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硅酸盐通报 ›› 2010, Vol. 29 ›› Issue (1): 239-242.

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刚玉-氮化硅-碳化硅复合材料的性能研究

陈春霞;李勇;康华荣;夏文斌;岳月红   

  1. 北京科技大学材料科学与工程学院,北京,100083;巩义通达中原耐火材料技术有限公司,巩义,451261
  • 出版日期:2010-02-15 发布日期:2021-01-18

Research on the Properties of Al_2O_3-Si_3N_4-SiC Composite

CHEN Chun-xia;LI Yong;KANG Hua-rong;XIA Wen-bin;YUE Yue-hong   

  • Online:2010-02-15 Published:2021-01-18

摘要: 以棕刚玉、氮化硅和碳化硅为原料在氧化气氛下制成试样.将试样分别在1500 ℃、1550 ℃和1600 ℃保温5 h进行埋炭处理.利用XRD、SEM和EDS等检测方法,结合热力学分析,研究了氧化气氛烧成后试样的物相变化以及高温埋炭条件下Si_3N_4的稳定性.结果表明:氧化气氛烧成后生成一种莫来石固溶体Si_6Al_(10)O_(21)N_4;高温埋炭处理后Si_3N_4和Si_6Al_(10)O_(21)N_4会部分转化为SiC,Si_3N_4向SiC明显转化的温度大于1500 ℃,Si_6Al_(10)O_(21)N_4向SiC明显转化的温度大于1550 ℃.

关键词: Si_3N_4;SiC;相转化

Abstract: Taking brown alumina, silicon nitride and carbon silicon as raw materials, the specimens were prepared under oxidization atmosphere. The specimens was embedded in carbon at temperatures of 1500 ℃,1550 ℃ and 1600 ℃ for 5 h respectively. The phase change of the specimens fired under oxidation atmosphere and the stability of Si_3N_4 under carbon-embedded were studied by XRD, SEM and EDS, combining with thermodynamic analysis.The results show that there is a mullite solid solution Si_6Al_(10)O_(21)N_4 created after fired under oxidation atmosphere.Si_3N_4 and Si_6Al_(10)O_(21)N_4 will transform to SiC partly after carbon-embedded, and the transition temperature of Si_3N_4 and Si_6Al_(10)O_(21)N_4 are above 1500 ℃ and 1550 ℃ respectively.

Key words: Si_3N_4;SiC;phase transition

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