Preparation method of zirconium boride-silicon carbide/graphite layered superhigh temperature ceramic

A technology of ultra-high temperature ceramics and zirconium boride, 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, and is beneficial to wire cutting processing, Strong machinability, increase the effect of expansion path

Inactive Publication Date: 2011-09-07
SHANDONG UNIV OF TECH
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  • Summary
  • 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 / graphite 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/graphite layered superhigh temperature ceramic
  • Preparation method of zirconium boride-silicon carbide/graphite layered superhigh temperature ceramic
  • Preparation method of zirconium boride-silicon carbide/graphite layered superhigh temperature ceramic

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Embodiment 1

[0025] 1. Preparation of zirconium boride casting sheet and graphite 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 of ethanol, Stir evenly, then add 42.63 grams of 1 μm zirconium boride powder and 9.60 grams of 0.5 μm silicon carbide powder, stir evenly to form a zirconium boride casting material, wherein the zirconium boride powder and silicon carbide powder are according to 70%: 30% (2) Preparation of graphite cast material, first weigh 3.06 grams of polyvinyl butyral, 3.06 grams of polyethylene glycol, 152.9 ethanol, stir evenly, then add 18.40 grams of graphite powder and 12.18 grams of Zirconium boride powder, stir evenly, form graphite casting material, wherein graphite powder and zirconium boride powder are to take by volume percentage according to 80%: 20%; Casting with graphite casting material, drying at room temperature and demoulding to obtain 1000 μm ...

Embodiment 2

[0030] 1. Preparation of zirconium boride casting sheet and graphite casting sheet: (1) preparation of zirconium boride casting material, first weighing 5.51 grams of polyvinyl butyral, 5.51 grams of polyethylene glycol, and 82.68 grams of ethanol, Stir evenly, then add 48.72 grams of 2 μm zirconium boride powder and 6.40 grams of 1 μm silicon carbide powder, stir evenly to form a zirconium boride casting material, wherein the zirconium boride powder and silicon carbide powder are according to 80%: 20% Volume percentage is weighed; (2) preparation of graphite cast material, first weigh 4.02 grams of polyvinyl butyral, 4.02 grams of polyethylene glycol, 187.53 grams of ethanol, stir well, then add 20.70 grams of graphite powder and 6.09 grams Zirconium boride powder is stirred evenly to form graphite cast material, wherein graphite powder and zirconium boride powder are weighed according to the volume percentage of 90%: 10%; (3) casting molding, respectively making zirconium bor...

Embodiment 3

[0035] 1. Preparation of zirconium boride casting sheet and graphite casting sheet: (1) preparation of zirconium boride casting material, first weigh 8.70 grams of polyvinyl butyral, 8.70 grams of polyvinyl alcohol, 116.02 grams of ethanol, stir Evenly, add 54.81 grams of zirconium boride powder of 5 μm and 3.20 grams of silicon carbide powder of 2 μm, stir evenly, and form zirconium boride cast material, wherein zirconium boride powder and silicon carbide powder are according to the volume of 90%: 10% Percent weighing; (2) preparation of graphite casting material, first weigh 4.6 grams of polyvinyl butyral, 4.6 grams of polyvinyl alcohol, 230 grams of ethanol, stir evenly, then add 23 grams of graphite powder, stir evenly, and form Graphite casting material; (3) casting molding, casting zirconium boride casting material and graphite casting material respectively, drying and demoulding at room temperature to obtain 200 μm thick zirconium boride casting sheet and 20 μm thick gra...

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Abstract

The invention provides a preparation method of zirconium boride-silicon carbide / graphite layered superhigh temperature ceramic. The preparation method is characterized by comprising the following steps: 1) separately preparing a zirconium boride casting sheet and a zirconium oxide casting sheet by using a casting method, namely, adding a binder and a plasticizer in a solvent and evenly mixing, separately adding a zirconium boride ceramic powder material and a graphite ceramic powder material, and evenly mixing to form a casting material, then carrying out casting forming, and drying at room temperature and demoulding to respectively obtain the zirconium boride casting sheet with the thickness of 200-1000 mu m and the graphite casting sheet with the thickness of 20-100 mu m; 2) respectively slicing the zirconium boride casting sheet and the graphite casting sheet according to the size of a mould; 3) putting the zirconium boride sheet and the graphite sheet in a graphite mould in an alternatively overlapping way for vacuum derosination; and 4) hot pressed sintering in an argon atmosphere to prepare the layered superhigh temperature ceramic. According to the invention, preparation process is simple, cost is low, the machinability of the material is strong, compositions are controllable, and the toughness of the material is up to 11.3MPa.m<1 / 2>.

Description

technical field [0001] The invention provides a preparation method of zirconium boride-silicon carbide / graphite layered ultra-high temperature ceramics, which belongs to the technical field of preparation of porous 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, hot-end p...

Claims

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Application Information

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IPC IPC(8): C04B35/66B32B18/00C04B35/58C04B35/52C04B35/622
Inventor 魏春城牛金叶刘曙光冯柳
Owner SHANDONG UNIV OF TECH
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