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A ysz fiber reinforced γ-y 2 si 2 o 7 Preparation method of porous insulating ceramics

A fiber-reinforced, -y2si2o7 technology, applied in the field of YSZ fiber-reinforced γ-Y2Si2O7 porous heat-insulating ceramics, can solve problems such as deformation, low strength, and body shrinkage, and achieve simple process flow, high-strength thermal conductivity, and convenient operation Effect

Active Publication Date: 2021-07-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently preparing γ-Y 2 Si 2 o 7 The methods of porous ceramics include organic foam impregnation method and in-situ gel-injection molding method, but the porosity of the prepared samples is less than 90%, and it is generally difficult for these two preparation methods to obtain higher porosity (>90% ) of porous ceramics
This is because in order to obtain samples with high porosity, the gel-injection method requires the use of slurry with low solid content, and a large amount of water will cause serious shrinkage and deformation of the green body, so it is difficult to obtain materials with extremely high porosity
In addition, under the same porosity, the strength of the samples prepared by the organic foam method is obviously lower

Method used

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  • A ysz fiber reinforced γ-y <sub>2</sub> si <sub>2</sub> o <sub>7</sub> Preparation method of porous insulating ceramics
  • A ysz fiber reinforced γ-y <sub>2</sub> si <sub>2</sub> o <sub>7</sub> Preparation method of porous insulating ceramics
  • A ysz fiber reinforced γ-y <sub>2</sub> si <sub>2</sub> o <sub>7</sub> Preparation method of porous insulating ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this example, first weigh 65g of deionized water, then add 0.5g of citric acid, 3g of YSZ fiber and Y 2 o 3 : SiO 2 Mix 40g of mixed powder with a molar ratio of 1:2, mix and stir for 2 hours to form a uniformly dispersed slurry; then place the above slurry in a water bath at 35°C, add 1g of ammonium lauryl sulfate, and stir rapidly (mixer The rotation speed is 1300rpm) to foam for 30 minutes, then add 5g of gelatin and 1g of polyethylene glycol, stir for 20 minutes and then inject into the mold;

[0028] The green body and the mold after injection molding were placed in a freezer at -25°C for 20 hours of low-temperature freezing, then dried in a vacuum environment for 15 hours, and then the green body was demoulded, and then dried in an oven at 70°C for 20 hours; Finally, high-temperature reaction sintering was carried out at 1500°C in air for 3 hours to prepare YSZ fiber-reinforced γ-Y with extremely high porosity, high strength and low thermal conductivity. 2 S...

Embodiment 2

[0031] In this example, first weigh 70 g of deionized water, and then add 1 g of polyammonium methacrylate, 11 g of YSZ fiber and Y 2 o 3 : SiO 2 Mix 50g of mixed powder with a molar ratio of 1:2, mix and stir for 4 hours to form a uniformly dispersed slurry; then place the above slurry in a water bath at 45°C, add 3.5g of sodium lauryl sulfate, and stir rapidly ( The speed of the mixer is 1600rpm) to foam for 20 minutes, then add 6g of gelatin and 2g of glycerol, stir for 30 minutes and then inject into the mold;

[0032] Put the green body and the mold after injection molding into a freezer at -35°C for 15 hours of low-temperature freezing, then dry in a vacuum environment for 25 hours, and then remove the green body from the mold, and then dry it in an oven at 80°C for 15 hours; Finally, high-temperature reaction sintering was carried out at 1600°C in air for 1 hour to prepare YSZ fiber-reinforced γ-Y with extremely high porosity, high strength and low thermal conductivit...

Embodiment 3

[0035] In this example, first weigh 85g of deionized water, then add 1.5g of ammonium citrate, 6g of YSZ fiber and Y 2 o 3 : SiO 2 Mix 60g of mixed powder with a molar ratio of 1:2, mix and stir for 3 hours to form a uniformly dispersed slurry; then place the above slurry in a water bath at 50°C, add 5g of ammonium lauryl sulfate, and stir rapidly (mixer Rotating speed is 2000rpm) foaming for 15 minutes, then adding 7g of gelatin and 3g of glycerol, stirring for 40 minutes and injection molding;

[0036] Put the green body and mold after injection molding into a freezer at -45°C for 10 hours of low-temperature freezing, then dry in a vacuum environment for 30 hours, and then remove the green body from the mold, and then dry it in an oven at 90°C for 10 hours; Finally, high-temperature reaction sintering was carried out at 1550°C in air for 2 hours to prepare YSZ fiber-reinforced γ-Y with extremely high porosity, high strength and low thermal conductivity. 2 Si 2 o 7 Porou...

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Abstract

The invention relates to the field of high-temperature heat insulation materials, specifically a YSZ fiber-reinforced γ-Y with extremely high porosity and high strength 2 Si 2 o 7 The preparation method of porous heat-insulating ceramics. Use yttrium oxide, silicon oxide powder and YSZ fiber as raw materials, choose polyammonium methacrylate, citric acid or ammonium citrate as dispersant, first stir the slurry for 2 to 4 hours to disperse the powder and YSZ fiber evenly, and then mix the above slurry Raise the temperature of the material to 35-50°C, add foaming agent ammonium lauryl sulfate or sodium lauryl sulfate, gelatin gelatin and surfactant glycerol or polyethylene glycol under rapid stirring, and then injection mold and Low-temperature freezing, followed by vacuum drying, after which the green body is demolded and oven-dried. Finally, high-temperature reaction sintering is carried out at 1500-1600°C to prepare YSZ fiber-reinforced γ‑Y 2 Si 2 o 7 porous ceramics. The invention can obtain a heat insulating material with extremely high porosity, high strength and low thermal conductivity, has simple preparation process, strong operability, low cost and broad prospect for industrial production.

Description

technical field [0001] The invention relates to the field of high-temperature heat insulation materials, specifically a YSZ fiber reinforced γ-Y with extremely high porosity, high strength and low thermal conductivity prepared by a novel foaming-casting-freeze-drying process 2 Si 2 o 7 A method for porous insulating ceramics. Background technique [0002] Insulation materials play a huge role in industries, construction, transportation and aerospace. γ-Y 2 Si 2 o 7 As an emerging thermal insulation material, porous ceramics have the advantages of light weight, high porosity, high strength and low thermal conductivity, such as: low density (0.42g / cm 3 ), high porosity (89.3%), high strength (3.4MPa), low thermal conductivity (0.15W / (m K)) and high temperature resistance (1550°C), see literature Z.Wu, et al. Ceram. Int. (International Journal of Ceramics). 2015(41):14230–14238. Currently preparing γ-Y 2 Si 2 o 7 The methods of porous ceramics include organic foam im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B35/80C04B35/505C04B35/624C04B35/622
CPCC04B35/803C04B35/505C04B35/622C04B35/624C04B38/02C04B2235/3418C04B2235/6567C04B2235/96C04B2235/9607C04B38/0074C04B38/0054
Inventor 王京阳吴贞孙鲁超潘晶晶
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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