Synthesis of ZrO2-SiC composite powder and effect of its addition on properties of Al2O3-C refractories

• Published in: Transactions of Nonferrous Metals Society of China Vol. 17; no. 5; pp. 996 - 1000
• Main Author: 马北越 于景坤
• Format: Journal Article
• Language: English
• Published: School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China 01.10.2007
• Subjects: ZrO2-SiC复合材料; 压碎强度; 碳高温还原; 耐火材料; crushing strength; Al2O3-C refractories; ZrO2-SiC composite powder; carbothermal reduction; thermal shock resistance
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(07)60214-3

ZrO2-SiC composite powder was synthesized by carbothermal reduction of zircon in argon atmosphere, and it was used as the additive to prepare Al2O3-C refractories. The effects of heating temperature on the synthesis process and the addition of the synthesized composite powder on the properties of the Al2O3-C refractories were investigated. The results show that the synthesized composite powder can be easily obtained by heating the mixture of zircon and carbon black at 1 873 K for 4 h in argon atmosphere, and the relative contents of ZrO2 and SiC in sample reach about 83.7% and 16.3%, respectively. The bulk density, crushing strength and thermal shock resistance of the Al2O3-C refractories can be improved obviously by the addition of the synthesized ZrO2-SiC composite powder.