High-hardness hafnium-based ternary solid solution boride ceramic as well as preparation method and application thereof

A technology of borides and high hardness, which is applied in the field of ceramic materials, can solve the problems of inability to synthesize single-phase, ternary borides, mechanical properties, solid solution elements, sintering performance, etc., and achieve high hardness, high purity, and improved ceramics performance effect

Active Publication Date: 2021-05-25
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot synthesize a single phase (Hf 1 / 3 Zr 1 / 3 Ti 1 / 3 )B 2 powder, in which the boride phase (TiB 2 ) still exists
In addition, the mechanical properties of ternary borides and the effect of solid solution elements on their sintering properties have not yet been determined

Method used

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  • High-hardness hafnium-based ternary solid solution boride ceramic as well as preparation method and application thereof
  • High-hardness hafnium-based ternary solid solution boride ceramic as well as preparation method and application thereof
  • High-hardness hafnium-based ternary solid solution boride ceramic as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Take HfO 2 (Purity of powder 99%, particle size 1 μm), ZrO 2 (Powder purity 99.8%, particle size 1 μm), TiO 2 (powder purity 99%, particle size 0.5 μm), and B 4 C (powder purity 99.9%, particle size 0.5μm), carbon powder (powder purity 99%, particle size 0.8μm) as raw materials, ethanol as solvent, Si 4 N 3 It is a ball milling medium, mixed on a ball mill for 24 hours, and dried to obtain mixed powder;

[0035] 2. Put the molded body of the mixed powder into a graphite crucible, heat it up to 1600 °C at a rate of 10 °C / min for 1 h, and obtain (Hf) by vacuum heat treatment. 1 / 3 Zr 1 / 3 Ti 1 / 3 )B 2 Hafnium-based ternary solid solution boride ceramic powder.

[0036] 3. Put (Hf 1 / 3 Zr 1 / 3 Ti 1 / 3 )B 2 The hafnium-based ternary solid solution boride ceramic powder was put into a graphite mold, heated to 1000°C at a rate of 150°C / min by spark plasma sintering, filled with Ar protective atmosphere, and then heated to 2000°C at a rate of 150°C / min. Heat preserva...

Embodiment 2

[0040] 1. Take HfO 2 (Purity of powder 99%, particle size 1 μm), Ta 2 O 5 (Powder purity 99.8%, particle size 1 μm), TiO 2 (powder purity 99%, particle size 0.5 μm), and B 4 C (powder purity 99.9%, particle size 0.5μm), carbon powder (powder purity 99%, particle size 0.8μm) as raw materials, ethanol as solvent, Si 4 N 3 It is a ball milling medium, mixed on a ball mill for 24 hours, and dried to obtain mixed powder;

[0041] 2. Put the molded body of the mixed powder into a graphite crucible, heat it up to 1600 °C at a rate of 10 °C / min for 1 h, and obtain (Hf) by vacuum heat treatment. 1 / 3 Ta 1 / 3 Ti 1 / 3 )B 2 Hafnium-based ternary solid solution boride ceramic powder.

[0042] 3. Put (Hf 1 / 3 Ta 1 / 3 Ti 1 / 3 )B 2 The hafnium-based ternary solid solution boride ceramic powder was put into a graphite mold, heated to 1000°C at a rate of 150°C / min by spark plasma sintering, filled with Ar protective atmosphere, and then heated to 2000°C at a rate of 150°C / min. Heat pres...

Embodiment 3

[0046] 1. Take HfO 2 (Purity of powder 99%, particle size 2μm), ZrO 2 (Purity of powder 99.8%, particle size 2 μm), Ta 2 O 5 (powder purity 99%, particle size 2μm), and B 4 C (powder purity 99.9%, particle size 2μm), carbon powder (powder purity 99%, particle size 2μm) as raw materials, ethanol as solvent, Si 4 N 3 It is a ball milling medium, mixed on a ball mill for 24 hours, and dried to obtain mixed powder;

[0047] 2. Put the molded body of the mixed powder into a graphite crucible, heat it up to 1600 °C at a rate of 10 °C / min for 1 h, and obtain (Hf) by vacuum heat treatment. 1 / 3 Zr 1 / 3 Ta 1 / 3 )B 2 Hafnium-based ternary solid solution boride ceramic powder.

[0048] 3. Put (Hf 1 / 3 Zr 1 / 3 Ta 1 / 3 )B 2 The hafnium-based ternary solid solution boride ceramic powder was put into a graphite mold, heated to 1000°C at a rate of 150°C / min by spark plasma sintering, filled with Ar protective atmosphere, and then heated to 2000°C at a rate of 150°C / min. Heat preservat...

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Abstract

The invention belongs to the technical field of ceramic materials, and discloses high-hardness hafnium-based ternary solid solution boride ceramic as well as a preparation method and application thereof. The molecular formula of the boride ceramic is (HfaMe1bMe2c)B2, 0.1</=a</=0.9, 0<b<0.9, 0<c<0.9, and a+b+c=1; Me1 and Me2 are Zr, Ta or Ti. The ceramic is prepared by the following steps of adding HfO2, Me1 and Me2 oxides, B4C and carbon powder into a solvent, carrying out ball milling to obtain mixed powder, carrying out die pressing to obtain a blank, putting the blank into a graphite crucible, heating to 1400-1600 DEG C, carrying out heat preservation, and carrying out vacuum heat treatment to obtain hafnium-based ternary solid solution boride powder, and heating the ternary solid solution boride powder to 1000-1400 DEG C by adopting spark plasma sintering, introducing a protective atmosphere, heating to 1900-2100 DEG C, and calcining at the pressure of 10-100 MP to obtain the ternary solid solution boride powder.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and more particularly relates to a high-hardness hafnium-based ternary solid solution boride ceramic and a preparation method and application thereof. Background technique [0002] Hafnium Diboride (HfB 2 ), as an ultra-high temperature ceramic (UHTC), has been favored by people for its extremely high melting point (3380°C), high Young's modulus (~500GPa), high hardness (18-21GPa), excellent high temperature performance and chemical stability. s concern. HfB2 ceramics are expected to be used in fields such as the supersonic aerospace industry and high temperature components (>3000°C). Compared with single-component materials, the preparation of solid solution ceramics can effectively improve the sinterability of boride ceramics and overcome the challenges of densification. Solid solution materials exhibit better mechanical properties and thermal stability. Solid solution of MeB2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58
CPCC04B35/58078C04B35/58071C04B35/58064C04B2235/3244C04B2235/3251C04B2235/3232C04B2235/3821C04B2235/422C04B2235/666C04B2235/5436C04B2235/77C04B2235/96C04B2235/6562C04B2235/6567
Inventor 黄梓键郭伟明张岩许亮林华泰
Owner GUANGDONG UNIV OF TECH
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