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Method for high speed flame spraying heat-resistant alloy on steel cast workpiece surface

A technology of high-speed flame spraying and workpiece surface, which is applied in the direction of coating, fusion spraying, metal material coating process, etc., to achieve the effect of easy operation, improved service life and compact structure

Inactive Publication Date: 2009-06-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After searching, there is no report about the method of spraying heat-resistant alloys, especially Ni-Cr alloys, on the surface of cast steel by high-speed oxygen-acetylene flame spraying

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A conical steel casting with a thickness of 40mm, the diameter of the upper bottom surface is 200mm, and the diameter of the lower bottom surface is 350mm. The chemical composition of the cast steel is calculated by weight percentage: C 0.20%, Mn 0.55%, Si 0.36%, S and P are less than 0.04% respectively, and the rest is Fe. The process steps of high-speed oxygen-acetylene flame spraying on the surface of cast steel are as follows:

[0025] (1) Sand blasting to clean the surface of steel castings to remove oil and rust.

[0026] (2) Grind the cast steel surface to be sprayed with a manual grinding wheel to expose a smooth and rough metal surface.

[0027] (3) Using a high-speed oxygen-acetylene flame spraying method, spray nickel-clad aluminum alloy powder with a thickness of 40 μm on the surface of the steel casting as a primer. The process parameters are: oxygen pressure 0.6MPaMPa, acetylene pressure 0.09MPaMPa, spraying distance 160mm, powder feeding rate 20g / min, s...

Embodiment 2

[0034] A cast steel plate with a thickness of 30mm and a length and width of 300mm×100mm. The chemical composition of the cast steel is calculated by weight percentage: C 0.35%, Mn 0.60%, Si 0.30%, S and P are less than 0.04% respectively, and the rest is Fe. A layer of heat-resistant alloy is sprayed on its surface by high-speed oxygen-acetylene flame spraying. The process steps are:

[0035] (1) Sand blasting to clean the surface of the cast steel plate to remove oil and rust.

[0036] (2) Grind the surface of the cast steel plate with a manual grinding wheel to expose a smooth and rough metal surface.

[0037] (3) Using a high-speed oxygen-acetylene flame spraying method, spray nickel-clad aluminum alloy powder with a thickness of 30 μm on the cast steel surface as a primer. The process parameters are: oxygen pressure 0.5MPa, acetylene pressure 0.07MPa, spraying distance 150m, powder feeding rate 20g / min, spraying angle 85°.

[0038] (4) Using a high-speed oxygen-acetylene...

Embodiment 3

[0043] A cast steel pipe with a thickness of 20mm, an outer diameter of 150mm and a length of 250mm. The chemical composition of the cast steel is calculated by weight percentage: C0.45%, Mn0.60%, Si0.35%, S and P are less than 0.05% respectively, and the rest is Fe. A layer of heat-resistant alloy is sprayed on the inner and outer surfaces of the cast iron pipe by high-speed oxygen-acetylene flame spraying. The process steps are:

[0044] (1) Carry out pretreatment and coarsening treatment to the cast steel workpiece surface before spraying; Said pretreatment refers to sandblasting or turning processing on the surface of the cast steel workpiece to be sprayed, to remove oil stains and rust on the cast steel surface; The above-mentioned roughening treatment refers to grinding the surface of cast steel with a manual grinding wheel to expose a smooth and roughened metal surface.

[0045] (2) Use the high-speed oxygen-acetylene flame spraying method to spray the primer layer on ...

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Abstract

The invention relates to a method of cast steel workpiece surface high speed flame plating fireproof alloy, comprising the steps: 1) pretreatment and roughening treatment are carried out on the surface of the cast steel workpiece; 2) a high speed oxygen-acetylene flame hot spray method is adopted to spray a priming coat on the surface of the cast steel workpiece; 3) working layers are sprayed on the surface of the cast steel workpiece by adopting the high speed oxygen-acetylene flame hot spray method, and 2-4 working layers are repeatedly sprayed by using the method and under the condition of the step 3). The parts prepared by the technique of cast steel workpiece surface high speed oxygen-acetylene flame plating fireproof alloy have higher inoxidability and thermal shock resistance, and can greatly prolong the service life of the cast steel workpiece. Meanwhile, the technology of the invention has the characteristics of simple and convenient operation, low cost and strong applicability, and is convenient for popularization and application.

Description

technical field [0001] The invention relates to a metal surface spraying technology, in particular to a method for spraying a heat-resistant alloy with a high-speed flame on the surface of a cast steel workpiece for improving the thermal shock resistance of the cast steel surface. Background technique [0002] In recent years, with the development and application of spraying technology, the technology of preparing coatings on material substrates has been widely used. Among them, oxygen-acetylene flame spraying has attracted attention because of its low cost, high spraying efficiency, easy operation and wide application range. However, conventional flame spraying uses an oxygen-acetylene flame to melt the alloy powder to be sprayed. There is no high-temperature and high-pressure combustion chamber for oxygen and fuel to burn in ordinary spray guns, and the combustion products are directly ejected from the mixing chamber, so the flame flow speed is slow. , The heat is not con...

Claims

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Application Information

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IPC IPC(8): C23C4/08C23C4/02C22C38/04C23C4/129
Inventor 李亚江王娟张永兰
Owner SHANDONG UNIV
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