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High-entropy ceramic with high toughness and high wear resistance and preparation method and application thereof

A high wear resistance and high toughness technology, applied in the field of ceramic processing, can solve the problem of high sintering temperature, and achieve the effect of improving material properties, increasing fracture paths, fracture toughness and excellent wear resistance.

Inactive Publication Date: 2019-11-29
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it is precisely because of its excellent performance that its sintering temperature is high
Although its high-entropy boride ceramics also have excellent properties such as high strength, hardness, excellent wear resistance, excellent high-temperature strength, good structural stability, and good corrosion and oxidation resistance, the reported The sintering temperature of high-entropy boride ceramics is higher than 2000 °C, and further exploration is needed to improve its sintering performance

Method used

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  • High-entropy ceramic with high toughness and high wear resistance and preparation method and application thereof
  • High-entropy ceramic with high toughness and high wear resistance and preparation method and application thereof
  • High-entropy ceramic with high toughness and high wear resistance and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0037] 1. With HfO 2 (powder purity 99.9%, particle size 1μm), ZrO 2 (powder purity 99.9%, particle size 1μm), Ta 2 o 5 (powder purity 99.9%, particle size 2μm), TiO 2 (powder purity 99.9%, particle size 1μm) and Nb 2 o 5 (The purity of the powder is 99.9%, particle size 1μm) The powder is dosed according to the equiatomic ratio, mixed with amorphous boron powder (purity 95.6%, particle size 1μm), amorphous boron powder and HfO 2 , ZrO 2 and TiO 2 The molar ratio is 3.67:1, amorphous boron powder and Ta 2 o 5 and Nb 2 o 5 The molar ratios are all 8.067:1. With ethanol as solvent, Si 3 N 4 The ball is the ball milling medium, and it is mixed on a roller ball mill for 24 hours, and the mixed powder is obtained after mixing and drying.

[0038] 2. Put the molded green body of the mixed powder into a graphite crucible, heat it up to 900°C at a rate of 10°C / min and keep it warm for 2 hours, wash it with water once, and then dry it by suction filtration. The whole sint...

Embodiment 2

[0042] 1. With HfO 2 (powder purity 99.9%, particle size 1μm), ZrO 2 (powder purity 99.9%, particle size 1μm), MoO 3 (powder purity 99.9%, particle size 2μm), TiO 2 (powder purity 99.9%, particle size 1μm) and Nb 2 o 5 (The purity of the powder is 99.9%, the particle size is 2 μm). 2 , ZrO 2 and TiO 2 The molar ratio is 3.67:1, amorphous boron powder and Nb 2 o 5 The molar ratio is 8.067:1, amorphous boron powder and MoO 3 The molar ratio is 4.4:1 with ethanol as solvent and Si 3 N 4 The ball is the ball milling medium, and it is mixed on a roller ball mill for 24 hours, and the mixed powder is obtained after mixing and drying.

[0043] 2. Put the molded green body of the mixed powder into a graphite crucible, heat it up to 1000°C at a rate of 15°C / min and keep it warm for 3 hours, wash it with water once, and then dry it by suction filtration. The whole sintering process is vacuum and the pressure is 0.1Pa , the obtained high entropy boride powder.

[0044] 3. Pu...

Embodiment 3

[0047] 1. With HfO 2 (powder purity 99.9%, particle size 2μm), Ta 2 o 5 (powder purity 99.9%, particle size 1μm), MoO 3 (powder purity 99.9%, particle size 2μm), TiO 2 (powder purity 99.9%, particle size 3μm) and Nb 2 o 5 (Powder purity 99.9%, particle size 4μm) powder is proportioned in equal atomic proportions, mixed with amorphous boron powder (purity 95.6%, particle size 1μm), amorphous boron powder and HfO 2 and TiO 2 The molar ratio is 3.8:1, amorphous boron powder and Ta 2 o 5 and Nb 2 o 5 The molar ratio is 8.8:1, amorphous boron powder and MoO 3 The molar ratio is 4.5:1 with ethanol as solvent and Si 3 N 4 The ball is the ball milling medium, and it is mixed on a roller ball mill for 24 hours, and the mixed powder is obtained after mixing and drying.

[0048] 2. Put the molded green body of the mixed powder into a graphite crucible, heat it up to 1100°C at a rate of 20°C / min and keep it warm for 3 hours, wash it with water for 4 times, and then dry it by ...

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Abstract

The invention belongs to the technical field of ceramic processing, and discloses high-entropy ceramic with high toughness and high wear resistance and a preparation method and application thereof. The molecular formula of the high-entropy ceramic is (Me1aMe2bMe3cMe4dMe5e)B2, and a, b, c, d and e are greater than or equal to 0.1 and less than or equal to 0.9; Me1 and Me5 are Hf, Zr or Ti; Me2 is Nb or Ta; Me3 is Cr, and Me4 is Mo; the high-entropy ceramic is prepared by the following steps: ball-milling and mixing Me1 oxide, Me2 oxide, Me3 oxide, Me4 oxide, Me5 oxide and amorphous boron powder; pressing into a green body, heating to 800-1200DEG C, calcining, carrying out washing, suction filtration and drying, heating obtained high-entropy boride powder to 1600-1700DEG C by spark plasma sintering, pressurizing by use of a protective atmosphere, heating to 1700-1900DEG C, and sintering to obtain the high-entropy ceramic. The relative density of the high-entropy ceramic is 95-100%, the fracture toughness of the high-entropy ceramic is 8-20 MPa.m < 1 / 2 >, and the grain size of the high-entropy ceramic is 1-3 microns.

Description

technical field [0001] The invention belongs to the technical field of ceramic processing, and more specifically relates to a high-toughness and high-wear resistance high-entropy ceramic and its preparation method and application. Background technique [0002] Ceramic materials have excellent high temperature resistance, wear resistance, corrosion resistance and other special properties that metal materials cannot match. In addition to being used in parts with high temperature resistance and corrosion resistance, it is also widely used in mechanical parts and ceramic powder processing grinding media, etc., which require wear-resistant crushing, ball milling, cutting tools, deformation molds and many other products used in harsh environments middle. Materials are required to have high wear resistance, so the wear resistance of ceramic materials has begun to attract people's attention. High-entropy ceramics have five or more components. If they are solid-dissolved into singl...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/626C04B35/64
CPCC04B35/58064C04B35/58071C04B35/58078C04B35/6265C04B35/62675C04B35/64C04B2235/3232C04B2235/3244C04B2235/3251C04B2235/3256C04B2235/421C04B2235/6562C04B2235/6567C04B2235/658C04B2235/666C04B2235/786C04B2235/96
Inventor 郭伟明张岩张威吴利翔林华泰
Owner GUANGDONG UNIV OF TECH
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