Tungsten Alloy Ultra-thin Plate Preparation

Tungsten alloys are alloys based on tungsten with other metals. They have small size, high density, high melting point, high hardness, high wear resistance, high ultimate tensile strength, good ductility, low vapor pressure, high temperature resistance, good thermal stability, corrosion resistance, good seismic resistance, extremely high radiation absorption capacity and excellent impact resistance. It is widely used in industry, military, scientific research, medical treatment, sports and other fields because of its excellent properties such as strength, crack resistance and non-toxicity.

Tungsten alloy ultra-thin sheet is a tungsten alloy sheet with thickness less than 0.13mm. It is in great demand in aviation, aerospace, military, petroleum drilling, electronic equipment, medical field and measurement system. In the existing technology, the preparation methods of tungsten alloy sheets with high specific gravity are less, especially the ultra-thin sheets with thickness less than 0.1 mm. There are few manufacturers in China.

In order to solve the above problems, some scholars have proposed a scheme for preparing tungsten alloy ultra-thin plates with high specific gravity, which can be made into high specific gravity alloy plates with thickness of 0.03mm to 0.09mm. It includes the following steps:

(1)Mixture: Tungsten powder is mixed proportionally with one or more powders of nickel, iron, copper, cobalt, molybdenum and chromium, of which tungsten powder accounts for 85%-99%, and is reserved after vacuum drying.

(2)Compression moulding and liquid phase sintering;

(3)The sintered billet is cold rolled to the thickness of 0.6 mm~3 mm.

(4)The cold-rolled billets obtained by multi-step (3) are stacked together and sintered for 1-2 hours in a high temperature sintering furnace protected by hydrogen at 1400-1500 ℃ and then hot-rolled to a thickness less than 0.13 mm to obtain a high specific gravity tungsten alloy sheet.

(5)The high specific gravity tungsten alloy sheet a obtained in step (4) is uniformly sprayed with tungsten powder and one or more mixed powders of nickel, iron, copper, cobalt, molybdenum and chromium, and then heated to 1400 ~1500 ℃ in an inert gas-filled furnace to form a permeable tungsten alloy sheet structure, followed by a non-sprayed sheet. The high specific gravity tungsten alloy sheet B coated with metal powder is bonded and heated until the melting point of the high specific gravity tungsten alloy sheet B is higher than that of the high specific gravity tungsten alloy sheet b, so that the high specific gravity tungsten alloy sheet B is melted and permeated into the permeable tungsten alloy sheet structure, and the heating and cooling can be stopped.

The high specific gravity tungsten alloy ultra-thin plates with thickness of 0.03 mm to 0.09 mm can be prepared by the above process, and their density is 15.8 g/cm³ to 18.75 g/cm³.

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