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Aluminum oxide reinforced high-entropy boride ceramic as well as preparation method and application thereof

A technology of borides and alumina, which is applied in the field of alumina-enhanced high-entropy boride ceramics and its preparation, can solve problems that have not been reported in the application, and achieve grain growth inhibition, good high-temperature strength and hardness, and good wear resistance The effect of sex and machinability

Inactive Publication Date: 2019-12-24
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of alumina reinforced high-entropy boride ceramic materials by this technology and its application in the field of cutting tools have not been reported.

Method used

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  • Aluminum oxide reinforced high-entropy boride ceramic as well as preparation method and application thereof
  • Aluminum oxide reinforced high-entropy boride ceramic as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation:

[0030] (1) With (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 Powder is (particle size 2 O 3 Powder (purity is 99.5%, particle size is 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 : Al 2 O 3 The volume ratio is 80:20 for batching, ethanol is used as solvent, cemented carbide Al 2 O 3 The ball is the ball milling medium. After the planetary ball mill is mixed at 300r / min for 24h, a uniformly mixed (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 -Al 2 O 3 Powder.

[0031] (2) Put (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 -Al 2 O 3 The mixed powder is put into the graphite mold of the spark plasma sintering furnace, heated to 900°C at a rate of 300°C / min under the vacuum condition of less than 1mbar, and then filled with 1atm argon within 1min. After the filling is completed, within 2min The inner axis is pressurized to 40MPa, and at the same time as the inflation starts, the temperature is increased to 1800°C at a rate of 100°C / min, and the temperature is kept for 15 minutes. Afte...

Embodiment 2

[0038] 1. Preparation:

[0039] (1) With (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 Powder is (particle size 2 O 3 Powder (purity 99.5%, particle size 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 : Al 2 O 3 The volume ratio is 75:25 for batching, ethanol is used as solvent, and cemented carbide Al 2 O 3 The ball is the ball milling medium. After the planetary ball mill is mixed at 300r / min for 24h, a uniformly mixed (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 -Al 2 O 3 Powder.

[0040] (2) Put (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 -Al 2 O 3 The mixed powder is put into the graphite mold of the spark plasma sintering furnace, heated to 900°C at a rate of 300°C / min under the vacuum condition of less than 1mbar, and then filled with 1atm argon within 1min. After the filling is completed, within 2min The inner axial pressure is increased to 30MPa, and at the same time the inflation starts, the temperature is increased to 1900°C at a rate of 100°C / min, and the temperature is kept for 10 minutes. A...

Embodiment 3

[0043] 1. Preparation:

[0044] (1) With (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 Powder is (particle size 2 O 3 Powder (purity 99.5%, particle size 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 : Al 2 O 3 The volume ratio is 85:15 for batching, ethanol is used as solvent, and cemented carbide Al 2 O 3 The ball is the ball milling medium. After the planetary ball mill is mixed at 300r / min for 24h, a uniformly mixed (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 -Al 2 O 3 Powder.

[0045] (2) Put (Ti 0.2 Zr 0.2 Hf 0.2 Ta 0.2 Cr 0.2 )B 2 -Al 2 O 3 The mixed powder is put into the graphite mold of the spark plasma sintering furnace, heated to 900°C at a rate of 300°C / min under the vacuum condition of less than 1mbar, and then filled with 1atm argon within 1min. After the filling is completed, within 2min The inner axial pressure is increased to 35MPa, and at the same time the inflation is started, the temperature is increased to 1900°C at a rate of 100°C / min, and the temperature is kept for 15 minute...

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Abstract

The invention belongs to the field of ceramic cutting tools, and discloses aluminum oxide reinforced high-entropy boride ceramic as well as a preparation method and application thereof. The alumina-reinforced high-entropy boride ceramic is prepared by the following steps: carrying out ball milling and mixing on high-entropy boride ceramic powder (A<0.2>B<0.2>C<0.2>D<0.2>E<0.2>) B2 and a reinforcing phase Al2O3; drying the mixture to obtain mixed powder; heating the mixture powder to 900-1200 DEG C in vacuum; then under argon protection and axial pressurization of 30-50 MPa, heating the mixed powder to 1700-1900 DEG C; and performing spark plasma sintering, wherein the A, B, C, D, and E are different elements selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo or W. The alumina-reinforced high-entropy boride ceramic has the advantages of high hardness, favorable chemical stability, favorable wear resistance and favorable cutting property, and can be applied to the field of cutting tools for difficult-to-machine materials.

Description

Technical field [0001] The invention belongs to the technical field of ceramic cutting tools, and more specifically relates to an alumina reinforced high-entropy boride ceramic and a preparation method and application thereof. Background technique [0002] High-entropy ceramics is a high-entropy solid solution of inorganic non-metallic materials. It is generally a single-phase ceramic material composed of more than 4 metal elements in equal proportions and several non-metal elements. Boride ceramic is a kind of ceramic material with high melting point and high hardness, which has excellent high temperature and wear resistance. Among them, the high-entropy boride is a high-entropy solid solution formed by the combination of a variety of equal atomic ratio transition group metal elements and B atoms, and is a single-phase multi-boride crystal. [0003] Among them, the chemical formula of 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/10C04B35/622
CPCC04B35/10C04B35/58064C04B35/622C04B2235/3217C04B2235/3813C04B2235/5436C04B2235/5445C04B2235/656C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/658C04B2235/666C04B2235/77C04B2235/96
Inventor 许亮谭大旺郭伟明林华泰
Owner GUANGDONG UNIV OF TECH
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