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Method for preparing Y2SiO5 porous material with high temperature resistance and low thermal conductivity

A technology of porous materials and low thermal conductivity, which is applied in the field of high-temperature-resistant and heat-insulating materials, can solve the problems of inability to prepare high-porosity samples, large sintering shrinkage, and low compressive strength, and achieve high strength, non-toxic and harmless types, The effect of high porosity

Inactive Publication Date: 2016-10-05
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

Published research work adopts Y 2 SiO 5 Cooked powder is raw material, and there are some deficiencies, such as: 1, with Y 2 SiO 5 The samples prepared with cooked powder as raw material have a large sintering shrinkage rate, and the shrinkage rate of the sample with a porosity of 60% obtained by sintering at 1450-1500°C is 18.51%-20.8%; 2. The compressive strength of the sample is low, The strength of the sample with a porosity of 71% is only 3.34MPa; 3, due to the large shrinkage, it is impossible to prepare a sample with a high porosity, and the highest porosity of the prepared sample is only about 70%; 4, using tert-butanol (TBA ) Toxic solvents (Document: Z.G.Hou, et al.Ceram.Int. (International Journal of Ceramics). 2013(39): 969-976; R.B.Zhang, et al.Mater.Design. (Materials and Design Journal )2013(46):746-750)

Method used

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  • Method for preparing Y2SiO5 porous material with high temperature resistance and low thermal conductivity
  • Method for preparing Y2SiO5 porous material with high temperature resistance and low thermal conductivity
  • Method for preparing Y2SiO5 porous material with high temperature resistance and low thermal conductivity

Examples

Experimental program
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Effect test

Embodiment 1

[0024] First weigh 30g of deionized water, stir continuously and add 0.75g of polyammonium methacrylate and Y 2 o 3 : SiO 2 90g of mixed powder with a molar ratio of 1:2, stirred for 1 hour to form a ceramic slurry;

[0025] The ceramic slurry is then placed in a water bath at 35° C., 0.75 g of ammonium lauryl sulfate is added, stirred rapidly (the speed of the stirrer is 1500 rpm) and foamed for 20 minutes, then 1.75 g of gelatin and polyethylene glycol (molecular weight 6000 ) 3g, followed by injection molding, forming green body after demoulding;

[0026] Dry the green body at room temperature for 36 hours, then dry it in an oven at 70°C for 24 hours, and finally perform high-temperature reaction sintering at 1450°C in air for 2 hours to synthesize Y with high porosity, high temperature resistance and low thermal conductivity. 2 SiO 5 porous material.

[0027] In this example, Y 2 SiO 5The porosity of the porous material is 76%, the thermal conductivity is 0.35W / (m·K...

Embodiment 2

[0029] First weigh 45g of deionized water, stir continuously and add 1.5g of sodium hexametaphosphate and Y 2 o 3 : SiO 2 100g of mixed powder with a molar ratio of 1:2, stirred for 2 hours to form a ceramic slurry;

[0030] Then the ceramic slurry is placed in a water bath at 45°C, 1.2 g of sodium lauryl sulfate is added, and the rapid stirring (the speed of the stirrer is 1600 rpm) is foamed for 15 minutes, then 3.6 g of gelatin and polyethylene glycol (molecular weight 2000) are added. ) 5g, followed by injection molding, forming green body after demoulding;

[0031] Dry the green body at room temperature for 40 hours, then dry it in an oven at 80°C for 18 hours, and finally perform high-temperature reaction sintering at 1500°C in air for 3 hours to synthesize Y with high porosity, high temperature resistance and low thermal conductivity. 2 SiO 5 porous material.

[0032] In this example, Y 2 SiO 5 The porosity of the porous material is 83%, the thermal conductivity ...

Embodiment 3

[0034] First weigh 55g of deionized water, stir continuously and add 2g of ammonium citrate and Y 2 o 3 : SiO 2 110g of mixed powder with a molar ratio of 1:2 was stirred for 2.5 hours to form a ceramic slurry;

[0035] Then place the ceramic slurry in a water bath at 50°C, add 2g of sodium dodecylsulfonate, stir rapidly (the speed of the mixer is 1700rpm) for foaming for 5 minutes, then add 5g of gelatin and polyethylene glycol (molecular weight 10000) 7g, followed by injection molding, forming green body after demoulding;

[0036] Dry the green body at room temperature for 48 hours, then dry it in an oven at 90°C for 12 hours, and finally perform high-temperature reaction sintering at 1550°C in air for 2.5 hours to synthesize Y with high porosity, high temperature resistance and low thermal conductivity. 2 SiO 5 porous material.

[0037] In this example, Y 2 SiO 5 The porosity of the porous material is 89%, the thermal conductivity is 0.11W / (m·K), the compressive stre...

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Abstract

The invention specifically relates to a method for preparing an Y2SiO5 porous material with high temperature resistance and low thermal conductivity, belonging to the field of high-temperature-resistant thermal-insulating materials. The Y2SiO5 porous material with high porosity, high temperature resistance and low thermal conductivity is prepared by using a green environment-friendly in-situ foaming-gel casting method and using reactive sintering process. The method comprises the following steps: with yttrium oxide and silicon oxide powder as raw materials, adding water and a dispersing agent to prepare ceramic slurry and carrying out continuous stirring; then carrying out heating, adding a foaming agent and carrying out fast stirring for foaming; then adding gelatin and polyethylene glycol; then carrying out injection molding and demoulding; and after drying of a green body, carrying out high-temperature reactive sintering so as to prepare the Y2SiO5 porous ceramic material. The method provided by the invention can synthesize Y2SiO5 porous ceramic with high porosity, high temperature resistance, low thermal conductivity, good oxidation resistance and a unique secondary pore structure, and the Y2SiO5 porous ceramic has great application prospect in the field of high-temperature-resistant thermal-insulating materials. Compared with conventional gel-casting methods using monomer like acrylamide with neurotoxicity, the method provided by the invention has the advantages of simple production process, low cost and wide industrial production prospect.

Description

technical field [0001] The invention relates to the field of high-temperature-resistant heat-insulating materials, in particular to a high-temperature-resistant and low-thermal conductivity Y 2 SiO 5 The preparation method of porous materials, through the green and environmental protection in-situ foaming coagulation process and reaction sintering process to prepare high-porosity high-temperature resistant and low thermal conductivity Y 2 SiO 5 porous material. Background technique [0002] Y 2 SiO 5 Ceramics have many excellent properties, such as: high melting point (1950°C), good damage tolerance, extremely low oxygen permeability, low dielectric constant, good high temperature stability, and extremely low thermal conductivity— 1.34W / (m·K)(600~900℃) (Z.Q.Sun, et al.J.Eur.Ceram.Soc. (Journal of European Ceramic Society).2009(29):551-557.). With excellent performance, Y 2 SiO 5 Ceramics have attractive application prospects in high-temperature functional-structural ...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B35/16C04B35/622
Inventor 王京阳吴贞孙鲁超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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