摘要
以石英玻璃粉作为基体材料,添加0~1wt.%的碳化硼为矿化剂,通过热压注法制备了硅基陶瓷型芯,探究了不同碳化硼含量对硅基陶瓷型芯综合性能影响的变化规律。试验结果表明:随着碳化硼含量的增加,样品的收缩率和体积密度逐渐增大,气孔率逐渐减小。此外,室温抗弯强度和高温抗弯强度随着碳化硼含量的增加先增大后减小,高温挠度先减小后增大;当碳化硼含量为0.3wt.%时,陶瓷型芯综合性能得到大幅度改善,收缩率为1.44%,体积密度为1.67 g/cm^(3),气孔率达到25.51%,室温抗弯强度为16.32 MPa,高温抗弯强度为33.2 MPa,高温挠度为0.19 mm。
Silicon-based ceramic cores with different contents of boron carbide were prepared by hot-pressing injection method with quartz glass powder as raw material.The effect of boron carbide with different contents on crystallization and properties of silica ceramic cores was investigated.The experimental results indicated that with the increase of boron carbide contents,the shrinkage rate and bulk density of the sample gradually increased,and the porosity gradually decreased.The room temperature and high temperature of bending strength increased first and then decreased with the increase of boron carbide content,and the high temperature deflection decreased first and then increased.When the contents of boron carbide is 0.3wt.%,the comprehensive properties of the ceramic core are greatly improved,with shrinkage rate of 1.44%,the bulk density of 1.67 g/cm^(3),the porosity of 25.51%,bending strength of 16.32 MPa at room temperature,bending strength of 33.2 MPa at high temperature,and high temperature deflection of 0.19 mm.
作者
刘泳鸿
玄伟东
张强
何忠书
宋昊睿
邵冠兰
任忠鸣
LIU Yong-hong;XUAN Wei-dong;ZHANG Qiang;HE Zhong-shu;SONG Hao-rui;HAN Guan-lan;REN Zhong-ming(Department of Material Science and Engineering,State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China)
出处
《铸造》
CAS
2024年第4期532-539,共8页
Foundry
基金
国家自然科学基金项目(项目号52274386,92060104)。
关键词
陶瓷型芯
碳化硼
析晶规律
抗弯强度
ceramic core
boron carbide
crystallization law
bending strength
