Preparation method of hard particle reinforced impact-resistant and wear-resistant coating for machine-made sand

Abstract

The invention discloses a preparation method of a hard particle reinforced impact-resistant and wear-resistant coating for machine-made sand, which comprises the following steps: firstly, preparing nano Al2O3 powder and pure Ni coated TiC powder, mixing NiCrBSi self-fluxing alloy powder, the nano Al2O3 powder and the pure Ni coated TiC powder through a plurality of additives to form mixed slurry, and then carrying out spray-drying granulation on the mixed slurry to obtain spherical granulated powder with the particle size of 30-120 [mu] m; and finally, coating the surface of a high manganese steel substrate with the granulated powder through a plasma spraying and laser remelting synchronous technology to form a wear-resistant coating through deposition, wherein pure Ni coated TiC is added into the NiCrBSi coating so as to enhance the erosive wear resistance of the coating. The nano Al2O3 is uniformly distributed on the whole of the coating by the method, so that the coating has higher hardness and better toughness at the same time; and the coating is prepared by the plasma spraying and laser remelting synchronous technology, so that the bonding strength between the coating and the substrate is relatively high.

Description

technical field [0001] The invention relates to a preparation method of a hard particle-reinforced impact-resistant and wear-resistant coating for machine-made sand, which belongs to the technical field of surface engineering. Background technique [0002] In recent years, the relevant equipment of the machine-made sand industry has been continuously improved. The sand making method has changed from wet sand making to dry sand making. The sand making machine has changed from the traditional hammer sand making machine to the impact sand making machine. Earth-shaking changes. However, in the face of materials with high hardness and abrasiveness index such as pebbles and granite, key parts such as hammerheads and liners are impacted, squeezed, sheared, ground, and fatigued by broken abrasives, which are prone to serious wear and tear. Failure, replacement is extremely frequent, resulting in a substantial increase in production costs. [0003] In order to improve the anti-eros...

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Problems solved by technology

It uses copper-coated nickel-based alloy powder, and uses the cold spraying process to deposit the spray on the surface of the substrate to form a coating with a thickness of 0.05mm to 2mm. Although the surface hardness of the coating can reach 1200Hv to 1500Hv, it can be sanded at a small angle of attack. However, due to the high brittleness of the coating, the main reason for the poor protection effect is the lack of toughness of the coating and the peeling off of the sand and gravel erosion process at large angles of attack.

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