High-temperature oxygen-free copper-316L stainless steel layered composite material and preparation process thereof

Abstract

The invention discloses a high-temperature oxygen-free copper-316L stainless steel layered composite material and a preparation process thereof. The composite material is of a three-layer layered structure; the three layers are oxygen-free copper, pure nickel and 316L stainless steel in sequence; the total thickness is 0.1 mm-0. 5mm; the thickness of the oxygen-free copper accounts for 25%-75% of the total thickness; the thickness of the pure nickel accounts for 0.5% of the total thickness; and the balance is the 316 stainless steel. According to the preparation process, the pure nickel is adopted as a boundary layer, the oxygen-free copper and the 316L stainless steel are compounded in a two-time hot rolling compounding mode, and a copper-nickel and nickel-iron transition layer is formed through diffusion heat treatment. The oxygen-free copper-316L stainless steel layered composite material prepared by the process is very high in interface strength, can be used at a high temperature for a long time, especially at a high temperature of 800 DEG C or above, and is good in reliability.

Description

technical field [0001] The invention relates to a metal-based layered composite material and a preparation process, in particular to an oxygen-free copper-316L stainless steel layered composite material for high temperature and a preparation process. Background technique [0002] Oxygen-free copper has good electrical conductivity, and 316L stainless steel has good strength and corrosion resistance. The layered composite material formed by oxygen-free copper and 316L stainless steel has good electrical conductivity, high strength and corrosion resistance, so it is used in many Electronics, electrical appliances and military industries are widely used. At present, the production of oxygen-free copper and 316L stainless steel composite strips usually uses oxygen-free copper strips or plates and 316L strips or plates. After cleaning the surface, they are combined by cold rolling or hot rolling to form a layered composite material. The composite material is formed by softening ...

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Problems solved by technology

[0003] However, in some special fields, such as military industry and other fields, materials need to work at high temperatures above 800 degrees for a long time, and copper and steel are prone to interface delamination and other problems.

The main reason is that it is difficult to form interatomic diffusion between the copper and steel interface, and the interface is used at high temperature for a long time, the grain size of the copper layer grows, and there are differences in the thermal expansion coefficient and thermal stress of the two materials. Weak interface strength, leading to delamination of copper and stainless steel, resulting in premature failure

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