一种碳化硅粉体的处理及其沉淀行为  

Surface Treatments and Sedimentation Behavior of a Fine SiC Powder

作　　者：周洋[1] 高立强[1] 翟洪祥[1] 李世波[1] 张志力[1] 李翠伟[1] 

机构地区：[1]北京交通大学机电学院材料研究所,北京100044

出　　处：《稀有金属材料与工程》2007年第A01期173-176,共4页Rare Metal Materials and Engineering

基　　金：教育部留学回国人员科研启动基金项目(教外司留[2005]383);国家自然科学基金项目(50672005)

摘　　要：以一种日本产β-SiC粉体为原料,采用煅烧、酸洗和碱洗的方法对粉体表面进行处理,然后用相同的工艺配制出原始粉体和3种处理粉体的酸性(pH=3)、中性(pH=7)和碱性(pH=10)水料浆,通过料浆中分界面高度随时间的变化研究各料浆的沉淀行为,同时测量几种粉体的Zeta电位,并进行红外光谱分析。结果表明,当pH值为3和时,4种料浆的沉淀行为相似;而当pH值为10时,3种处理粉体表现出与原始粉体截然不同的沉淀行为。红外光谱分析显示,原始粉体表面含有游离碳和碳氢化合物等杂质,因而料浆稳定性差,碱洗和酸洗可有效去除这些杂质,显著改善料浆的稳定性,而碱洗和酸洗的效果更优于煅烧。Main impurities including hydrophobic free carbon and hydrocarbon on the particle surface caused the low dispersibility and less deposition for the as-received SiC powder in aqueous suspension. Three kinds of surface pretreatments, i.e., calcination in air, acid solution leaching and alkali solution leaching, were carried out for the as-received powder. All the pretreatments could eliminate the impurities on the particle surface of the as-received powder, and thus improve the dispersibility. After calcination, the dispersibility were enhanced obviously. However, for the calcined powder, the decrease in quantity of surface silanol group reduced the effect on improving dispersibility. Acid leaching and alkali leaching were more effective to improve the dispersibility.

关 键 词：碳化硅 粉体 表面处理 沉淀 

分 类 号：TB383.3[一般工业技术—材料科学与工程]