High hardness and wear-resistant WC-17Co ceramet coating formed through H13 steel surface supersonic flame spraying

A metal-ceramic coating, supersonic flame technology, applied in metal material coating process, coating, fusion spraying and other directions, can solve the problems of low hardness, short service life of mold, poor wear resistance, etc. The effect of low coefficient, high production efficiency and cheap raw materials

Inactive Publication Date: 2019-01-04
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of H13 steel is low hardness and poor wear resistance, resulting in a shorter service life of the mold

Method used

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  • High hardness and wear-resistant WC-17Co ceramet coating formed through H13 steel surface supersonic flame spraying
  • High hardness and wear-resistant WC-17Co ceramet coating formed through H13 steel surface supersonic flame spraying
  • High hardness and wear-resistant WC-17Co ceramet coating formed through H13 steel surface supersonic flame spraying

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Experimental program
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Effect test

Embodiment 1

[0029] The preparation of embodiment 1, WC-17Co cermet coating

[0030] First, the size of H13 steel HVOF sprayed sample is Ф50×8mm, according to figure 1 Carry out finishing turning and longitudinal polishing. Next, use ethanol, use an ultrasonic cleaning machine to clean the oil on the surface of the H13 steel sample, and dry it for later use. Third, before HVOF spraying, the surface of H13 steel is pretreated by shot peening to improve the bonding strength between H13 steel substrate and HVOF coating. The technological parameters of shot peening are as follows: select ceramic shot, the distance between the nozzle and the H13 steel substrate is 200mm, the shot peening intensity is 0.3mmA, the spray angle is 90°, and the coverage rate is 100%. Finally, WC-17Co cermet composite coating was prepared on the surface of H13 steel by supersonic flame spraying process. The process parameters were: air flow rate 45L / min, oxygen flow rate 40L / min, propane flow rate 38L / min, powder f...

Embodiment 2

[0031] The preparation of embodiment 2, WC-17Co cermet coating

[0032] First, the size of H13 steel HVOF sprayed sample is Ф50×8mm, according to figure 1 Carry out finishing machining and longitudinal polishing treatment; secondly, use ethanol or acetone solution, use an ultrasonic cleaner to clean the oil stain on the surface of the H13 steel sample, and dry it for later use; thirdly, before the supersonic flame spraying, spray the H13 steel surface Shot pretreatment to improve the bond strength between H13 steel substrate and supersonic flame sprayed coating. The process parameters of shot peening are as follows: select ceramic shot, the distance between the nozzle and the H13 steel substrate is 200mm, the shot peening intensity is 0.3mmA, the spray angle is 90°, and the coverage rate is 100%. Prepare WC-17Co cermet overcoating on the steel surface. The process parameters are: air flow rate is 40L / min, oxygen flow rate is 35L / min, propane flow rate is 36L / min, powder feedi...

Embodiment 3

[0033] The preparation of embodiment 3, WC-17Co cermet coating

[0034] First, the size of H13 steel HVOF sprayed sample is Ф50×8mm, according to figure 1 Carry out finishing and polishing treatment; secondly, use ethanol or acetone solution, use an ultrasonic cleaner to clean the oil on the surface of the H13 steel sample, and dry it for later use; thirdly, spray the H13 steel surface Shot pretreatment to improve the bond strength between H13 steel substrate and supersonic flame sprayed coating. The process parameters of shot peening are: select ceramic shot, shot peening intensity is 0.3mmA, the distance between nozzle and H13 steel substrate is 200mm, the spray angle is 90°, and the coverage rate is 100%. Prepare WC-17Co cermet coating on the steel surface, the process parameters are: air flow rate is 50L / min, oxygen flow rate is 45L / min, propane flow rate is 40L / min, powder feeding rate is 45g / min, spraying distance is 330mm, among which The particle size of the WC-17Co ...

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Abstract

The invention discloses a high-hardness wear-resistant WC-17Co ceramet coating formed through H13 steel surface supersonic flame spraying. The preparation method of the ceramet coating comprises the following steps: spraying the ceramet powder on the surface of the substrate by supersonic flame spraying to obtain the ceramet coating; the ceramet powder is tungsten carbide based ceramic powder; theceramet powder is WC-17Co ceramic powder. The preparation method of the ceramet coating has the advantages of low price, simple process, low cost and high production efficiency, and is beneficial toindustrial production. The WC-17Co ceramet coating can strengthen the surface of the H13 steel matrix, thereby prolonging the service life of various profile moulds prepared with H13, such as hot working dies.

Description

technical field [0001] The invention relates to a high-hardness and wear-resistant WC-17Co cermet coating coated by supersonic flame spraying on the surface of H13 steel. Background technique [0002] H13 steel (4Cr5MoSiV1) has good red hardness, high toughness and excellent thermal fatigue resistance, so it is widely used in hot forging dies, hot extrusion dies, die-casting dies and isothermal forging dies. However, the biggest disadvantage of H13 steel is low hardness and poor wear resistance, resulting in a shorter service life of the mold. In view of the fact that the main failure mode of the H13 mold is surface wear, starting from saving and reducing emissions, giving full play to the potential of material performance and maximizing economic benefits, surface strengthening treatment for H13 steel molds is the key to comprehensively improving the service life of H13 steel molds. Contents of the invention [0003] The purpose of the present invention is to provide a WC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/06C23C4/02
CPCC23C4/02C23C4/06C23C4/129
Inventor 刘大猛庞华黄黎谢辰
Owner TSINGHUA UNIV
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