Preparation process of molybdenum/palladium/silver layered metal matrix composites

Abstract

The invention relates to a preparation process of a molybdenum / palladium / silver laminar metal matrix composite. The preparation process comprises the steps of pretreating a molybdenum metal foil, electroplating the surface of the molybdenum metal with palladium, annealing a molybdenum / palladium electroplating sample, carrying out dehydrogenation treatment, electroplating the surface of a molybdenum / palladium laminar annealed and dehydrogenized sample with silver, annealing a molybdenum / palladium / silver electroplating sample under pressure, and carrying out scanning electron microscope observation on the section morphology of the molybdenum / palladium / silver laminar metal matrix composite and resistance spot welding tensile strength testing. The preparation process has the beneficial effects that metallurgical bonding is achieved on the molybdenum / palladium and palladium / silver interfaces by diffusing the molybdenum / palladium and palladium / silver interfaces, so that the molybdenum / palladium / silver laminar metal matrix composite with good weldability and high interface bonding strength is obtained; the welding tensile strength of the composite during single resistance spot welding of the composite and solar cells is 416gf and exceeds the welding strength index stipulated in the national military standard GJB2602-1996.

Description

technical field [0001] The invention relates to a preparation and preparation process of a molybdenum / palladium / silver layered metal-based composite material. Background technique [0002] Molybdenum and molybdenum alloys have excellent heat resistance, high temperature mechanical properties, low thermal expansion coefficient and high thermal conductivity. Among them, the low thermal expansion coefficient and high thermal conductivity make molybdenum and molybdenum alloys very resistant to thermal shock, and their thermal response is very low after being made into a structure. In addition, molybdenum is not ferromagnetic. Because of these characteristics, molybdenum and molybdenum alloys have been widely used in aerospace and microelectronic equipment, such as antennas for space vehicles, blades of radar magnetron resonant cavity, etc. [0003] The problem with using molybdenum and molybdenum alloys is that the solderability of molybdenum is relatively poor, and the conduc...

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Problems solved by technology

At the same time, the annealing and dehydrogenation process was added to solve the hydrogen absorption problem of palladium metal, and the pressure annealing method was used to solve the problem of interface damage and delamination caused by the large difference in the thermal expansion coefficient of molybdenum / palladium, and the molybdenum / palladium / silver layered The metal matrix composite material meets the performance requirements, improves the weldability and conductivity of molybdenum metal, and the welding strength of the prepared molybdenum / palladium / silver layered metal matrix composite material and the space gallium arsenide solar cell resistance spot welding reaches Meets the requirements of the national military standard GJB2602-1996, and can be used to manufacture solar cell array interconnects

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