Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

ZrB2 ceramic with high thermal conductivity as well as preparation method and application of ZrB2 ceramic

A high thermal conductivity, zirconium boride technology, applied in the field of ultra-high temperature ceramic materials, can solve the problems of limited application, thermal resistance is not well solved, etc., to achieve the effect of improving density and reducing oxygen content

Active Publication Date: 2018-12-14
GUANGDONG UNIV OF TECH
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its heat resistance performance has not been well resolved. In order to better quickly spread the heat from the hot end of the hypersonic vehicle to the cold end, the protective material is required to have higher thermal conductivity.
Due to the influence of factors such as oxygen impurities, grain size, and density, the ZrB prepared by the prior art 2 The thermal conductivity of polycrystalline ceramics is generally between 40 and 80 W m at room temperature -1 ·K -1 between, which limits its further application in various fields

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • ZrB2 ceramic with high thermal conductivity as well as preparation method and application of ZrB2 ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Preparation:

[0026] (1) with ZrB 2 powder (purity 99%, particle size 0.8μm) as raw material, with B 2 o 3 (purity 99%, particle size 1μm) as a catalyst to promote grain growth, B powder (purity 99.9%, particle size 0.3μm) and C powder (purity 99.9%, particle size 0.33μm) as oxygen removal sintering aids . Press ZrB 2 :B 2 o 3 The mass ratio of B:C is 85:10:2:3 for batching, with ethanol as solvent, ZrB 2 The ball is used as the ball milling medium, and it is milled and mixed on a planetary ball mill at a speed of 200r / min for 4 hours. After mixing and drying, ZrB 2 -B 2 o 3 -B-C mixed powder;

[0027] (2) ZrB 2 -B 2 o 3 -Put the B-C mixed powder into a graphite mold, apply a pressure of 30MPa at a vacuum degree of <20Pa, raise the temperature to 1200°C at a rate of 10°C / min, and keep it warm for 2h;

[0028] (3) Then fill in 1 atm of argon, then raise the temperature to 1950°C at a rate of 10°C / min, and keep it warm for 2 hours. After the heat preserv...

Embodiment 2

[0031] 1. Preparation:

[0032] (1) with ZrB 2 powder (purity 99%, particle size 0.8μm) as raw material, with B 2 o 3 (purity 99%, particle size 1μm) as a catalyst to promote grain growth, B powder (purity 99.9%, particle size 0.3μm) and C powder (purity 99.9%, particle size 0.33μm) as oxygen removal sintering aids . Press ZrB 2 :B 2 o 3 : B: C mass ratio is 90:5:2:3 for batching, with ethanol as solvent, ZrB 2 The ball is used as the ball milling medium, and it is milled and mixed on a planetary ball mill at a speed of 200r / min for 4 hours. After mixing and drying, ZrB 2 -B 2 o 3 -B-C mixed powder;

[0033] (2) ZrB 2 -B 2 o 3 -Put the B-C mixed powder into a graphite mold, apply a pressure of 30MPa at a vacuum degree of <20Pa, raise the temperature to 1200°C at a rate of 10°C / min, and keep it warm for 2h;

[0034] (3) Then fill in 1 atm of argon, then raise the temperature to 1950°C at a rate of 10°C / min, and keep it warm for 2 hours. After the heat preservation...

Embodiment 3

[0037] 1. Preparation:

[0038] (1) with ZrB 2 powder (purity 99%, particle size 0.8μm) as raw material, with B 2 o 3 (purity 99%, particle size 1μm) as a catalyst to promote grain growth, B powder (purity 99.9%, particle size 0.3μm) and C powder (purity 99.9%, particle size 0.33μm) as oxygen removal sintering aids . Press ZrB 2 :B 2 o 3 The mass ratio of B:C is 85:10:2:3 for batching, with ethanol as solvent, ZrB 2 The ball is used as the ball milling medium, and it is milled and mixed on a planetary ball mill at a speed of 200r / min for 4 hours. After mixing and drying, ZrB2-B 2 o 3 -B-C mixed powder;

[0039] (2) ZrB 2 -B 2 o 3 -Put the B-C mixed powder into a graphite mold, apply a pressure of 30MPa at a vacuum degree of <20Pa, raise the temperature to 1100°C at a rate of 10°C / min, and keep it warm for 2h;

[0040] (3) Then fill in 1 atm of argon, then raise the temperature to 1850°C at a rate of 10°C / min, and keep it warm for 2 hours. After the heat preservati...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Thermal conductivityaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of ultra-high-temperature ceramics, and discloses ZrB2 ceramic with high thermal conductivity as well as a preparation method and an application of the ZrB2 ceramic. According to preparation of the ZrB2 ceramic, sintering aids B and C are added to ZrB2 as a raw material and B2O3 as a catalyst, the substances are mixed, ZrB2-B2O3-B-C mixed powder is obtained and sieved, and the ZrB2 ceramic is prepared by hot pressed sintering. The method has the advantages of simple process and low cost; the prepared ZrB2 ceramic has high thermal conductivity, relative density of the ZrB2 ceramic is higher than 95%, the thermal conductivity is higher than 100W / (m.k), and the ZrB2 ceramic can be applied to the field of aerospace and is particularly expected to beapplied to key positions such as nose cones and leading edges of hypersonic flight vehicles.

Description

technical field [0001] The invention belongs to the technical field of ultra-high temperature ceramic materials, and more specifically relates to a high thermal conductivity zirconium boride ceramic (ZrB 2 ) and its preparation method and application. Background technique [0002] Ultra-high temperature ceramics mainly include transition metal borides, carbides, nitrides and their corresponding multiphase ceramics with a melting point >3000°C, such as ZrB 2 , HfB 2 , ZrC, HfC, ZrB 2 -SiC, HfB 2 -SiC, etc., are important thermal protection structural materials. In the ultrahigh temperature ceramic family, ZrB 2 Based ultra-high temperature ceramics have excellent characteristics such as high melting point, low density and high strength. It has wide application prospects in aerospace, energy, machinery and other fields, especially in the protective materials of hypersonic vehicles. However, its heat resistance performance has not been well resolved. In order to quick...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B35/58C04B35/622
CPCC04B35/58078C04B35/622C04B2235/3409C04B2235/421C04B2235/422C04B2235/5445C04B2235/6562C04B2235/6567C04B2235/661C04B2235/9607
Inventor 郭伟明曾令勇魏万鑫林华泰
Owner GUANGDONG UNIV OF TECH
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com