What is Molybdenum Copper Alloy?

Molybdenum copper alloy combines the advantages of copper and molybdenum, with high strength, high specific gravity, high temperature resistance, arc erosion resistance, good electrical and thermal conductivity, and good processing performance. It uses high-quality molybdenum powder and oxygen-free copper powder, and isostatic pressing (high-temperature sintering-copper infiltration) to ensure product purity and accurate ratio, fine structure, and excellent performance. It has good arc breaking performance, good electrical conductivity, good thermal conductivity, and small thermal expansion.

Manufacturing method：

Liquid phase sintering method: After the tungsten copper or molybdenum copper mixed powder is pressed and formed, it is liquid-phase sintered at 1300-1500°. The material prepared by this method has poor uniformity, 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, such as activated sintering, mechanical alloying, or oxide reduction, thereby improving the density of tungsten copper and molybdenum copper alloys. However, nickel activated sintering will significantly reduce the electrical and thermal conductivity of the material, and the introduction of impurities by mechanical alloying will also reduce the conductivity of the material; the oxide co-reduction method is used to prepare powder, the process is cumbersome, the production efficiency is low, and it is difficult to mass produce.

Tungsten and molybdenum skeleton infiltration method: first press tungsten powder or molybdenum powder into shape, and sinter it into a tungsten or molybdenum skeleton with a certain porosity, and then infiltrate copper. This method is suitable for tungsten copper and molybdenum copper products with low copper content. Compared with molybdenum copper, tungsten copper has the advantages of small mass, easy processing, linear expansion coefficient, thermal conductivity and some main mechanical properties comparable to tungsten copper. Although its heat resistance is not as good as tungsten copper, it is better than some heat-resistant materials, so its application prospects are good. 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 the material’s air tightness, electrical conductivity, and thermal conductivity not meeting the requirements, and its application is limited.