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Tungsten mesh toughened hafnium carbonitride-based metal ceramic and preparation method thereof

A hafnium carbonitride matrix, carbonitriding technology, applied in the field of tungsten mesh toughened hafnium carbonitride-based cermets and its preparation, can solve the problem of low fracture toughness, achieve short preparation cycle and easy preparation process , The effect of simple preparation process

Active Publication Date: 2020-06-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the defect of low fracture toughness in the ultra-high temperature ablation-resistant ceramics in the prior art, the purpose of the present invention is to provide a tungsten mesh toughened hafnium carbonitride-based cermet with excellent thermal shock resistance and excellent ablation resistance and its preparation method, the tungsten mesh toughened hafnium carbonitride-based cermet (HfC x N y ) is suitable for ultra-high temperature anti-ablation protection at 3000°C. After long-term ablation, the cermet remains intact without brittle fracture, and has a stable anti-oxidation protection structure

Method used

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  • Tungsten mesh toughened hafnium carbonitride-based metal ceramic and preparation method thereof
  • Tungsten mesh toughened hafnium carbonitride-based metal ceramic and preparation method thereof
  • Tungsten mesh toughened hafnium carbonitride-based metal ceramic and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0042]Mix HfC powder, HfN powder, carbon powder, and carbon nitride powder, and then ball mill it on a planetary ball mill for 10 hours. ℃ in a drying oven for 8 hours, and the mixed powder was obtained after sieving. The purity of each raw material powder is greater than 99.9%, and the average particle size of the powder is 1um. In the mixed powder, the mass ratio of HfC powder to HfN powder is 3:2; and the mass fraction of carbon powder in the mixed powder is 5%. The mass fraction of carbon nitride in the mixed powder is 5%.

[0043] Select a 100-mesh tungsten mesh with a purity greater than 99.9%. After 30 minutes of ultrasonic cleaning with ethanol, it is dried and taken out, and cut into the diameter of the abrasive tool. Then the mixed powder and tungsten mesh are evenly and alternately placed in the graphite mold, arranged in 5 layers, the thickness of the sintered body is 10mm, and the discharge plasma sintering is carried out. The vacuum degree in the furnace is less...

Embodiment 2

[0045] Mix HfC powder, HfN powder, carbon powder, and carbon nitride powder, and then ball mill it on a planetary ball mill for 12 hours. Dry in a drying oven at ℃ for 10 hours, and obtain mixed powder after sieving, wherein the purity of each raw material powder is greater than 99.9%, and the average particle size of the powder is 1um. In the mixed powder, the mass ratio of HfC powder to HfN powder is 2:1; while the mass fraction of carbon powder in the mixed powder is 4%, and the mass fraction of carbon nitride in the mixed powder is 4%.

[0046] Select 80-mesh tungsten mesh with a purity greater than 99.9%. After 20 minutes of ultrasonic cleaning with ethanol, it is dried and taken out, and cut into the diameter of the abrasive tool. Then place the mixed powder and tungsten mesh evenly and alternately in the graphite mold, a total of four layers of tungsten mesh, the thickness of the sintered body is 8mm, and conduct spark plasma sintering. To 2100°C, keep warm for 15 minu...

Embodiment 3

[0048] Mix HfC powder, HfN powder, carbon powder, and carbon nitride powder, and then ball mill it on a planetary ball mill for 12 hours. The ball milling medium is ethanol solution, the speed is 200r / min, the ratio of ball to material is 9:1, and then placed at 70°C Dry it in a drying oven for 10 hours, and obtain the mixed powder after sieving. The purity of each raw material powder is greater than 99.9%, and the average particle size of the powder is 1um. In the mixed powder, the mass ratio of HfC powder to HfN powder is 3:1; and the mass fraction of carbon powder in the mixed powder is 3%, The mass fraction of carbon nitride in the mixed powder is 4%.

[0049] Select 120-mesh tungsten mesh with a purity greater than 99.9%, and dry it after ultrasonic treatment with ethanol. Cut to the size of the abrasive tool diameter, then place the mixed powder and tungsten mesh evenly and alternately in the graphite mold, a total of six layers of tungsten mesh, the thickness of the si...

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Abstract

The invention discloses tungsten mesh toughened hafnium carbonitride-based metal ceramic and a preparation method thereof. The tungsten mesh toughened hafnium carbonitride-based metal ceramic is composed of a hafnium carbonitride matrix and tungsten meshes distributed in the hafnium carbonitride matrix at intervals. The preparation method comprises the following steps: mixing HfC powder, HfN powder, carbon powder and carbon nitride powder, ball-milling the mixture, and drying and sieving the ball-milling product to obtain mixed powder, wherein in the mixed powder, the mass ratio of the HfC powder to the HfN powder is (1-7): 1; alternately stacking and laying the mixed powder and the tungsten meshes in a mold to obtain a to-be-sintered body; and performing spark plasma sintering on the to-be-sintered body to obtain the tungsten mesh toughened hafnium carbonitride-based metal ceramic. The tungsten mesh toughened hafnium carbonitride-based metal ceramic provided by the invention has excellent thermal shock resistance and ablation resistance.

Description

technical field [0001] The invention belongs to the technical field of carbide ceramics, in particular to a tungsten mesh toughened hafnium carbonitride-based cermet and a preparation method thereof. Background technique [0002] Ultra-high temperature ceramics generally refer to transition metal carbides, borides, nitrides and their composite ceramics with a melting point greater than 3000 ° C, such as HfC, ZrC, ZrB 2 Wait. Ultra-high temperature ceramics and their composite materials have the advantages of high melting point, low density, high strength, excellent chemical stability, etc., and are widely used in aerospace, energy and other fields. The physical connotation and excellent material properties have attracted the attention of researchers. On the one hand, the valence electron concentration and coordination number of transition metal elements are relatively high, while the atomic radii of light elements such as C and N are small, and it is easy to form covalent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/76C04B35/622
CPCC04B35/58035C04B35/622C04B35/76C04B2235/3839C04B2235/3852C04B2235/3886C04B2235/422C04B2235/5436C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/6581C04B2235/666C04B2235/9615
Inventor 孙威彭峥熊翔
Owner CENT SOUTH UNIV
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