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Nickel-chromium-chromium carbide composite powder, coating and preparation method thereof with high temperature resistance, wear resistance, corrosion resistance and cavitation resistance

A composite powder, chromium carbide technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of poor anti-cavitation protection effect, inability to meet the requirements of use, weak corrosion resistance, etc. Improved corrosion and cavitation resistance, good solid solution strengthening, high corrosion resistance

Active Publication Date: 2018-05-29
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 electroplating hard chromium, electroplating NiP, anodic oxidation, etc., the corrosion resistance of nickel-chromium-chromium carbide coatings is relatively weak, especially in some strong corrosive media, such as chloride ions, nitrate ions and other environments. Corrosion resistance is weak, unable to meet the needs of higher use requirements
At the same time, in the turbulent and turbulent water environment, the anti-cavitation protection effect of nickel-chromium-chromium carbide is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Cr powder with a particle size of 5~45μm is used 3 C 2 Ceramic powder, NiCr alloy powder with a particle size of 5-45 μm, pure Nb metal powder with a particle size of 10-55 μm and pure Ta powder with a particle size of 10-55 μm are used as spraying materials, of which Cr 3 C 2 : 70wt%, NiCr: 23wt%, Nb: 3.5wt%, Ta: 3.5wt%. And the powder was mixed in a ball mill for 12 hours to realize the homogenization of the composite powder.

[0022] Lay the composite powder flat and put it in an incubator for drying. The holding temperature is 75°C and the drying time is 3 hours.

[0023] Clean the surface of the 0Cr13Ni5Mo stainless steel sprayed substrate with acetone, and dry it in an incubator at 40°C to remove the oily dirt on the surface. It was blasted using the aerodynamic blasting method described above.

[0024] The composite powder in this example is sprayed by supersonic flame, the kerosene flow rate is 27L / h, the kerosene pressure is 1.6MPa, the oxygen flow rate is...

Embodiment 2

[0027] Cr powder with a particle size of 5~45μm is used 3 C 2 Ceramic powder, NiCr alloy powder with a particle size of 5-45 μm, pure Nb metal powder with a particle size of 10-55 μm and pure Ta powder with a particle size of 10-55 μm are used as spraying materials, of which Cr 3 C 2 : 75wt%, NiCr: 20wt%, Nb: 1.5wt%, Ta: 3.5wt%. And the powder was mixed in a ball mill for 15 hours to realize the homogenization of the composite powder.

[0028] Lay the composite powder flat and put it in an incubator for drying. The holding temperature is 85°C and the drying time is 2.5 hours.

[0029]Clean the surface of the ZG06Cr13Ni4Mo stainless steel spray-coated substrate with alcohol, and dry it in an incubator at 45°C to remove oil stains on the surface. Sandblasting is carried out in the manner described above.

[0030] The composite powder in this example is sprayed with high-enthalpy plasma, the power of the spray gun is 85kW, the flow rate of argon gas is 250SCFH (cubic feet pe...

Embodiment 3

[0033] Cr powder with a particle size of 5~45μm is used 3 C 2 Ceramic powder, NiCr alloy powder with a particle size of 5-45 μm, pure Nb metal powder with a particle size of 10-55 μm and pure Ta powder with a particle size of 10-55 μm are used as spraying materials, of which Cr 3 C 2 : 85wt%, NiCr: 12wt%, Nb: 2wt%, Ta: 1wt%. And the powder was mixed in a ball mill for 14 hours to realize the homogenization of the composite powder.

[0034] Lay the composite powder flat and put it in an incubator for drying. The holding temperature is 90°C and the drying time is 2 hours.

[0035] Clean the surface of the 0Cr13Ni5Mo stainless steel spray-coated substrate with alcohol, and dry it in an incubator at 50°C to remove oil stains on the surface. Sandblasting is carried out in the manner described above.

[0036] The composite powder in this example is sprayed by supersonic flame spraying, the kerosene flow rate is 28L / h, the kerosene pressure is 1.7MPa, the oxygen flow rate is 880...

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Abstract

The invention discloses high-temperature resisting, abrasion resisting, corrosion resisting and cavitation resisting nickel-chromium-chromium carbide composite powder and a high-temperature resisting, abrasion resisting, corrosion resisting and cavitation resisting nickel-chromium-chromium carbide coating prepared through the composite powder. The composite powder comprises, by weight percentage, 65-85% of Cr3C2, 10-25% of NiCr, 1-5% of Nb and 1-5% of Ta. The coating is prepared in the manner that the composite powder is subjected to hypersonic flame spraying or high-enthalpy plasma spraying or is subjected to hypersonic flame spraying or high-enthalpy plasma spraying, and then the high-enthalpy plasma remelting technology is combined. The coating is greatly improved in the aspects of microhardness, combing strength, corrosion resistance and cavitation resistance. Meanwhile, the production cost is low, the preparing method is reliable in technology, performance is stable, and the coating is suitable for being applied to the fields such as hydraulic machine flow passage components, compressor screws and turbine blades on a large scale.

Description

technical field [0001] The invention relates to a nickel-chromium-chromium carbide composite powder and its coating, in particular to a nickel-chromium-chromium carbide composite powder containing Nb and Ta which are resistant to high temperature, wear, corrosion and cavitation, and its coating and coating. its preparation method. Background technique [0002] Wear, corrosion, cavitation, etc. are the main reasons for the surface failure of mechanical workpieces, which in turn lead to premature scrapping of many mechanical parts, resulting in huge economic losses and waste of resources. In order to improve the anti-corrosion, anti-wear and anti-cavitation ability of the surface of mechanical workpieces, the surface treatment technology is mainly used to strengthen the surface, such as electroplating hard chrome on the surface of piston rod alloy steel, anodic oxidation on the surface of aluminum alloy materials, and coating on the surface of stainless steel of water turbines...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/129C23C4/134
CPCC23C4/06
Inventor 吴燕明陈小明周夏凉赵坚方勇毛鹏展伏利
Owner MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST
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