Surface treatment process of molybdenum foil for spaceflight interconnection piece

Abstract

The invention provides a surface treatment process of molybdenum foil for a spaceflight interconnection piece. The process comprises the steps of degreasing, acid pickling, alkali washing, nickel-chromium alloy plating, silver plating, packaging and the like. The surface treatment process adopts the reasonable pretreatment step so as to effectively remove oil grease and an oxide layer on the surface of the molybdenum foil; a highly-vacuum electron beam evaporation coating technology is adopted so that secondary oxidation of the molybdenum foil can be effectively avoided and the thickness of a coating film can be controlled accurately; a nickel-chromium alloy layer is adopted as a buffering layer so that the mechanical performance and thermal performance of workpieces can be effectively improved; bonding force between the nickel-chromium alloy layer and the molybdenum foil can be effectively enhanced through highly-vacuum annealing treatment of the nickel-chromium alloy layer; and meanwhile, the process is simple in operation, low in cost and capable of meeting the requirements for mass treatment of products.

Description

technical field [0001] The invention belongs to the technical field of material surface treatment, in particular to a surface treatment process of molybdenum foil for aerospace interconnection sheets. Background technique [0002] Most spacecraft use solar-battery batteries as the power system, and during light periods, the solar array converts solar energy into electrical energy to provide electrical energy for the spacecraft's electrical loads while charging the battery pack. The solar cell array is actually composed of a certain number of solar cells connected in series and parallel, and these cells are assembled on the battery board in an orderly manner to generate electricity by the photoelectric effect. Because the panels need to be stretched and angled, the interconnects between them and the spacecraft must have a series of excellent electrical, mechanical, thermal, and corrosion resistance properties. At present, the aerospace interconnection sheet mainly uses molyb...

AI Technical Summary

Problems solved by technology

At present, molybdenum foil is mainly used for aerospace interconnection sheets, but because spacecraft are often affected by various complex environmental factors such as high-altitude radiation, meteorites, ultra-high temperature, and ultra-low temperature during orbital flight, in order to enhance the conductivity of molybdenum foil and wide-range To improve its damage resistance, the molybdenum foil material must be surface treated, that is, coated with a layer of protective metal silver. However, the bonding force between the silver plating layer and the molybdenum foil as the substrate is very poor, and there is a problem of thermal expansion coefficient mismatch. , the interface is easy to crack, thus failing