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Preparation method of zirconium boride-silicon carbide/boron nitride lamellar ultrahigh-temperature ceramic

An ultra-high temperature ceramic and boron nitride layer technology, which is applied in chemical instruments and methods, ceramic layered products, layered products, etc. The effect of improved oxidation resistance and high high temperature oxidation resistance

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 provide a method for preparing zirconium boride-silicon carbide / boron nitride layered ultra-high temperature ceramics in order to solve the problem of poor toughness of existing zirconium boride ultra-high temperature ceramics

Method used

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  • Preparation method of zirconium boride-silicon carbide/boron nitride lamellar ultrahigh-temperature ceramic
  • Preparation method of zirconium boride-silicon carbide/boron nitride lamellar ultrahigh-temperature ceramic
  • Preparation method of zirconium boride-silicon carbide/boron nitride lamellar ultrahigh-temperature ceramic

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Experimental program
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Embodiment 1

[0023] 1. Preparation of zirconium boride casting sheet and boron nitride casting sheet: (1) Preparation of zirconium boride casting material, first weigh 2.61g polyvinyl butyral, 2.61g polyethylene glycol, 52.23g Ethanol, stir evenly, then add 42.63 grams of 1μm zirconium boride powder and 9.60 grams of 0.5μm silicon carbide powder, stir evenly to form a zirconium boride cast material, where zirconium boride powder and silicon carbide powder are 70%: Weigh 30% by volume; (2) Preparation of boron nitride casting material, first weigh 3.03 g polyvinyl butyral, 3.03 g polyethylene glycol, 151.7 ethanol, stir evenly, and then add 18.16 g nitrogen Boron powder and 12.18 grams of zirconium boride powder are stirred evenly to form a boron nitride cast material, wherein the boron nitride powder and zirconium boride powder are weighed according to the volume percentage of 80%:20%; (3) Casting Forming, casting zirconium boride casting material and boron nitride casting material respecti...

Embodiment 2

[0028] 1. Preparation of zirconium boride casting sheet and boron nitride casting sheet: (1) Preparation of zirconium boride casting material, first weigh 5.51 grams of polyvinyl butyral, 5.51 grams of polyethylene glycol, and 82.68 grams Ethanol, stir evenly, then add 48.72 grams of 2μm zirconium boride powder and 6.40 grams of 1μm silicon carbide powder, stir evenly to form a zirconium boride cast material, where the zirconium boride powder and silicon carbide powder are in accordance with 80%:20 % By volume; (2) The preparation of boron nitride cast material, first weigh 3.98 grams of polyvinyl butyral, 3.98 grams of polyethylene glycol, and 185.64 grams of ethanol, stir evenly, and then add 20.43 grams of nitrogen Boron powder and 6.09 grams of zirconium boride powder are stirred evenly to form a boron nitride cast material, where the boron nitride powder and zirconium boride powder are weighed at a volume percentage of 90%: 10%; (3) Casting Forming, casting the zirconium b...

Embodiment 3

[0033] 1. Preparation of zirconium boride casting sheet and boron nitride casting sheet: (1) Preparation of zirconium boride casting material, first weigh 8.70g polyvinyl butyral, 8.70g polyethylene glycol, 116.02g Ethanol, stir evenly, then add 54.81 grams of 5μm zirconium boride powder and 3.20 grams of 2μm silicon carbide powder, stir evenly to form a zirconium boride cast material, in which zirconium boride powder and silicon carbide powder are 90%:10 % By volume; (2) The preparation of boron nitride cast material, first weigh 4.54 grams of polyvinyl butyral, 4.54 grams of polyethylene glycol, 227 grams of ethanol, stir evenly, and then add 22.7 grams of nitrogen Boron powder, stir evenly to form boron nitride cast material; (3) Casting, respectively cast zirconium boride cast material and boron nitride cast material, dry and demold at room temperature to obtain 200μm thick boron Zirconium oxide cast film and 20μm thick boron nitride cast film;

[0034] 2. The zirconium bori...

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Abstract

The invention provides a preparation method of zirconium boride-silicon carbide / boron nitride lamellar ultrahigh-temperature ceramic. The preparation method of the zirconium boride-silicon carbide / boron nitride lamellar ultrahigh-temperature ceramic is characterized by comprising the following steps of: (1) respectively preparing a zirconium boride casting sheet and a boron nitride casting sheet by adopting a casting method: firstly adding a binder and a plasticizer to a solvent, uniformly stirring, then respectively adding zirconium boride ceramic powder and boron nitride boride ceramic powder, uniformly stirring to form casting materials, then carrying out casting forming, and drying and demoulding at room temperature to respectively obtain the zirconium boride casting sheet with the thickness of 200-1000 micrometers and the boron nitride casting sheet with the thickness of 20-100 micrometers; (2) respectively slicing the zirconium boride casting sheet and the boron nitride casting sheet according to the size of a mould; (3) alternately overlapping the zirconium boride slices and the boron nitride slices, placing into a graphite grinding tool, and degreasing in vacuum; and (4) carrying out hot pressed sintering in an argon atmosphere to prepare the lamellar ultrahigh-temperature ceramic. The invention has simple preparation process, low cost and controllable component; and in addition, an obtained material has higher high-temperature oxidation resistance and reaches high fracture toughness at 18.1 MPa.m<1 / 2>.

Description

Technical field [0001] The invention provides a preparation method of zirconium boride-silicon carbide / boron nitride layered ultra-high temperature ceramics, which belongs to the technical field of preparation of functional 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 components, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66B32B18/00C04B35/58C04B35/583C04B35/622
Inventor 魏春城董抒华周立娟田贵山
Owner SHANDONG UNIV OF TECH
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