Microstructure, mechanical properties and thermal shock behavior of h-BN–AlN ceramic composites prepared by combustion synthesis
Microstructure, mechanical properties and thermal shock behavior of h-BN–AlN ceramic composites prepared by combustion synthesis
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DOI：
10.1016/j.jallcom.2010.06.069
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发表时间：
2011-02
影响因子：
6.2
通讯作者：
Hongbo Li;Yongting Zheng;Jiecai Han;L. Zhou
中科院分区：
文献类型：
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作者：
Hongbo Li;Yongting Zheng;Jiecai Han;L. Zhou
以B_4C、Si、Al和TiN为原料，在100MPa氮气压力下，采用燃烧合成法制备了AlN-TiN体积分数为20%~70%的h-BN-SiC-AlN-TiN陶瓷复合材料。AlN-TiN体积分数对复合材料的显微组织、力学性能和抗热震性能有显著影响。随着AlN-TiN体积含量的增加，复合材料的力学性能显著提高，但抗热震性下降。热震试验表明，当AlN-TiN含量为30vol%时，复合材料的临界热震温度（Δ T）高于1200 ° C，而当AlN-TiN含量为50vol%和70vol%时，复合材料的临界热震温度（Δ T）分别降至850和670 ° C。
h-BN–SiC–AlN–TiN ceramic composites with volume content of AlN–TiN ranging from 20% to 70% were prepared by combustion synthesis from powder compacts of B4C, Si, Al and TiN under 100MPa nitrogen pressure. The volume fraction of AlN–TiN was found to have a significant influence on the microstructure, mechanical properties and thermal shock resistance of the composites. With the increasing volume content of AlN–TiN, the mechanical properties of the composites were improved remarkably, while thermal shock resistance decreased. Thermal shock tests showed that the critical thermal shock temperature (ΔT) was higher than 1200°C for the composites with AlN–TiN contents of 30vol%; while it was decreased to 850 and 670°C for the composites with AlN–TiN contents of 50 and 70vol%, respectively.