Spaceborne Kovar/silver metal laminated composite material and preparation method thereof

A composite material and metal layer technology, used in metal rolling, metal rolling, metal processing equipment and other directions, can solve the problems of uncontrollable electroplating quality, weak coating, poor compactness, etc. Good weldability and the effect of eliminating thermal stress

Active Publication Date: 2017-05-24
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of Kovar / silver metal layered composite material for space and preparation method thereof, to solve the problem that the metal layered composite material coating prepared by the existing Kovar electroplating silver is not firm, compactness is poor, weldability is poor, electroplating Problems such as uncontrollable quality and complicated process

Method used

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  • Spaceborne Kovar/silver metal laminated composite material and preparation method thereof
  • Spaceborne Kovar/silver metal laminated composite material and preparation method thereof

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preparation example Construction

[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 under an inert gas atmosphere, wherein the annealing temperature is 400-750°C, and the annealing time is 0.5-2h. Metal layer...

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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Abstract

The invention relates to a spaceborne Kovar / silver metal laminated composite material and a preparation method thereof. The composite material comprises a Kovar alloy foil piece and two pure silver foils, and is characterized in that the pure silver foils acting as surface layers and the Kovar alloy foil piece acting as an interlayer form a laminated sandwich structure, and the top, middle and bottom layers form chemical bonds through rolling and bonding so as to be connected into an integral whole. The preparation method comprises the steps of laminating the pure silver foils and the Kovar alloy foil piece into a combined blank with a sandwich structure according to a sequence of the pure silver foil, the Kovar alloy foil piece and the pure silver foil; performing hot rolling and composite bonding on the combined blank; performing further annealing processing at the atmosphere of an inert gas after rolling and bonding, and acquiring a spaceborne Kovar / silver metal laminated composite material after annealing processing. The composite material has good space environment adaptability, thermal conductivity, electrical conductivity and weldability, and meets requirements of space electronic packaging applications; and the spaceborne Kovar / silver laminated composite material is simple in production process, sable and controllable in quality, convenient to operate and capable of realizing large-area automatic roll-to-roll batch production.

Description

technical field [0001] The invention relates to the field of aerospace equipment and methods, in particular to a Kovar / silver metal layered composite material for space and a preparation method thereof. Background technique [0002] The development of space technology and the high cost of space launch put forward new requirements for the normal on-orbit operation life of spacecraft. Due to the harsh space environment, the effect on the surface materials of the spacecraft is complex and changeable. The solar cell array working on the surface of the spacecraft for a long time will be eroded by high-energy particles, micro-meteorites, space debris, atomic oxygen, etc., which will affect the normal life of the aircraft on orbit. . [0003] The solar cell array is an array formed by connecting single gallium arsenide solar cells in series through metal interconnections. At present, the interconnection metal materials used in space solar cell arrays are mainly pure silver inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/05H01L31/18B21B1/40B21B9/00B21B45/02B21B45/04B21B47/00
CPCB21B1/40B21B9/00B21B45/0269B21B45/04B21B47/00H01L31/0512H01L31/188Y02E10/50Y02P70/50
Inventor 范襄于振海陈萌炯池卫英雷刚徐建文沈斌吴庆
Owner SHANGHAI INST OF SPACE POWER SOURCES
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