硅烷偶联剂对碳化硅粉体的表面改性.pdf

硅酸盐学报· 409 ·2011年硅烷偶联剂对碳化硅粉体的表面改性铁生年,李星(青海大学非金属材料研究所,西宁 810016) 摘要:采用KH-550硅烷偶联剂对SiC粉体表面进行改性,得到了改性最佳工艺参数,分析了表面改性对SiC浆料分散稳定性的影响。结果表明:SiC微粉经硅烷偶联剂处理后没有改变原始SiC微粉的物相结构,只改变了其在水中的胶体性质;减少了微粉团聚现象。与原始SiC微粉相比,改性SiC微粉表面特性发生了明显变化,Zeta电位绝对值提高,浆料的分散稳定性得到了明显改善。关键词:碳化硅;表面改性;硅烷偶联剂;分散性中图分类号:TQ174 文献标志码:A 文章编号:0454–5648(2011)03–0409–05 Surface Modification of SiC Powder with Silane Coupling Agent TIE Shengnian,LI Xing (Non-Metallic Materials Institute of Qinghai University, Xining 810016, China) Abstract: The surface characteristics of SiC powder were modified by a KH-550 silane coupling agent. The process parameters of the modification were optimized, and the effect of surface modification on the dispersion stability of SiC slurry was analyzed. The results show that the SiC powder modified by silane coupling agent can not change the original phase structure of SiC micro-powders butreduce the aggregation of SiC particles in the powders. Compared to the original SiC powder, the surface characteristics of the modi-fied SiC powder change significantly. Zeta potential of SiC increases, and the dispersion stability of SiC slurry is improved. Key words: silicon carbide; surface modification; silane coupling agent; dispersibility 在半导体制造和煤气化工程领域,许多工程都在使用SiC陶瓷[1–2]。然而经机械粉碎后的SiC粉体形状不规则,且由于粒径小,表面能高,很容易发生团聚,形成二次粒子,无法表现出表面积效应和体积效应,难以实现超细尺度范围内不同相颗粒之间的均匀分散以及烧结过程中与基体的相容性,进而影响陶瓷材料性能的提高[3]。加入表面改性剂,改善SiC粉体的分散性