氮化硅粉体的表面化学性质和水中的胶体特性

陶瓷粉体的表面性质和胶体行为对成型、烧结等工艺过程有很大影响。本文回顾了近年来对氮化硅粉体的表面化学性质和水中的胶体特性的研究成果。系统介绍了氮化硅粉体表面元素的键合状态、表面官能团、氧在颗粒表面和内部的分布和表面富氧层的厚试行表面化学性质，以及氮化硅颗粒在水中的荷电机理、等电点和Ｚｅｔａ电位与表面氧含量的关系、含烧结助剂氮化硅多相体系的胶体特性和分散剂的作用机理等胶体特性。

Surface Characteristics and Aqueous Colloidal Chemistry of Silicon Nitride Powder

The surface characteristics and aqueous colloidal behavior of ceramic powders have important effects on colloidal forming process, sintering and even properties of ceramics. In this paper, we reviewed the research results about surface characteristics and aqueous colloidal behavior of silicon nitride powder in recent years. The surface characteristics, which includes surface chemical bonding, surface functional group, distribution of oxygen on the surface and in the bulk, and thickness of surface oxygen-rich layer, as well as the aqueous colloidal chemistry, which includes charging mechanism, relationship between surface oxygen content and Zeta potential, colloidal property of powder mixtures with oxide , were reviewed systematically.