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High-entropy diboride-boron carbide composite ceramic as well as preparation method and application thereof

A technology of diboride and multiphase ceramics, applied in the field of multiphase ceramics, can solve the problems of easy introduction of oxygen pollution, large grain size, high entropy effect and limited improvement of relative material properties, and achieves wide application prospects, High hardness, remarkable effect of grain refinement

Active Publication Date: 2021-11-12
安徽工业大学科技园有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to solve the problem that the high-entropy diboride ceramic composite material prepared by the existing high-temperature sintering method has a large grain size and is easy to introduce oxygen pollution. The problem of high entropy effect and limited improvement of relative material performance is provided, and a high entropy diboride-boron carbide composite ceramic, preparation method and application thereof are provided

Method used

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  • High-entropy diboride-boron carbide composite ceramic as well as preparation method and application thereof
  • High-entropy diboride-boron carbide composite ceramic as well as preparation method and application thereof
  • High-entropy diboride-boron carbide composite ceramic as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The molar parts of raw materials are as follows: 1 part of titanium carbide, 1 part of zirconium carbide, 1 part of hafnium carbide, 1 part of niobium carbide, 1 part of tantalum carbide, and 32 parts of boron powder. The preparation process is as follows: (1) put the carbide powder and boron powder into a polyethylene bottle, add zirconia balls and absolute ethanol, and ball mill and mix for 24 hours; (2) evaporate the mixed slurry on a rotary evaporator (3) pass the dried powder through a 200-mesh standard sieve; (4) put the sieved powder into a graphite mold, and sinter In the furnace, the temperature was raised to 2000°C at a rate of 100°C / min, while the pressure was increased to 40MPa, vacuum sintered for 6 minutes, and then the temperature was lowered and the pressure reduced; (5) demoulding, and the sintered ceramic sample was taken out.

[0030] The X-ray diffraction patterns of the obtained in situ self-generated high-entropy diboride-boron carbide composite ce...

Embodiment 2

[0032] The molar parts of raw materials are as follows: 1 part of titanium carbide, 1 part of zirconium carbide, 1 part of hafnium carbide, 1 part of niobium carbide, 1 part of tantalum carbide, 1 part of vanadium carbide, and 38.5 parts of boron powder. The preparation process is the same as in Example 1, and will not be repeated here.

[0033] The X-ray diffraction patterns of the obtained in situ self-generated high-entropy diboride-boron carbide composite ceramics are as attached figure 1 As shown in b, the main phases include high-entropy diboride and boron carbide. The grain size of high-entropy diboride and boron carbide in composite ceramics is about 1 μm, and the metal elements in the high-entropy phase are evenly distributed (attached figure 2 ). The Vickers hardness (Hv5) of the composite ceramics is 21.3±0.8GPa, the flexural strength is 478±49MPa, and the fracture toughness is 5.80±0.55MPa m 1 / 2 .

Embodiment 3

[0035] The parts by weight of raw materials are as follows: 1 part of titanium carbide, 1 part of zirconium carbide, 1 part of hafnium carbide, 1 part of niobium carbide, 1 part of tantalum carbide, 0.25 part of tungsten carbide, and 33.6 parts of boron powder. The preparation process is the same as in Example 1, and will not be repeated here.

[0036] The X-ray diffraction pattern of the obtained in-situ self-generated high-entropy diboride-boron carbide composite ceramics is as follows: figure 1 As shown in c, the main phases include high-entropy diboride and boron carbide. The Vickers hardness (Hv5) of the composite ceramic is 20.9±0.5GPa, the flexural strength is 561±72MPa, and the fracture toughness is 4.45±0.61MPa m 1 / 2 .

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Abstract

The invention relates to the technical field of multiphase ceramics, in particular to a high-entropy diboride-boron carbide multiphase ceramic as well as a preparation method and application thereof. The composite ceramic comprises a mixture of the following molar components: 5-9 kinds of transition metal carbides (titanium carbide, zirconium carbide, hafnium carbide, niobium carbide, tantalum carbide, vanadium carbide, chromium carbide, molybdenum carbide and tungsten carbide) each with the amount of 0-1 part, and boron powder with the amount of 32-60 parts. The transition metal carbides are powder, the purity is greater than 98%, and the particle size is 0.5-3 microns. The purity of the boron powder is greater than 95%, and the particle size is 0.5-3 microns. The Vickers hardness Hv5 of the high-entropy diboride-boron carbide composite ceramic is greater than or equal to 20 GPa, the bending strength is greater than or equal to 420 MPa, and the fracture toughness is greater than or equal to 5.0 MPa*m<1 / 2>. According to the invention, rapid in-situ synthesis preparation of the light, high-toughness and high-entropy diboride-boron carbide composite ceramic is realized, and the sintering temperature is low, so that the high-entropy diboride-boron carbide multiphase ceramic has a wide application prospect in the fields of ultrahigh-temperature materials, superhard materials, ceramic cutters and the like.

Description

technical field [0001] The invention relates to the technical field of composite ceramics, in particular to a high-entropy diboride-boron carbide composite ceramic, a preparation method and an application thereof. Background technique [0002] Ultra-high temperature materials usually refer to a class of materials whose service temperature exceeds 2000 °C. Usually include refractory metals, carbon materials and ultra-high temperature ceramics (borides, carbides and nitrides of transition metals). [0003] High-entropy borides, carbides, and nitrides have high strength, high hardness, and high-entropy effects that traditional ceramic materials do not have, resulting in excellent oxidation resistance and corrosion resistance. It is of great value to the development and application of new ultra-high temperature heat-resistant materials, wear-resistant, anti-oxidation high-speed cutting tools and drill bits and other mechanical parts. [0004] Although high-entropy boride ceram...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622C04B35/645
CPCC04B35/563C04B35/622C04B35/645C04B2235/3839C04B2235/3847C04B2235/3843C04B2235/421C04B2235/5445C04B2235/5436C04B2235/666C04B2235/6562C04B2235/6567C04B2235/786C04B2235/77C04B2235/96
Inventor 冉松林王东丁祥金星李庆归
Owner 安徽工业大学科技园有限公司
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