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Method for avoiding large difference of thermal expansion coefficient between high-melting-point metal film and base material

A high melting point metal, thermal expansion coefficient technology, applied in metal material coating process, melt spraying, coating and other directions, can solve the shrinkage rate, thermal stress and porosity of metal solid continuous film, large difference in thermal expansion coefficient, High melting point metal is difficult to melt and other problems, to avoid the large difference in thermal expansion coefficient, the surface is dense, and the operation is simple and convenient

Inactive Publication Date: 2019-05-21
张端雅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the arc spraying process is used to directly spray the high-melting point metal film on the surface of the substrate material, due to the large difference in thermal expansion coefficient between the two, and the high melting point metal is difficult to melt, it is difficult to control the working parameters, and then the prepared metal is solid and continuous. The shrinkage rate, thermal stress and porosity of the film are relatively large, and the solid continuous film is easily deformed, and defects such as warping, cracking and peeling occur on the surface of the substrate material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Surface treatment of the base material: use stainless steel as the base material, and use corundum with a particle size of 100 μm to carry out sandblasting and polishing on its surface. The sandblasting process is: sandblasting pressure 0.4MPa, sandblasting distance 10mm, Sandblast at an angle of 90°, then place them in an ultrasonic oscillator filled with ether and water for 10 minutes and 5 minutes, respectively, and take them out and dry them for later use;

[0017] (2) Acetylene-oxygen flame spraying intermediate layer: use linear polyethylene plastic with a diameter of 5 mm as the spraying material, and use the acetylene-oxygen spraying process to spray a layer of polyethylene intermediate layer on the stainless steel surface after the above treatment at 150 °C;

[0018] (3) Grinding treatment of the surface of the intermediate layer: After the above-mentioned polyethylene intermediate layer is cured at room temperature for 6-12 hours, the surface is polished wi...

Embodiment 2

[0021] (1) Surface treatment of the base material: take cast iron as the base material, and use corundum with a particle size of 80 μm to carry out sandblasting and polishing on its surface. The sandblasting process is: sandblasting pressure 0.45MPa, sandblasting distance 10mm, Sandblast at an angle of 90°, then place them in an ultrasonic oscillator filled with ether and water for 10 minutes and 5 minutes, respectively, and take them out and dry them for later use;

[0022] (2) Acetylene-oxygen flame spraying intermediate layer: use linear polypropylene plastic with a diameter of 10-15mm as the spraying material, and use the acetylene-oxygen spraying process to spray a layer of polymer on the cast iron surface after the above treatment at 160-180°C. Propylene middle layer;

[0023] (3) Grinding treatment of the surface of the intermediate layer: after the above-mentioned polyethylene intermediate layer is cured at room temperature for 6-12 hours, the surface is polished with ...

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Abstract

The invention discloses a method for avoiding large difference of thermal expansion coefficient between high-melting-point metal film and base material. The high-melting-point metal film comprises a substrate layer, a middle layer and a metal layer. The method includes the following steps that (1) the surface treatment of the substrate material is performed; (2) the middle layer is sprayed with acetylene-oxygen flame; (3) grinding treatment is performed on the surface of the middle layer; and (4) a high-melting metal solid continuous film is sprayed with electric arc. The thickness of the solid continuous film prepared through the method is 2-5 mm. According to the method for avoiding large difference of thermal expansion coefficient between high-melting-point metal film and base material,the preparation procedures are reasonable, operation is simple and convenient, the problem of large difference of the thermal expansion coefficient between the high-melting-point metal and the base material can be effectively avoided, the surface of the prepared high-melting-point metal film is compact, combination with the middle layer and the substrate is firm, no defects such as warping and cracking occur, the thickness is large, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of metal solid continuous films, in particular to a method for avoiding a large difference in thermal expansion coefficient between a high-melting point metal film and a base material. Background technique [0002] The solid continuous film materials used in the high melting point metal film are rare metals, which have the advantages of high hardness, good heat resistance, corrosion resistance, etc., and are widely used in industry. The preparation of metal solid continuous film by arc spraying has the advantages of simplicity, convenience and high forming efficiency, and is a method widely used in the technical field of metal solid continuous film preparation. However, when the arc spraying process is used to directly spray the high-melting point metal film on the surface of the substrate material, due to the large difference in thermal expansion coefficient between the two, and the high melting point metal...

Claims

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Application Information

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IPC IPC(8): C23C4/129C23C4/131C23C4/04C23C4/08
Inventor 张端雅
Owner 张端雅
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