High-Strength Green Compact Tungsten Powder Preparation Process Brief Introduction

The high strength green compact tungsten powder is one of the important raw materials for large-diameter thin-walled tubes and thin tungsten plates with increasing demand in recent years. The quality requirements of related products are also getting higher and higher.

The physical and chemical properties of tungsten powder is closely related to the strength of the green compact. The strength of tungsten powder compacts is related to the characteristics of the material such as the morphology and size distribution of the tungsten powder. Therefore, the preparation of high strength green compact, well-formed tungsten powder, is the preparation of high-performance tungsten or tungsten content alloy products based.

Due to the physical, mechanical and other properties of tungsten powder are closely related to the strength of the green compact, the tungsten powder preparation process with high green compact strength is particularly important. The preparation process of tungsten powder with high green compacts strength is as follows: raw materials of mixture of blue tungsten oxide, purple tungsten oxide and yellow tungsten oxide are mixed in a double cone mixer at a ratio of 2: 5: 10 for 2 hours. The raw material is placed in a boat on a tiled floor and reduced in a reduction furnace. The thickness of the material layer should be controlled between 10-12mm, the heating rate of 50 ℃ / h, hydrogen dew point of -70-75 ℃.

Five with the reduction of the temperature distribution in the range of 700-950 ℃ high temperature to stay 170-180min. Will restore a good tungsten powder through the aperture 0.212mm, wire diameter 0.112mm and aperture 0.075mm, wire diameter 0.056mm twice. Finally, high strength green compact powder can be sealed and stored.

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