A kind of Kovar/silver metal layered composite material for space and preparation method thereof
A composite material and metal layer technology, applied in metal rolling, metal rolling, metal processing equipment, etc., can solve the problems of uncontrollable electroplating quality, weak coating, poor compactness, etc., and achieve good space environment adaptability, reliability Good weldability and the effect of eliminating thermal stress
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[0029] figure 2 It is a schematic flowchart of the steps of the preparation method of the Kovar / silver metal layered composite material for space use provided by the embodiment of the present invention. refer to figure 2 , a method for preparing a Kovar / silver metal layered composite material for space, comprising:
[0030] S21, stacking the pretreated Kovar alloy foil and pure silver foil in the order of the pure silver foil, the Kovar alloy foil and the pure silver foil to form a combined blank with a "sandwich" structure;
[0031] S22. Carry out rolling composite connection of the combined blanks in a vacuum or an inert gas environment, wherein the rolling temperature is 500-850°C, the reduction rate is 10%-40%, and the rolling speed is 0.02m / s ~0.5m / s;
[0032] S23. After rolling and compounding the combined billets, further annealing treatment is carried out under an inert gas atmosphere, wherein the annealing temperature is 400-750°C, and the annealing time is 0.5-2...
Embodiment 1
[0037] The middle layer of the Kovar / silver metal layered composite material for space is made of Kovar alloy foil with a thickness of 50 μm, and the surface layer is made of pure silver foil with a thickness of 20 μm and a purity of 99.99%. The three layers are connected and bonded by hot pressing diffusion As a whole, the upper, middle and lower layers are connected by chemical bonds, and the space is made of Kovar / silver metal layered composite material and parallel resistance is used to weld the space gallium arsenide solar cells. The tensile strength of the solder joints is 6~8N, and The interface did not appear to fall off.
[0038] The operation of preparing Kovar / silver metal layered composite materials for space is as follows: Use isopropanol and semiconductor cleaning solution, namely 1# electronic cleaning solution, to remove oil stains on the surface of two silver foils with a thickness of 20 μm, and use 25 % hydrofluoric acid (HF) aqueous solution to remove the ox...
Embodiment 2
[0040] The middle layer of the Kovar / silver metal layered composite material for space is made of Kovar alloy foil with a thickness of 30 μm, and the surface layer is made of pure silver foil with a thickness of 20 μm and a purity of 99.99%. The three layers are connected and bonded by hot pressing diffusion As a whole, the upper, middle and lower layers are connected by chemical bonds, and the space is made of Kovar / silver metal layered composite material and parallel resistance is used to weld the space gallium arsenide solar cells. The tensile strength of the solder joints is 6~8N, and The interface did not appear to fall off.
[0041] The operation of preparing Kovar / silver metal layered composite materials for space is as follows: Use isopropanol and semiconductor cleaning solution, namely 1# electronic cleaning solution, to remove oil stains on the surface of two silver foils with a thickness of 20 μm, and use 25 % hydrofluoric acid (HF) aqueous solution to remove the ox...
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