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Process for preparing laminar zirconium boride superhigh-temperature ceramic by casting-impregnation method

A technology of ultra-high temperature ceramics and zirconium boride, applied in chemical instruments and methods, ceramic layered products, layered products, etc., can solve the problems of poor toughness of zirconium boride ultra-high temperature ceramics, achieve improved fracture toughness, increase The effect of extending the path

Inactive Publication Date: 2011-09-07
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of poor toughness of existing zirconium boride ultra-high temperature ceramics, and to provide a method for preparing layered zirconium boride ultra-high temperature ceramics by casting-dipping method

Method used

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  • Process for preparing laminar zirconium boride superhigh-temperature ceramic by casting-impregnation method
  • Process for preparing laminar zirconium boride superhigh-temperature ceramic by casting-impregnation method
  • Process for preparing laminar zirconium boride superhigh-temperature ceramic by casting-impregnation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Preparation of zirconium boride cast sheet: Weigh 2.61 grams of polyvinyl butyral, 2.61 grams of polyethylene glycol, and 52.23 grams of ethanol, stir to make the mixture uniform, and then add 42.63 grams of 1μm zirconium boride powder, 9.60 grams of 0.5μm silicon carbide powder, stir evenly to form a cast material, cast, dry and demold at room temperature to obtain a 1000μm thick cast sheet, in which zirconium boride powder and silicon carbide powder are 70%: 30% by volume Weigh

[0024] 2. Dipping: Weigh 2 grams of polyethylene glycol into 100 grams of deionized water and stir evenly, then add 10 grams of graphite to form a slurry; then use the dipping method to immerse the casting sheet in the graphite slurry, and immerse the casting sheet , Pull 1 time by dipping;

[0025] 3. Cut the cast sheet according to the size of the mold;

[0026] 4. Superimpose the sliced ​​cast sheet into the abrasive tool, vacuum degreasing, and during degreasing, the heating rate is 2℃ / min,...

Embodiment 2

[0029] 1. Preparation of zirconium boride cast sheet: first weigh 5.51g polyvinyl butyral, 5.51g polyethylene glycol, 82.68g ethanol, stir to mix evenly, then add 48.72g 2μm zirconium boride powder, 6.40 grams of 1μm silicon carbide powder, stir evenly to form a cast material, cast, dry and demold at room temperature to obtain a 300μm thick cast sheet, in which zirconium boride powder and silicon carbide powder are weighed according to the volume percentage of 80%:20% take;

[0030] 2. Immersion: Weigh 3 grams of polyethylene glycol into 200 grams of deionized water and stir evenly, then add 10 grams of boron nitride to form a slurry; then use the dipping method to immerse the casting sheet in the graphite slurry, and cast The sheet is dipped and pulled twice by dipping;

[0031] 3. Cut the cast sheet according to the size of the mold;

[0032] 4. Superimpose the sliced ​​cast sheet into the abrasive tool, vacuum degreasing, and during degreasing, the heating rate is 2.5°C / min, the...

Embodiment 3

[0035] 1. Preparation of zirconium boride cast sheet: first weigh 4.06 grams of polyvinyl butyral, 4.06 grams of polyvinyl alcohol, and 116.02 grams of ethanol, stir to mix evenly, then add 54.81 grams of 5μm zirconium boride powder, 3.20 G 2μm silicon carbide powder, stir evenly to form a cast material, cast, dry and demold at room temperature to obtain a 200μm thick cast sheet, in which zirconium boride powder and silicon carbide powder are weighed at a volume percentage of 90%: 10% ;

[0036] 2. Impregnation: Weigh 2.5 grams of polyvinyl alcohol and add 150 grams of deionized water and stir evenly, then add 10 grams of graphite to form a slurry; then use the dipping method to immerse the casting sheet in the graphite slurry and immerse the casting sheet. Pull 3 times by dipping;

[0037] 3. Cut the cast sheet according to the size of the mold;

[0038] 4. Superimpose the sliced ​​cast sheet into the abrasive tool, vacuum degreasing, and during degreasing, the heating rate is 3°C...

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Abstract

The invention provides a process for preparing laminar zirconium boride superhigh-temperature ceramic by a casting-impregnation method, which is characterized by comprising the following steps: (1) preparing a zirconium boride casting sheet by a casting method: evenly stirring adhesive, plasticizer and solvent, adding zirconium boride ceramic powder to form a casting material, carrying out casting molding, drying at room temperature, and demolding to obtain the casting sheet which is 200-1000 mu m thick; (2) impregnating the casting sheet in graphite or boron nitride slurry by an impregnationmethod so as to impregnate the casting sheet; (3) slicing the casting sheet according to the size of a mold; (4) superposing the sliced casting sheets into the mold, and degreasing in vacuum; and (5)carrying out hot pressed sintering in an argon atmosphere to obtain the laminar zirconium boride superhigh-temperature ceramic of which the fracture toughness is up to 8.3 MPa.m<1 / 2>. The fracture mode of the laminar zirconium boride ceramic is non-brittle fracture, i.e. the laminar zirconium boride ceramic gradually fractures while having certain tolerance to cracking damage, and has favorable performance.

Description

Technical field [0001] The invention provides a method for preparing layered zirconium boride ultra-high temperature ceramics by a casting-dipping method, which belongs to the technical field of preparation of ultra-high temperature ceramics. Background technique [0002] Zirconium boride ceramics have excellent high temperature resistance and corrosion resistance and relatively low theoretical density, so they have been considered as one of the most promising materials in the ultra-high temperature ceramics (UHTCs) family. At present, zirconium boride ceramics have been widely used as various high-temperature structural and functional materials, such as turbine blades and magnetic fluid power generation electrodes in the aviation industry. But the fracture toughness of zirconium boride ceramics is low, and the toughness value is only 4~5MPa·m 1 / 2 , Limiting its application in harsh operating environments, such as supersonic aircraft nose cone and front, scramjet hot end componen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/58C04B35/622B32B18/00
Inventor 魏春城周立娟牛金叶董抒华
Owner SHANDONG UNIV OF TECH
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