Reinforcing method for bonding interface of MgFe compound casting

A technology that combines surface and interface, applied in the improvement of process efficiency, additive manufacturing, energy efficiency and other directions, can solve the problem of insufficient bonding strength of MgFe, and achieve the effect of strengthening metallurgical bonding and mechanical bonding, reliable connection, and mature technology.

Active Publication Date: 2018-10-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defect of insufficient MgFe bonding strength existing in the prior art, the present invention provides a method for strengthening the bonding interface of MgFe composite castings. The method uses selective laser melting technology to prepare Fe-based lattice materials on the bonding surface of iron-based materials, and then utilizes Liquid-solid composite casting process realizes the combination of iron-based materials and magnesium-gold

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The lattice material is 304 stainless steel, the type is pyramid, the rod length is 1.2mm, the rod diameter is 0.4mm, and the angle between the rods is 45°. Selected area laser melting molding process parameters: laser power 110W, scanning speed 650mm / s, spot diameter 60μm, powder layer thickness 0.02mm, scanning distance 80μm, using progressive scanning method to prepare Fe-based lattice materials.

[0026] The surface treatment of Fe-based lattice materials is as follows: use 65g / LNaOH, 22g / LNa 3 PO 4 , 23g / LNa 2 CO 3 , 5g / LNa 2 SiO 3 , surfactant 4mL / L, the rest is water, chemical degreasing; use 110g / LNaOH, 60g / LKMnO 4 , 90g / LNa 2 CO 3 , the rest is water, pickling at 85°C, and then passivation treatment with an aqueous solution of nitric acid with a volume ratio of 25% nitric acid at a solution temperature of 38°C for 33 minutes. Using copper sulfate (CuS0 4 5H 2 0) 16g / L, sodium potassium tartrate (NaKC 4 h 4 o 6 4H 2 O) 14g / L, EDTA 2Na 19.5g / L, nick...

Embodiment 2

[0029] The lattice material is 314 stainless steel, the type is tetrahedron, the length of the rod is 2mm, the diameter of the rod is 0.6mm, and the angle between the rods is 45°. Selected area laser melting molding process parameters Laser power 120W, scanning speed 300mm / s, spot diameter 65μm, powder layer thickness 0.025mm, scanning distance 90μm, using progressive scanning method to prepare Fe-based lattice materials.

[0030] The surface treatment of Fe-based lattice materials is as follows: use 70g / L NaOH, 24g / L NaOH 3 PO 4 , 25g / L Na 2 CO 3 , 7g / LNa 2 SiO 3 , surfactant 5mL / L, the rest is water, chemical degreasing; using 120g / L NaOH, 70g / L KMnO 4 , 95g / LNa 2 CO 3 , the rest is water, pickling at 90°C, and then passivation treatment with a nitric acid aqueous solution with a volume ratio of 32% at a solution temperature of 30°C for 45 minutes. Using copper sulfate (CuS0 4 5H 2 0) 15g / L, sodium potassium tartrate (NaKC 4 h 4 o 6 4H 2 O) 16g / L, EDTA 2Na 19.5...

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Abstract

The invention discloses a reinforcing method for a bonding interface of an MgFe compound casting. The reinforcing method comprises the following steps: (1) preparing a Fe-based dot matrix material onthe bonding surface of a Fe-based material by adopting a selective laser melting technology; (2) processing the surface of the dot matrix material by adopting a chemical deoiling-pickling and passivating-chemical electroless copper plating process; and (3) fixing the Fe-based material in a cast, pouring a magnesium alloy melt in the cast, and carrying out ultrasonic oscillating treatment in the casting process to achieve firm bonding of Mg and Fe. Different from a conventional plane combining mode, the reinforcing method provided by the invention is high in bonding strength, the bonding interface is unlikely to fall, and firm bonding between Mg and Fe is achieved. In addition, no complicated equipment is needed, and parameters are easily controlled.

Description

technical field [0001] The invention relates to the strengthening technology of the bonding interface of composite castings, in particular to a strengthening method of the bonding interface of MgFe composite castings. Background technique [0002] Magnesium alloys have the advantages of low density, high specific strength, high specific stiffness, high damping and easy recycling. However, magnesium alloys have disadvantages such as poor corrosion resistance, high-temperature strength, and creep resistance, which affect their wider applications. Iron-based materials are the most widely used structural materials in industry today, with excellent strength, wear resistance and low cost. [0003] Magnesium alloys and iron-based materials are highly complementary in performance. In some environments, the composite structure of the two can overcome the shortcomings of a single material while retaining their respective performance characteristics, which can effectively reduce the w...

Claims

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Application Information

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IPC IPC(8): B22D19/16B22F3/105B22D27/08
CPCB22D19/0081B22D19/16B22D27/003B22D27/08B22F10/00B22F10/62B22F10/28B22F10/68Y02P10/25
Inventor 赵建华张劲永叶未王敬丰上官晶晶闻福林
Owner CHONGQING UNIV
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