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A Green Preparation Method of Lightweight and Low Thermal Conductivity γ-Y2Si2O7 Porous Ceramics

A technology of porous ceramics and low thermal conductivity, which is applied in the field of γ-Y2Si2O7 porous ceramic materials, can solve the problems of toxicity, unfavorable green industrial production, and few researches on porous ceramics, and achieves simple preparation methods, easy large-scale production, and wide variety of raw materials little effect

Active Publication Date: 2016-01-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, corresponding other raw materials (such as: crosslinking agent N,N'-methylenebisacrylamide, catalyst N,N,N',N'-tetramethylethylenediamine and initiator ammonium persulfate, etc.) For poisonous or irritating substances, it is not conducive to green industrial production (M.A.Janney, etal.J.Am.Ceram.Soc. (Journal of American Ceramic Society). (1998) 81 [3]: 581-591.)
[0004] In addition, researchers are currently focusing on the γ-Y 2 Si 2 o 7 Preparation and performance of ceramic bulk materials and coatings, and γ-Y 2 Si 2 o 7 There are few studies on porous ceramics

Method used

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  • A Green Preparation Method of Lightweight and Low Thermal Conductivity γ-Y2Si2O7 Porous Ceramics
  • A Green Preparation Method of Lightweight and Low Thermal Conductivity γ-Y2Si2O7 Porous Ceramics
  • A Green Preparation Method of Lightweight and Low Thermal Conductivity γ-Y2Si2O7 Porous Ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0026] First weigh 50g of deionized water, add 1g of citric acid and Y 2 o 3 : SiO 2 100g of mixed powder with a molar ratio of 1:2, mixed, Y 2 o 3 and SiO 2 The particle size of the mixed powder is 1-2 μm, and then stirred for 3 hours to form a slurry;

[0027] Then the slurry is placed in a water bath at 45° C., 1.5 g of sodium lauryl sulfate is added, stirred rapidly (the speed of the mixer is 1700 rpm) and foamed for 20 minutes, then 3.5 g of gelatin and 3 g of glycerol are added, and stirred for 5 minutes Post-injection molding, forming a green body after demoulding;

[0028] Dry the green body at room temperature for 20 hours, then dry it in an oven at 75°C for 25 hours, and finally perform high-temperature reaction sintering at 1525°C in the air. The heating rate of high-temperature reaction sintering is 5°C / min, and the holding time is 1.5 hours. Burn off organic compounds and synthesize γ-Y with light weight, high porosity and low thermal conductivity through gr...

Embodiment 2

[0030] First weigh 40g of deionized water, then add 0.5g of ammonium citrate and Y 2 o 3 : SiO 2 80g of mixed powder with a molar ratio of 1:2, mixed, Y 2 o 3 and SiO 2 The particle size of the mixed powder is 2 to 3 μm, and then stirred for 1.5 hours to form a slurry;

[0031] Then slurry is placed in the water bath of 40 ℃, adds sodium lauryl sulfate 0.6g, stirs rapidly (mixer rotating speed is 1500rpm) and foams for 10 minutes, then adds gelatin 2.5g and polyethylene glycol 2g, stirs for 10 minutes Minutes later injection molding, forming green body after demoulding;

[0032] Dry the green body at room temperature for 30 hours, then dry it in an oven at 65°C for 30 hours, and finally perform high-temperature reaction sintering at 1500°C in the air. The heating rate of high-temperature reaction sintering is 7°C / min, and the holding time is 2 hours. Burn out organic compounds, and prepare γ-Y with light weight, high porosity and low thermal conductivity through green pr...

Embodiment 3

[0034] First weigh 60g of deionized water, then add 1.5g of ammonium citrate and Y 2 o 3 : SiO 2 120g of mixed powder with a molar ratio of 1:2, mixed, Y 2 o 3 and SiO 2 The particle size of the mixed powder is 0.5-1.5 μm, and then stirred for 2 hours to form a slurry;

[0035] Then the slurry is placed in a water bath at 48° C., 2 g of sodium dodecylsulfonate is added, stirred rapidly (the speed of the mixer is 2000 rpm) and foamed for 25 minutes, then 4 g of gelatin and 5 g of polyethylene glycol are added, and stirred for 15 minutes Post-injection molding, forming a green body after demoulding;

[0036] Dry the green body at room temperature for 25 hours, then dry it in an oven at 85°C for 20 hours, and finally perform high-temperature reaction sintering at 1550°C in the air. The heating rate of high-temperature reaction sintering is 2°C / min, and the holding time is 1 hour. Burn out organic compounds, and prepare γ-Y with light weight, high porosity and low thermal co...

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Abstract

The invention relates to the field of porous ceramic heat-insulating materials, particularly a method for preparing light-weight low-thermal-conductivity gamma-Y2Si2O7 porous ceramic by a green and environment-friendly foaming-gelcasting process. The method comprises the following steps: by using yttrium oxide and silicon oxide powders as raw materials, citric acid or ammonium citrate as a dispersing agent and technical gelatine as a gelatinizer, stirring the slurry for 1-3 hours, heating to 40-50 DEG C, adding a foaming agent lauryl sodium sulfate or sodium dodecylsulfate, the gelatinizer gelatine and glycerol or polyethyleneglycol for preventing the billet from cracking, and carrying out mold injection; and after demolding, drying at room temperature for 20-30 hours, drying at 65-85 DEG C for 20-30 hours, and finally, carrying out high-temperature reaction sintering at 1500-1550 DEG C for 1-2 hours to obtain the gamma-Y2Si2O7 porous ceramic. The method is green and environment-friendly, does not use any toxic or harmful raw material, is simple, and is low in cost and very suitable for industrial production.

Description

technical field [0001] The invention relates to the field of porous ceramic thermal insulation materials, in particular to a γ-Y material with light weight, high porosity and low thermal conductivity prepared by a green and environmentally friendly foaming and coagulation process. 2 Si 2 o 7 Methods for Porous Ceramic Materials. Background technique [0002] γ-Y 2 Si 2 o 7 Ceramics have broad potential application prospects in high-temperature structural materials, ring barrier coatings of silicon-based ceramics, and thermal insulation materials. Furthermore, γ-Y 2 Si 2 o 7 Due to its excellent chemical and thermal stability (stable from room temperature to 1500°C), and low thermal conductivity (<2W / (m K), >1000°C) (Z.Q.Sun, et al.J. Am.Ceram.Soc. (Journal of the American Ceramic Society). 2008 (91) [8]: 2623-2629.), after the ceramics are prepared into porous ceramics, γ-Y 2 Si 2 o 7 Porous ceramics not only have lower density and good stability, but also ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B35/16C04B35/505
Inventor 王京阳吴贞孙鲁超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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