US 12,662,378 B2
Aluminum oxynitride powder, direct nitridation high-pressure synthesis method and application thereof
Youfu Zhou, Fuzhou (CN); Jian Yang, Fuzhou (CN); Wentao Xu, Fuzhou (CN); and Maochun Hong, Fuzhou (CN)
Assigned to FUJIAN INSTITUTE OF RESEARCH ON THE STRUCTURE OF MATTER, CHINESE ACADEMY OF SCIENCES, Fuzhou (CN); and MINDU INNOVATION LABORATORY, Fuzhou (CN)
Filed by FUJIAN INSTITUTE OF RESEARCH ON THE STRUCTURE OF MATTER, CHINESE ACADEMY OF SCIENCES, Fuzhou (CN); and MINDU INNOVATION LABORATORY, Fuzhou (CN)
Filed on Nov. 10, 2021, as Appl. No. 17/454,405.
Claims priority of application No. 202011248445.3 (CN), filed on Nov. 10, 2020.
Prior Publication US 2022/0144637 A1, May 12, 2022
Int. Cl. C01B 21/082 (2006.01)
CPC C01B 21/0825 (2013.01) [C01P 2002/72 (2013.01); C01P 2004/03 (2013.01); C01P 2004/32 (2013.01); C01P 2004/61 (2013.01); C01P 2006/60 (2013.01); C01P 2006/80 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A preparation method of AlON powder by direct nitridation, comprising:
step (1), mixing an aluminum powder, an alumina powder and absolute ethanol homogeneously to form a mixture;
step (2), removing the absolute ethanol from the mixture by rotary evaporation, followed by vacuum drying and sieving to obtain a mixed powder;
step (3), loading the mixed powder in a plurality of crucibles, stacking the plurality of crucibles in a staggered manner in a pressure sintering furnace, and introducing nitrogen to the pressure sintering furnace until an internal gas pressure thereof is 1.5-3.0 MPa; and
step (4), calcining the mixed powder at 1700-1800° C. in the pressure sintering furnace for 1-3 h, reducing the temperature to 900-1100° C., relieving the internal gas pressure in the pressure sintering furnace and cooling the temperature therein to room temperature to obtain the AlON powder,
wherein the AlON powder has a purity of at least 99.9%.