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In-situ Combustion Synthesis of h-BN-SiC High-temperature Ceramics

机译：h-BN-SiC高温陶瓷的原位燃烧合成

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摘要

The feasibility of fabricating h-BN-SiC high-temperature ceramics by in-situ combustion synthesis was demonstrated by igniting the mixture of boron carbide and silicon powder under 100MPa nitrogen pressure. The reaction thermodynamics and the adiabatic combustion temperature were calculated theoretically. The phase composition, microstructure and mechanical properties of composite were identified by XRD and SEM. The maximum bending strength and fracture toughness of the composite were 65.2 MPa and 1.4 MPa·m~(1/2) under room temperature, respectively. The effects of h-BN and SiC dilution contents on the mechanical properties of composite were also discussed.
机译：通过在100MPa的氮气压力下点燃碳化硼和硅粉的混合物，证明了通过原位燃烧合成制备h-BN-SiC高温陶瓷的可行性。从理论上计算了反应热力学和绝热燃烧温度。用XRD和SEM对复合材料的相组成，显微组织和力学性能进行了鉴定。在室温下，复合材料的最大弯曲强度和断裂韧性分别为65.2 MPa和1.4 MPa·m〜（1/2）。还讨论了h-BN和SiC稀释含量对复合材料力学性能的影响。

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