(Ti, La) (C, N)-based metal ceramic composite material and preparation method thereof

Abstract

The invention belongs to the technical field of powder metallurgy, and discloses a (Ti, La) (C, N)-based metal ceramic composite material and a preparation method thereof. The (Ti, La) (C, N)-based metal ceramic composite material is prepared from a hard phase and a binding phase, wherein the hard phase is prepared from (Ti, La) (C, N), TaC, TiC, NbC, WC, Mo2C and Cr3C2; the binding phase is prepared from Co and Ni; and the (Ti, La) (C, N) is solid solution powder obtained through carbonitriding TiO2, the TiC, C and La2O3 / LaB6 at high temperature in a graphite carbon tube furnace. According tothe (Ti, La) (C, N)-based metal ceramic composite material and the preparation method thereof provided by the invention, a pre-solid-solution treatment technology is adopted, and a rare earth elementLa in a pre-solid-solution form is directly added into the hard-phase (Ti, La) (C, N), so that the research progress of a multielement carbon-nitrided solid solution is greatly promoted, the hardness, the wear resistance, the strength and the toughness of the (Ti, La) (C, N)-based metal ceramic composite material are effectively improved, and the novel composite material has an excellent combination property.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and more specifically relates to a (Ti, La) (C, N)-based cermet composite material and a preparation method thereof. Background technique [0002] Cermet is a heterogeneous composite material composed of metal or alloy and one or more ceramic phases. There are many types of cermets, among which Ti(C,N)-based cermets are favored at home and abroad due to their characteristics of high hardness, low density, chemical stability, good polishability, good oxidation resistance and excellent creep resistance. , and has shown its great potential as a traditional WC-Co cemented carbide replacement material. In addition, due to the small specific gravity of Ti(C,N)-based cermets, excellent high-temperature mechanical properties and acid and alkali corrosion resistance, it can also be used in aerospace jet engines, turbine engines and other fields, as well as in petroleum, mining and other industr...

AI Technical Summary

Problems solved by technology

However, due to the high activity of most rare earth elements, they are extremely easy to be oxidized, and the addition amount of rare earth elements is a small amount, which will inevitably make it difficult to control the uniform distribution of rare earth elements in Ti(C,N)-based cermets, resulting in rare earth Ti(C,N) ,N)-based cermet materials have poor performance stability, which greatly affects the further development of this technology

[0004] Chinese patent CN102534335A discloses "Ti(C,N)-based cermets modified by rare earth alloy powder and its preparation method". N)-based cermets are modified so that the rare earth elements are dissolved in the binder phase first, and then added to the cermets in the form of rare earth alloys. Although the problem of uneven distribution of rare earth elements caused by the small amount of rare earth additions is solved, However, this method leads to an increase in the addition of both the binder phase and the rare earth elements, and the rare earth elements need to be solid-dissolved in the binder phase first, and the process is complicated.

[0005] At present, there is no report on the preparation of (Ti,La)(C,N)-based cermet composites by using the solid solution improvement method of rare earth element La alone.

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