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Preparation of molybdenum copper alloy 

1) liquid-phase sintering method: copper tungsten copper or molybdenum After pressing the mixed powder, liquid phase sintering at 1300-1500 °. This material is prepared by the uniformity of the legal system is not good, there are more closed the gap, the density is usually less than 98%, but by adding a small amount of nickel-activated sintering, mechanical alloying or oxide reduction method for ultra-fine, nano powder can improve the sintering activity, thereby increasing tungsten copper, molybdenum copper alloy density. However, electrical conductivity, thermal conductivity material nickel-activated sintering causes a significant reduction, mechanical alloying introducing impurities also reduce material conductivity; oxide powders were prepared by reduction, process cumbersome, low productivity, it is difficult to mass production. 

 

2) tungsten, molybdenum skeleton infiltration method: first molybdenum powder or tungsten powder pressing and sintering the tungsten and molybdenum skeleton having a porosity and infiltration of copper. This method is suitable for low copper content of tungsten copper, molybdenum copper products. Compared with tungsten and copper molybdenum copper, with a small mass, easily processed, linear expansion coefficient, thermal conductivity and mechanical properties of some of the major copper and tungsten considerable advantages. Although the heat resistance of less than tungsten and copper, but better than some of the current heat-resistant materials, and therefore a better prospect. Wettability due to molybdenum-copper, especially when low copper content of molybdenum copper preparation, lower than the difference between tungsten and copper infiltrated the material density, resulting in airtight materials, electrical conductivity, thermal conductivity, can not meet the requirements, its application is limited.

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