碳化硅磨料在陶瓷磨具中氧化性能的研究  

Investigation on the oxidation behavior of SiC abrasives

作　　者：刘芳[1] 范文捷[1] 

机构地区：[1]中原工学院,郑州450007

出　　处：《金刚石与磨料磨具工程》2005年第5期45-47,共3页Diamond & Abrasives Engineering

基　　金：河南省自然科学基金项目(0411052200)

摘　　要：碳化硅磨料在陶瓷磨具中的氧化性能对碳化硅细粒度陶瓷磨具的黑心有直接的影响,也是行业一直关注的问题;本文通过试验、结合化学动力学计算和扫描电镜分析,对碳化硅磨料在陶瓷磨具中的氧化性能进行了初步的研究。试验的计算结果表明:碳化硅磨料在现行的烧成制度下,氧化反应是不可避免的,氧化产物S iO2也不会在S iC磨料表面形成致密保护层;碳化硅磨具产生黑心原因关键在于陶瓷结合剂的性质。陶瓷结合剂的完全烧结温度若略高于烧成温度或能始终保持结合剂的适当开口气孔率,就可能避免产品黑心的产生。The oxidation behavior of SiC abrasive grains showed evident effect on the black-heart phenomenon of fine-grained ceramic abrasive tools. It was the most concern in abrasive applications. In this study, SEM technique was used to characterize the sample. Chemical dynamic process was analyzed. It was found that SiC was easily oxidized during the heating process. No dense SiO2 layer was formed to protect the SiC. The oxidation of SiC led to the black heart due to the degradation of the ceramic binder. It could be avoided efficiently by increasing the sintering temperature as well as the apparent porosity in the binder.

关 键 词：碳化硅 陶瓷磨具 氧化性能 

分 类 号：TG74[金属学及工艺—刀具与模具]