Tungsten copper alloy is not only a pseudo alloy composed of tungsten and copper, but also a metal-based composite material. Because of its excellent physical and chemical properties, it is widely used in military, defense, aerospace, aviation, navigation, electronic devices, medical equipment and other fields. However, due to the large differences in the physical and chemical properties of tungsten and copper, they cannot be produced by the melting and casting method, and are generally produced by powder alloy technology.
Properties of tungsten copper
Since tungsten and copper are two incompatible metals, copper-tungsten alloy combines the advantages of tungsten and copper, mainly in that it has a smaller volume expansion coefficient, better wear resistance and corrosion resistance, and excellent The characteristics of electrical and thermal conductivity, and good high temperature resistance.
Tungsten copper production process
The technological process of preparing tungsten copper alloy by powder metallurgy: powdering-mixing of ingredients-pressing forming-sintering infiltration-cold working.
Representative products of tungsten copper
(1) Tungsten copper electrode: It is suitable for welding electrodes because of its good high temperature resistance, arc ablation resistance, high specific gravity and easy machining.
(2) Tungsten-copper alloy rod: it is refined by the process of static pressing, high-temperature sintering, and copper infiltration using the excellent metal properties of high-purity tungsten powder and the plasticity and high conductivity of high-purity copper powder. The composite material has the characteristics of good arc breaking performance, no softening at high temperature, high strength and high hardness.
(3) Tungsten copper electronic packaging sheet: It has both the low expansion characteristics of tungsten and the high thermal conductivity of copper. It is worth noting that the performance of the electronic packaging sheet can be changed by adjusting the ratio of the constituent materials.
(4) Tungsten copper tube: It is widely used in cemented carbide and insoluble metals. Because tungsten-copper alloy is easy to machine, the use of tungsten-copper tube plays a great role when the surface needs to be easy to cut and the inner diameter is small.
(5) Tungsten copper alloy wire: Precautions for its use: 1) Colloidal graphite cannot be placed on the surface of the tungsten copper wire; 2) When the temperature is above 1000 degrees, avoid putting the tungsten copper wire with iron, nickel and carbon together; 3 ) The tungsten copper wire must be placed in a dry place, and the relative humidity should not exceed 65% of room temperature. Avoid placing it with acid or alkaline things.
(6) Military high-temperature resistant materials: copper-tungsten alloy is used in aerospace for missiles, rocket engine nozzles, gas rudders, air rudders, and nose cones. The main requirements are high temperature resistance (3000K~5000K) and high temperature resistance to air erosion Ability, mainly using the sweat cooling effect formed by the volatilization of copper at high temperature (copper melting point 1083°C) to reduce the surface temperature of tungsten copper and ensure the use under extreme high temperature conditions