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Method for preparing wear-resistant coating of ball mill lining plate

A ball mill liner and wear-resistant coating technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problem of long redesign, achieve low equipment investment, low porosity, excellent corrosion resistance performance effect

Active Publication Date: 2015-11-18
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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  • Method for preparing wear-resistant coating of ball mill lining plate
  • Method for preparing wear-resistant coating of ball mill lining plate
  • Method for preparing wear-resistant coating of ball mill lining plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] A method for preparing a wear-resistant coating for a liner of a ball mill, the steps of which are as follows:

[0066] 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;

[0067] 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 difference between the coating and the substrate surface and prevent the coating from cracking. Cracking and peeling, while also removing moisture on the surface of the workpiece, accelerating the deformation of molten fine particles, and increasing the deposition rate;

[0068] c. Spray primer layer: use supersonic flame spraying technology to spray the mixed coating layer powder on the surface of the substrate with a thickness of 80um after drying a...

Embodiment 2

[0076] 1. A ball mill liner wear-resistant coating, the coating layer containing volume fraction of 98% WC-Co powder and 2% Cr, the weight ratio of Cr / Co is 0.2; the WC-Co The powder is uniformly and discretely distributed in the coating.

[0077] 2. In step d, use the supersonic flame spraying technology to spray the ceramic working coating with a thickness of 250um on the part surface of the sprayed primer layer with the powder mixed with the coating layer; the rest are the same as in embodiment 1.

[0078] 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 decrease of Cr element causes the self-corrosion potential of WC-10Co-2Cr in 3.5wt% NaCl solution to decrease to -0.474V. Corrosion current density increased ...

Embodiment 3

[0081] 1. a preparation method of a ball mill liner wear-resistant coating, the coating layer contains 96% WC-Co powder and 4% Cr by volume fraction, and the weight ratio of Cr / Co is 0.4; The WC-Co powder is uniformly and discretely distributed in the coating.

[0082] 2. In step d, use the supersonic flame spraying technology to spray the ceramic working coating with a thickness of 275um on the part surface of the sprayed primer layer with the powder mixed with the coating layer; the rest are the same as in embodiment 1.

[0083] Example 4

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Abstract

The invention discloses a method for preparing a wear-resistant coating of a ball mill lining plate, and belongs to the field of remanufacturing of engineering machines. The wear-resistant coating comprises a base and a coating layer. The base comprises, by weight, 0.30%-0.44% of C, 1.50%-2.0% of Si, 0.8%-1.40% of Mn, 2.0%-2.8% of Cr, equal to or less than 0.3% of Mo, equal to or less than 0.3% of Ni, 0.02% of Re, 0.04% of P and S, and the balance Fe. The coating layer comprises, by volume fraction, 95%-98% of WC-Co powder and 2%-5% of Cr. The weight ratio of Cr to Co is 0.2-0.5. The method enables a part to have wear resistance, corrosion resistance and other special performance, the reliability of the part is improved, the service life of the part is prolonged, and especially the wear resistance of the working surface of the ball mill lining plate is improved.

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 Applications(China)
IPC IPC(8): C23C4/12C23C4/06C23C4/18
Inventor 朱协彬陈静顾小莉王刚蒋浩
Owner ANHUI POLYTECHNIC UNIV
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