A kind of preparation method of wear-resistant coating of liner of ball mill

A ball mill liner, wear-resistant coating technology, applied in the direction of coating, metal material coating process, fusion spraying, etc. Evenly organized effect

Active Publication Date: 2018-04-13
ANHUI POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is a relatively long process from redesigning the chemical composition of the matrix material to production to actual production practice

Method used

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  • A kind of preparation method of wear-resistant coating of liner of ball mill
  • A kind of preparation method of wear-resistant coating of liner of ball mill
  • A kind of preparation method of wear-resistant coating of liner of ball mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A wear-resistant coating for a liner of a ball mill, comprising a base and a coating layer, wherein the mass percentages of the base components are C0.30-0.44wt%, Si1.50-2.0wt%, Mn0.8-1.40wt%, Cr2 .0~2.8wt%, Mo≦0.3wt%, Ni≦0.3wt%, Re0.02wt%, P and S total 0.04wt%, the rest is Fe; the coating layer contains 97% WC- Co powder and 3% Cr, the Cr / Co weight ratio is 0.3; the WC-Co powder is evenly and discretely distributed in the coating.

[0069] A method for preparing a wear-resistant coating for a liner of a ball mill, the steps of which are as follows:

[0070] a. Surface preparation: first, the surface of the base material should be cleaned with alcohol or acetone to remove oil stains, and then the surface to be sprayed should be roughened by sandblasting;

[0071] b. Preheat treatment: preheat the surface of the substrate before spraying. The preheating temperature is 200-300°C and the time is 60s, which can reduce the internal stress caused by the temperature differen...

Embodiment 2

[0079] Adopt embodiment 1 method to react, and its difference is:

[0080] 1. A wear-resistant coating for a ball mill liner, the coating layer contains 98% WC-Co powder and 2% Cr by volume fraction, and the Cr / Co weight ratio is 0.2; the WC-Co The powder is uniformly and discretely distributed in the coating.

[0081] 2. In step d, use supersonic flame spraying technology to spray the ceramic working coating with a thickness of 250 μm on the surface of the parts where the coating layer is mixed with the powder mixed with the coating layer; the rest are the same as in Example 1.

[0082] Compared with Example 1, due to less Cr element, the decarburization and oxidation of WC cannot be completely suppressed, so the porosity of the obtained coating is relatively high, reaching 4.4%. Cr is a corrosion-resistant element. The presence of Cr element greatly promotes the formation of passivation film. The reduction of Cr element leads to the reduction of the self-corrosion potential...

Embodiment 3

[0084] Adopt embodiment 1 method to react, and its difference is:

[0085] 1. A method for preparing a ball mill liner wear-resistant coating, the coating layer contains 96% WC-Co powder and 4% Cr by volume fraction, and the Cr / Co weight ratio is 0.4; The WC-Co powder is uniformly and discretely distributed in the coating.

[0086] 2. In step d, use supersonic flame spraying technology to spray a ceramic working coating with a thickness of 275 μm on the surface of the parts where the coating layer is mixed with the powder mixed with the coating layer; the rest are the same as in Example 1.

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Abstract

The invention discloses a preparation method of a wear-resistant coating for a liner of a ball mill, belonging to the field of engineering machinery remanufacturing. It includes a substrate and a coating layer, and the mass percentage of the substrate composition is C0.30~0.44wt%, Si1.50~2.0wt%, Mn0.8~1.40wt%, Cr2.0~2.8wt%, Mo≦0.3wt %, Ni≦0.3wt%, Re0.02wt%, P and S total 0.04wt%, and the rest is Fe; the coating layer contains WC-Co powder with a volume fraction of 95-98% and 2-5% Cr , the Cr / Co weight ratio is 0.2-0.5. The invention can endow the parts with special properties such as wear resistance and corrosion resistance, improve the reliability of the parts and prolong the service life of the parts, especially the wear resistance of the working surface of the wear-resistant liner of the ball mill.

Description

technical field [0001] The invention belongs to the technical field of engineering machinery remanufacturing, and more specifically relates to a method for preparing a wear-resistant coating for a liner of a ball mill. Background technique [0002] Materials are one of the material basis for human survival and development. Today's society has regarded reducing material loss as a very important issue. The failure of mechanical parts mostly starts from the surface, and the surface strength of materials directly affects the service life of mechanical parts. According to incomplete statistics, the economic losses caused by friction and wear of various mechanical parts all over the world are as high as hundreds of billions of dollars every year. Since friction and wear occur on the surface of materials, it is a simple and effective method to optimize the design and preparation of the required wear-resistant coating on the surface of ordinary materials by using advanced surface ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129C23C4/06C23C4/18
Inventor 朱协彬陈静顾小莉王刚蒋浩
Owner ANHUI POLYTECHNIC UNIV
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