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Preparation method of gradient zirconium boride ultrahigh-temperature ceramic

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 thermal insulation performance of ultra-high temperature ceramics of zirconium boride, achieve good interface bonding, reduce heat conduction, and reduce residual heat. effect of stress

Inactive Publication Date: 2013-04-10
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 preparation method of gradient zirconium boride ultra-high temperature ceramics in order to solve the problem of poor toughness and heat insulation performance of the existing zirconium boride ultra-high temperature ceramics

Method used

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  • Preparation method of gradient zirconium boride ultrahigh-temperature ceramic
  • Preparation method of gradient zirconium boride ultrahigh-temperature ceramic
  • Preparation method of gradient zirconium boride ultrahigh-temperature ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Prepare casting sheets of 20 different components: first weigh polyvinyl butyral, polyethylene glycol, and ethanol according to the table below, stir evenly, and then add 1 μm zirconium boride powder and 0.5 μm silicon carbide The powder and nano-zirconia powder are stirred evenly to form casting materials of each layer; then the casting materials of each layer are cast separately, dried at room temperature and demolded to obtain cast sheets of each layer;

[0019]

[0020] 2. Slice each layer of cast sheet according to the size of the mold;

[0021] 3. Then, from top to bottom, stack each layer of cast sheets in the graphite abrasive tool in turn, and then vacuum degrease. When degreasing, the heating rate is 2°C / min, the temperature is raised to 600°C, and the temperature is kept for 1h;

[0022] 4. Then hot-press sintering in an argon atmosphere, the sintering temperature is 1800°C, the heat preservation time is 0.5h, and the pressure is 20MPa, and the gradient...

Embodiment 2

[0024] 1. Prepare casting sheets of 15 different components: first weigh polyvinyl butyral, polyethylene glycol, and ethanol according to the table below, stir evenly, and then add 2 μm zirconium boride powder and 1 μm silicon carbide powder 1. Stir the nano-zirconia powder evenly to form the cast material of each layer; then cast the cast material of each layer separately, dry and demould at room temperature to obtain the cast sheet of each layer;

[0025]

[0026] 2. Slice each layer of cast sheet according to the size of the mold;

[0027] 3. Then, from top to bottom, stack each layer of cast sheets in turn and put them into the graphite abrasive tool, and then vacuum degrease. When degreasing, the heating rate is 2.5°C / min, the temperature is raised to 700°C, and the temperature is kept for 1h;

[0028] 4. Then hot-press sintering in an argon atmosphere, the sintering temperature is 1850°C, the heat preservation time is 1h, and the pressure is 30MPa, and the gradient zi...

Embodiment 3

[0030] 1. Prepare casting sheets of 17 different components: first weigh polyvinyl butyral, polyethylene glycol, and ethanol according to the following table, stir evenly, and then add 5 μm zirconium boride powder and 2 μm silicon carbide powder 1. Stir the nano-zirconia powder evenly to form the cast material of each layer; then cast the cast material of each layer separately, dry and demould at room temperature to obtain the cast sheet of each layer;

[0031]

[0032] 2. Slice each layer of cast sheet according to the size of the mold;

[0033] 3. Then, from top to bottom, stack each layer of cast sheets in turn and put them into the graphite abrasive tool, and then vacuum degrease. When degreasing, the heating rate is 3°C / min, the temperature is raised to 650°C, and the temperature is kept for 1h;

[0034] 4. Then hot-press sintering in an argon atmosphere, the sintering temperature is 1900°C, heat preservation for 1 hour, and the pressure is 40MPa, and the gradient zirc...

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Abstract

The invention provides a preparation method of gradient zirconium boride ultrahigh-temperature ceramic. The preparation method is characterized by comprising the following steps of: 1) preparing casting sheets with different components respectively by a casting method, namely adding a binder and a plasticizer into a solvent to stir uniformly, adding zirconium boride ceramic powder respectively tostir uniformly to form casting materials, and performing casting forming; 2) slicing; 3) overlapping the slices sequentially according to the component size of the zirconium boride, placing the slices into a graphite grinding apparatus, and then performing vacuum degreasing, wherein the layer number is more than 15; the mass percentage of the zirconium boride in the zirconium boride ceramic powder of each layer of casting slice is reduced sequentially; the mass percentage of silicon carbide is not changed or is reduced; the mass percentage of zirconium oxide is increased sequentially; and themass percentage sum of three components in the zirconium boride ceramic powder of each casting slice is 100 percent; and 4) performing hot pressed sintering to prepare the gradient zirconium boride ultrahigh-temperature ceramic with a heat insulation function. The preparation process is simple and the cost is low. By the preparation method, an ultrathin ceramic part can be prepared and has fracture toughness of up to 8 MPa.m1 / 2.

Description

technical field [0001] The invention provides a preparation method of gradient zirconium boride ultra-high temperature ceramics, 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 aircraft, hot-end parts of scramje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/577C04B35/622C04B35/66
Inventor 魏春城孟凡涛刘曙光冯柳
Owner SHANDONG UNIV OF TECH
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