碳源对反应烧结碳化硅性能的影响
Effects of Carbon Sources on Properties of Reaction-Bonded Silicon Carbide
张喜飞 1陈定 1顾华志 1黄奥 1付绿平1
作者信息
- 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
- 折叠
摘要
以炭黑和石墨为碳源,控制碳添加量为10％(质量分数,下同),研究了不同炭黑、石墨比例对反应烧结碳化硅性能的影响.结果表明,当炭黑添加量为4％、石墨添加量为6％时,反应烧结碳化硅的力学性能较佳,此时抗弯强度为251.7 MPa,断裂韧性为4.29 MPa·m1/2.通过XRD检测及对XRD谱进行Rietveld精修,分析发现炭黑添加量为4％、石墨添加量为6％的反应烧结碳化硅中的游离Si含量为24.44％(质量分数),而石墨添加量为10％的反应烧结碳化硅中的游离Si含量为28.57％(质量分数),相比前者游离Si含量较高,减少游离Si的含量可以提高反应烧结碳化硅的力学性能.
Abstract
The carbon black and graphite were used as carbon sources to fabricate reaction-bonded SiC,and the total content of carbon sources was 10％(mass fraction,the same below).The effects of different ratios of carbon black and graphite on properties of reaction-bonded SiC were investigated.The results show that the reaction-bonded SiC with 4％carbon black and 6％graphite has good mechanical properties,the flexural strength and fracture toughness reach to 251.7 MPa and 4.29 MPa·m1/2.The mineral composition of reaction-bonded SiC was measured by XRD,the Rietveld simulation results of XRD patterns were adopted to measure phase content.The free Si content in reaction-bonded SiC with 4％carbon black and 6％graphite is 24.44％(mass fraction).The free Si content in reaction-bonded SiC with 10％graphite reaches to 28.57％(mass fraction),which is higher than that of the former.The decrease of free Si contributes to the improvement of mechanical properties of reaction-bonded SiC.
关键词
反应烧结碳化硅/炭黑/石墨/力学性能/游离SiKey words
reaction-bonded SiC/carbon black/graphite/mechanical property/free Si引用本文复制引用
基金项目
国家自然科学基金(52002295)
国家自然科学基金(52172023)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据