Diffusion brazing connecting method for contact reaction of magnesium alloy and steel

A technology of contact reaction and connection method, which is applied in the direction of welding/welding/cutting objects, welding equipment, metal processing equipment, etc., and can solve the problem of unsatisfactory interface bonding strength and other problems
CN104084658AInactive Publication Date: 2014-10-08山东高熵金属科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
山东高熵金属科技有限公司
Publication Date
2014-10-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a diffusion brazing connecting method for a contact reaction of magnesium alloy and steel, and belongs to the field of dissimilar material connection. The melting point of the magnesium alloy is 650 DEG C only, and the magnesium alloy is sensitive to the welding temperature. Magnesium and steel are dissimilar materials. Particularly, the melting points and the linear expansion coefficients of the two dissimilar materials remarkably differ from each other, so that the welding difficulty of the magnesium and the steel is increased. The diffusion brazing connecting method comprises the steps that an intermediate pure copper layer is manufactured on the surface of the magnesium alloy, so that the magnesium alloy / Cu / steel brazing structure is formed in a combined mode; the magnesium alloy / Cu / steel brazing structure is fixedly arranged inside a vacuum diffusion furnace, the pressure of junction surfaces ranges from 0.0375 MPa to 0.2 MPa, the magnesium alloy / Cu / steel brazing structure is heated, the temperature of the magnesium alloy / Cu / steel brazing structure is kept constant, then, the magnesium alloy / Cu / steel brazing structure is reheated, the temperature of the magnesium alloy / Cu / steel brazing structure is kept constant, heating is stopped, the magnesium alloy / Cu / steel brazing structure is cooled with the furnace until the temperature of the magnesium alloy / Cu / steel brazing structure is smaller than 150 DEG C, and diffusion brazing connection of the contact reaction of the magnesium alloy and the steel is achieved. According to the diffusion brazing connecting method, the welding temperature is lower, the influence on the parent metal is small, no brazing filter metal is needed, the large surrounding and small surrounding phenomena are avoided, the aim that no defects (relative fusion welding) exist in brazing joints of welding of the magnesium alloy and the dissimilar metal is achieved to a certain degree, and the shearing strength of the brazing joints at indoor temperature can reach 39.6 MPa.
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Description

technical field

[0001] The invention belongs to the technical field of connection of dissimilar materials, and in particular relates to a contact reaction diffusion brazing connection method of magnesium alloy and steel. Background technique

[0002] Magnesium alloy is currently the lightest metal structural material in practical application, and is called "green engineering and environmental protection material in the 21st century". Because it has a small density (only 1.74g / cm 3 ), high specific strength and specific stiffness, good shock absorption and anti-magnetic properties, easy cutting and recycling and other advantages, it has extremely important application value in industrial fields such as automobiles, electronics, electrical appliances, transportation, aviation, aerospace and national defense. and outlook. However, the application of magnesium alloys will inevitably encounter problems with the connection with steel, so it is particularly urgent to develop effi...

Claims

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