Method for preparing AlN ceramic powder by carbothermal reduction nitridation method

• Main Authors: SHAN YINGCHUN, XU JIUJUN, XU JINHAI
• Format: Patent
• Language: Chinese; English
• Published: 14.02.2020
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention relates to a method for preparing AlN ceramic powder through a carbothermal reduction nitridation method, and belongs to the field of ceramic material preparation. The method is carriedout in an atmosphere synthesis device by taking aluminum oxide powder, carbon powder and nitrogen gas as raw materials, in the preparation process, nitrogen gas is continuously or intermittently introduced into the atmosphere synthesis device, and the gas pressure in the atmosphere synthesis device is controlled to generate pressure difference by adjusting the gas charging rate and the gas discharging rate, so that the atmosphere synthesis device has the pulse type characteristics of slow charging and quick discharging and is dynamically changed in real time in a periodic circulation manner, and the circulation period is 0.1-20 minutes. According to the invention, under the condition of no additive, pulse-type periodically-circulating real-time-changing air pressure is formed by utilizingan air pressure regulation