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Tantalum-tungsten alloy powder and preparation method thereof
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A technology of tantalum-tungsten alloy and powder, which is applied in the field of tantalum-tungsten alloy powder and its preparation, and can solve the problems of immature spherical powder of tantalum-tungsten alloy
Active Publication Date: 2022-02-08
宁夏东方智造科技有限公司
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Problems solved by technology
At present, domestic research on pure tantalum spherical powder is relatively mature, while research on tantalum-tungsten alloy spherical powder is still immature
Method used
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Embodiment 1
[0057] 1) Ingot casting: Use ALD1200KW high-vacuum electron beam furnace to melt Ta10W tantalum-tungsten alloy (Ta90wt%-W10wt%) ingot, and repeat the smelting twice to make the unevenness of tungsten within 10%.
[0058] 2) Forging: heating the ingot obtained in 1) for forging, controlling the forging temperature to 850°C, forging to 50×120×Lmm, fully breaking the as-cast grains, and obtaining a broken internal structure;
[0059] 3) Machining: Turn both ends of the forged billet obtained in 2), turn 1.5mm for a single surface, and mill 4 sides to completely remove defects such as forging folds;
[0060] 4) Pickling: According to HF (>40%): HNO 3(65%-68%): HCl (36%-38%) = 1:2:3 (volume ratio) acid solution, clean the product of the previous step, and remove surface impurities;
[0061] 5) Hydrogenation: put the product of the previous step into the reaction bomb, and evacuate to 10 -6 kPa, temperature rise: 600°C / 4 hours, keep warm at 800°C / 2 hours, and pass hydrogen to the ...
Embodiment 2
[0073] 1) Ingot casting: use ALD600KW high vacuum electron beam furnace to melt Ta10W tantalum-tungsten alloy (Ta90wt%-W10wt%) ingot, and repeat the smelting twice to make the unevenness of tungsten within 10%.
[0074] 2) Forging: heating the ingot obtained in 1) for forging, the forging temperature is controlled at 900°C, forging to 50×120×Lmm, fully breaking the as-cast grains, and obtaining a broken internal structure;
[0075] 3) Machining: Turn both ends of the forged billet obtained in 2), turn 1.5mm for a single surface, and mill 4 sides to completely remove defects such as forging folds;
[0076] 4) Pickling: According to HF (>40%): HNO 3 (65%-68%): HCl (36%-38%) = 1:2:3 (volume ratio) acid solution, clean the product of the previous step, and remove surface impurities;
[0077] 5) Hydrogenation: put the product of the previous step into the reaction bomb, and evacuate to 10 -6 kPa, heating: 750°C / 4 hours, heat preservation at 800°C / 2 hours, and hydrogen flow to a p...
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Abstract
The invention provides a method for preparing tantalum-tungsten alloy powder, comprising the following steps: providing a tantalum-tungsten alloy ingot; melting the tantalum-tungsten alloy ingot repeatedly for several times; forging the product of the previous step; placing the product of the previous step in a hydrogen atmosphere Hydrogenation heat treatment is carried out under low temperature; the product of the previous step is mechanically crushed to obtain a coarse powder; the powder with a particle size range of a μm-b μm is sieved from the coarse powder, a=10~20, b=50~60; the product of the previous step is vacuum Dehydrogenation heat treatment is carried out in the next step; magnesium powder is added to the product of the previous step to perform oxygen-reducing heat treatment; the product of the previous step is subjected to plasma spheroidization treatment to make the powder sphericity reach more than 99%.
Description
technical field [0001] The invention belongs to the field of materials, and in particular relates to tantalum-tungsten alloy powder and a preparation method thereof. Background technique [0002] Tantalum-tungsten alloy is a rare metal alloy material with high density, high melting point and high strength. It has high high temperature strength, good ductility, weldability and excellent corrosion resistance. It is suitable for high temperature, high pressure and corrosion resistance. In recent years, it has developed rapidly in industry, especially in the chemical industry, aerospace and atomic energy industries. It is a very important engineering and functional material. Tungsten forms a replacement continuous solid solution with tantalum in tantalum, which plays a role of solid solution strengthening and significantly improves the mechanical properties of tantalum metal at room temperature and high temperature. [0003] At present, tantalum-tungsten alloy materials are con...
Claims
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