Coating for tungsten-copper alloy material and preparation method thereof

Abstract

The invention discloses a coating for a tungsten-copper alloy material. The coating comprises a transition layer and an anti-oxidation layer formed on the surface of the alloy material in sequence, wherein the transition layer comprises the following raw materials in parts by weight: 15-20 parts of nano tin oxide, 10-15 parts of strontium fluoride, 0.1-0.5 part of tetrabutyl titanate and 1-5 parts of polyvinyl alcohol, and the anti-oxidation layer comprises the following raw materials in parts by weight: 10-20 parts of nano cerium oxide and 30-50 parts of silicon-barium-iron alloy powder. Two components of nano tin oxide and strontium fluoride are added into the transition layer so that the bonding strength of the transition layer is improved, and the porosity is reduced. The silicon-barium-iron alloy powder in the anti-oxidation layer reacts with oxygen in a high-temperature environment so that the alloy material is prevented from being oxidized at a high temperature, and the compactness of the anti-oxidation layer is improved through the nano cerium oxide. The invention further provides a preparation method of the coating for the tungsten-copper alloy material, the transition layer is prepared in a sintering mode, the anti-oxidation layer is sprayed to the surface of the transition layer through hypersonic flame, and it is guaranteed that the coating is uniformly distributed on the surface of the alloy material and does not easily crack or fall off.

Description

technical field [0001] The invention relates to a coating, in particular to a coating for a tungsten-copper alloy material and a preparation method thereof. Background technique [0002] Tungsten alloy is a kind of alloy based on tungsten (85%~99% tungsten content) and added with a small amount of Ni, Cu, Fe, Co, Mo, Cr and other elements. The alloy has high density and high melting point. , large specificity and good electrical and thermal conductivity, its density is as high as 16.5-18.75g / cm 3 , is commonly known as high specific gravity alloy, heavy alloy or high density tungsten alloy. Among them, tungsten copper alloy is widely used in aerospace, electronics, weapon manufacturing and other industries, and is often used to make gyroscope rotors, armor-piercing projectile cores, heat shields, electrodes, etc. However, tungsten-copper alloys are easily oxidized in high-temperature aerobic environments, and relatively rapid oxidation occurs above 400 ° C, forming unprote...

AI Technical Summary

Problems solved by technology

[0003] There are many problems in the existing coating on the surface of tungsten-copper alloy materials, which cannot meet the application requirements of alloy materials in different fields, such as weak bonding with the material surface and easy to fall off, high porosity, poor compactness, and oxidation resistance cannot meet the use requirements etc., which limit the application of tungsten-copper alloys, so a kind of coating is urgently needed to solve the above problems

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