Enhanced phase system for preparing metal ceramic, and preparation method of enhanced phase system

Abstract

The invention discloses an enhanced phase system for preparing metal ceramic, and a preparation method of the enhanced phase system. The enhanced phase system for preparing the metal ceramic is prepared from mixed powder obtained by mixing and ball-milling 4-8 parts by weight of a first component, 0.5-3 parts by weight of a second component and 2-5 parts by weight of a third component, wherein thefirst component is any of several of nitrogen-aluminum compound powder, nitrogen-silicon compound powder, nitrogen-thallium compound powder, nitrogen-thorium compound powder, silicon-nickel compoundpowder, nickel-thallium compound powder, aluminum-thallium compound powder, and niobium-aluminum compound powder; the second component is any of several of rare earth boride powder, rare earth oxide powder, rare earth carbide powder, boron-chromium compound powder, boron-titanium compound powder, and boron-indium compound powder; the third component is abrasive powder. The preparation method of the enhanced phase system comprises the following steps: (1) mixing the first component, the second component and the third component, and carrying out wet grinding for 5-10h; (2) freeze-drying to obtain the enhanced phase system.

Description

technical field [0001] The invention relates to the technical field of cermets, in particular to a strengthening phase system for preparing cermets and a preparation method thereof. Background technique [0002] Titanium carbonitride (Ti(Cx,Ny))-based cermet is a kind of titanium carbonitride or titanium carbide and titanium nitride mixed powder as the main raw material of the hard phase, and iron group metals as the binder phase raw material. And it is a composite material formed by crushing, mixing, molding and sintering. Titanium carbonitride-based cermets have good performance, showing high red hardness, strength, low corrosion, thermal conductivity and friction coefficient in cutting, and also have a long life and the processed workpiece The surface is characterized by a high surface finish. With the development of cermet materials, more and more types of workpieces are processed, the processing conditions are getting worse, and the processing quality requirements are...

AI Technical Summary

Problems solved by technology

The traditional addition method has the following disadvantages: 1) The transition metal carbide powder is mixed with the titanium carbonitride powder simply by mechanical mixing, although a solid solution or a transition layer compound can be formed on the hard phase titanium carbonitride during sintering However, the annular shell is usually incomplete, so that a part of the titanium carbonitride in the hard phase is in direct contact with the metal of the bonding phase, causing problems such as decarburization of the hard phase, and making the fracture toughness of the cermet 2) Due to the poor compatibility of various transition metal carbides, even if a variety of transition metal carbides are added at the initial stage of the reaction, the various transition metals in the annular shell formed by sintering The carbide is not effectively dissolved in one body, so that the titanium carbonitride cannot be effectively combined with the binder phase, and the comprehensive improvement effect is not obvious. Therefore, a single transition metal carbide is usually used to treat the titanium carbonitride. improved metal-ceramic

Although the above two methods have improved the performance of cermets to a certain extent, the improvement effect is not obvious, and it is difficult to obtain raw materials with certain morphology and smaller particle size.

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