APT煅烧工艺对WO<sub>2.72</sub>晶体生长机制的影响

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Abstract WO_2.72powder was prepared by calcining APT powder at various temperatures and holding time in an industrial rotary furnace. The results indicate that the single-phase WO_2.72 powder can be obtained above 800 ℃. The morphology and size of WO_2.72 grains are strongly affected by calcining temperature, and the morphology changes from long-needle-like to short coarse rod-like at about 770-800 ℃ with increasing temperature. For long needle-like grains, with increasing temperature, their diameters increase slightly, but their lengths increase sharply. The growth mechanism is that monocrystalline grains nucleate grow into APT particles, accompanying by a small amount of WO_x·nH₂O vapor deposition-re-reduction on the surface of APT particles. For short coarse rod-like grains, with increasing temperature, an opposite result is obtained. The growth mechanism is that the multiple grains clustery nucleate and grow into APT particles to form rod-like grains. With increasing holding time, there is no obvious change in the morphology of WO_2.72 grains, and their diameter and length increase slightly.

Key words： APT industrial rotary furnace calcining WO_2.72 grains growth mechanisms

Received: 16 November 2020 Published: 22 March 2021

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	Articles by authors
	LONG Benfu
	LIN Gaoan
	ZHANG Taiquan
	SHEN Siqi

Cite this article:

LONG Benfu,LIN Gaoan,ZHANG Taiquan, et al. Effect of calcining process of APT on growth mechanisms of WO_2.72crystals[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(1): 32-39.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I1/32

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