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Transition metal diboride high-entropy ceramic and preparation method thereof

A diboride and transition metal technology, applied in the field of ultra-high temperature structural ceramic materials, can solve the problems of poor oxidation resistance, low sample toughness, and difficulty in densification, and achieve the effects of high density, good product performance and high yield.

Inactive Publication Date: 2019-05-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of low toughness, poor oxidation resistance, poor hardness and difficulty in densification of samples prepared by traditional preparation methods

Method used

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  • Transition metal diboride high-entropy ceramic and preparation method thereof
  • Transition metal diboride high-entropy ceramic and preparation method thereof
  • Transition metal diboride high-entropy ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: select vanadium diboride, niobium diboride, tantalum diboride, molybdenum diboride and tungsten diboride powder as initial raw materials, vanadium diboride, niobium diboride, tantalum diboride, Molybdenum diboride and tungsten diboride are configured according to the molar ratio of 1:1:1:1:1. The above raw materials were subjected to high-energy ball milling, the grinding balls were WC-8wt%Co cemented carbide balls, the ball-to-material ratio was 10:1, the ball milling rate was 400 r / min and the ball milling time was 24 hours. The powder after ball milling is treated with dilute pickling, and the treated powder is placed in a high-temperature vacuum furnace for vacuum treatment at 800 °C, with a vacuum degree of 1×10 -2 Pa, holding time 60 minutes. Then put it into a high-melting-point wrapping material for encapsulation and pre-press under a pressure of 580 MPa to obtain a cylindrical inclusion, and then put it into a salt tube in a pyrophyllite synthet...

Embodiment 2

[0025] Embodiment 2: select vanadium diboride, niobium diboride, tantalum diboride, molybdenum diboride and tungsten diboride powder as initial raw materials, vanadium diboride, niobium diboride, tantalum diboride, Molybdenum diboride and tungsten diboride are configured according to the molar ratio of 1:1:1:1:1. The above raw materials were subjected to high-energy ball milling, the grinding balls were WC-8wt%Co cemented carbide balls, the ball-to-material ratio was 10:1, the ball milling rate was 400 r / min and the ball milling time was 24 hours. The powder after ball milling is treated with dilute pickling, and the treated powder is placed in a high-temperature vacuum furnace for vacuum treatment at 800 °C, with a vacuum degree of 1×10 -2Pa, holding time 60 minutes. Then put it into a high-melting-point wrapping material for encapsulation and pre-press under a pressure of 580 MPa to obtain a cylindrical inclusion, and then put it into a salt tube in a pyrophyllite synthetic...

Embodiment 3

[0026] Embodiment 3: select vanadium diboride, niobium diboride, tantalum diboride, molybdenum diboride and tungsten diboride powder as initial raw materials, vanadium diboride, niobium diboride, tantalum diboride, Molybdenum diboride and tungsten diboride are configured according to the molar ratio of 1:1:1:1:1. The above raw materials were subjected to high-energy ball milling, the grinding balls were WC-8wt%Co cemented carbide balls, the ball-to-material ratio was 8:1, the ball milling rate was 450 r / min, and the ball milling time was 24 hours. The powder after ball milling is treated with dilute pickling, and the treated powder is placed in a high-temperature vacuum furnace for vacuum treatment at 800 °C, with a vacuum degree of 1×10 -2 Pa, holding time 60 minutes. Then put it into a high-melting-point wrapping material for encapsulation and pre-press under a pressure of 580 MPa to obtain a cylindrical inclusion, and then put it into a salt tube in a pyrophyllite synthet...

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Abstract

The invention discloses a transition metal diboride high-entropy ceramic and a preparation method thereof, mainly relates to a high-entropy ceramic material with excellent performance, and belongs tothe field of high-temperature ceramics. At least five IVB, VB and VIB groups of transition metal boride powder is mixed according to the same mole ratio, high-energy ball milling and vacuum treatmentof mixture are implemented, the mixture is packaged and pre-pressed by high-melting-point packaging material, and the packaged mixture is sintered at the pressure of 4-10GPa and at the temperature of1000-1800 DEG C to form the diboride high-entropy ceramic. The diboride high-entropy ceramic is firstly prepared by a high-temperature and high-pressure method and has the advantages of high breakingtenacity, compactness and hardness, small grain size, excellent oxidation resistance and the like. the method has the advantages that the method is low in cost, environmentally friendly, simple in sintering process, good in product performance and high in finished product ratio, and raw materials are easily acquired. Industrial production is facilitated.

Description

technical field [0001] The invention relates to a transition metal diboride high-entropy ceramic, in particular to a high-temperature structural material transition metal diboride high-entropy ceramic and a preparation method thereof, belonging to the field of ultra-high temperature structural ceramic materials. Background technique [0002] Ultra-high temperature ceramics (UHTCs) materials are a class of transition metal borides, carbides, nitrides and oxides with a high melting point above 3000 °C and excellent high-temperature oxidation resistance, corrosion resistance and thermal shock resistance. Among them, IVB, VB and VIB transition metal borides (TBMs) have high melting point, high hardness, excellent high temperature oxidation resistance, and good thermal conductivity and electrical conductivity, and are an important material for the manufacture of high temperature heating elements. materials and high temperature structural materials for aerospace. However, at pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622C04B35/645
Inventor 梁浩彭放管诗雪
Owner SICHUAN UNIV
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