无团聚SiC粒子复合Sialon陶瓷

Agglomerate-free SiC_(p) Reinforced α-β Sialon Composites

研究致密、无团聚ＳｉＣ粒子复合Ｓｉｌａｏｎ陶瓷的制备．经聚乙二醇表面活性剂处理后，ＳｉＣ粒子表面状态发生变化，可均匀地分散在Ｓｉａｌｏｎ基质中．红外吸收光谱测试结果已证实：聚乙二醇分子链被修饰在ＳｉＣ粒子表面，起空间位阻作用，防止ＳｉＣ团聚．聚乙二醇分子量、聚乙二醇用量，悬浮液的ｐＨ值以及ＳｉＣ粒子在液体中的浸泡时间均影响表面活性剂的分散效果．

Densitied and agglomerate-free SiC(p) reinforced α-β sialon composites were fabricated. SiC pericles can be selectively modified on the surfaces by hydrogen bonds with PEG (Polythylene Glycol) surfactant and well-dispersed in the madrid. It was confirmed that organic chains in PEG are anchored on the surfaces of SiC powder producing the spatial inhibition to avoid agglomeration, according to the IR(infrared) absorption spectra of PEG-modified SiC. Dispersion roles of PEG are mainly influenced by the molecular weight of surfaCtaDt, surfactant content, pH value of the suspension, and the soaking time of SiC powder in the solution.