Diffusion method of metal carbide coating technology for stainless steel welded pipe die

Diffusion metal carbide coating technology is to place the workpiece in a special medium, and form a metal carbide layer of several micrometers to tens of micrometers on the surface of the workpiece through diffusion. The carbide layer has extremely high hardness, HV can reach 1600~3000 (determined by the type of carbide). In addition, the carbide layer is metallurgically combined with the substrate, which does not affect the surface finish of the workpiece, and has extremely high wear resistance and resistance. Occlusion (bonding), corrosion resistance and other properties can greatly increase the service life of tooling and mechanical parts.

Compared with related technologies, the method of forming a superhard compound film on the surface of the workpiece can greatly improve its wear resistance, seizure resistance (anti-adhesion), corrosion resistance and other properties, thereby greatly improving its service life Effective and economical method. At present, the surface super-hardening treatment methods of workpieces mainly include physical vapor deposition (PVD), chemical vapor deposition (CVD), physical chemical vapor deposition (PCVD), and diffusion metal carbide layer technology. Among them, the PVD method has a low deposition temperature. The advantages of small deformation of the workpiece, but due to the poor bonding force between the film layer and the substrate, the process winding and plating performance is not good, and it is often difficult to give play to the performance advantages of the superhard compound film layer. The CVD method has outstanding advantages such as good film-base bonding and good process winding and plating properties. However, for a large number of steel materials, the subsequent hardening of the matrix is u200bu200bmore troublesome. If you are not careful, the film layer is easy to be damaged. Therefore, its application is mainly concentrated on materials such as cemented carbide. The PCVD method has a low deposition temperature, and the film base bonding force and process winding property are greatly improved compared with the PVD method. However, compared with the diffusion method, the film base bonding force still has a large gap. In addition, the PCVD method is still plasma film formation Although the winding property is improved compared with PVD method, it cannot be eliminated.

The metal carbide coating formed by the diffusion method metal carbide coating technology forms a metallurgical bond with the substrate, and has a film-base bonding force unmatched by PVD and PCVD, so this technology can truly exert the performance of the super hard film layer Advantages, in addition, the technology does not have the problem of winding and plating, the subsequent substrate hardening treatment is convenient, and the treatment can be repeated many times, which makes the applicability of the technology more extensive.

The diffusion method metal carbide coating technology is widely used in Japan, European countries, Australia, South Korea and other countries. According to investigations, many matching molds on imported equipment use this technology in large quantities. When these molds are made domestically, due to the lack of corresponding mature technology, the mold life is often low, and some of them cannot even be made domestically.