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Method for preparing high-toughness complex-phase high-entropy ceramic by using solid solution coupling method and application of high-toughness complex-phase high-entropy ceramic

A high-strength, ceramic technology, applied in the field of ceramic materials, can solve the problems of mechanical properties and anti-oxidation properties that need to be improved, and achieve the effect of small grain size, promotion of mass transfer process, strength and toughness improvement.

Active Publication Date: 2022-04-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the multiphase ceramics composed of diboride-carbides prepared by the existing method still need to be improved in terms of high temperature performance stability, mechanical properties and oxidation resistance, and provide a solid solution coupling method Preparation method and application of high-strength and toughness multi-phase high-entropy ceramics

Method used

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  • Method for preparing high-toughness complex-phase high-entropy ceramic by using solid solution coupling method and application of high-toughness complex-phase high-entropy ceramic
  • Method for preparing high-toughness complex-phase high-entropy ceramic by using solid solution coupling method and application of high-toughness complex-phase high-entropy ceramic
  • Method for preparing high-toughness complex-phase high-entropy ceramic by using solid solution coupling method and application of high-toughness complex-phase high-entropy ceramic

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specific Embodiment approach 1

[0022] Specific implementation mode 1: In this implementation mode, a method for preparing high-strength and toughness multi-phase high-entropy ceramics by using solid solution coupling method is completed according to the following steps:

[0023] 1. Preparation of composite powder:

[0024] ①. Weigh titanium diboride, zirconium diboride, hafnium diboride, niobium diboride and tantalum diboride powders according to equimolar ratio to obtain diboride mixed powder I;

[0025] ②. Weigh titanium carbide, zirconium carbide, hafnium carbide, niobium carbide and tantalum carbide powder according to equimolar ratio to obtain carbide mixed powder II;

[0026] ③, mix the diboride mixed powder I and the carbide mixed powder II, and ball mill to obtain a composite powder;

[0027] The mole fraction of the diboride mixed powder I in the composite powder described in step 1.3 is 30% to 70%;

[0028] 2. Put the composite powder in the mold, then put it into the discharge plasma sintering ...

specific Embodiment approach 2

[0029] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mole fraction of the diboride mixed powder I in the composite powder described in step 1 ③ is 50%. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: titanium diboride, zirconium diboride, hafnium diboride, niobium diboride and diboron described in step 1. The purity of the tantalum oxide powders is all >99.0wt.%, and the particle size D50 of the powders is all in the range of 0.1-10 μm. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for preparing high-toughness complex-phase high-entropy ceramic by using a solid solution coupling method and application, belongs to the technical field of ceramic materials, and particularly relates to a method for preparing high-toughness complex-phase high-entropy ceramic and application. The method comprises the following steps: 1, preparing composite powder; and 2, carrying out solid solution coupling to obtain the high-toughness complex-phase high-entropy ceramic. The invention discloses application of high-toughness complex-phase high-entropy ceramic in the field of ultra-high temperature and cutting tools. According to the invention, a plurality of diborides and carbides are subjected to solid solution coupling in the sintering process, so that the mass transfer process is greatly promoted, and the compactness of the prepared composite ceramic is greater than 97.2%; the grain size of the prepared high-toughness complex-phase high-entropy ceramic is smaller, meanwhile, the strength and the toughness are remarkably improved, and the fracture toughness can reach 5.8 MPa.m < 1 / 2 >. According to the invention, the high-toughness complex-phase high-entropy ceramic can be obtained.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a method and application for preparing high-strength and toughness multi-phase high-entropy ceramics. Background technique [0002] In recent years, with the rapid development of aerospace, machinery, metallurgy, nuclear energy, chemical industry, military industry and other fields, the requirements for material performance have become more and more stringent. Meet the needs. Inspired by high-entropy alloys, high-entropy ceramics are solid-solution ceramics formed by five or more components. In the past five years, a large number of reported studies on high-entropy borides, carbides, nitrides, oxides, and silicides have made high-entropy ceramics gradually become a research hotspot. Significant solid-solution strengthening and high-entropy effects endow high-entropy ceramics with high hardness, excellent oxidation resistance, and low thermal conductivity. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622C04B35/64C04B35/645
Inventor 霍思嘉陈磊王玉金毛明煊周玉
Owner HARBIN INST OF TECH