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
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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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