Effect of Micropowder Introduction on Synthesis of SiAlON-bonded SiC Products  

作　　者：XU Dayan ZHOU Kaikai ZHAI Wanyu FAN Yajuan WANG Guangqiang 

机构地区：[1]Sinosteel Refractory Co.,Ltd.,Luoyang 471039,China [2]School of Mechanical Engineering,Dalian Jiaotong University,Dalian 116028,China [3]School of Mechanical Engineering,Zhengzhou University of Science and Technology,Zhengzhou 450064,China

出　　处：《China's Refractories》2019年第3期15-18,共4页中国耐火材料（英文版）

摘　　要：This work aims at preparing SiAlON-bonded SiC products with high SiAlON contents.Silicon carbide fines,micropowders of Si,Al and alumina with different activities were premixed in a ball mill to obtain different composite micropowders.Then silicon carbide particles,the composite micropowders and binder were wet mixed.After shaping the specimens were fired under insulation from direct flame in a shuttle kiln at 1450℃in nitrogen atmosphere.The chemical composition,microstructure,pore size distribution and CO resistance of the prepared specimens were tested.The results showed that:after introducing high-activity micropowder additives the SiAlON content grows from 14.8 mass%to 23.5 mass%;the amount of unreacted alumina and silicon nitride in the specimens falls from 8.78 mass%to 1.79 mass%;micropores with size under 1m increase from 30%to 68%;CO resistance reaches level A.This work aims at preparing SiAlON-bonded SiC products with high SiAlON contents. Silicon carbide fines, micropowders of Si, Al and alumina with different activities were premixed in a ball mill to obtain different composite micropowders. Then silicon carbide particles, the composite micropowders and binder were wet mixed. After shaping the specimens were fired under insulation from direct flame in a shuttle kiln at 1 450 ℃ in nitrogen atmosphere. The chemical composition, microstructure, pore size distribution and CO resistance of the prepared specimens were tested. The results showed that: after introducing high-activity micropowder additives the SiAlON content grows from 14.8 mass% to 23.5 mass%; the amount of unreacted alumina and silicon nitride in the specimens falls from 8.78 mass% to 1.79 mass%; micropores with size under 1 μm increase from 30% to 68%; CO resistance reaches level A.

关 键 词：SIALON carbon monoxide resistance pore size distribution ACTIVITY 

分 类 号：TQ163.4[化学工程—高温制品工业]