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Nickel-chromium/chromium carbide metal ceramic composite coating and preparation method thereof

A metal-ceramic composite, chromium carbide technology, applied in metal material coating process, coating, melt spraying and other directions, can solve problems such as wear and material loss

Pending Publication Date: 2021-07-06
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous advancement of science and technology, engineering equipment has played a vital role in human exploration of nature. Many of its parts have been working in corrosive media for a long time, and they are severely corroded and worn, resulting in large material losses.

Method used

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  • Nickel-chromium/chromium carbide metal ceramic composite coating and preparation method thereof
  • Nickel-chromium/chromium carbide metal ceramic composite coating and preparation method thereof
  • Nickel-chromium/chromium carbide metal ceramic composite coating and preparation method thereof

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preparation example Construction

[0030] A method for preparing a low-porosity, corrosion-resistant and wear-resistant nickel-chromium / chromium carbide cermet composite coating of the present invention comprises the following steps:

[0031] 1) Substrate surface pretreatment

[0032] First, use a grinding and polishing machine to polish the base material, generally 316L, to remove the surface oxide skin while ensuring the surface flatness of the base material;

[0033] Then use alcohol for ultrasonic cleaning to remove surface oil;

[0034] Finally, use 60-mesh white corundum for sandblasting. The sandblasting pressure is 0.6-0.65Mpa. After sandblasting, the surface is uniform, and the surface roughness is greater than 5 μm and less than 10 μm. After sandblasting, use compressed air to blow off the residual sand on the surface of the base material;

[0035] 2) dry powder

[0036] The prepared NiCr-Cr 3 C 2 Put the powder into a glass petri dish and spread the powder; will contain NiCr-Cr 3 C 2 Put the pe...

Embodiment 1

[0043] The preparation method of the low-porosity, corrosion-resistant and wear-resistant nickel-chromium / chromium carbide cermet composite coating comprises the following steps:

[0044] 1) Substrate surface pretreatment

[0045] First, the base material 316L was polished with a polishing machine to remove the surface oxide skin while ensuring the surface smoothness of the base material; then, ultrasonic cleaning was performed with alcohol to remove surface oil; finally, 60-mesh white corundum was used for sandblasting, and the sandblasting pressure was 0.6Mpa, the surface is uniform after sandblasting, and the surface roughness is 8μm. After sandblasting, use compressed air to blow off the residual sand particles on the surface of the base material;

[0046] 2) dry powder

[0047] The prepared NiCr-Cr 3 C 2Put the powder into a glass Petri dish, spread the powder flat, put it into a drying oven, set the drying temperature of the oven to 110°C for 4 hours, and remove exces...

Embodiment 2

[0054] The preparation method of the low-porosity, corrosion-resistant and wear-resistant nickel-chromium / chromium carbide cermet composite coating comprises the following steps:

[0055] 1) Substrate surface pretreatment

[0056] First, the base material 316L was polished with a polishing machine to remove the surface oxide skin while ensuring the surface smoothness of the base material; then, ultrasonic cleaning was performed with alcohol to remove surface oil; finally, 60-mesh white corundum was used for sandblasting, and the sandblasting pressure was 0.6Mpa, the surface is uniform after sandblasting, and the surface roughness is 8μm. After sandblasting, use compressed air to blow off the residual sand particles on the surface of the base material;

[0057] 2) dry powder

[0058] The prepared NiCr-Cr 3 C 2 Put the powder into a glass petri dish, spread the powder flat, put it into a drying oven, set the drying temperature of the oven to 100°C for 4 hours, and remove exce...

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Abstract

The invention provides a nickel-chromium / chromium carbide metal ceramic composite coating and a preparation method thereof. The preparation method comprises the following steps that 1, the surface of a base material is pretreated, and the base material with the flat surface and without oxide skin is obtained; 2, the base material obtained in the step 1 is subjected to sand blasting treatment and then preheated, and the pretreated base material is obtained; and 3, NiCr-Cr3C2 powder is used, the base material obtained in the step 2 is subjected to hypersonic flame spraying, the mass ratio of NiCr to Cr3C2 is 1:3, the spraying distance is 380-400 mm, and the powder feeding rate is 100-120 g / min. The nickel-chromium / chromium carbide metal ceramic composite coating is formed on the base material, and the coating is high in compactness, low in porosity, high in bonding strength and excellent in corrosion and wear resistance.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, in particular to a nickel-chromium / chromium carbide cermet composite coating and a preparation method thereof. Background technique [0002] With the continuous advancement of science and technology, engineering equipment has played a vital role in human exploration of nature. Many of its parts have been working in corrosive media for a long time, and they are severely corroded and worn, resulting in large material losses. [0003] Thermal spraying technology is more and more widely used in aerospace, petrochemical, iron and steel metallurgy, automobile shipbuilding and other fields. Thermal spraying nickel-chromium / chromium carbide (ie NiCr-Cr 3 C 2 ) coatings are mostly used in equipment parts under harsh working conditions because of their good wear resistance, oxidation resistance, and corrosion resistance. However, with the development of thermal spraying technology, a low w...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/129C23C4/02
CPCC23C4/06C23C4/129C23C4/02
Inventor 贾均红杨鑫然孙航蔡粮臣苟海龙
Owner SHAANXI UNIV OF SCI & TECH
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