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Method for preparing lamellar zirconium boride ultrahigh-temperature ceramic through casting method

A technology of ultra-high temperature ceramics and zirconium boride, which is applied in chemical instruments and methods, ceramic layered products, layered products, etc., and can solve the problems of poor toughness of zirconium boride ultra-high temperature ceramics

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 the existing zirconium boride ultra-high temperature ceramics, and to provide a method for preparing layered zirconium boride ultra-high temperature ceramics by tape casting

Method used

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  • Method for preparing lamellar zirconium boride ultrahigh-temperature ceramic through casting method
  • Method for preparing lamellar zirconium boride ultrahigh-temperature ceramic through casting method
  • Method for preparing lamellar zirconium boride ultrahigh-temperature ceramic through casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Prepare zirconium boride casting sheets A and B of two different components and thicknesses: (1) Prepare the casting material for zirconium boride casting sheet A, first weigh 5.80 grams of polyvinyl butyral , 5.80 grams of polyethylene glycol, 58.01 grams of ethanol, stir evenly, then add 54.81 grams of zirconium boride powder and 3.20 grams of silicon carbide powder, stir evenly to form zirconium boride casting material A, wherein zirconium boride powder and silicon carbide Powder is to take according to the volume percentage of 90%: 10%; (2) prepare the preparation of the casting material of zirconium boride casting sheet B, first weigh 5.23 grams of polyvinyl butyral, 5.23 grams of polyethylene glycol , 104.46 gram of ethanol, stir evenly, then add 42.63 gram of zirconium boride powder and 9.60 gram of silicon carbide powder, stir, form zirconium boride casting material B, wherein zirconium boride powder and silicon carbide powder are according to 70%: 30 % by vo...

Embodiment 2

[0026] 1. Prepare zirconium boride casting sheets A and B of two different components and thicknesses: (1) Prepare the casting material for zirconium boride casting sheet A, first weigh 4.53 grams of polyvinyl butyral , 4.53 grams of polyethylene glycol, 84.86 grams of ethanol, stir evenly, then add 51.77 grams of zirconium boride powder and 4.80 grams of silicon carbide powder, stir evenly to form zirconium boride casting material A, wherein zirconium boride powder and silicon carbide Powder is to take according to the volume percentage of 85%: 15%; (2) prepare the preparation of casting material of zirconium boride casting sheet B, first weigh 7.62 grams of polyvinyl butyral, 7.62 grams of polyethylene glycol , 152.37 gram of ethanol, stir evenly, then add 39.59 gram of zirconium boride powder and 11.20 gram of silicon carbide powder, stir evenly, form zirconium boride casting material B, wherein zirconium boride powder and silicon carbide powder are according to 65%: 35 % b...

Embodiment 3

[0031] 1. Prepare zirconium boride casting sheets A and B of two different components and thicknesses: (1) Prepare the casting material for zirconium boride casting sheet A, first weigh 2.76 grams of polyvinyl butyral , 2.76 grams of polyvinyl alcohol, 110.24 grams of ethanol, stir evenly, then add 48.72 grams of zirconium boride powder and 6.4 grams of silicon carbide powder, stir evenly to form zirconium boride casting material A, wherein zirconium boride powder and silicon carbide powder It is taken according to the volume percentage of 80%: 20%; (2) preparation of the casting material of zirconium boride casting sheet B, first weigh 9.29 grams of polyvinyl butyral, 9.29 grams of polyvinyl alcohol, 232.25 gram of ethanol, stir well, then add 30.45 gram of zirconium boride powder and 16 gram of silicon carbide powder, stir, form zirconium boride casting material B, wherein zirconium boride powder and silicon carbide powder are according to 50%: 50% Weighing by volume percent...

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Abstract

The invention provides a method for preparing lamellar zirconium boride ultrahigh-temperature ceramic through a casting method. The method is characterized by comprising the following steps of: (1) respectively preparing two zirconium boride casting sheets with different components and thicknesses by adopting the casting method: firstly adding a binder and a plasticizer to a solvent, uniformly stirring, then respectively adding zirconium boride ceramic powder, uniformly stirring to form two casting materials with different components, then carrying out casting forming, and drying and demoulding at room temperature to respectively obtain a zirconium boride casting sheet A with the thickness of 300-1000 micrometers and a zirconium boride casting sheet with the thickness of 20-100 micrometers; (2) respectively slicing the zirconium boride casting sheet A and the zirconium boride casting sheet B according to the size of a mould; (3) alternately overlapping the sliced zirconium boride casting sheet A and the sliced zirconium boride casting sheet B, placing into a graphite grinding tool, and degreasing in vacuum; and (4) carrying out hot pressed sintering in an argon atmosphere at the sintering temperature of 1900-2000 DEG C under the pressure of 20-40 MPa so as to obtain the lamellar zirconium boride ultrahigh-temperature ceramic. A casting forming technology is adopted in the invention and the method has simple process; and in addition, an obtained material reaches high toughness value at 9.3 MPa.m<1 / 2>.

Description

technical field [0001] The invention provides a method for preparing layered zirconium boride ultra-high temperature ceramics by casting method, which belongs to the technical field of ultra-high temperature ceramics preparation. Background technique [0002] Zirconium boride ceramics have superior high temperature and corrosion resistance properties and relatively low theoretical density, so they have been considered as one of the most promising materials in the family of ultra-high temperature ceramics (UHTCs). 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 aircraft, hot...

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 魏春城田贵山冯柳周立娟
Owner SHANDONG UNIV OF TECH
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