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Precursor carbonization plasma cladding reaction synthesized WC reinforced metal based alloy coating and preparation

A technology of plasma cladding and alloy coating, applied in the field of material surface strengthening, can solve the problems of insignificant enhancement of coating performance, limiting the application and development of WC reinforced metal-based alloy coating, etc. The effect of a large contact area

Inactive Publication Date: 2013-11-06
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because W is not a strong carbide forming element, the reaction of other elements in the mixed powder with C during the cladding process will reduce the amount of WC generated, and the coating performance will not be significantly enhanced.
These all limit the application and development of WC reinforced metal-based alloy coatings.

Method used

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  • Precursor carbonization plasma cladding reaction synthesized WC reinforced metal based alloy coating and preparation
  • Precursor carbonization plasma cladding reaction synthesized WC reinforced metal based alloy coating and preparation
  • Precursor carbonization plasma cladding reaction synthesized WC reinforced metal based alloy coating and preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A WC reinforced metal-based alloy coating synthesized by precursor carbonization plasma cladding reaction, characterized in that the composition of each element in the mixed powder for synthesizing the coating is calculated by mass percentage: W is 28%, C is 2%, Cr is 9%, B is 1%, Si is 0.8%, Mo is 0.5%, and the rest is Fe; the thickness of this coating is 3.5mm, and the width of single-pass cladding layer is 7mm; this coating includes iron-based solid solution, WC, (Fe ,Cr,W) 7 C 3 、(Fe,Cr,W) 23 C 6 and Fe 3 W 3 C-Fe 4 W 2 C, coating section hardness 1300HV 0.1 , surface hardness 69HRC.

Embodiment 2

[0026] A WC reinforced metal-based alloy coating synthesized by precursor carbonization plasma cladding reaction, characterized in that, the composition of each element in the mixed powder for synthesizing the coating is calculated by mass percentage: W is 18.8%, C is 1.2%, Cr 10% for B, 1.2% for B, 1% for Si, 0.6% for Mo, and Fe for the rest; the thickness of this coating is 4.5mm, and the width of a single cladding layer is 10mm; this coating includes iron-based solid solution, WC, (Fe ,Cr,W) 7 C 3 、(Fe,Cr,W) 23 C 6 and Fe 3 W 3 C-Fe 4 W 2 C, coating section hardness 1200HV 0.1 , surface hardness 67HRC.

Embodiment 3

[0028] A WC reinforced metal-based alloy coating synthesized by precursor carbonization plasma cladding reaction, characterized in that the composition of each element in the mixed powder for synthesizing the coating is calculated by mass percentage: W is 10%, C is 1%, Cr B is 12%, B is 1.5%, Si is 1.1%, Mo is 0.8%, and the rest is Fe; the thickness of this coating is 4mm, and the width of single cladding layer is 9mm; this coating includes iron-based solid solution, WC, (Fe, Cr, W) 7 C 3 、(Fe,Cr,W) 23 C 6 and Fe 3 W 3 C-Fe 4 W 2 C, coating section hardness 1000HV 0.1 , surface hardness 64HRC.

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Abstract

The invention relates to a precursor carbonization plasma cladding reaction synthesized WC reinforced metal based alloy coating, which is characterized in that preparation of the coating combines precursor carbonization compounding, plasma cladding and reaction synthesis technologies. Specifically, the involved mixed powder comprises the following elements by mass: 10-30% of W, 0.5-2% of C, 9-12% of Cr, 1-1.5% of B, 0.8-1.1% of Si, 0.5- 0.8% of Mo, and the balance Fe, wherein the C is obtained by carbonization of a sucrose precursor at a low temperature and wraps the surface of the W powder. The coating has thickness of 2-5mm, the width of a single-channel cladding layer is 3-12mm, and the porosity is low. The coating is mainly based on an iron-based solid solution, WC, (Fe, Cr, W)7C3, (Fe, Cr, W)23C6, and Fe3W3C-Fe4W2C and other phases, the coating section hardness is 900-1650HV0.1, and the surface hardness is 60-70HRC. According to the invention, the problems of interfacial contamination, generation of a brittle phase and the like in the coating are improved, and also the production of the WC reinforced phase in the coating is substantially improved. The coating has excellent wear resistance and excellent corrosion resistance.

Description

[0001] technical field [0002] The invention relates to synthesis and preparation of a WC reinforced metal-based alloy coating by carbonization plasma cladding reaction of precursors on the surface of carbon steel, and belongs to the field of material surface strengthening. This technology is mainly used to prepare wear-resistant and corrosion-resistant coatings on the surface of metal parts, and can be applied to mining machinery, construction machinery and other fields. Background technique [0003] Abrasion is one of the three main failure modes of materials, and with the development of high-speed mechanical equipment, the requirements for the wear resistance of material surfaces are also getting higher and higher. Among the currently widely used surface strengthening and wear protection technologies, plasma cladding technology can obtain high-quality dense coatings that are metallurgically bonded to the substrate at a lower cost. Because WC ceramics have high hardness...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 周泽华丁莹王泽华易于江少群刘立群
Owner HOHAI UNIV
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