碳热还原氮化法制备超细AlN粉体的过程及特性

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Abstract The porous precursors were fabricated by extruding the mixture of superfine Al₂O₃ powder, nano carbon black and organic binder, and then adhesives-discharging. The precursors were calcined at high temperature to form AlN via the carbothermal reduction-nitridation reaction. Finally, the residual carbon was removed from the AlN calcined bodies and the AlN powder was obtained. Morphology, crystallinity, grain size, average particle size and the O, N and C contents of the AlN powder were investigated. The results show that the precursor has a porous structure with a high special surface area and spherical pores after adhesives-discharging at 360 ℃ for 2 h. After calcining at 1 650 ℃ and above, the product is composed of AlN, no Al₂O₃ residues is detected, indicating fulfillment of the AlN synthesis process. This experimental result agrees well with the thermodynamic calculation. The decarburization temperature has the greatest effect on the C content of the AlN powder and the feed rate is in the second place. The AlN powder synthesized by calcining at 1 700 ℃ for 12 h and decarburizing at 700 ℃ under the conditions of the pure oxygen atmosphere and the feed rate of 4 kg/h has a composition of 0.77% O, 33.42%N and 323×10^-6 C. The powder also has a high degree of sphericility, a narrow particle size distribution and an average particle size (d₅₀) as low as 1.36 μm. Such characteristics of the AlN powder are close to those of the foreign similar products.

Key words： AlN powder carbothermal reduction-nitridation precursor powder characteristics calcining

Published: 19 July 2019

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	Articles by authors
	WEI Xin
	ZHANG Hao
	SUN Dengqiong
	TIAN Chenguang
	LIU Xiangyu
	CUI Song
	TANG Wenming

Cite this article:

WEI Xin,ZHANG Hao,SUN Dengqiong, et al. Syntheses and characteristics of ultrafine AlN powder by carbothermal reduction-nitridation[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(6): 624-631.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I6/624

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