Metal carbide coating technology for molds or mechanical parts

Diffusion method for metal molds or mechanical parts Metal carbide coating technology introduction:

1. Technology Introduction Diffusion method Metal carbide coating technology is to place the workpiece in a special medium, which forms a layer of metal carbide layers of several micrometers to tens of micrometers on the surface of the workpiece through diffusion. The carbide layer has a very high hardness, HV up to 1600 ~ 3000 (determined by the type of carbide), in addition, the carbide substrate and the metallurgical bonding, does not affect the surface finish of the workpiece, has a very high wear resistance, resistance Occlusion (cohesion), corrosion resistance and other properties, can greatly improve the service life of tooling and mechanical parts.

2. Comparison with related technologies The method of forming a film layer of a super-hard compound on the surface of a workpiece significantly improves its wear resistance, seizure resistance (anti-adhesion), corrosion resistance, and the like, thereby effectively improving its useful life. And the economic method. At present, the methods for super-hardening the workpiece surface mainly include physical vapor deposition (PVD), chemical vapor deposition (CVD), physical chemical vapor deposition (PCVD), and diffusion metal carbide substrate technology, wherein the PVD method has a low deposition temperature. The small deformation of the workpiece, but due to the poor adhesion of the film layer and the substrate, the process of coating around the poor, it is often difficult to play the performance advantages of super-hard film. The CVD method has outstanding advantages such as good film-bonding force and good process-plating properties, but for a large number of steel materials, the subsequent matrix hardening treatment is troublesome, and the film layer is easily damaged. Therefore, its application is mainly focused on hard alloys and other materials. The PCVD deposition temperature is low, and the film base bond strength and process reflowability are significantly improved compared to the PVD method. However, compared with the diffusion method, there is still a large gap between the film-based bonding force and the plasma film formation due to the PCVD method. Although coiling is improved compared to PVD, it cannot be eliminated. The metal carbide coating formed by the diffusion metal carbide coating technology forms a metallurgical bond with the substrate, and has a comparable film-based bonding force with PVD and PCVD. Therefore, this technology can really exert the performance advantages of the superhard film layer. This technology does not have the problem of coating around, the subsequent substrate hardening treatment is convenient, and can be repeated for many times, so that the application of this technology is more extensive.

3. Technology Advantages The diffusion metal carbide coating technology is widely used in Japan, European countries, Australia, and South Korea. According to investigations, a large number of matching dies used on imported equipment have used this technology in large quantities. When these molds are made in China, due to the lack of corresponding mature technologies, the life of the dies is often low, and some of them cannot even be made locally. This technology has been studied in the 1970s, but due to the limitations of various conditions, it is often difficult for the process and equipment to pass the test of batch and long-term production, so that some of the actual problems in the technology are not easily exposed or difficult to solve, and are often abandoned halfway. . During more than ten years of research and application, we have conducted in-depth research on the actual problems in the technology and equipment of the technology, and made effective improvements. The improved technology and complete sets of equipment have been able to meet the long-term needs. The requirements for stable production, the level of mold life handled by the mold have reached the level of the life of imported similar molds, and a wealth of practical experience in the production of various types of molds has been obtained, laying a solid technical foundation for the large-scale application of this technology.

4, the scope of application of diffusion metal carbide coating technology can be widely used in various types of wear and bite caused by failure of the mold or mechanical parts. Among them, the failure due to wear (such as punching, cold heading, powder molding, etc.) can increase the life time from several times to several ten times; due to the seizure caused by the product or die pull problems (such as the extension die, flanging Models, etc.) can be fundamentally resolved. Applicable materials: die steel, structural steel with carbon content greater than 0.3%, cast iron, hard alloy.