Al_2O_3-SiC-SiAlON复合材料的制备和性能  

Preparation and Properties of Al_2O_3-SiC-SiAlON Composites

作　　者：刘新红[1] 周超杰[1] 张磊[1] 

机构地区：[1]郑州大学高温材料研究所,河南郑州450052

出　　处：《郑州大学学报（工学版）》2012年第1期46-50,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省重点科技攻关资助项目(112102210095);河南省教育厅自然科学基金资助项目(2008A430017;2011A430024)

摘　　要：以电熔白刚玉、α-Al2O3微粉、Si粉和矾土基β-SiAlON粉为原料,以树脂为结合剂,制备了复合材料试样.研究了1 500℃烧后试样的物相组成、显微结构以及常温物理性能、高温抗折强度和抗热震性.结果表明:(1)在刚玉中引入适量Si粉高温埋碳条件下可合成Al2O3-SiC-SiAlON复合材料,引入适量β-SiAlON可促进Si反应,且复合材料1 500℃烧结良好;(2)复合材料的高温抗折强度和抗热震性随Si粉加入量增加而提高,加入β-SiAlON后材料的高温机械性能进一步提高;(3)材料高温机械性能提高的原因在于Si粉在高温下与C、CO和N2反应生成晶须状或纤维状SiC和絮状O’-SiAlON填充气孔,形成交叉连锁的网络结构,对材料起增强和增韧作用.The composite specimens were prepared using fused corundum,micro-powder Al2O3,silicon powder and bauxite-based β-SiAlON as starting materials and resin as binder.The phase composition,microstructure,physical properties,high temperature modulus of rupture（HMOR） and thermal shock resistance（TSR） of the specimens after firing at 1500 ℃ have been studied.The results show：（1） The Al2O3-SiC-SiAlON composite can be prepared by corundum and Si firing at high temperature in carbon embedded condition and β-SiAlON addition can promote Si reaction.This composite is sintered well at 1500 ℃.（2） HMOR and TSR increase with the increase of Si content,thermo-mechanical properties is further increased with appropriate β-SiAlON addition.（3） The improved thermo-mechanical properties may be attributed to Si reacting with C,CO and N2 to form SiC whisker or fiber and flocculent-like O＇-SiAlON which would fill in the interstices of corundum skeleton structure,forming interlocking network structure,thus creating strengthening and toughening effect.

关 键 词：Al2O3-SiC-SiAlON复合材料 SIC Β-SIALON 高温机械性能 显微结构 

分 类 号：TQ175.1[化学工程—硅酸盐工业]