A preparation method for intermediate transition layer applied in vacuum diffusion welding

Abstract

The invention discloses a preparation method for an intermediate transition layer applied in vacuum diffusion welding, which is characterized in that it comprises the following steps: a. soaking parts in gasoline to obtain product A; b. cleaning product A to obtain product B; c. Use HNO 3 Pickling product B with solution to obtain product C, d, cleaning product C, obtaining product D, e, washing product D with HCl solution, obtaining product E, f, cleaning product E, obtaining product F, g, cleaning product F with alcohol, Get product G, h, dry product G, get product H, i, preheat product H in a vacuum environment, get product I, j, clean product I with Hall source, get product J, k, ion bombard product J , so that the J product is activated to obtain the K product, the l and K products are pre-coated to obtain the L product, and the m and L products are coated to obtain the finished product. The intermediate transition layer prepared by the invention has the advantage of high purity, which can make the welding quality of the structural parts good; it also has the advantage of being easy to fit closely and evenly with the welding surface of the deep curved surface, and can also make the welding quality of the structural parts good.

Description

technical field [0001] The invention belongs to the field of vacuum welding diffusion welding, and in particular relates to a preparation method for an intermediate transition layer applied in vacuum diffusion welding. Background technique [0002] In modern engineering applications, the performance requirements of structural parts are getting higher and higher. In order to meet the performance requirements of structural parts, it is often necessary to connect two parts of different materials and performance differences, such as two parts of different metal materials. , or metal parts and ceramic parts are connected together, however, it is difficult to achieve the above connection using traditional fusion welding, vacuum diffusion welding, one of the special welding methods, is an effective way for the above connection. Before vacuum diffusion welding, it is necessary to prepare an intermediate transition layer on the welding surface of the parts, and the quality of the int...

AI Technical Summary

Problems solved by technology

The electroplating film method and the chemical plating film method are prepared by chemical methods. The film layer prepared as the intermediate transition layer inevitably contains metal impurities, the purity is low, and the thickness is thin. The quality of the intermediate transition layer is poor. To a certain extent The welding quality of structural parts will be poor; the pure nickel foil method can be used for diffusion welding between planes, but for parts whose welding surface is a deep curved surface, it is difficult to achieve a close and uniform fit between the nickel foil and the welding surface, and the intermediate transition layer The poor quality of the structure will also make the welding quality of the structural parts poor

[0003] Therefore, the intermediate transition layer prepared by the existing preparation method has the defect of containing metal impurities, which will make the welding quality of the structural parts poor; or has the defect that it is difficult to closely and evenly fit the welding surface of the deep curved surface, which will also make the welding quality of the structural parts poor.

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