Synthesis of Nanosized CrN Powder by the Ammonolysis Method

The nanosized chromium oxide powders were synthesized by the precipitation method. Then they were nitrided by NH3 at 800-900℃ for 4-8h, and 40-80nm chromium nitride powders obtained. X-ray powder diffraction and TEM were adopted for the characterization of the powders obtained under different ammonolysis conditions. The influences of the ammonolysis temperature and the holding time on the powder properties were investigated. The results show that this process for preparing CrN powders possesses many advantages such as time saving, temperature lowering, and simpler equipment needed.