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

A technology of ultra-high-temperature ceramics and boron nitride layers, which is 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, etc. Oxidation improvement, high temperature and oxidation resistance effect

Inactive Publication Date: 2013-03-13
SHANDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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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 2.61 grams of polyvinyl butyral, 2.61 grams of polyethylene glycol, 52.23 grams Ethanol, stir evenly, then add 42.63 grams of zirconium boride powder of 1 μm and 9.60 grams of silicon carbide powder of 0.5 μm, stir uniformly, form zirconium boride casting material, wherein zirconium boride powder and silicon carbide powder are according to 70%: 30% volume percentage is weighed; (2) the preparation of boron nitride casting material, first weigh 3.03 grams of polyvinyl butyral, 3.03 grams of polyethylene glycol, 151.7 ethanol, stir evenly, then add 18.16 grams of nitrogen Boron nitride powder and 12.18 grams of zirconium boride powder are stirred evenly to form boron nitride cast material, wherein boron nitride powder and zirconium boride powder are taken according to the volume percentage of 80%: 20%; (3) casting Forming, cas...

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, 82.68 grams Ethanol, stir evenly, then add 48.72 grams of zirconium boride powder of 2 μm and 6.40 grams of silicon carbide powder of 1 μm, stir evenly, form zirconium boride casting material, wherein zirconium boride powder and silicon carbide powder are according to 80%: 20 The volume percentage of % is weighed; (2) the preparation of boron nitride casting material, first weigh 3.98 grams of polyvinyl butyral, 3.98 grams of polyethylene glycol, 185.64 grams of ethanol, stir well, then add 20.43 grams of nitrogen Boron nitride powder and 6.09 grams of zirconium boride powder are stirred evenly to form boron nitride cast material, wherein boron nitride powder and zirconium boride powder are taken according to the volume percentage of 90%: 10%; (3) cast Moldi...

Embodiment 3

[0033] 1. Preparation of zirconium boride casting sheet and boron nitride casting sheet: (1) Preparation of zirconium boride casting material, first weigh 8.70 grams of polyvinyl butyral, 8.70 grams of polyethylene glycol, 116.02 grams Ethanol, stir evenly, then add 54.81 grams of zirconium boride powder of 5 μm and 3.20 grams of silicon carbide powder of 2 μm, stir evenly, form zirconium boride casting material, wherein zirconium boride powder and silicon carbide powder are according to 90%: 10 The volume percentage of % is weighed; (2) the preparation of boron nitride casting material, first weigh 4.54 grams of polyvinyl butyral, 4.54 grams of polyethylene glycol, 227 grams of ethanol, stir well, then add 22.7 grams of nitrogen The boron powder is stirred evenly to form a boron nitride casting material; (3) tape casting, respectively casting the zirconium boride casting material and the boron nitride casting material, drying at room temperature and demoulding to obtain a boro...

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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 method for preparing 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 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 aircraft, h...

Claims

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Application Information

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Patent Type & Authority Patents(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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