Hard coat preparation method convenient for recoating of hard alloy workpiece

Abstract

A hard coat preparation method convenient for recoating of a hard alloy workpiece comprises the following steps: 1, preprocessing the hard alloy workpiece with a traditional process (refacing and decoating are carried out before the processing if the workpiece is a coated workpiece); 2, filling the hard alloy workpiece into a vacuum chamber, and pumping the vacuum chamber to a background vacuum; 3, heating the workpiece to a required temperature; 4, bombarding the workpiece through energetic ions to expose a fresh surface; 5, depositing at least one layer of a protection film on the surface of the workpiece, wherein the protection film cannot be dissolved by a hard coat decoating solution; and 6, depositing a hard coat on the surface of the workpiece through using a routine hard coat preparation method. The hard coat preparation method provided by the invention well combines the traditional solution decoating technology and the vacuum ion etching technology, has the advantages of simple operation and low cost, and well solves adverse influences of the decoating solution to a base material in the recoating of the hard alloy workpeice.

Description

technical field [0001] The invention relates to a method for preparing a hard coating which is convenient for recoating of a hard alloy workpiece, which can overcome the adverse effects of the commonly used hard coating deplating solution on the hard alloy base material during the deplating process. Background technique [0002] The commonly used material of cemented carbide is WC-Co, which is currently the most widely used cutting tool material. With the continuous improvement of tool performance requirements, hard coating technology is widely used in the field of cutting tools. The service life and cutting efficiency of cutting tools can be greatly improved by coating TiN, TiAlN, AlTiN, TiCN and other hard coatings on the surface of cemented carbide tools by physical vapor deposition. In order to reduce the cost of using the tool more effectively, recoating can be carried out before the coated tool fails. The traditional recoating process includes the following steps: 1....

AI Technical Summary

Problems solved by technology

Because this type of chemical reagent will cause a large amount of Co on the surface of the cemented carbide to dissolve when it comes into contact with the cemented carbide substrate, resulting in a Co-poor layer on the surface of the cemented carbide, which will greatly increase the surface roughness and decrease the surface strength of the tool. , seriously affect its use effect after recoating, so this type of formula is not suitable for deplating of cemented carbide substrates

There are also newly developed stripping agents that have no significant effect on cemented carbide substrates in the international market, such as the Swiss Deconex series products, but their prices are very expensive and are not suitable for mass promotion