Preparation process of molybdenum/platinum/silver layered metal matrix composites for space vehicles

Abstract

The invention relates to a preparation technique for spacecraft-solar-cell-array-interconnection-sheet-used molybdenum / platinum / silver / layered metal matrix composite materials. The technique comprises the steps of pretreatment of Molybdenum metal foils, platinum plating of molybdenum metal surfaces, molybdenum / platinum electroplating sample annealing, silver electroplating of molybdenum / platinum layered annealing sample surfaces, annealing of molybdenum / platinum / silver electroplating samples, scanning electron microscope observation of molybdenum / platinum / silver layered metal matrix composite material surface morphologies, Auger spectroscopy analysis along the depth and resistor spot welding tensile strength testing. According to the invention, diffusion infiltrating happens in a molybdenum / platinum interface and a platinum / silver interface, so that metallurgical bonding is realized in the molybdenum / platinum interface and the platinum / silver interface, and relatively high interface bonding intensity is realized. The molybdenum / platinum / silver / layered metal matrix composite materials with the high interface bonding intensity and high welding tensile strength are obtained. The welding tensile strength of the molybdenum / platinum / silver / layered metal matrix composite materials when in spot welding with a solar cell single spot resistor is 324gf, and a welding strength index prescribed by China military standard GJB2602-1996 is exceeded.

Description

technical field [0001] The invention relates to a preparation process of a molybdenum / platinum / silver layered metal-based composite material for a space vehicle solar battery array interconnection sheet. Background technique [0002] The power supply system of space vehicles (including satellites, spacecraft and space stations, etc.) is composed of solar arrays as power generation devices, battery packs as energy storage devices, and power control devices required for power distribution systems. The solar array generates electricity during bright periods in Earth orbit, powering the spacecraft's electrical loads and charging the battery pack. [0003] The solar cell array is composed of a large number of solar cells, which are mounted on the solar panel in an orderly manner, and use the photoelectric effect of the solar cell to convert the incident sunlight radiation into electrical energy. Although each cell contributes a small current and voltage, a large number of cells ...

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Problems solved by technology

[0006] There are several difficulties in the preparation technology of molybdenum / platinum / silver layered composites: Although molybdenum-platinum is a solid solution system, there are five metal intermediate phases ( Comparing 6 Pt, Comparing 3 Pt, Comparing 3 Pt, Phase MoPt, Comparing 6 Pt 2 ), coupled with the extremely low surface activity of molybdenum foil, it is difficult to obtain a molybdenum / platinum bonding interface with high bonding strength and good plastic toughness; Although the platinum-silver system is a solid solution system, so far there has been considerable controversy over the phase diagram of platinum-silver binary alloys in the academic circles, which makes it difficult to confirm the reasonable microstructure and formulate the annealing process; The thermal expansion coefficients of molybdenum, platinum and silver metals are quite different (the thermal expansion coefficient of molybdenum is about 5.2 10 -6 / K -1 The thermal expansion coefficient of platinum is about 9.0 10 -6 / K -1 The coefficient of thermal expansion of silver is about 19.2 10 -6 / K -1 ), thermal stress is difficult to control

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