High-entropy boride-based ceramic, preparation method and applications thereof

Abstract

The invention belongs to the field of ceramic cutting tools, and discloses a high-entropy boride-based ceramic, a preparation method and applications thereof. The preparation method comprises: carrying out ball milling mixing on high-entropy boride ceramic powder (A0.2B0.2C0.2D0.2E0.2)B2, an additive B4C and SiC, and drying to obtain mixed powder, wherein A, B, C, D and E respectively are different elements selected from Ti, Zr, Hf, V, Nb, Ta, C, Mo and W; heating the mixed powder to 1000-1500 DEG C in vacuum through a spark plasma method; and axially pressurizing to 25-50 MPa in an argon atmosphere, heating to 1800-2000 DEG C, and sintering to obtain the high-entropy boride-based ceramic. The high-entropy boride-based ceramic of the invention is high in hardness and good in chemical stability, has good wear resistance and good cutting performance, and can be used in the field of cutting tools for difficult-to-process materials.

Description

technical field

[0001] The invention belongs to the technical field of ceramic cutting tools, and more specifically relates to a high-entropy boride-based ceramic and its preparation method and application. Background technique

[0002] High-entropy ceramics are high-entropy solid solutions of inorganic non-metallic materials, and are generally single-phase ceramic materials composed of more than 4 equal-proportion metal elements and several non-metal elements. Boride ceramics are ceramic materials with high melting point and high hardness, which have excellent high temperature resistance and wear resistance. Among them, the high-entropy boride is a high-entropy solid solution formed by combining a variety of transition metal elements with equal atomic ratios and B atoms, and is a single-phase multi-component boride crystal. Among them, the chemical formula of the 5-membered high-entropy boride is (A 0.2 B 0.2 C 0.2 D. 0.2 E. 0.2 )B 2 , ABCDE is a metal element of Gro...

Images