氮化铝粉末的水解行为研究

Hydrolysis behavior of AlN powders

研究了亚微米和纳米氮化铝粉末在不同温度下的水解行为,通过测定500nm和40nm的AlN粉末在不同温度水解时pH值随时间的变化,分析了粉末粒度和温度对AlN粉末水解行为的影响,并利用XRD和TEM研究了AlN粉末水解时物相和表面形貌的演变规律.结果表明:AlN粉末的水解速率与温度和粒度相关,并随温度的升高和粒度的减小而加快,XRD表明AlN粉末水解的产物为Al(OH)3和AlOOH,并且常温水解时Al(OH)3占主导,高温水解时AlOOH占主导.TEM显微图表明AlN粉末的水解在粉末表面的台阶上进行.

The hydrolysis behaviors of submicron and nano AlN powders at different temperatures were studied. By measuring the 500nm and 40nm AlN powders respectively at different temperatures and observing the dependence of pH on time, the effects of temperature and particle size on hydrolysis behavior were analyzed. And the hydrolysis products and the change of AlN surface morphology were studied with the aid of XRD and TEM. It is shown that the hydrolysis rate of AlN powders relates to temperature and particle size, which increases with the rising of tempera- ture and decreasing of granular size. XRD shows the hydrolysis products are Al （ OH ） 3 and AlOOH, Al （OH） 3 is the dominant hydrolysis product at room temperature and AlOOH dominates at high temperature. TEM micrograph shows the hydrolysis of AlN powders happens at the step of AlN powder surface.