Preparation and properties of alumina-magnesia powder by sol-gel method

摘要

We examined the effect of raw materials on the properties of alumina-magnesia powders.In particular,we investigated about the amorphous structure of alumina-magnesia powder (AMA20 and AMH20,MgO content=20 mol%) prepared by sol-gel method.The specific surface area of an AMA20 powder prepared from ethyl acetoacetate aluminum diisopropoxide and magnesium acetate tetrahydrate was larger than that of an AMH20 powder prepared from ethl acetoacetate aluminum diisopropoxide and magnesium hydroxide.Crystallization behavior and true density depended on the raw materials used for magnesia.It is considered that the alumina and magnesia components in alumina-magnesia amorphous powder AMA20 were homogeneously mixed at the atomic level.