Preparation process of rod-like ZrB2 toughened ZrB2-SiC ultrahigh-temperature ceramic

A technology of ultra-high temperature ceramics and preparation process, which is applied in the field of preparation of structural ceramics, can solve the problems of poor toughness of zirconium boride ultra-high temperature ceramics, and achieve the benefits of wire cutting processing, improved fracture toughness, and good oxidation and ablation resistance Effect

Inactive Publication Date: 2014-12-24
SHANDONG UNIV OF TECH
View PDF4 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the problem of poor toughness of existing zirconium boride ultra-high temperature ceramics, and provide rod-shaped 2 Toughened ZrB 2 -Preparation process of SiC ultra-high temperature ceramics

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Weigh 425.6 grams of rod-shaped zirconium boride powder and 96 grams of silicon carbide powder, that is, the volume percentage of rod-shaped zirconium boride powder and silicon carbide powder is 70%: 30%, and the diameter of rod-shaped zirconium boride powder is 0.5 μm. The length is 3 μm, the particle size of silicon carbide powder is 0.5 μm, add 521.6 grams of absolute ethanol, stir well and add binder and plasticizer, the binder is 10.4 grams of polyvinyl butyral; 10.4 grams of plasticizer The agent is polyethylene glycol, and the second stirring forms a uniform ceramic suspension;

[0025] 2) Use a rotary evaporator to vacuum-dry the ceramic suspension to form a mixed powder;

[0026] 3) Put the mixed powder into a graphite abrasive tool, and vacuum degrease. When degreasing, the heating rate is 1°C / min, and the temperature is raised to 600°C, and kept for 1h;

[0027] 4) Hot-press sintering under argon atmosphere, the sintering temperature is 1900°C, the heat p...

Embodiment 2

[0029] 1) Weigh 547.2 grams of rod-shaped zirconium boride powder and 32 grams of silicon carbide powder, that is, rod-shaped zirconium boride powder and silicon carbide powder are mixed at a volume percentage of 90%:10%, and the diameter of the rod-shaped zirconium boride powder is 2 μm, the length is 10 μm, the particle size of silicon carbide powder is 2 μm, add 1737.6 grams of absolute ethanol, stir well and add binder and plasticizer, the binder is 29 grams of polyvinyl butyral; plasticizer Be 29 grams of polyvinyl alcohol, stir twice to form a uniform ceramic suspension;

[0030] 2) Use a rotary evaporator to vacuum-dry the ceramic suspension to form a mixed powder;

[0031] 3) Put the mixed powder into a graphite abrasive tool and vacuum degrease. When degreasing, the heating rate is 3°C / min, the temperature is raised to 700°C, and the temperature is kept for 0.5h;

[0032] 4) Hot-press sintering under argon atmosphere, the sintering temperature is 2000°C, the heat pre...

Embodiment 3

[0034] 1) Weigh 486.4 grams of rod-shaped zirconium boride powder and 64 grams of silicon carbide powder, that is, rod-shaped zirconium boride powder and silicon carbide powder are mixed at a volume percentage of 80%:20%, and the diameter of the rod-shaped zirconium boride powder is 1μm, the length is 5μm, the particle size of silicon carbide powder is 1μm, add 1100.8 grams of absolute ethanol, stir well and add binder and plasticizer, the binder is polyvinyl butyral; the plasticizer is The mixing of polyethylene glycol and polyvinyl alcohol takes by weighing 22 grams of polyvinyl butyral, 11 grams of polyethylene glycol, and 11 grams of polyvinyl alcohol, and stirs twice to form a uniform ceramic suspension;

[0035] 2) Use a rotary evaporator to vacuum-dry the ceramic suspension to form a mixed powder;

[0036] 3) Put the mixed powder into a graphite abrasive tool, and vacuum degrease. When degreasing, the heating rate is 2°C / min, and the temperature is raised to 650°C, and ...

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
diameteraaaaaaaaaa
lengthaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention provides a preparation process of a rod-like ZrB2 toughened ZrB2-SiC ultrahigh-temperature ceramic. The preparation process is characterized by comprising the following steps: (1) adding zirconium boride ceramic powder into a solvent, uniformly stirring, adding a bonder and a plasticizer, and stirring for the second time to form uniform ceramic suspension, wherein the zirconium boride ceramic powder is formed by mixing rod-like zirconium boride powder with silicon carbide powder according to a volume percent ratio of (70%-90%) to (10%-30%); (2) drying the ceramic suspension in vacuum by adopting a rotary evaporator to form mixed powder; (3) degreasing the mixed powder in vacuum in a graphite grinding tool, and during degreasing, heating to 600-700 DEG C at the speed of 1-3 DEG C / min and preserving heat for 0.5-1 hour; and (4) performing hot pressed sintering in an argon gas atmosphere at 1,900-2,000 DEG C under the pressure of 20-40MPa for 0.5-2 hours to obtain the rod-like ZrB2 toughened ZrB2-SiC ultrahigh-temperature ceramic. The preparation process is simple; the obtained ceramic material is relatively good in oxidative ablation resistance, remarkably improved in fracture toughness and good in processability.

Description

technical field [0001] The present invention provides rod ZrB 2 Toughened ZrB 2 - The preparation process of SiC ultra-high temperature ceramics belongs to the technical field of preparation of structural ceramics. Background technique [0002] ZrB 2 Ceramics have been considered as one of the most promising materials in the family of ultra-high temperature ceramics (UHTCs) due to their superior high temperature and corrosion resistance properties and relatively low theoretical density. Currently, ZrB 2 Ceramics have been widely used as various high-temperature structural and functional materials, such as: turbine blades in the aviation industry, electrodes for magnetic fluid power generation, etc. But ZrB 2 Ceramics have low strength and fracture toughness, which limits their application in harsh operating environments, such as the nose cone and leading edge of supersonic aircraft, hot-end parts of scramjet engines, etc. Therefore, in order to ensure the reliability a...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/58C04B35/622
Inventor 冯柳魏春城刘晓燕
Owner SHANDONG UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap