三元碳化物Al4SiC4对无压烧结β-SiC的影响
Effects of Ternary Carbide of Al4SiC4 on Pressureless Sintering of β-SiC
摘 要
采用物相分析、相对密度测试及显微形貌观察等研究了不同烧结温度下三元碳化物Al4SiC4作为烧结助剂对无压烧结β-SiC的物相组成、相对密度及显微结构的影响.结果表明:在烧结过程中,Al4SiC4在高温下会分解生成铝,铝原子进入β-SiC晶格中促进了β-SiC向α-SiC的转变;而随着烧结温度的升高,烧结体的相对密度增大;随Al4SiC4加入量的增多,烧结体的密度先升后降;在1 900 ℃下,Al4SiC4的加入量为5%(质量分数)时,烧结体的相对密度最大,结构最致密.
SiC
无压烧结
晶型转变
Al4SiC4
SiC
pressureless sintering
crystal transformation
Abstract
Phase analysis,relative density testing and microstructure observation were used to study the effects of ternary carbide of Al4SiC4 as a sintering aid on pressureless sintering of β-SiC at different sintering temperatures.The results show that Al4SiC4 decomposed and produced Al during sintering process at high temperature.Al atoms entered into β-SiC crystal lattice,which could promote the transformation of β-SiC to α-SiC.With the increase of sintering temperature,the relative density of sintered samples increased.With the increase of Al4SiC4 amount,the relative density of sintered samples first increased then decreased.The sintered sample had a most compact structure with maximum relative density when the amount of Al4SiC4 was 5wt% and sintering temperature was 1 900 ℃.
中图分类号 TG175.7
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(51274156);湖北省自然科学基金资助项目(2012FFB04902)
收稿日期 2013/12/16
修改稿日期 2014/11/21
网络出版日期
作者单位点击查看
备注周诗民(1992-),男,湖北潜江人,硕士研究生.
引用该论文: ZHOU Shi-min,YU Chao,ZHU Hong-xi,YUAN Wen-jie,DENG Cheng-ji,BAI Chen. Effects of Ternary Carbide of Al4SiC4 on Pressureless Sintering of β-SiC[J]. Materials for mechancial engineering, 2015, 39(2): 45～49
周诗民,余超,祝洪喜,员文杰,邓承继,白晨. 三元碳化物Al4SiC4对无压烧结β-SiC的影响[J]. 机械工程材料, 2015, 39(2): 45～49
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