Microstructure and properties of diamond/SiC composites prepared by tape-casting and chemical vapor infiltration process

Liu, Yongsheng; Hu, Chenghao; Feng, Wei; Men, Jing; Cheng, Laifei; Zhang, Litong

doi:10.1016/j.jeurceramsoc.2014.05.042

Cited by 48 publications

(14 citation statements)

References 30 publications

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“…If the volume fraction of particles is fixed, it is easy to prove that the thermal conductivity of the composite is a monotonically increasing function of ܽ • ݄. Theoretically, the interfacial thermal conductance between matrix and second phase particles is related to the density and phonon velocity of the two materials [28]. Therefore, the interfacial thermal conductance between UO 2 and diamond is assumed to be a constant.…”

Section: Thermal Conductivitymentioning

confidence: 99%

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Spark plasma sintering of diamond-reinforced uranium dioxide composite fuel pellets

Chen

Subhash

Tulenko

2015

Nuclear Engineering and Design

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Section: Thermal Conductivitymentioning

confidence: 99%

“…Young's Modulus (GPa) diamond particle size (µm) Gatt et al,[28], 97.3% TD Padel and Novion., [29], 95.9%TD 93.8%TD Fig.10. Young's modulus of UO 2 -diamond composites as a function of mean particle size of diamond.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Spark plasma sintering of diamond-reinforced uranium dioxide composite fuel pellets

Chen

Subhash

Tulenko

2015

Nuclear Engineering and Design

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“…The material consists of diamond and silicon carbide (SiC) crystals with complex spatial and size distributions of grains. Representative microstructures and processing routes for this material system can be found in [ 10 , 11 , 12 , 13 , 14 , 15 ]. In the material studied herein, disparities exist in typical grain sizes among the primary (diamond) and secondary (SiC) phases, with diamond grains tending to be at least an order of magnitude larger, with mean sizes in tens of microns.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Scale Approach for Phase Field Modeling of Ultra-Hard Ceramic Composites

et al. 2021

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Diamond-silicon carbide (SiC) polycrystalline composite blends are studied using a computational approach combining molecular dynamics (MD) simulations for obtaining grain boundary (GB) fracture properties and phase field mechanics for capturing polycrystalline deformation and failure. An authentic microstructure, reconstructed from experimental lattice diffraction data with locally refined discretization in GB regions, is used to probe effects of local heterogeneities on material response in phase field simulations. The nominal microstructure consists of larger diamond and SiC (cubic polytype) grains, a matrix of smaller diamond grains and nanocrystalline SiC, and GB layers encasing the larger grains. These layers may consist of nanocrystalline SiC, diamond, or graphite, where volume fractions of each phase are varied within physically reasonable limits in parametric studies. Distributions of fracture energies from MD tension simulations are used in the phase field energy functional for SiC-SiC and SiC-diamond interfaces, where grain boundary geometries are obtained from statistical analysis of lattice orientation data on the real microstructure. An elastic homogenization method is used to account for distributions of second-phase graphitic inclusions as well as initial voids too small to be resolved individually in the continuum field discretization. In phase field simulations, SiC single crystals may twin, and all phases may fracture. The results of MD calculations show mean strengths of diamond-SiC interfaces are much lower than those of SiC-SiC GBs. In phase field simulations, effects on peak aggregate stress and ductility from different GB fracture energy realizations with the same mean fracture energy and from different random microstructure orientations are modest. Results of phase field simulations show unconfined compressive strength is compromised by diamond-SiC GBs, graphitic layers, graphitic inclusions, and initial porosity. Explored ranges of porosity and graphite fraction are informed by physical observations and constrained by accuracy limits of elastic homogenization. Modest reductions in strength and energy absorption are witnessed for microstructures with 4% porosity or 4% graphite distributed uniformly among intergranular matrix regions. Further reductions are much more severe when porosity is increased to 8% relative to when graphite is increased to 8%.

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“…In the past few decades, diamond particles have been applied as effective thermal fillers and reinforcement phases for ceramics and metal matrix materials due to their high strength and excellent thermal conductivity. The thermal conductivity and flexural strength of SiC ceramics can be obviously improved by introducing diamond particles . Diamond‐modified Cu and Cu alloy composites also exhibit enhanced thermal conductivity and are regarded as promising thermal management materials .…”

Section: Introductionmentioning

confidence: 99%

Improved Thermal Conductivity and Ablation Resistance of Microdiamond‐Modified C/C Composites after Diamond Graphitization

et al. 2019

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C/C composites with diamond addition are prepared, and a 1600 °C heat treatment is conducted to investigate the effects of diamond graphitization on the ablation resistance and thermal conductivity of the composites. With diamond content increasing, a higher degree of stress graphitization occurs to the surrounding pyrolytic carbon (PyC) due to the enhanced stress accumulation in the diamond stacking region during graphitization process. After heat treatment at 1600 °C, the single diamond/PyC interface is substituted by complex diamond/graphite and graphite/PyC interfaces which results in a more compact structure and enhanced interface strength. Benefiting from the optimized interface microstructure and reduced closed pores after diamond graphitization, higher thermal conductivities are achieved for C/C–diamond composites. The ablation performance of the composites is improved due to the better oxidation resistance of diamond particles, increased compactness of diamond stacking region, and optimized thermal properties of the composites.

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Microstructure and properties of diamond/SiC composites prepared by tape-casting and chemical vapor infiltration process

Cited by 48 publications

References 30 publications

Spark plasma sintering of diamond-reinforced uranium dioxide composite fuel pellets

Spark plasma sintering of diamond-reinforced uranium dioxide composite fuel pellets

A Multi-Scale Approach for Phase Field Modeling of Ultra-Hard Ceramic Composites

Improved Thermal Conductivity and Ablation Resistance of Microdiamond‐Modified C/C Composites after Diamond Graphitization

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