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Fine-grained Molybdenum Copper Alloy Production

Molybdenum Copper is kind of a false alloy which is make of two immiscible metals molybdenum and copper, having many good performance , such as high electrical and thermal conductivity, low and adjustable thermal expansion coefficient, high temperature resistance, corrosion resistance, high strength and so on. It is widely used in electrical electronics, instrumentation, military, aerospace and other fields, primarily as a vacuum contact, conductive cooling components, instrumentation components, high temperature components of missile or rockets, high-temperature furnace cooled electrode tip, EDM electrodes be used in these fields. It has broad application prospects.

However, due to molybdenum and copper is immiscible, using conventional preparation process it is difficult to meet the higher requirements of new applications area. Through experiments using sol- spray drying - calcining - Hydrogen reduction method can produce good performance fine-grained molybdenum-copper alloy and to explore new application areas of molybdenum-copper alloy provides a prerequisite.

Fine-grained molybdenum copper alloy production processes are as follows:

1.Using ammonium paramolybdate (NH₄) 6Mo₇O₂₄·4H₂O and copper nitrate Cu (NO₃)· 3H₂O as raw material to make up sol by molybdenum 70%, copper 30% (mass fraction) ratio formulation.

2. The sol after spray dried to obtain a composite salt precursor powder.

3. Precursor powder after 450℃sintered, processing hydrogen reduction can obtain ultrafine molybdenum-copper composite powder.

4. The powder was pressed under 400MPa pressure into the sample blanks. And then pre-sintered the blanks at 850 ℃, after sintered and heat preservation can obtain molybdenum-copper alloy.

Experimental results show that the sintering temperature during the preparation, the time and the oxygen content of the powder has a great influence on the properties of the molybdenum copper alloy. Sintered at 1050 ~ 1200 ℃, the material can be quickly densification; heat preservation  for 60 minutes after sintering at 1050 ℃, the relative density of the alloy can reach more than 90%. And the size of grain is fine, fibrous tissue distribution, the tensile strength can reach 755MPa, elongation of 6.41%.

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