沉淀-氨解法制备超细高纯氮化铬粉体

Synthesis of Ultrafine CrN Powder with High Purity by Ammonolysis Method

以氨水直接沉淀法制备的纳米Cr2O3为前驱体,采用氨解法制备了纯度99%以上的高纯超细CrN粉体。对不同氨解温度、氨解时间和不同前驱体合成的CrN粉体用XRD、SEM和氮/氧分析等方法进行了表征。对CrN粉体合成的原理及其主要影响因素进行了分析,并研究了不同前驱体、不同氮化温度和不同氮化时间对CrN粉体性能的影响。结果表明,将氨水直接沉淀法制备的Cr2O3粉体在800℃下利用氨气氮化12h可得到纯度99.15%高纯超细氮化铬粉体,粒径大小约为0.2μm左右。

The nano-sized chromium oxide powder was synthesized by precipitating with ammonia and then was nitrided by NH3. The ultrafine and high-pure chromium powder with purity more than 99% was obtained. X-ray diffraction、SEM and nitrogen/oxygen analyzer were adopted for the characterization of the powders obtained under different ammonolysis conditions. The influences of the ammonolysis temperature、the holding time and different phosphors on the powder properties were investigated and the principle of reaction were analysed. The results show that the ultrafine and high-pure CrN powder with purity more than 99.15% and size of 0.2 μm was synthesized at 800 ℃ for 12 h by ammonolysis of the ultrafine chromium oxide which was synthesized by ammonia precipitation method.