Mechanical properties and thermal shock resistance of Si2BC3N ceramics with ternary Al4SiC4 additive
Mechanical properties and thermal shock resistance of Si2BC3N ceramics with ternary Al4SiC4 additive
复制标题
三元Al4SiC4添加剂Si2BC3N陶瓷的力学性能和抗热震性能
DOI：
10.1016/j.ceramint.2018.02.103
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发表时间：
2018-02
影响因子：
5.2
通讯作者：
Li Yawei
中科院分区：
文献类型：
--
作者：
Liao Ning;Jia Dechang;Yang Zhihua;Zhou Yu;Li Yawei
采用机械合金化法制备了Si_2BC_3N和Al_4SiC_4非晶粉末，通过SPS烧结制备了致密的Si_2BC_3N陶瓷。研究了复合材料的相组成、显微组织、力学性能和抗热震性能。此外，还进行了氧化和耐烧蚀性的评价。结果表明，在1200和1400 °C下无压烧结时，可检测到Al4SiC4相。而Al_4SiC_4在较高温度下分解为AlN和SiC相。对于块体Si_2BC_3N陶瓷，Al_4SiC_4的加入诱导了乱层BN（C）片的形成，从而提高了陶瓷的致密度。此外，Al_4SiC_4片镶嵌在陶瓷基体中。因此，添加剂的加入明显提高了复合材料的力学性能和抗热震性能。同时，由于其较高的相对密度，含添加剂的复合材料具有比原始Si2BC3N陶瓷更上级的耐烧蚀性。
Dense Si2BC3N ceramics were prepared through SPS sintering the amorphous Si2BC3N and Al4SiC4powders obtained from mechanical alloying. The phase compositions, microstructures, and mechanical properties, as well as the thermal shock resistance were investigated. In addition, evaluations of oxidation and the ablation resistance were also preceded. The results show that Al4SiC4phase can be detected at 1200 and 1400 °C under pressureless sintering. However, Al4SiC4can be decomposed to AlN and SiC phases under higher temperatures. As for the bulk Si2BC3N ceramics, the Al4SiC4additive induce the development of turbostratic BN(C) plates and improve the relative density consequently. Besides, the Al4SiC4plates are embedded in the matrix of ceramics. Therefore, the mechanical properties and thermal shock resistance are improved apparently with the addition of additive. Meanwhile, the additive containing composites have superior ablation resistance than the pristine Si2BC3N ceramics due to their higher relative density.
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