纳米ZrO_2对Al-Si复合Al_2O_3-C材料性能、组成和结构的影响  

Effects of Nano-ZrO_2 Powder Addition on Properties,Phase Composition and Microstructure of Al-Si Incorporated Al_2O_3-C Materials

作　　者：刘志芳[1] 刘新红[1] 黄亚磊 马腾[1] 

机构地区：[1]郑州大学河南省高温功能材料重点实验室,河南郑州450052

出　　处：《郑州大学学报（工学版）》2015年第5期15-19,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省重点科技攻关资助项目(14A430030);郑州市科技局攻关资助项目(131PPTGG409-3)

摘　　要：以板状刚玉骨料和细粉、Al粉、Si粉、石墨和纳米ZrO2粉为原料,以酚醛树脂为结合剂,研究了纳米ZrO2粉对Al-Si复合Al2O3-C材料性能、组成和结构的影响.结果表明:引入纳米ZrO2粉对试样的常温和高温强度影响不大,但有利于提高试样的成型致密度和抗氧化性,可明显提高试样的抗热震性.试样致密度提高的原因在于纳米氧化锆具有良好的填充作用和助烧结作用.纳米ZrO2可促进Al、Si反应生成更多非氧化物晶须,并在试样中形成交叉连锁的网络结构,以及纳米粉的增韧和ZrO2的相变增韧均有利于提高试样的抗热震性.The effects of nano-ZrO2 powder addition on properties, A1-Si incorporated A1203-C materials have been investigated using phase composition and microstructure of tabular alumina aggregates and fines, Al powder, Si powder, graphite and nano-ZrO2 powder as starting materials, resin as binder. The results show： there is almost no effect of nano-ZrO2 powder addition on strength properties both at room temperature and high temperature; nano-ZrO2 powder addition contributes to increase in density and oxidation resistance as well as noticeably increase in thermal shock resistance. The increase of density may be due to good filling effect and promoting sintering of nano-ZrO2 powder. The noticeably increased thermal shock resistance may be attributed to the following reasons： Nano-ZrO2 powder addition promotes Al, Si reacting with C, CO and N2 in-situ formation of AIN and SiC whiskers, and the whiskers constitute network structure creating toughening effects. Besides, the nano powder possesses toughening effect and nano-ZrO2 phase transformation creates toughening effect.

关 键 词：Al-Si复合Al2O3-C材料 纳米ZrO2粉 高温机械性能 物相组成 显微结构 

分 类 号：TQ175.1[化学工程—硅酸盐工业]