Combustion Synthesis of Silicone Carbide Powder for Advanced Ceramic Materials

提出了一种在燃烧合成法中制备超纯、纳米、单分散、球形碳化硅颗粒的可行性评估方案。在这个过程中，乙炔和硅烷是火焰中的“燃料”和“氧化剂”，其产物是碳化硅粉末和氢气。火焰一经点燃(如由电火花点燃)，就会继续燃烧，生产出的产品。产品收集在液体分散剂中，以最大限度地减少团聚，并防止非常活跃的新形成的表面被氧化。挑战在于生产一种纯材料，其游离碳或游离硅的含量可以忽略不计，它们分别是在过量的乙炔或过量的硅烷混合物中形成的。

A program is proposed to evaluate the feasibility of preparing ultrapure, nanophase, monodispersed, spherical particles of silicon carbide in a combustion synthesis process. In this process acetylene and silane are the "fuel" and "oxidizer" in a flame for which the products are silicon carbide powder and hydrogen gas. Once the flame is ignited, eg by an electric spark, it continues to burn producing product. The product is collected in a liquid dispersant to minimize agglomeration and to prevent oxidation of the very active newly formed surfaces. The challenge is to produce a pure material with a negligible quantity of free carbon or free silicon which are formed in excess acetylene or excess silane mixtures, respectively.