还原钨粉粒度特性的过程研究

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Abstract The particle size, particle size distribution and agglomeration of tungsten powder are closely related to the properties of subsequent products. In this paper, the reduction process of yellow tungsten oxide and blue tungsten oxide is studied by static reduction test at different temperature and time. The particle size distribution and agglomeration state of the powder were analyzed by scanning electron microscope, the phase change process of the powder was analyzed by X-ray diffraction and oxygen index, and the macroscopic particle size change was characterized by specific surface area. The results show that yellow tungsten (WO₃) and blue tungsten (WO_2.9) have the same reaction rate and morphology change process. The particle size, particle size distribution and agglomeration are closely related to reduction temperature. After reduction at a low temperature below 700 ℃, the tungsten powder particles are uniform in size and easy to agglomerate. When the temperature is above 800 ℃, the agglomeration of the powder decreases and the particle size is uneven.

Key words： tungsten oxide reduction tungsten powder particle size distribution agglomeration

Received: 20 December 2019 Published: 18 January 2021

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TF123.72

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	CHEN Shanshan

Cite this article:

CHEN Shanshan. Process research on particle size characteristics of reduced tungsten powder[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(5): 389-395.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I5/389

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