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硼热/碳热还原反应合成ZrB2-SiC 复合粉体及其抗氧化性能
作者:王军凯1 杜爽2 邓先功1 张海军1 李发亮1 段红娟1 张少伟1 
单位:1. 武汉科技大学 省部共建耐火材料与冶金国家重点实验室 武汉 430081  2. 武汉钢铁集团耐火材料有限责任公司 武汉 430080 
关键词:硼热/碳热还原 硼化锆 碳化硅 复合粉体 抗氧化性能 
分类号:TB35
出版年,卷(期):页码:2015,43(9):1197-1202
DOI:10.14062/j.issn.0454-5648.2015.09.04
摘要:

 以锆英石、氧化硼和活性炭为原料,通过硼热/碳热还原合成工艺制备ZrB2-SiC 复合粉体。用X 射线衍射、场发射扫描电子显微镜和透射电子显微镜研究了ZrB2-SiC 复合粉体的物相组成和显微结构。用综合热分析仪研究ZrB2-SiC 复合粉体的氧化动力学。结果表明:以锆英石为原料,采用硼热/碳热还原反应工艺,1 500 反应3 h,合成出纯相ZrB2-SiC 复合粉体;复合粉体中,ZrB2 呈柱状或颗粒状,SiC 则呈晶须状。采用Kissinger 法和Ozawa 法,计算了ZrB2 SiC 的表观活化能,其数值分别为369 211 kJ/mol

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 ZrB2-SiC composite powders were prepared by a boro/carbothermal reduction method with zircon, boron oxide andactivated carbon as raw materials. The phase composition and microstructure of the final products were investigated by X-raydiffraction, field emission-scanning electron microscopy and transmission electron microscopy, respectively. The high-temperatureoxidation resistance of ZrB2-SiC composite powders was investigated by a non-isothermal thermogravimetry method. The resultsindicate that the nearly pure ZrB2-SiC powders can be synthesized at 1 500 for 3 h, and the prepared ZrB2 particles are hexagonalcolumnar-like or granular, and SiC particles are fibrous. The calculated apparent oxidation activitation energies for ZrB2 and SiC are369 kJ/mol and 211 kJ/mol based on the Kissinger and Ozawa methods.

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基金项目:
国家自然科学基金面上项目(51272188)资助。
作者简介:
第一作者:王军凯(1988—),男,硕士研究生。E-mail: 960331748@qq.com 通信作者:张海军(1970—),男,博士,教授。E-mail: zhanghaijun@wust.edu.cn
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