Microstructure and mechanical properties of SiCf/SiBCN ceramic matrix composites
Microstructure and mechanical properties of SiCf/SiBCN ceramic matrix composites
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DOI：
10.1007/s40145-015-0128-2
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发表时间：
2015-01
影响因子：
16.9
通讯作者：
Jiaying Wang;Zhihua Yang;X. Duan;D. Jia;Yu Zhou
中科院分区：
文献类型：
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作者：
Jiaying Wang;Zhihua Yang;X. Duan;D. Jia;Yu Zhou
采用机械合金化方法制备了碳化硅纤维增强SiBCN陶瓷基复合材料，并用热压法制备了碳化硅纤维增强SiBCN陶瓷基复合材料。在烧结过程中，非晶态碳化硅纤维结晶严重，转变为β-碳化硅。同时，界面碳热反应导致了基体与纤维之间的紧密结合。结果表明，SiCf/SiBCN以典型的灾变方式断裂。当烧结温度为1900℃/60 MPa/30min时，CMC样品的室温力学性能达到最大值。材料的密度为2.56±0.02g/cm~3，弯曲强度为284.3±17.9 Mpa，杨氏模量为183.5±11.1 Gpa，断裂韧性为2.78±0.14 Mpa·m1/2。
SiC fiber reinforced SiBCN ceramic matrix composites (CMCs) have been prepared by mechanical alloying and consolidated by hot pressing. During the sintering process, amorphous SiC fibers crystallized seriously and transformed intoβ-SiC. Meanwhile, the interfacial carbothermal reactions caused the strong bonding between the matrix and fibers. As a result, SiCf/SiBCN fractured in a typical catastrophic manner. Room-temperature mechanical properties reached the maximums for the CMC samples sintered at 1900 °C/60 MPa/30 min. The density, flexural strength, Young’s modulus and fracture toughness are 2.56±0.02 g/cm3, 284.3±17.9 MPa, 183.5±11.1 GPa and 2.78±0.14 MPa·m1/2, respectively.