文献类型：期刊文献

英文题名：Surface treatment and hydrolysis kinetics of organic films coated AlN powder

作者：Shan, HB; Zhu, Y; Zhang, ZT

机构：[1]E China Univ Sci & Technol, Basic Educ Inst, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Natl Engn Res Ctr Ultrafine Powders, Shanghai 200237, Peoples R China

年份：1999

卷号：98

期号：3

起止页码：146

外文期刊名：BRITISH CERAMIC TRANSACTIONS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000082262900006)】；

语种：英文

摘要：The resistance to hydrolysis of aluminium nitride (AlN) powder was improved by coating the surface of the AlN particles with oleic (OA) and 8-hydroxyquinoline (HQ). The treated powders did not react with water at 40 degrees C when soaked for up to 70 h at constant pH, whereas under the same conditions uncoated AlN reacted with water after 2-10 h soaking. However, with an increase in temperature (65-80 degrees C), hydrolysis of the coated powder took place rapidly. The hydrolysis kinetics of AlN powder with OA and HQ films were found to occur in two stages, a diffusion controlled stage and a surface reaction controlled stage, both of which were first order reactions with activation energies of 125 and 114 kJ mol(-1), respectively. The increased resistance to hydrolysis was the result of the organic films forming a diffusion barrier between the water and the AlN surface. Hydrolysis of the coated AlN powder at high temperature was attributed to the ready break-down of the film by erosion by the hot water. This explanation was supported by TG-DTA, XRD, and IR examination. BCT/290.