【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。更多还原

【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 ofβ-SiC at different sintering temperatures.The results show that Al4SiC4 decomposed and produced Al during sintering process at high temperature.Al atoms entered intoβ-SiC crystal lattice,which could promote the transformation ofβ-SiC toα-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 ℃.更多还原