Novel hypersonic-speed high-enthalpy-value plasma gun and preparation process of WC-based composite coating layer

A technology of plasma spray gun and speed of sound, which is applied in metal material coating process, coating, molten spraying, etc., can solve the problems of shortened service life of electrodes, and achieve the effect of improving corrosion resistance, improving performance, and strong wear resistance

Pending Publication Date: 2018-06-15
MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the existing supersonic plasma spray guns increase the speed and temperature of the jet by increasing the operating current, and the service life of the electrodes will be greatly shortened as the current increases

Method used

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  • Novel hypersonic-speed high-enthalpy-value plasma gun and preparation process of WC-based composite coating layer
  • Novel hypersonic-speed high-enthalpy-value plasma gun and preparation process of WC-based composite coating layer
  • Novel hypersonic-speed high-enthalpy-value plasma gun and preparation process of WC-based composite coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Pretreatment

[0056] The surface of the substrate 0Cr13Ni5Mo stainless steel is cleaned with deionized water, acetone and alcohol degreasing, dried, and sand blasted (30 mesh white corundum sand, sand blast pressure 0.6MPa), after the treatment, the surface meets the cleanliness requirement of Sa3 .

[0057] 2. Preheat the substrate. After preheating, the surface temperature of the substrate is about 100°C.

[0058] 3. The WC10Co4Cr nano-coating was sprayed with a new type of ultra-high-speed high-enthalpy plasma, the angle between the spray gun and the surface of the substrate was 90°, the spraying distance was 160mm, and the moving speed of the spray gun was 800mm / s.

[0059] 4. The main process parameters are adjusted as follows: power: 80KW, argon flow: 410SCFH, nitrogen flow: 100SCFH, hydrogen flow: 70SCFH, powder feeding volume: 4RPM, spraying distance: 160mm.

[0060] 5. Spray 16 times, and the final thickness of the coating is 250μm.

[0061] 6. Coating p...

Embodiment 2

[0064] 1. Pretreatment

[0065] The surface of the substrate 0Cr13Ni5Mo stainless steel is cleaned with deionized water, acetone and alcohol degreasing, dried, and sand blasted (30 mesh white corundum sand, sand blast pressure 0.6MPa), after the treatment, the surface meets the cleanliness requirement of Sa3 .

[0066] 2. Preheat the substrate. After preheating, the surface temperature of the substrate is about 100°C.

[0067] 3. The WC12Co nano-coating is sprayed with a new type of ultra-high-speed high-enthalpy plasma, the angle between the spray gun and the surface of the substrate is 90°, the spraying distance is 160mm, and the moving speed of the spray gun is 800mm / s.

[0068] 4. The main process parameters are adjusted as follows: power: 95KW, argon gas flow: 410SCFH, nitrogen gas flow: 110SCFH, hydrogen gas flow: 80SCFH, powder feeding volume: 3RPM, spraying distance: 160mm.

[0069] 5. Spray 18 times, and the final thickness of the coating is 250μm.

[0070] 6. Coat...

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Abstract

The invention discloses a novel hypersonic-speed high-enthalpy-value plasma gun and a preparation process of a WC-based composite coating layer. The novel hypersonic-speed high-enthalpy-value plasma gun comprises a nozzle, a fixed ring, a shell 1, a shell 2, an integrator, a water dividing sleeve, an anode, a compressor, a water cooling sleeve, a spacer sleeve and a cathode, wherein the compressoris added between the cathode and the anode to enlarge the gap between the cathode and the anode. The novel hypersonic-speed high-enthalpy-value plasma gun and the preparation process disclosed by theinvention have the beneficial effects that the arc length is prolonged, simultaneously the stability of an arc can be improved, the speed of flame flow of plasma spraying is increased, and finally, the flame-flow speed can reach 6-7 Mach (2040-2380m/s); the coating layer powder is heated to be in a molten and semi-molten state in a high-speed flame, impacts the surface of a workpiece by a high speed, and is deposited to form a dense coating layer; based on the device and process provided by the invention, the WC-based coating layer with high deposition efficiency, high bonding strength, highhardness, low porosity, high abrasion resistance, high corrosion resistance and high wear resistance can be obtained and can be applied on the surfaces of the workpieces such as a water turbine, a water pump, a ball valve, a gate and a piston rod and the like.

Description

technical field [0001] The invention relates to the field of surface strengthening and remanufacturing, in particular to a novel supersonic high-enthalpy plasma spray gun and a preparation process of a WC-based composite coating. Background technique [0002] Wear and corrosion are the main failure forms of mechanical parts. The failure of parts seriously affects the normal operation of the machine and reduces the production efficiency. At the same time, the replacement of parts greatly increases the production cost. In order to improve the service life and performance of mechanical parts, people have adopted a series of surface engineering technologies, such as surface alloying, ion implantation, shot peening, thermal spraying, etc., to improve and enhance the wear resistance and corrosion resistance of the surface materials of parts. . However, these methods cannot fundamentally solve this key technical problem, and the existing problems are still very prominent. With th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/06
CPCC23C4/134C23C4/06
Inventor 陈小明伏利吴燕明赵坚周夏凉刘伟张磊毛鹏展马红海
Owner MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST
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