75/25 W80 Cu20 WCu Walfram Copper Alloy Rods Tungsten Copper Alloy Bar

Product Description

75/25 W80 Cu20 WCu Walfram Copper Alloy Rods Tungsten Copper Alloy Bar

Walfram Copper Alloy Rods Tungsten Copper Alloy Bar is an alloy composed of tungsten and copper.The copper content of common alloys is 10% ~ 50%. The alloy is made by powder metallurgy, which has good conductivity, good high temperature strength and certain plasticity. At very high temperatures, such as above 3000 ℃, copper in the alloy is liquefied and evaporated, which absorbs a lot of heat and reduces the surface temperature of the material. Therefore, this kind of material is also called metal sweating material.

classification

Due to the immiscibility of tungsten and copper, tungsten copper alloy has low expansion, wear resistance, corrosion resistance of tungsten and high conductivity and thermal conductivity of copper, and is suitable for various machining. Tungsten copper alloy can be produced and processed according to the user's requirements. Tungsten copper alloys generally use the process flow of powder metallurgy, first powder making - batching mixing - pressing forming - sintering infiltration [1].

Tungsten copper electrode

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

Tungsten copper alloy rod

Tungsten copper is a composite material refined by the process of static pressure forming, 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 conductivity, small thermal expansion, no softening at high temperature, high strength, high density and high hardness.

Tungsten copper electronic package

Tungsten copper electronic packaging material: it not only has the low expansion characteristics of tungsten, but also has the high thermal conductivity of copper. Its thermal expansion coefficient and 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 cemented carbide and insoluble metals. Because tungsten copper alloy is easy to machine, the application of tungsten copper pipe plays a great 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 ℃, avoid putting tungsten copper wire together with iron, nickel and carbon. The tungsten copper wire must be kept dry, and the relative humidity shall not exceed 65% of the room temperature. It shall not be placed with acid or alkaline things.

2. After cleaning the tungsten copper wire, put it in a dry vessel to avoid direct contact with air and prevent oxidation

Walfram Copper Alloy Rods Tungsten Copper Alloy Bar Picture:

performance

Tungsten Copper Alloy Bar Tungsten copper composite is a two-phase structure pseudoalloy mainly composed of tungsten and copper elements. It is a metal matrix composite. Due to the large differences in physical properties between copper and tungsten, it can not be produced by melting and casting method, but generally produced by powder alloy technology.

WCu Walfram Copper Alloy Rods Tungsten Copper Alloy Bar has a wide range of applications, most of which are used in aerospace, aviation, electronics, electric power, metallurgy, machinery, sports equipment and other industries. Secondly, it should also be used to manufacture the contacts of high-voltage electrical switches resistant to arc ablation and high-temperature components such as rocket nozzle throat lining and tail rudder. It should also be used as electrodes for electrical machining, high-temperature molds and other occasions requiring conductivity and high-temperature use.

Process introduction

The technological process of preparing W-Cu alloy by powder metallurgy is powder making - proportioning and mixing - pressing forming - sintering and infiltration - cold working.

Tungsten copper or molybdenum copper mixed powder is pressed and sintered in liquid phase at 1300-1500 °. The material prepared by this method has poor uniformity, there are many closed voids, and the density is usually less than 98%. However, the sintering activity can be improved by adding a small amount of nickel to prepare ultrafine and nano powders by activation sintering method, mechanical alloying method or oxide reduction method, so as to improve the density of W-Cu and Mo-Cu alloys. However, nickel activated sintering will significantly reduce the conductivity and thermal conductivity of the material, and the introduction of impurities by mechanical alloying will also reduce the conductivity of the material; The preparation of powder by oxide co reduction method is cumbersome, inefficient and difficult to mass produce.

Injection molding method

High density tungsten alloy was prepared by injection molding. The manufacturing method is to mix nickel powder, copper tungsten powder or iron powder with uniform particle size of 1-5 microns with tungsten powder with particle size of 0.5-2 microns and tungsten powder with particle size of 5-15 microns, then mix 25% - 30% organic bonding agent (such as paraffin or polymethacrylate vinegar) for injection molding, remove the adhesive by steam cleaning and irradiation, and sinter in hydrogen to obtain high-density tungsten alloy.

