Non-self-consumption electric arc smelting preparing method of tungsten alloy

Abstract

The invention discloses a non-self-consumption electric arc smelting preparing method of a tungsten alloy. The method comprises the steps of tungsten powder preliminary purifying, cold pressing molding, prefabricated block preparing, vacuum pumping, argon leading and electric arc smelting. Compared with the prior art, the method is simple in process, high in efficiency and low in cost, the purification effect is achieved, the tungsten alloy (the tungsten proportion content can reach 99.7% to 99.9%, and the proportion can reach up to 19.11) which is high in purity, free of obvious air holes, high in compactness (98.1% to 99.2%) and ultrahigh in proportion can be prepared, and the method can be applied to the fields of the electronic industry, the nuclear industry, aerospace and dynamic high-pressure physics and the like.

Description

technical field [0001] The invention relates to a non-consumable arc melting preparation method of high-density, ultra-high specific gravity tungsten alloy. Background technique [0002] Tungsten is a very important non-ferrous metal. It has a series of characteristics such as high melting point, high density, low thermal expansion coefficient, and excellent corrosion resistance. It is usually used in vacuum filaments, welding electrodes, counterweight materials, shielding materials, military Armor-piercing materials and rocket nozzles have a wide range of applications in the electronics industry, construction machinery, medical equipment, weaponry, aerospace and other fields. [0003] When tungsten is exposed to the air, it will be slightly oxidized at 400°C and rapidly oxidized to WO at 500-600°C. 3 , while WO 3 It will sublimate significantly above 800°C, so a vacuum environment or inert gas protection must be ensured during the tungsten preparation process. The meltin...

AI Technical Summary

Problems solved by technology

For example, "An arc melting method for tungsten alloy with high tungsten content" (Application Publication No.: CN 102492863A) mentions that tungsten powder has a low bulk density and is easily blown away by the arc pressure during the arc melting process, which is difficult to obtain by traditional methods. Uniform tungsten alloys with a tungsten content higher than 10%, and alloys with a tungsten content as high as 40% after technical improvement have also been difficult to successfully prepare; at the same time, due to the complicated preparation of electrodes for consumable arc melting, the processing difficulty and electron beam melting Problems such as low efficiency and high cost exist, which limit the promotion of related technologies

[0004] At present, the powder metallurgy method (less than 2500°C) is generally used in the preparation of bulk metal tungsten or high specific gravity tungsten alloys. Because the melting point of tungsten is too high, the high temperature and high strength limit performance of molds, crucibles, indenters and other materials currently used It is difficult to exceed 2500°C (graphite products can withstand high temperatures of 3000°C, but the strength is insufficient, the life is short and carbide impurities are introduced), and the tungsten content of the prepared high-density tungsten alloy is difficult to exceed 98% (see Table 1), often The compactness is improved by adding alloy elements with low melting point and low density, which limits the further improvement of its density (or specific gravity); the non-consumable arc melting technology used in the present invention is to prepare high compactness, An important technical means of high specific gravity tungsten alloy

Images