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A kind of tungsten carbide-chromium carbide-nickel-molybdenum composite powder, coating and preparation method thereof

A technology of composite powder and chromium carbide, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problem of poor cavitation resistance, weak bonding strength of coating film base and high temperature oxidation resistance, and corrosion resistance. In order to improve the strength and wear resistance, improve the high temperature oxidation resistance, and achieve high densification

Active Publication Date: 2021-07-20
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

However, compared with coatings prepared by electroplating hard chromium and anodic oxidation techniques, tungsten carbide-chromium carbide-nickel molybdenum coatings have weak corrosion resistance, especially in environments containing nitrate ions and hydrofluoric acid; and in turbulent flow , In the turbulent seawater environment, the cavitation resistance of the tungsten carbide-chromium carbide-nickel molybdenum coating is poor; at the same time, the bonding strength and high temperature oxidation resistance of the tungsten carbide-chromium carbide-nickel molybdenum coating are relatively weak

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] WC powder with a particle size of 0.5-1 μm and Cr with a particle size of 0.5-1 μm are used 3 C 2 Pure Ni metal powder with a particle size of 0.5-1 μm and pure Mo powder with a particle size of 0.5-1 μm are added to the powder, and rare earth oxide La with a purity of not less than 99.9% 2 o 3 , the particle size is 20-40nm, and the mass fraction of each component is WC: 68wt%, Cr 3 C 2 : 20wt%, Ni: 6wt%, Mo: 5wt%, La 2 o 3 : 1 wt%. And the powder is mixed in a ball mill for 20 hours to realize the homogenization of the composite powder, and then the composite powder is obtained through a spray drying method, and the particle size is 5-30um.

[0021] Lay the composite powder flat and put it in an electric drying oven for drying. The holding temperature is 105° C. and the drying time is 3 hours.

[0022] Clean the surface of the 0Cr13Ni5Mo stainless steel sprayed substrate with acetone, and dry it in an incubator at 60°C to remove the oil on the surface. Use the ...

Embodiment 2

[0026] WC powder with a particle size of 0.5-1 μm and Cr with a particle size of 0.5-1 μm are used 3 C 2Pure Ni metal powder with a particle size of 0.5-1 μm and pure Mo powder with a particle size of 0.5-1 μm are added to the powder, and rare earth oxide La with a purity of not less than 99.9% 2 o 3 , the particle size is 20-40nm, and the mass fraction of each component is WC: 64wt%, Cr 3 C 2 : 22wt%, Ni: 7.2wt%, Mo: 6wt%, La 2 o 3 : 0.8wt%. And the powder is mixed in a ball mill for 25 hours to realize the homogenization of the composite powder, and then the composite powder is obtained through a spray drying method, and the particle size is 5-30um.

[0027] Lay the composite powder flat and put it in an electric drying oven for drying. The holding temperature is 105° C. and the drying time is 3 hours.

[0028] Clean the surface of the Q345NH weathering steel sprayed substrate with acetone, and dry it in an incubator at 60°C to remove the oil on the surface. Use the c...

Embodiment 3

[0032] WC powder with a particle size of 0.5-1 μm and Cr with a particle size of 0.5-1 μm are used 3 C 2 Pure Ni metal powder with a particle size of 0.5-1 μm and pure Mo powder with a particle size of 0.5-1 μm are added to the powder, and rare earth oxide La with a purity of not less than 99.9% 2 o 3 , the particle size is 20-40nm, and the mass fraction of each component is WC: 67.5wt%, Cr 3 C 2 : 18wt%, Ni: 8wt%, Mo: 6wt%, La 2 o 3 : 0.5wt%. And the powder is mixed in a ball mill for 30 hours to realize the homogenization of the composite powder, and then the composite powder is obtained through a spray drying method, and the particle size is 5-30um.

[0033] Lay the composite powder flat and put it in an electric drying oven for drying. The holding temperature is 105° C. and the drying time is 3 hours.

[0034] Clean the surface of the 0Cr13Ni5Mo stainless steel sprayed substrate with acetone, and dry it in an incubator at 60°C to remove the oil on the surface. Use t...

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Abstract

The invention discloses a tungsten carbide-chromium carbide-nickel-molybdenum composite powder, a coating and a preparation method thereof. The composite powder is calculated by mass percentage, and its composition is WC: 64-74%, Cr 3 C 2 : 15-35%, Ni: 1-9%, Mo: 1-9%, La 2 o 3 : 0.1 to 1.5%. The above-mentioned composite powder can be sprayed with supersonic atmospheric flame to prepare the coating on the substrate, the thickness of the coating is 100-450 μm, the porosity of the coating is <0.5%; the microhardness of the coating is >1200HV 0.2 ; The bonding strength between the coating and the substrate is ≥75MPa, and it has the characteristics of wear resistance, corrosion resistance and cavitation resistance, which can meet the actual engineering needs of higher requirements.

Description

technical field [0001] The invention relates to a tungsten carbide-chromium carbide-nickel-molybdenum composite powder and its coating, in particular to an anti-wear, anti-corrosion, anti-cavitation containing La 2 o 3 Tungsten carbide-chromium carbide-nickel-molybdenum composite powder, coating and preparation method thereof. Background technique [0002] The surface failure of mechanical parts is mainly caused by wear, corrosion, cavitation, etc., and will cause the parts to be scrapped in advance. Every year, hundreds of millions of economic losses such as time cost, resource waste, and environmental governance are caused. At present, in order to solve this problem, the most important way is to strengthen the surface of mechanical parts through surface treatment technology, such as anodizing the surface of aluminum alloy, spraying epoxy emery on the surface of alloy steel, electroplating hard chrome, etc. However, the anti-wear ability of the anodized surface is not go...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/02B22F1/00C23C4/129C23C4/06
CPCB22F1/0003C22C29/02C23C4/06C23C4/129
Inventor 陈小明张凯刘德有赵坚伏利毛鹏展
Owner MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST
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