Method for quantitatively characterizing carbide loss in chrome carbide metal ceramic coating prepared by thermal spraying

Abstract

The invention discloses a method for quantitatively characterizing carbide loss in a chrome carbide metal ceramic coating prepared by thermal spraying, and discloses a method for quantitatively characterizing the carbide loss caused by oxidation, melting and rebound in the process of preparing the chrome carbide metal ceramic coating by thermal spraying based on experiments. The method is simple and easy to implement, and can quickly, flexibly and conveniently quantitatively characterize the carbide loss at different stages in the process of thermally spraying the chrome carbide metal ceramic coating. The method provides a research method and theoretical support for quantitatively characterizing the rule of influence of spraying technological conditions on the carbide loss in the process of forming the chrome carbide metal ceramic coating through thermal spraying, optimizing the coating structure and spraying technological parameters, and preparing the high wear-resistant metal ceramic coating.

Description

technical field

[0001] The invention relates to a quantitative characterization method for carbide loss in the preparation of chromium carbide cermet coatings by thermal spraying, and is especially suitable for quantitative characterization of the carbide loss mechanism in the process of preparing chromium carbide cermet coatings by thermal spraying. Background technique

[0002] Most of the thermal spraying flames are high temperature and oxidizing atmosphere. During the process of thermal spraying carbide cermet coating, there are losses caused by oxidation and instantaneous rebound of carbide particles colliding with the substrate. The wear performance of cermet coatings is closely related to the size, content and distribution of carbides. Studies have shown that the content of carbide particles in the thermal sprayed chromium carbide cermet coating is significantly lower than that in the original spray powder, and the carbide particles are lost due to oxidation, melting ...

Examples

example 1

[0033] Example 1: Prepare Cr3C2-NiCr cermet coating for concrete supersonic flame spraying (HVOF), select Cr3C2-NiCr cermet powder for use, the mensuration of oxygen content has used the RO-316 type pulse heating coulomb oxygenation that U.S. Leco company produces instrument. The carbon content was determined by using the LS-344 infrared absorption carbon and sulfur analyzer produced by American Leco Company. The experimental results are as follows: in the original powder C P 8.48%, the oxygen flow rate is 447L / min, the gas flow rate is 45.8L / min, and the spraying distance is 210mm, C S 6.79%, C W is 8.32%, obtaining ΔC Y 0.17%, ΔC R 1.52%, Δf CMW 16.73%, Δf CRW 13%, Δf CYW was 1.27%. .

example 2

[0034]Example 2: Prepare Cr3C2-NiCr cermet coating for concrete supersonic flame spraying (HVOF), select Cr3C2-NiCr cermet powder for use, the mensuration of oxygen content has used the RO-316 type pulse heating coulomb oxygen that American Leco company produces instrument. The carbon content was determined by using the LS-344 infrared absorption carbon and sulfur analyzer produced by American Leco Company. The experimental results are as follows: in the original powder C P is 8.48%, the oxygen flow rate is 368L / min, the gas flow rate is 37L / min, and the spraying distance is 210mm, C S 6.54%, C W is 8.36%, using formula (1) to obtain ΔC Y is 0.12%, get ΔC R 1.82%, Δf CMW 12.95%, Δf CRW 14%, Δf CYW 0.9%. .

example 3

[0035] Example 3: Prepare Cr3C2-NiCr cermet coating for concrete supersonic flame spraying (HVOF), select Cr3C2-NiCr cermet powder for use, the mensuration of oxygen content has used the RO-316 type pulse heating coulomb oxygen that American Leco company produces instrument. The carbon content was determined by using the LS-344 infrared absorption carbon and sulfur analyzer produced by American Leco Company. The experimental results are as follows: in the original powder C P Under the conditions of 8.48%, oxygen flow rate of 447L / min, gas flow rate of 37L / min and spraying distance of 161.4mm, C S 6.13%, C W is 8.32%, get ΔC Y is 0.16%, using the formula (2) to obtain ΔC R was 2.19%. ΔC Y 0.16%, Δf CMW 10.83%, Δf CRW 17%, Δf CYW was 1.6%.

technical field

[0001] The invention relates to a quantitative characterization method for carbide loss in the preparation of chromium carbide cermet coatings by thermal spraying, and is especially suitable for quantitative characterization of the carbide loss mechanism in the process of preparing chromium carbide cermet coatings by thermal spraying. Background technique

[0002] Most of the thermal spraying flames are high temperature and oxidizing atmosphere. During the process of thermal spraying carbide cermet coating, there are losses caused by oxidation and instantaneous rebound of carbide particles colliding with the substrate. The wear performance of cermet coatings is closely related to the size, content and distribution of carbides. Studies have shown that the content of carbide particles in the thermal sprayed chromium carbide cermet coating is significantly lower than that in the original spray powder, and the carbide particles are lost due to oxidation, melting ...

Examples

example 1

[0033] Example 1: Prepare Cr3C2-NiCr cermet coating for concrete supersonic flame spraying (HVOF), select Cr3C2-NiCr cermet powder for use, the mensuration of oxygen content has used the RO-316 type pulse heating coulomb oxygenation that U.S. Leco company produces instrument. The carbon content was determined by using the LS-344 infrared absorption carbon and sulfur analyzer produced by American Leco Company. The experimental results are as follows: in the original powder C P 8.48%, the oxygen flow rate is 447L / min, the gas flow rate is 45.8L / min, and the spraying distance is 210mm, C S 6.79%, C W is 8.32%, obtaining ΔC Y 0.17%, ΔC R 1.52%, Δf CMW 16.73%, Δf CRW 13%, Δf CYW was 1.27%. .

example 2

[0034]Example 2: Prepare Cr3C2-NiCr cermet coating for concrete supersonic flame spraying (HVOF), select Cr3C2-NiCr cermet powder for use, the mensuration of oxygen content has used the RO-316 type pulse heating coulomb oxygen that American Leco company produces instrument. The carbon content was determined by using the LS-344 infrared absorption carbon and sulfur analyzer produced by American Leco Company. The experimental results are as follows: in the original powder C P is 8.48%, the oxygen flow rate is 368L / min, the gas flow rate is 37L / min, and the spraying distance is 210mm, C S 6.54%, C W is 8.36%, using formula (1) to obtain ΔC Y is 0.12%, get ΔC R 1.82%, Δf CMW 12.95%, Δf CRW 14%, Δf CYW 0.9%. .

example 3

[0035] Example 3: Prepare Cr3C2-NiCr cermet coating for concrete supersonic flame spraying (HVOF), select Cr3C2-NiCr cermet powder for use, the mensuration of oxygen content has used the RO-316 type pulse heating coulomb oxygen that American Leco company produces instrument. The carbon content was determined by using the LS-344 infrared absorption carbon and sulfur analyzer produced by American Leco Company. The experimental results are as follows: in the original powder C P Under the conditions of 8.48%, oxygen flow rate of 447L / min, gas flow rate of 37L / min and spraying distance of 161.4mm, C S 6.13%, C W is 8.32%, get ΔC Y is 0.16%, using the formula (2) to obtain ΔC R was 2.19%. ΔC Y 0.16%, Δf CMW 10.83%, Δf CRW 17%, Δf CYW was 1.6%.

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