Powder metallurgy technology for cermet materials

The cermet material powder metallurgy technology mainly includes ultra-fine cemented carbide of cermet material powder metallurgy technology, special hard phase hard alloy, gradient functional hard alloy, hard alloy heat treatment, coated cemented carbide, new technology and new Process and new equipment, as well as Ti (C, N) based cermets.

1 cermet material powder metallurgy technology of ultra-fine cemented carbide

In order to make the whole cemented carbide material have good toughness and wear resistance at the same time, research on ultra-fine to nano-grain cemented carbide materials is currently carried out. The main method of refining grains is to add inhibitors that limit grain growth, especially to control the madness of a small portion of WC grains, which is one of the sources of cracks.

2 Special hard phase cemented carbide for cermet material powder metallurgy technology

Special hard phase cemented carbides of cermet material powder metallurgy technology mainly include disc-shaped hard phase-hardened cemented carbide and bimodal cemented carbide. The disk-shaped hard phase-reinforced cemented carbide refers to a preferred growth of the bottom surface (0001) of a WC grain which is a triangular prism or a polygonal prism in a conventional cemented carbide, thereby being converted into a triangular plate shape.

3 cermet material powder metallurgy technology gradient functional carbide

In order to improve the cutting performance of the tool, the functional design concept of the gradient functional material is introduced into the field of cemented carbide tool materials to achieve good wear resistance on the surface of the material, good fracture toughness inside, and compressive residual stress in the gradient composition layer. . Although coated cemented carbide is used as a material with both characteristics, there is a problem of high cost due to the special process of ceramic coating. To study the surface, this new material has higher wear resistance, fracture toughness and thermal crack resistance than a uniform metal coating of uniform composition.

4 Carbide heat treatment of cermet material powder metallurgy technology

Carbide heat treatment can improve the overall performance of the alloy by changing the structure and properties of the entire volume of the cemented carbide product. Studies have shown that the heat treatment significantly improves the mechanical properties, wear resistance and fatigue strength, so that the service life of the cemented carbide is greatly improved.

5 cermet material powder metallurgy technology coated carbide

Surface coating of cemented carbide products with cermet material powder metallurgy technology - Coating technology is an advanced technology developed in recent years and is an important technological breakthrough in the field of cemented carbide. The appearance of surface coating technology of cemented carbide products provides a more effective way to solve the contradiction between the wear resistance and toughness of cemented carbide. At present, the research and development work to improve the coating effect is basically carried out in two directions: one is to improve the equipment and process for making wear-resistant coatings; the other is to develop new components of coatings and explore the wear-resistant coatings. new material.

6 New technologies, new processes and new equipment for powder metallurgy technology of cermet materials

In order to meet the needs of cemented carbides to improve products, quality and increase product variety, new technologies and new processes and new equipment have been developed while further improving and perfecting the production process and equipment of cemented carbide. Such as high temperature self-propagating synthesis technology, plasma milling technology, fluidized bed granulation technology, injection molding technology and other new forming technology, plasma sintering technology, microwave sintering technology, various new chemical and physical vapor deposition technologies and various strengthening Processing technology, etc.

7 Titanium (C, N)-based cermets of cermet material powder metallurgy

The cermet material powder metallurgy Ti(C,N)-based cermet is developed on the basis of TiC-based cermet, which makes Ti(C,N)-based cermet excellent in high temperature and wear resistance, good toughness and New cermet of strength. Kieffer of the Technical University of Vienna in Austria found that the introduction of TiN in TiC-based cermets occurred after the significant effect of TiN in TiC-Ni materials.

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