以电熔刚玉骨料和细粉为主要原料,引入5%～8%的Si粉,以纸浆废液为结合剂制备了Al_2O_3-Si材料.研究了Al_2O_3-Si材料埋碳加热(1000～1600 ℃)过程中物相组成和显微结构的变化.结果表明: 1200 ℃烧后,Si开始与CO反应生成晶须状SiC,且晶须相互交叉连锁.1300～1400 ℃烧后,SiC晶须生成量明显增加,且发育长大,形成交叉连锁的网络填充在刚玉骨架结构中.1400 ℃烧后试样中还出现少量O'-SiAlON晶体.1500～1600 ℃烧后,SiC晶体发育长大,呈枝杈状和弯曲状.1400～1500 ℃烧后残留Si已熔化,发生塑性变形,起助烧结作用.
The Al_2O_3-Si material has been prepared by using fused corundum aggregates and fines, 5%-8% Si powder as starting materials and sulfite lye as binder. Changes in phase composition and microstructure of Al_2O_3-Si material during heating at 1000-1600 ℃ under carbon embedded condition have been studied. The results show that after firing at 1200 ℃, Si begins to react with CO to form SiC whiskers which are interlocked with each other within the pores of the materials. After firing at 1300-1400 ℃, SiC whiskers are found to increase noticeably in amount together with growth in crystal size. The SiC whiskers are observed to be interspersed within the corundum skeleton structure mostly in the form of continuous interlocking network. Minor amount of O'-SiAlON crystals are observed at 1400 ℃. After firing at 1500-1600 ℃, SiC continues to grow in crystal size, most of them exhibit bending and arborization tendency. The residual Si is melt exhibiting plastic deformation and takes as sintering aid.
参考文献
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