Cavitation-erosion-resistant laser re-melting method of metal ceramic coating through thermal spraying

A cermet coating and laser remelting technology, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problem of difficult to achieve cavitation resistance, pure WC coating microporosity, coating hardness is not good Good and other problems, to achieve the effect of solving the defects of micropores and microcracks, good bonding, and excellent anti-cavitation performance

Inactive Publication Date: 2020-01-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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Problems solved by technology

However, the CrFeAlTiC coating material used in the final coating has poor hardness, and it is difficult to achieve better cavitation resistance.
[0007] Tungsten carbide (WC) has a very high hardness, which is beneficial to improve the cavitation resistance of the coating, but the melting point of WC particles is too high, and

Method used

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  • Cavitation-erosion-resistant laser re-melting method of metal ceramic coating through thermal spraying
  • Cavitation-erosion-resistant laser re-melting method of metal ceramic coating through thermal spraying
  • Cavitation-erosion-resistant laser re-melting method of metal ceramic coating through thermal spraying

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Embodiment 1

[0042] In this embodiment, the substrate material is 316 stainless steel, and the steps of preparing a cavitation-resistant coating on its surface include:

[0043] (1) Use ethanol to clean the dirt on the surface of the substrate on the surface of 316 stainless steel. After drying, use 80 mesh brown corundum sand to roughen the surface of the substrate. The air pressure of sandblasting is 0.6MPa, and the blasting time is 60 seconds. Its roughness meets the requirements of spraying;

[0044] (2) The cermet composite coating is prepared by thermal spraying on the substrate after sandblasting: WC powder and nickel powder are used as raw materials, and the volume ratio of WC powder and nickel powder is 45:55, which is formed on the surface of the substrate by supersonic flame spraying Metal-ceramic composite coating with a thickness of about 0.2-0.3mm, parameter settings: the gas is propane, the gas flow is 50-60L / min, the oxygen flow is 80-90L / min, the carrier gas is argon or ni...

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Abstract

The invention relates to the technical field of cavitation-erosion-resistant coatings, and discloses a method for preparing a cavitation-erosion-resistant coating through a thermal spraying and laserre-melting compound technology. The method comprises the following steps that (1) a metal ceramic composite coating is prepared on a matrix through thermal spraying; and (2), laser re-melting treatment is carried out on the metal ceramic composite coating obtained in the step (1), the surface of the metal ceramic coating is re-melted to form a new structure under high-density energy of lasers, thestructure property of the coating is enhanced after cooling, and the cavitation erosion resistance of the coating can be greatly improved. The method effectively eliminates the problem that ceramic powder deposits on the surface of the matrix through direct laser cladding, the obtained coating is low in porosity, the surface is compact and smooth, the cavitation erosion resistance is excellent, the coating can be widely applied to propellers, water turbine blades and other equipment prone to cavitation damage, the service life of the equipment can be prolonged, the frequency of maintaining the equipment due to cavitation damage is greatly reduced, and the using efficiency of the equipment is improved.

Description

technical field [0001] The invention relates to the technical field of cavitation-resistant coatings, in particular to a laser remelting method for cavitation-resistant thermal sprayed cermet coatings. Background technique [0002] Cavitation erosion is referred to as cavitation erosion, also known as cavitation erosion. Cavitation erosion refers to the formation and collapse of cavitation caused by local pressure changes in the liquid medium under the condition of high-speed multiphase flow. Seriously, the material is continuously impacted by high-pressure and high-speed micro-jet, causing damage to the surface of the metal. In this way, the protective film on the metal surface will be damaged to a certain extent, and the metal particles will be torn to a certain extent. On the surface of the metal, there will be cracks on the surface of the metal, corrosion will occur, and finally the metal surface will become dense and deep. The holes are rough in appearance. Metal cavi...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/02C23C4/134C23C4/129C23C4/137C23C4/18C22C29/08
CPCC22C29/067C22C29/08C23C4/02C23C4/06C23C4/129C23C4/134C23C4/137C23C4/18
Inventor 陈秀勇田野张波涛黄晶所新坤刘奕李华
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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