Method for preparing Al-Mg3Sb2 composite coating on surface of magnesium alloy

An al-mg3sb2, composite coating technology, applied in metal material coating process, coating, fusion spraying and other directions, can solve the problems of low high temperature strength, poor creep resistance, etc., achieve good thermal stability, phase The effect of high melting point and simple method

Inactive Publication Date: 2016-08-31
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for preparing Al-Mg on the surface of magnesium alloy 3 Sb 2 Composite coating method to overcome the defects of low high-temperature strength and poor creep resistance in the application of magnesium alloys, and adopt the method of the present invention to obtain a coating with good thermal stability on the surface of magnesium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Preparation of Al-Mg on the surface of magnesium alloy 3 Sb 2 Composite Coating Method

[0028] Include the following steps:

[0029] (1) Mix Mg powder and Sb powder evenly to obtain Mg-Sb mixed powder, wherein the mass percentage of Mg powder and Sb powder is 23%:77%; put the Mg-Sb mixed powder in a ball mill for ball milling, and the ball mill The mass ratio of balls to materials is 15:1, and the ball milling time is 10 hours to obtain Mg 3 Sb 2 Powder, Mg 3 Sb 2 The particle size of the powder is 15-25um;

[0030] (2) Mg obtained in step (1) 3 Sb 2 Powder mixed with Al powder with a particle size of 20-30um, Mg 3 Sb 2 The mass ratio of powder and Al powder is 0.2:1;

[0031] (3) Mg in step (2) 3 Sb 2 The mixed powder of powder and Al powder is added the polyvinyl alcohol aqueous solution that mass percent is 7%, the mass ratio of polyvinyl alcohol aqueous solution and mixed powder is 0.8:1;

[0032] (4) After the powder in step (3) is dried, i...

Embodiment 2

[0037] Example 2 Preparation of Al-Mg on the surface of magnesium alloy 3 Sb 2 Composite Coating Method

[0038] The difference with embodiment 1 is:

[0039] (1) The ball milling time after mixing Mg powder and Sb powder in step (1) is 12 hours;

[0040] (2) Mg in step (2) 3 Sb 2 The mass ratio of powder and Al powder is 0.5:1;

[0041] (3) The mass ratio of polyvinyl alcohol aqueous solution and mixed powder in step (3) is 0.9:1;

[0042] (4) The gas pressure for blasting the magnesium alloy surface in step (5) is 0.7MPa;

[0043] (5) The plasma spraying method is adopted in step (6), and the thickness of the coating is 0.2mm;

[0044] (6) Al-Mg in step (7) 3 Sb 2 The heating temperature of the composite coating is 280°C;

[0045] (7) Al-Mg in step (8) 3 Sb 2 The pressure of the press is 12MPa when the composite coating is hot-pressed.

Embodiment 3

[0046] Example 3 Preparation of Al-Mg on the surface of magnesium alloy 3 Sb 2 Composite Coating Method

[0047] The difference with embodiment 1 is:

[0048] (1) The ball milling time after mixing Mg powder and Sb powder in step (1) is 15 hours;

[0049] (2) Mg in step (2) 3 Sb 2 The mass ratio of powder and Al powder is 0.8:1;

[0050] (3) The mass ratio of polyvinyl alcohol aqueous solution and mixed powder in step (3) is 1:1;

[0051] (4) The gas pressure for blasting the magnesium alloy surface in step (5) is 0.8MPa;

[0052] (5) In step (6), the supersonic flame spraying method is adopted, and the thickness of the coating is 0.25 mm;

[0053] (6) Al-Mg in step (7) 3 Sb 2 The heating temperature of the composite coating is 300°C;

[0054] (7) Al-Mg in step (8) 3 Sb 2 The pressure of the press is 15MPa when the composite coating is hot-pressed.

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Abstract

The invention discloses a method for preparing an Al-Mg3Sb2 composite coating on the surface of magnesium alloy. After being mixed, Mg powder and Sb powder are ball-milled in a ball milling machine, so that Mg chemically reacts with Sb to form an Mg3Sb2 intermetallic compound, Mg3Sb2 powder and granulated Al powder are thermally sprayed to the surface of a magnesium alloy workpiece subjected to sandblasting treatment, and the Al-Mg3Sb2 composite coating is obtained; after the Al-Mg3Sb2 composite coating is heated, the coating is hot-pressed on a press machine. The Mg powder and the Sb powder have a solid-phase reaction in the ball milling process to generate the Mg3Sb2 intermetallic compound, Mg3Sb2 melting point is high, heat stability is good, dislocation movement can be effectively hindered, a substrate and a grain boundary are remarkably reinforced, and high-temperature mechanical properties and creep resistance of the workpiece are improved. Pores and layered structures in the thermally sprayed Al-Mg3Sb2 composite coating disappear in the hot press process because the composite coating plastically deforms and is compacted, compactness of the coating is remarkably improved, and the high-temperature mechanical properties and creep resistance are given full play to.

Description

technical field [0001] The invention relates to a method for preparing Al-Mg on the surface of magnesium alloy 3 Sb 2 A composite coating method belongs to the technical field of material engineering. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in practical application. It has the advantages of low density, high specific strength, damping, and good machinability. Due to cost reasons, it was only used as structural parts in the aerospace and communication fields. In recent years, in order to solve the problems of reducing energy consumption and environmental protection, the automotive industry has turned its attention to magnesium alloys to make them lightweight. Magnesium alloy can reduce vehicle weight and reduce fuel consumption. It has high specific strength and specific stiffness close to that of aluminum alloy and steel. It has good casting performance and dimensional stability, easy processing, low scrap rate, g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/134C23C4/02C23C4/08C23C4/18B22F9/04
CPCC23C4/02C23C4/08C23C4/18
Inventor 周小平
Owner HUBEI UNIV OF TECH
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