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Preparation method of YSZ fiber reinforced gassm-Y2Si2O7 porous thermal-insulation ceramic

A -y2si2o7, fiber-reinforced technology, applied in the field of YSZ fiber-reinforced γ-Y2Si2O7 porous thermal insulation ceramics, can solve the problems of difficult to obtain materials, deformation, low strength, etc., to meet the national strategic requirements, simple process flow, easy to operate Effect

Active Publication Date: 2019-04-30
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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  • Preparation method of YSZ fiber reinforced gassm-Y2Si2O7 porous thermal-insulation ceramic
  • Preparation method of YSZ fiber reinforced gassm-Y2Si2O7 porous thermal-insulation ceramic
  • Preparation method of YSZ fiber reinforced gassm-Y2Si2O7 porous thermal-insulation ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this example, first weigh 65 g of deionized water, and add 0.5 g of citric acid, 3 g of YSZ fiber, and YSZ fiber under constant stirring. 2 O 3 : SiO 2 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 slurry in a 35°C water bath, add 1g of lauryl ammonium sulfate, and stir quickly (mixer (Rotation speed is 1300rpm) foaming for 30 minutes, then adding 5g of gelatin and 1g of polyethylene glycol, stirring for 20 minutes, and then injection molding;

[0028] Put the molded body and mold into a freezer at -25°C for low-temperature freezing for 20 hours, then dry for 15 hours in a vacuum environment, then demold the blank, and then dry it in an oven at 70°C for 20 hours; Finally, high-temperature reaction sintering is carried out at 1500℃ in air for 3 hours to prepare YSZ fiber-reinforced γ-Y with extremely high porosity, high strength and low thermal conductivity. 2 Si 2 O 7 Porous insulation ceramic...

Embodiment 2

[0031] In this example, first weigh 70 g of deionized water, and add 1 g of polyammonium methacrylate, 11 g of YSZ fiber, and YSZ fiber under constant stirring. 2 O 3 : SiO 2 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 quickly ( (The speed of the mixer is 1600rpm) foaming for 20 minutes, then adding 6g of gelatin and 2g of glycerol, stirring for 30 minutes, and then injection molding;

[0032] Put the molded body and mold into a freezer at -35°C for 15 hours of low-temperature freezing, and then dry for 25 hours in a vacuum environment, after which the blank is demolded, and then dried in an oven at 80°C for 15 hours; Finally, high-temperature reaction sintering is carried out at 1600℃ in air for 1 hour to prepare YSZ fiber-reinforced γ-Y with extremely high porosity, high strength and low thermal conductivity. 2 Si 2 O ...

Embodiment 3

[0035] In this example, first weigh 85 g of deionized water, and add 1.5 g of ammonium citrate, 6 g of YSZ fiber, and YSZ fiber under constant stirring. 2 O 3 : SiO 2 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 slurry in a water bath at 50°C, add 5g of ammonium lauryl sulfate, and stir quickly (mixer (Rotation speed is 2000rpm) foaming for 15 minutes, then adding 7g of gelatin and 3g of glycerol, stirring for 40 minutes, and then injection molding;

[0036] Put the molded body and mold into a freezer at -45°C for 10 hours of low-temperature freezing, then dry for 30 hours in a vacuum environment, then demold the blank, and then dry it in an oven at 90°C for 10 hours; Finally, high-temperature reaction sintering is carried out at 1550℃ 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 Porous insulation ceramics.

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Abstract

The invention relates to the field of high-temperature heat insulating materials, particularly to a preparation method of an YSZ fiber reinforced gassm-Y2Si2O7 porous thermal-insulation ceramic with extremely high porosity and high strength. The preparation method comprises: using yttrium oxide powder, silicon oxide powder and YSZ fiber as raw materials, selecting ammonium polymethacrylate, citricacid or ammonium citrate as a dispersing agent, stirring a slurry for 2-4 h to uniformly disperse the powder and the YSZ fiber, heating the slurry to a temperature of 35-50 DEG C, adding a foaming agent ammonium lauryl sulfate or sodium lauryl sulfate, a gelling agent gelatin and a surfactant glycerin or polyethylene glycol under rapid stirring, injecting into a mold, carrying out low-temperaturefreezing, carrying out vacuum drying, demolding to obtain a billet, drying in an oven, and carrying out high-temperature reaction sintering at a temperature of 1500-1600 DEG C to prepare the YSZ fiber reinforced gassm-Y2Si2O7 porous thermal-insulation ceramic. According to the present invention, with the method, the thermal insulation material with extremely high porosity, high strength and low thermal conductivity can be obtained; and the method has advantages of simple preparation process, strong operability, low cost and broad industrial production prospect.

Description

Technical field [0001] The invention relates to the field of high-temperature insulation materials, in particular to a YSZ fiber-reinforced γ-Y with extremely high porosity, high strength and low thermal conductivity prepared by a novel foaming-injection-freeze drying process 2 Si 2 O 7 Porous insulation ceramic method. Background technique [0002] Insulation materials play a huge role in industries, construction, transportation, aerospace and other fields. 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 good high temperature resistance (1550°C), see literature Z.Wu, et al. Ceram.Int. (Journal of the International Ceramic Society).2015(41):14230-14238. Currently preparing γ-Y 2 Si 2 O 7 The methods of porous ceramics include organic f...

Claims

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Application Information

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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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