Tungsten Copper Alloy

Tungsten copper alloy is an alloy composed of tungsten and copper. Commonly used alloys contain 10% to 50% copper. The alloy is prepared by powder metallurgy, which has good electrical and thermal conductivity, good high-temperature strength and certain plasticity. At very high temperatures, such as above 3000°C, the copper in the alloy is liquefied and evaporated, absorbing a large amount of heat, and reducing the surface temperature of the material. So this kind of material is also called metal sweating material.

Since the two metals of tungsten and copper are incompatible with each other, tungsten-copper alloy has the low expansion, wear resistance, corrosion resistance of tungsten and the high electrical and thermal conductivity of copper, and it is suitable for various mechanical processing. Tungsten-copper alloys can be produced according to user requirements for tungsten-copper ratio production and size processing. Tungsten-copper alloys generally use powder metallurgy processes to prepare powder-batch mixing-press molding-sintering infiltration.

Tungsten Copper Electrode

Welding electrode

Tungsten copper alloy has high temperature resistance, arc ablation resistance, high specific gravity and high electrical and thermal conductivity, and is easy to machine and suitable for use in welding electrodes.

Tungsten Copper Alloy Rod

Tungsten copper is a composite material refined by the process of static pressing, high temperature sintering, and copper infiltration by taking advantage of the excellent metal properties of high-purity tungsten powder and the plasticity and high conductivity of high-purity copper powder. Good arc breaking performance, good electrical and thermal conductivity, low thermal expansion, no softening at high temperature, high strength, high density, and high hardness.

Tungsten Copper Electronic Packaging Sheet

Tungsten-copper electronic packaging material: It has both the low expansion characteristics of tungsten and the high thermal conductivity of copper. Its thermal expansion coefficient and electrical and thermal conductivity can be changed by adjusting the composition of the material, which provides convenience for the use of the material.

Tungsten Copper Tube

Tungsten copper alloy tubes are widely used in hard alloys and insoluble metals. Because tungsten-copper alloy is easy to machine, the use of tungsten-copper tube plays a big role when the surface needs to be easy to cut and the inner diameter is small.
Tungsten Copper Alloy Wire

Precautions for use:

• 1. Colloidal graphite cannot be placed on the surface of tungsten copper wire. When the temperature is above 1000 degrees, avoid putting the tungsten copper wire and iron, nickel, and carbon together. The tungsten copper wire must be placed in a dry place, and the relative humidity should not exceed 65% of the room temperature. Avoid placing it with acid or alkaline things.
• 2. After cleaning the tungsten copper wire, place it in a dry container to avoid direct contact with air to prevent oxidation [1].

Performance Purpose

Tungsten-copper composite material is a two-phase structure pseudo-alloy mainly composed of tungsten and copper elements. It is a metal-based composite material. Due to the large difference in physical properties between metallic copper and tungsten, it cannot be produced by melting and casting. Generally, powder alloys are used. Technology for production.

Tungsten-copper alloy has a wide range of uses, most of which are used in aerospace, aviation, electronics, electric power, metallurgy, machinery, sports equipment and other industries. Secondly, it is also used to manufacture high-temperature components such as the contacts of high-voltage electrical switches that are resistant to arc ablation, rocket nozzle throat linings, and tail rudders, as well as electrodes for electrical machining, high-temperature molds, and other applications that require electrical and thermal conductivity and high-temperature use. occasion.

Process Introduction

The process of preparing tungsten-copper alloy by powder metallurgy is powder-making-batching mixing-pressing forming-sintering infiltration-cold working.

Tungsten-copper or molybdenum-copper mixed powder is press-formed and then sintered in liquid phase at 1300-1500°. The material prepared by this method has poor uniformity and many closed voids. The density is usually less than 98%. However, ultra-fine and nano-powders are prepared by the activation sintering method with a small amount of nickel, mechanical alloying method or oxide supply reduction method It can improve the sintering activity, thereby increasing the density of tungsten-copper and molybdenum-copper alloys. However, nickel activation sintering will significantly reduce the electrical and thermal conductivity of the material, and the introduction of impurities in mechanical alloying will also reduce the conductivity of the material; the oxide co-reduction method to prepare powders is cumbersome in the process, low in production efficiency, and difficult to mass production.

Injection molding

High-density tungsten alloy is made by injection molding. The manufacturing method is to mix nickel powder, copper tungsten powder or iron powder with a uniform particle size of 1-5 microns, tungsten powder with a particle size of 0.5-2 microns and tungsten powder with 5-15 microns, and then mix in 25%-30 % Organic bonding agent (such as paraffin or polymethacrylate) is injected into the mold, removed to the binder by steam cleaning and irradiation, and sintered in hydrogen to obtain a high-density tungsten alloy.

Copper oxide powder method

Instead of using metal copper powder, copper oxide powder (mixed and ground to reduce to copper), copper forms a continuous matrix in the sintered compact, and tungsten serves as a strengthening framework. The high-expansion component is restricted by the surrounding second component, and the powder is sintered in wet hydrogen at a lower temperature. According to the introduction, the use of very fine powder can improve the sintering performance and densification, making it more than 99%.

Tungsten and molybdenum skeleton infiltration method

First, the tungsten powder or molybdenum powder is pressed into a shape, and sintered into a tungsten and molybdenum framework with a certain degree of porosity, and then copper is infiltrated. This method is applicable to tungsten copper, molybdenum copper products with low copper content. Compared with tungsten copper, molybdenum copper has the advantages of small quality, easy processing, linear expansion coefficient, thermal conductivity and some main mechanical properties equivalent to tungsten copper.

Although the heat resistance is not as good as tungsten copper, it is better than some heat-resistant materials, so the application prospect is better. Because the wettability of molybdenum-copper is worse than that of tungsten-copper, especially when preparing molybdenum-copper with a low copper content, the density of the material after infiltration is low, resulting in the material’s airtightness, electrical conductivity, and thermal conductivity that cannot meet the requirements. Its application is restricted