Synthesis of Al N Powder by Carbothermal Reduction-nitridation of Alumina/Carbon Black Foam

• 作 者: MAO Xi-Xi1 2 3 LI Jun1 ZHANG Hai-Long2 XU Yong-Gang1 2 3 WANG Shi-Wei1 2
• 机 构: 1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institut
• 出 处: 无机材料学报
• 发表日期: 2017年10期

Alumina/carbon black foam was prepared by mechanical foaming and aqueous gelcasting and used as precursor for the production of Al N powder. The foam with large open pores ensures homogeneous solid-gas reaction during carbothermal reduc-tion-nitridation (CRN) process. Further, the solid-gas contact is enlarged by oppositely feeding the foam and nitrogen in a vertical furnace. Solid-gas reaction efficiency of the CRN process was greatly enhanced when total porosity of the foam was ≥80%. XRD results revealed that γ-Al2O3 transformed to α-Al2O3 and then was carbothermal reduction-nitridationed to be Al N phase. Al N pow-der with an average particle size of less than 1 μm was synthesized at 1650℃ and contained 32.9wt% nitrogen.

Alumina / carbon black foam was prepared by mechanical foaming and aqueous gelcasting and used as precursor for the production of Al N powder. The foam with large open air content homogeneous homogeneous-gas reaction during carbothermal redution-nitridation (CRN) process. , the solid-gas contact is enlarged by oppositely feeding the foam and nitrogen in a vertical furnace. Solid-gas reaction efficiency of the CRN process was greatly enhanced when total porosity of the foam was ≥80%. XRD results revealed that γ-Al2O3 AlN pow-der with an average particle size of less than 1 μm was synthesized at 1650 ° C. and contained 32.9 wt% nitrogen. transformed to α-Al 2 O 3 and then was carbothermal reduction-nitridationed to AlN phase.