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

A boride, high-entropy technology, applied in the field of ceramic cutting tools, can solve the problems that the application of boride-based ceramic materials has not been reported, and achieve shortened grain growth time, good high temperature strength and hardness, good wear resistance and The effect of cutting performance

Inactive Publication Date: 2019-12-31
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation of boride-based ceramic materials by this technology and i

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation:

[0029] (1) with (Ti 0.2 Zr 0.2 f 0.2 Ta 0.2 Cr 0.2 )B 2 Powder is (particle size4 C powder (purity is 99.5%, particle size is 1μm), SiC (purity is 99.5%, particle size is 300nm), according to (Ti 0.2 Zr 0.2 f 0.2 Ta 0.2 Cr 0.2 )B 2 :B 4 C: The volume ratio of SiC is 70:15:15 for batching, ethanol is used as solvent, and cemented carbide YG6 balls are used as ball milling medium. After mixing for 6 hours at a speed of 300r / min in a planetary ball mill, a uniformly mixed (Ti 0.2 Zr 0.2 f 0.2 Ta 0.2 Cr 0.2 )B 2 -B 4 C-SiC powder.

[0030] (2) will (Ti 0.2 Zr 0.2 f 0.2 Ta0.2 Cr 0.2 )B 2 -B 4 Put the C-SiC mixed powder into the graphite mold of the spark plasma sintering furnace, raise the temperature to 1000°C at a rate of 300°C / min under a vacuum of less than 1mbar, and then fill it with 1atm argon gas within 1min, after the inflation is completed , pressurize axially to 40MPa within 2 minutes, and raise the temperature to 1900°C ...

Embodiment 2

[0037] 1. Preparation:

[0038] (1) with (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 Powder is (particle size4 C powder (purity is 99.5%, particle size is 1μm), SiC (purity is 99.5%, particle size is 300nm), according to (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 :B 4 C: The volume ratio of SiC is 70:25:5 for batching, ethanol is used as solvent, and cemented carbide YG6 balls are used as ball milling medium. After mixing for 6 hours at a speed of 300r / min in a planetary ball mill, a uniformly mixed (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 -B 4 C-SiC powder.

[0039] (2) will (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 -B 4 Put the C-SiC mixed powder into the graphite mold of the spark plasma sintering furnace, raise the temperature to 1000°C at a rate of 300°C / min under a vacuum of less than 1mbar, and then fill it with 1atm argon gas within 1min, after the inflation is completed , pressurize axially to 40MPa within 2 minutes, and raise the temperature to 19...

Embodiment 3

[0042] 1. Preparation:

[0043] (1) with (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 Powder is (particle size4 C powder (purity is 99.5%, particle size is 1μm), SiC (purity is 99.5%, particle size is 300nm), according to (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 :B 4 C: The volume ratio of SiC is 70:5:25 for batching, ethanol is used as solvent, and cemented carbide YG6 balls are used as ball milling medium. After mixing for 6 hours at a speed of 300r / min in a planetary ball mill, a uniformly mixed (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 -B 4 C-SiC powder.

[0044] (2) will (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 -B 4 Put the C-SiC mixed powder into the graphite mold of the spark plasma sintering furnace, raise the temperature to 1000°C at a rate of 300°C / min under a vacuum of less than 1mbar, and then fill it with 1atm argon gas within 1min, after the inflation is completed , pressurize axially to 40MPa within 2 minutes, and raise the temperature to 20...

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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...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622C04B35/64
CPCC04B35/58064C04B35/58071C04B35/58078C04B35/622C04B35/64C04B2235/3821C04B2235/3826C04B2235/5445C04B2235/5436C04B2235/666C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/6581C04B2235/658C04B2235/96
Inventor 郭伟明许亮谭大旺林华泰
Owner GUANGDONG UNIV OF TECH
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