Process method for diffusion bonding of titanium / copper dissimilar materials and improvement of strength and plasticity of joint

By filling the joint surface of the titanium/copper heterogeneous material with short carbon fibers and friction stir treatment, combined with vacuum diffusion connection and low temperature tempering treatment, the problems of low strength and poor plasticity of the joints are solved, and the strong plasticity of the joints are achieved synergistic improvement.

CN119703319AActive Publication Date: 2025-03-28HARBIN INST OF TECH
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Patent Information

Application Number
CN202510041592.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-10
Publication Date
2025-03-28
Estimated Expiration
2045-01-10

AI Technical Summary

Technical Problem

The current direct diffusion connection joints of titanium/copper heterogeneous materials have low strength and poor plasticity, resulting in brittle fracture failure in the joint under high temperature conditions.

Method used

By processing grooves on the to-welded surfaces of copper and titanium workpieces and filling them with short carbon fibers, combined with friction stir surface treatment, a composite fibrotic surface is formed, followed by vacuum diffusion connections, and multiple low-temperature tempering treatments are performed to improve the strong plasticity of the joints.

Benefits of technology

The synergistic improvement of the strength and plasticity of the diffusion connection joint of titanium/copper heterogeneous materials is achieved, reducing the generation of hard and brittle Ti-Cu intermetallic compounds, extending the crack transmission path of joint failure, and improving the overall performance of the joint.

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Abstract

The invention discloses a process method for diffusion bonding of titanium / copper dissimilar materials and improvement of strength and plasticity of a joint, and aims to solve the problems of low strength and poor plasticity of a direct diffusion bonding joint of the titanium / copper dissimilar materials at present. The process method for improving the strength and plasticity of the joint comprises the following steps of: 1, processing a groove or an array groove on a to-be-welded surface of at least one of a copper workpiece and a titanium workpiece, and filling short carbon fibers or crystal whiskers into the groove or the array groove of the workpiece; secondly, the to-be-welded face of the copper workpiece and / or the titanium workpiece is subjected to stirring friction surface treatment through a stirring friction head; thirdly, vacuum diffusion bonding is carried out at the temperature of 550-900 DEG C; and 4, performing low-temperature tempering treatment. The short carbon fibers are distributed in the random direction of the titanium / copper diffusion bonding interface to form a zigzag interface structure form, the crack propagation path in the joint failure process is prolonged, and the plasticity of the joint is improved; and the strength of a joint is improved by a pinning strengthening mechanism of carbon fiber dispersed distribution on a material tissue at an interface.
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