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Preparation method of in-situ WC-M7C3 composite carbide coating

A WC-M7C3, in-situ self-generating technology, used in the field of wear-resistant coatings, can solve the problems of precipitation and loss of material surface enhancement, and achieve the effect of prolonging the liquid phase time of the melt, good compatibility, and clean and pollution-free surface.

Active Publication Date: 2017-01-04
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the WC density is more than twice that of Fe, it is easy to precipitate in the iron-based melt and lose the reinforcement of the surface layer of the material; the additional WC particles are easily dissolved in the iron-based unsaturated melt, resulting in the precipitation and dissolution of the additional WC particles Precipitation of brittle M 6 C organization (such as Fe 2 W 4 C. Fe 3 W 3 C. Fe 4 W 2 C) etc.

Method used

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  • Preparation method of in-situ WC-M7C3 composite carbide coating
  • Preparation method of in-situ WC-M7C3 composite carbide coating
  • Preparation method of in-situ WC-M7C3 composite carbide coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Mix 35% W powder (W≥99.8%, particle size 100~150μm), 15% Cr 3 C 2 Powder (Cr≥83.5%; C≥12.5%; Si≤1.8%, particle size 150~250μm), 2% C powder (C≥98%, particle size 180~250μm), the balance is Fe-Ni self-fluxing alloy Powder (Ni=30%; Re=1%; Fe=69%, particle size 100~200μm) is dried and mixed evenly, and then loaded into the powder feeder; the substrate is preheated, and the preheating temperature is 200~250°C; The coating is prepared by plasma cladding process, and the process parameters are: arc current 80~95A; voltage 40~46V; mixed powder feeding speed 15~20g / min; ion gas flow 5~8L / min; powder feeding gas flow 3 ~5L / min; shielding gas flow rate 6~8L / min; cladding speed 55~65mm / min, heat the reaction molten pool with a high temperature ceramic fiber blanket while preparing the coating.

[0042] The resulting WC-M 7 C 3 Composite reinforced iron-based coatings were tested against T10 samples (Rockwell hardness HRC=63±1) on the M-2000 wear testing machine (pressure 300N,...

Embodiment 2

[0044] Mix 40% W powder (W≥99.8%, particle size 100~150μm), 17% Cr 3 C 2 Powder (Cr≥83.5%; C≥12.5%; Si≤1.8%, particle size 150~250μm), 2.5% C powder (C≥98%, particle size 180~250μm), the balance is Fe-Ni self-fluxing alloy Powder (Ni=30%; Re=1%; Fe=69%, particle size 100~200μm) is dried and mixed evenly, and then loaded into the powder feeder; the substrate is preheated, and the preheating temperature is 200~250°C; The coating is prepared by plasma cladding process, and the process parameters are: arc current 80~95A; voltage 40~46V; mixed powder feeding speed 15~20g / min; ion gas flow 5~8L / min; powder feeding gas flow 3 ~5L / min; shielding gas flow rate 6~8L / min; cladding speed 55~65mm / min, heat the reaction molten pool with a high temperature ceramic fiber blanket while preparing the coating.

[0045] The resulting WC-M 7 C 3 Composite reinforced iron-based coatings were tested against T10 samples (Rockwell hardness HRC=63±1) on the M-2000 wear testing machine (pressure 300...

Embodiment 3

[0047] Mix 45% W powder (W≥99.8%, particle size 100~150μm), 19% Cr 3 C 2 Powder (Cr≥83.5%; C≥12.5%; Si≤1.8%, particle size 150~250μm), 2.5% C powder (C≥98%, particle size 180~250μm), the balance is Fe-Ni self-fluxing alloy Powder (Ni=30%; Re=1%; Fe=69%, particle size 100~200μm) is dried and mixed evenly, and then loaded into the powder feeder; the substrate is preheated, and the preheating temperature is 200~250°C; The coating is prepared by plasma cladding process, and the process parameters are: arc current 80~95A; voltage 40~46V; mixed powder feeding speed 15~20g / min; ion gas flow 5~8L / min; powder feeding gas flow 3 ~5L / min; shielding gas flow rate 6~8L / min; cladding speed 55~65mm / min, heat the reaction molten pool with a high temperature ceramic fiber blanket while preparing the coating.

[0048] The resulting WC-M 7 C 3 Composite reinforced iron-based coatings were tested against T10 samples (Rockwell hardness HRC=63±1) on the M-2000 wear testing machine (pressure 300...

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Abstract

The invention relates to the field of wear resistant coating especially to a method for preparing in-situ WC-M7C3 composite reinforced iron-based wear-resistant coating. The method is proportional mixing the alloy powder of W, Cr3c, C and Fe-Ni and then loading into powder feeder. Then preheating coated substrate with Oxyacetylene flame, preparing coating by plasma cladding process and using high temperature ceramic fiber to cool the coating pool. When in-situ WC and M7C3 in coatings of this invention grow multiply, the WC particles with high density can be distributed uniformly without precipitation; WC particles are sharp without dissolution phenomenon.

Description

technical field [0001] The invention relates to the field of wear-resistant coatings, in particular to an in-situ self-generated WC-M 7 C 3 A method for preparing a composite reinforced iron-based wear-resistant coating. Background technique [0002] The hardness of WC (tungsten carbide) is 2100~2400HV, which is similar to that of diamond. It is the main raw material of cemented carbide and is widely used in the production of superhard cutting tools, rock drilling tools, drilling tools, metal molds, etc. m 7 C 3 (Composite carbide, M=Fe, Cr) has a hardness of 1200~1800HV, and is the main strengthening phase of high-chromium iron-based wear-resistant materials, and is widely used in industries with extreme wear conditions such as mining, cement, and thermal power generation. In recent years, with the construction of major projects such as large-scale water conservancy projects, high-speed railways, and large-scale affordable housing projects in my country, the vigorous de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 袁有录
Owner CHINA THREE GORGES UNIV
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