high temperatures ranging from 1200°C to 1800°C, and the flexural properties of the composites increased initially and then decreased reversely.