Preparation method of layered zirconium boride superhigh temperature ceramic with heat insulation function

A technology of ultra-high-temperature ceramics and zirconium boride, which is applied in the field of preparation of ultra-high-temperature ceramics, can solve the problems of poor toughness and heat insulation performance of zirconium boride ultra-high-temperature ceramics, and achieve the goal of improving ceramic toughness, increasing expansion paths, and reducing heat conduction Effect

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

[0004] The purpose of the present invention is to solve the problem of poor toughness and heat insulation performance of existing zirconium boride ultrahigh temperature ceramics, and to provide a method for preparing layered zirconium boride ultrahigh temperature ceramics with heat insulation function. The technical scheme is as follows:

Method used

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  • Preparation method of layered zirconium boride superhigh temperature ceramic with heat insulation function
  • Preparation method of layered zirconium boride superhigh temperature ceramic with heat insulation function
  • Preparation method of layered zirconium boride superhigh temperature ceramic with heat insulation function

Examples

Experimental program
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Effect test

Embodiment 1

[0024] 1. Preparation of zirconium boride casting sheet: first weigh 2.61 grams of polyvinyl butyral, 2.61 grams of polyethylene glycol, and 52.23 grams of ethanol, stir to mix evenly, then add 42.63 grams of 1 μm zirconium boride powder, 9.60 grams of 0.5 μm silicon carbide powder are stirred evenly to form a cast material, cast, dried at room temperature and demoulded to obtain a 1000 μm thick cast sheet, wherein the zirconium boride powder and silicon carbide powder are according to the volume percentage of 70%: 30% Weigh;

[0025] 2. Coating: First weigh 2 grams of polyethylene glycol and add 100 grams of deionized water to stir evenly, then add 10 grams of zirconia to form a slurry; then use the coating method to coat the zirconia slurry on the casting sheet Surface, coated once;

[0026] 3. Slice the cast film according to the size of the mold;

[0027] 4. Put the sliced ​​casting sheets into the mold, and vacuum degrease. When degreasing, the heating rate is 2°C / min, ...

Embodiment 2

[0030] 1. Preparation of zirconium boride casting sheet: first weigh 5.51 grams of polyvinyl butyral, 5.51 grams of polyethylene glycol, and 82.68 grams of ethanol, stir to mix evenly, then add 48.72 grams of 2 μm zirconium boride powder, 6.40 grams of 1 μm silicon carbide powder are stirred evenly to form a casting material, cast, and after room temperature drying and demoulding, a 700 μm thick casting sheet is obtained, wherein the zirconium boride powder and the silicon carbide powder are weighed according to the volume percentage of 80%: 20%. Pick;

[0031] 2. Coating: First weigh 3 grams of polyvinyl alcohol and add 150 grams of deionized water to stir evenly, then add 10 grams of zirconia to form a slurry; then use the coating method to coat the zirconia slurry on the upper surface of the casting sheet , coated 2 times;

[0032] 3. Slice the cast film according to the size of the mold;

[0033] 4. Put the sliced ​​casting sheets into the mold, and vacuum degrease. When...

Embodiment 3

[0036] 1. Preparation of zirconium boride casting sheet: first weigh 4.06 grams of polyvinyl butyral, 4.06 grams of polyvinyl alcohol, and 116.02 grams of ethanol, and mix them evenly by stirring, then add 54.81 grams of 5 μm zirconium boride powder, 3.20 Gram of 2 μm silicon carbide powder, stirred evenly to form a cast material, cast, dried at room temperature and demoulded to obtain a 200 μm thick cast sheet, wherein the zirconium boride powder and silicon carbide powder were weighed according to the volume percentage of 90%: 10% ;

[0037] 2. Coating: First weigh 2.5 grams of polyvinyl alcohol and add 200 grams of deionized water to stir evenly, then add 10 grams of zirconia to form a slurry; then use the coating method to coat the zirconia slurry on the upper surface of the casting sheet , coated 3 times;

[0038] 3. Slice the cast film according to the size of the mold;

[0039] 4. Put the sliced ​​casting sheets into the mold, and vacuum degrease. When degreasing, the...

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Abstract

The invention provides a preparation method of layered zirconium boride superhigh temperature ceramic with a heat insulation function. The preparation method is characterized by comprising the following steps: 1) preparing a casting sheet, namely, evenly mixing a binder, a plasticizer and a solvent, adding zirconium boride ceramic powder material to form a casting material, then carrying out casting forming, and drying at room temperature and demoulding to obtain a casting sheet with the thickness of 200-1000 mu m; 2) coating zirconium oxide slurry on the surface of the casting sheet by usinga coating method, and controlling the thickness of the coating through coating times; 3) slicing the casting sheet according to the size of a mould; 4) putting the sliced casting sheets in the mould in an overlapping way for vacuum derosination; and 5) carrying out hot pressed sintering in an argon atmosphere so as to obtain the layered zirconium boride superhigh temperature ceramic with heat insulation function, wherein the fracture toughness of the ceramic is up to 9.1MPa.m<1 / 2>, and the heat conduction of the ceramic vertical to a layer direction is 8w / m.k at room temperature. The fracturemode of the layered zirconium boride ceramic is non-brittle fracture which refers to a gradual fracture having a certain tolerance capability to flaw damage. The layered zirconium boride superhigh temperature ceramic has the advantages of heat insulation function and excellent property.

Description

technical field [0001] The invention provides a method for preparing layered zirconium boride ultra-high temperature ceramics with heat insulation function, belonging to the technical field of ultra-high temperature ceramics preparation. Background technique [0002] Zirconium boride 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. At present, zirconium boride ceramics have been widely used as various high-temperature structural and functional materials, such as: turbine blades in the aviation industry, magnetic fluid power generation electrodes, etc. However, the fracture toughness of zirconium boride ceramics is low, and the toughness value is only 4-5 MPa m 1 / 2 , which limits its application in harsh operating environments, such as the nose cone and leading edge of supersonic aircra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/66C04B35/622
Inventor 魏春城冯柳董抒华孟凡涛
Owner SHANDONG UNIV OF TECH
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