Preparation method of wear-resistant coating for high-accuracy roller piece

Abstract

The invention relates to a preparation method of a wear-resistant coating for a high-accuracy roller piece. In the invention, a nickel-based (or cobalt-based) prefabricated layer is prepared by using a supersonic flame spraying process, and the prefabricated layer is treated by adopting an induction heating method, so that the bonding intensity between the coating and a substrate is enhanced. Thewear-resistant coating is prepared by adopting a composite surface treatment technology, so that a workpiece is prevented from being deformed in the machining process, the prepared coating is dense and crackless and has uniform hardness and high binding intensity, and the surface wear resistance and impact resistance of the workpiece are enhanced; and moreover, a preparation technology has the advantages of simple process, high cladding efficiency, low machining cost and the like. After machining, the binding intensity between the coating and the substrate is more than or equal to 70 MPa, andthe hardness of the coating can be up to HRB 55-70 by adjusting the adding amount of solid-phase wolfram carbide (WC) in spraying powder. The preparation method can be widely applied to the preparation of surface reinforced layers for industrial components with severe working conditions, such as high-frequency friction pairs, papermaking rollers, pumping rods, loops and the like.

Description

technical field

[0001] The invention relates to a method for preparing a wear-resistant coating of a high-precision roller, and belongs to the technical field of wear-resistant coating preparation. Background technique

[0002] In industrial production, a high-hardness reinforcement layer is often prepared on the surface of the workpiece to improve its wear resistance. At present, thermal spraying and remelting technologies are usually used at home and abroad to prepare wear-resistant layers to achieve wear-resistant strengthening on the surface of workpieces, mainly including supersonic flame spraying (HVOF), atmospheric plasma spraying (APS), plasma surfacing, high-frequency induction melting, etc. Deposit, vacuum fusion, spray welding, etc. The wear-resistant coating prepared by single thermal spraying technology such as HVOF spraying and APS spraying is usually mechanically bonded to the substrate, and its bonding strength is difficult to meet the needs of actual workin...