聚乙二醇表面改性SiC粉体的物性表征

The Material Properties Characterization of SiC Powder Surface-modified by Polyethylene Glycol

采用聚乙二醇(PEG200)作为分散剂对工业用SiC粉体进行表面改性处理,通过TG、IR、电镜等测试技术研究了改性前后SiC粉体的流动特性、吸附、热重以及形貌等物性,分析了PEG加入量及液体介质对各种物性的影响。试验结果表明:PEG添加量为5%(质量分数),介质为乙醇时,改性SiC粉体流动特性较好;PEG在粉体表面的吸附量随PEG量的增加而增加,介质基本不影响吸附量;SiC粉体表面吸附的PEG可以烧尽;改性后颗粒之间分散较好,尺寸分布均匀,形状多为块状分布;粉体改性后碳化硅陶瓷制品的烧结性能得到改善。

The surface modification of industrial SiC powders were carried out by polyethylene glycol (PEG 200), and the effects of PEG weight and liquid media on the flow characteristics, adsorption, thermal analysis and morphology of the modified powder were analyzed by TG, IR and SEM.The results show, when the content of PEG 200 is 5%(mass fraction) and liquid media is alcohol, the modified powder has better flow characteristics; the adsorption content on SiC powder surface increases with PEG content,it is not effected by liquid medias; the PEG on SiC powder surface can be burned out at 0~500℃; the particles in the modified powder has better dispersive and of uniformly blocky; the sintering characteristics of the silicon carbon product with the modified SiC can be improved.