Microstructures and properties of SiB0.5C1.5N0.5 ceramics consolidated by mechanical alloying and hot pressing
Microstructures and properties of SiB0.5C1.5N0.5 ceramics consolidated by mechanical alloying and hot pressing
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DOI：
10.1016/j.msea.2007.12.010
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发表时间：
2008-08
期刊：
影响因子：
6.4
通讯作者：
Zhihua Yang;Yu Zhou;D. Jia;Q. Meng
中科院分区：
文献类型：
--
作者：
Zhihua Yang;Yu Zhou;D. Jia;Q. Meng
采用两种机械合金化方法制备了纳米SiB_（0.5）C_（1.5）N_（0.5）陶瓷，并采用热压烧结法进行了烧结。两种SiB_（0.5）C_（1.5）N_（0.5）陶瓷的主要相为纳米级的6 H-SiC、3C-SiC和BCN。一步球磨法制备的SiBCN陶瓷的6 H-SiC含量高于两步球磨法制备的SiBCN陶瓷。前者和后者的室温弯曲强度分别为312.8MPa和423.4MPa。在高温下，前者在1000°C和1400°C时的强度分别降低了8.2%和28.0%。后者的强度降低率分别为11.3%和38.5%。在1900°C下固结的两种SiBCN陶瓷的平均热膨胀系数约为4.5×10−6/°C。
Nanostructured SiB0.5C1.5N0.5ceramics were formed by two routes of mechanical alloying and consolidated by hot pressing. Nano-sized 6H-SiC, 3C-SiC and BCN were the main phases for two SiB0.5C1.5N0.5ceramics. For the SiBCN ceramics fabricated from the powders milled by one-step milling, the content of 6H-SiC is higher than that of ceramic fabricated from the powders milled by two-step milling. The flexural strengths for the former and latter were 312.8MPa and 423.4MPa at room temperature, respectively. At high temperature, the strengths of the former reduced 8.2% and 28.0% at 1000°C and 1400°C, respectively. The reduction rates of strengths for the latter were 11.3% and 38.5%, respectively. The average thermal expansion coefficients of two SiBCN ceramics consolidated at 1900°C were about 4.5×10−6/°C.