Application status of powder metallurgy in ceramic materials

Ceramic materials are mainly divided into ordinary ceramics and special ceramics according to different properties. Ordinary ceramics are ceramic materials made of clay and other materials sintered by traditional methods, which are generally brittle and fragile. Special ceramics are ceramic materials made of artificial compounds, such as oxides, nitrides, carbides and borides.

Special ceramics, also known as metal ceramics, is a kind of ceramic material that can be produced by metal powder metallurgy method like metal. Special ceramics have the characteristics of high strength, high hardness, corrosion resistance and high temperature resistance. Some special ceramics have good toughness after toughening treatment, which has been widely used in both traditional industrial fields and emerging high-tech fields.

However, the high hardness and high strength of special ceramic materials have brought a lot of difficulties for their processing and forming, and metal powder metallurgy is a feasible forming method with advantages. Ceramic materials can be made into metal ceramic materials by adding a certain amount of metal elements, among which a very important class of metal ceramic materials is cemented carbide, the coating on the surface of cemented carbide products is an advanced technology developed in recent years.

This technology can improve the wear resistance and toughness of cemented carbide products, but limited to the equipment and process and the conditions of the coating composition, the technology still has many problems, I believe that in the future with the improvement of related equipment and process methods and the development of new coating materials, the technology will play a greater role.

In order to meet the increasing requirements of the market, cemented carbide products enterprises should continuously improve product quality and develop new products to enrich product types. Under this demand, new metal powder metallurgy technologies have been continuously developed, such as high temperature self-propagating synthesis technology, plasma pulverizing technology, fluidized bed granulation technology, plasma sintering technology and various new physical and chemical strengthening technologies.

Ti(C,N)-based cermets based on metal powder metallurgy technology have excellent high temperature resistance and wear resistance, as well as good toughness and strength. Ultrafine cemented carbide based on this technology is mainly refined by adding inhibitors to inhibit grain growth to obtain densified materials.

In addition, the results of metal powder metallurgy technology of cermet materials are also manifested in the gradient function cemented carbide, cemented carbide with special hard phase, cemented carbide heat treatment, etc. It is precisely because of the technical and economic advantages of powder metallurgy, the overall performance of cermet materials has been rapidly improved in a short time. With the gradual maturity of the new near-net-shape technology represented by powder injection molding, metal powder metallurgy will continue to play a role in the fields of material science and metallurgical science and parts manufacturing.

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