Copper oxide powder method

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

Tungsten and molybdenum skeleton infiltration method

Firstly, tungsten powder or molybdenum powder is pressed and sintered into tungsten and molybdenum skeleton with certain porosity, and then copper is infiltrated. This method is suitable for tungsten copper, molybdenum copper products with low copper content. Compared with tungsten copper, molybdenum copper has the advantages of small mass, 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 it has a good application prospect. Because the wettability of molybdenum copper is worse than that of tungsten copper, especially when preparing molybdenum copper with low copper content, the density of the material after infiltration is low, resulting in that the air tightness, conductivity and thermal conductivity of the material can not meet the requirements, and its application is limited.

Material properties

Tungsten copper alloy combines the advantages of copper and tungsten, high strength, high specific gravity, high temperature resistance, arc ablation resistance, good electrical conductivity and processing performance. It adopts high-quality tungsten powder and oxygen free copper powder, and applies isostatic pressing (high-temperature sintering copper infiltration) to ensure product purity and accurate ratio, fine structure and excellent performance. Good arc breaking performance, good conductivity, good thermal conductivity and small thermal expansion.

Main application

Tungsten copper alloy combines the advantages of metal tungsten and copper. Among them, tungsten has high melting point (tungsten melting point is 3410 ℃, copper melting point is 1080 ℃) and high density (tungsten density is 19.34g/cm3, copper density is 8.89g/cm3); Copper has excellent electrical and thermal conductivity, tungsten copper alloy (composition generally ranges from wcu7 to wcu50) has uniform microstructure, high temperature resistance, high strength, arc ablation resistance and high density; With moderate conductivity and thermal conductivity, it is widely used in military high-temperature resistant materials, electrical alloys for high-voltage switches, EDM electrodes and Microelectronic Materials. As parts and components, it is widely used in aerospace, aviation, electronics, electric power, metallurgy, machinery, sports equipment and other industries.

1, Military high temperature resistant materials

Tungsten copper alloy is used as nozzle, gas rudder, air rudder and nose cone of missile and rocket engine in aerospace. The main requirements are high temperature resistance (3000K ~ 5000K) and high temperature airflow scouring resistance. It mainly uses the sweating refrigeration effect formed by copper volatilization at high temperature (copper melting point 1083 ℃) to reduce the surface temperature of tungsten copper and ensure its use under extreme high temperature conditions.

2, Electrical alloy for high voltage switch

Tungsten copper alloy is widely used in high-voltage switch 128kv SF6 circuit breaker WCu / CuCr, high-voltage vacuum load switch (12kV 40.5kV 1000A) and lightning arrester. High voltage vacuum switch has small volume, easy maintenance and wide application range, and can be used in humid, flammable, explosive and corrosive environment. The main performance requirements are arc ablation resistance, fusion welding resistance, low cut-off current, low gas content and low hot electron emission capacity. In addition to the conventional macro performance requirements, porosity, microstructure and properties are also required. Therefore, special processes need to be adopted, such as vacuum degassing, vacuum infiltration and other complex processes.

3, EDM electrode

In the early stage of EDM, copper or graphite electrode was used, which is cheap but not resistant to ablation, and has been basically replaced by tungsten copper electrode. Tungsten copper electrode has the advantages of high temperature resistance, high temperature strength, arc ablation resistance, good conductivity and fast heat dissipation. Applications focus on electric spark electrode, resistance welding electrode and high voltage discharge tube electrode.

EDM electrodes are characterized by a wide variety of specifications, small batch and large amount. Tungsten copper materials as EDM electrodes should have as high density and structural uniformity as possible, especially slender rod, tubular and special-shaped electrodes.

4, Microelectronic Materials

Tungsten copper electronic packaging and heat sink materials not only have the low expansion characteristics of tungsten, but also have the high thermal conductivity of copper. Their thermal expansion coefficient and thermal conductivity can be changed by adjusting the composition of tungsten and copper, which provides a wider range of applications for tungsten and copper. Tungsten copper materials are widely used in semiconductor materials because of their high heat resistance, good thermal conductivity and thermal expansion coefficient matching with silicon wafer, gallium arsenide and ceramic materials. It is suitable for high-power device packaging materials, heat sink materials, heat dissipation elements, ceramics and GaAs bases.

Specifications of WCu Walfram Copper Alloy Rods Tungsten Copper Alloy Bar :