Manufacture method of high porosity and high strength yttrium-silicon-oxygen porous ceramics

A technology of porous ceramics and high porosity is applied in the field of porous ceramic materials to achieve the effects of convenient operation, reduced thermal conductivity and easy mass production

Active Publication Date: 2014-02-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are many studies on the preparation and performance of yttrium silicon oxide ceramic bulk materials and coatings, and γ-Y 2 Si 2 o 7 There are few reports on the synthesis and properties of porous ceramics

Method used

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  • Manufacture method of high porosity and high strength yttrium-silicon-oxygen porous ceramics
  • Manufacture method of high porosity and high strength yttrium-silicon-oxygen porous ceramics

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preparation example Construction

[0024] The present invention has high porosity and high strength yttrium silicon oxide (γ-Y 2 Si 2 o 7 ) The preparation method of porous ceramic material, concrete steps are as follows:

[0025] 1) Preparation of slurry: by mass parts, Y 2 o 3 and SiO 2 80-120 parts of mixed powder with a molar ratio of 1:2, 30-50 parts of deionized water, 4-8 parts of organic monomer, 0.5-1.5 parts of dispersant, cross-linking agent N,N'-methylenebisacrylamide 0.3-0.9 parts are used as raw materials, mixed, and then stirred for 1-4 hours to form a slurry;

[0026] 2) Add 0.5-1.5 parts of foaming agent sodium lauryl sulfate and stir quickly (the speed range of the mixer is 1000-2000rpm) for foaming for 15-30 minutes, then add 0.5-1.5 parts of peeling inhibitor, catalyst N, N , 2-6 parts of N',N'-tetramethylethylenediamine and 1-5 parts of initiator ammonium persulfate, after stirring for 20-60 seconds, injection molding is performed immediately, and a green body is formed after demouldi...

Embodiment 1

[0031] First weigh 50g of deionized water, then add polyethyleneimine 1.5g, acrylamide 6g, N,N′-methylenebisacrylamide 0.9g, and Y 2 o 3 and SiO 2 Mix 120g of mixed powder with a molar ratio of 1:2, and then stir for 4 hours to form a slurry;

[0032] Then add 1.5 g of sodium lauryl sulfate to the slurry, stir rapidly (the speed of the mixer is 1500 rpm) to foam for 30 minutes, then add 1.5 g of polyethylene oxide, N, N, N', N'-tetramethyl Ethylenediamine mass fraction is 15% aqueous solution 6g and ammonium persulfate mass fraction is 25% aqueous solution 5g, after stirring for 20 seconds, injection molding solidifies immediately, forms green body after demoulding;

[0033] The green body was dried at room temperature for 48 hours, then dried in an oven at 90°C for 24 hours, and finally heated to 1525°C in air at a rate of 6°C / min for high-temperature reaction sintering and kept for 2 hours to obtain γ-Y 2 Si 2 o 7 porous ceramics. In this embodiment, the porosity of th...

Embodiment 2

[0035] First weigh 30g of deionized water, add 0.5g of ammonium citrate, 4g of acrylamide, 0.3g of N,N′-methylenebisacrylamide, and Y 2 o 3 and SiO 2 Mix 80g of mixed powder with a molar ratio of 1:2, and then stir for 1 hour to form a slurry;

[0036] Then add 0.5g of sodium lauryl sulfate to the slurry, stir rapidly (the speed of the mixer is 1800rpm) to foam for 15 minutes, then add 0.5g of polyethylene glycol, N,N,N',N'-tetramethyl Ethylenediamine massfraction is 25% aqueous solution 2g and ammonium persulfate massfraction is 20% aqueous solution 4g, after stirring for 60 seconds, injection molding is solidified immediately, forms green body after demoulding;

[0037] The green body was dried at room temperature for 24 hours, then dried in an oven at 60°C for 36 hours, and finally heated to 1500°C in air at a rate of 4°C / min for high-temperature reaction sintering and kept for 2.5 hours to obtain Y 2 Si 2 o 7 porous ceramics. In this embodiment, the porosity of the s...

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Abstract

The invention relates to the porous ceramics material field, and concretely relates to a method for manufacturing high porosity and high strength yttrium-silicon-oxygen porous ceramics material through a foaming injection coagution process. According to the method, yttrium oxide and silicon oxide mixed power can be taken as a raw material, water is taken as a disperse medium, polyethyleneimine or ammonium citrate is selected as a dispersant, acrylamide or N-methylolacrylamide is taken as a monomer, a cross-linking agent N,N'-methylene bisacrylamide is added, a foaming agent sodium dodecyl sulfate, a peeling inhibitor polyoxyethylene, a catalyst N, N, N',N'-tetramethyl ethylenediamine and an initiator ammonium persulfate are added after stirring, and then injection mold solidification is carried out, drying is carried out for 24-48 hours at room temperature after demoulding, and then drying is carried out for 24-36 hours under the temperature of 60-90 DEG C, high temperature reaction sintering is carried out for 1.5-2.5 hours under the temperature of 1500-1550 DEG C finally, and the gamma-Y2Si2O7 porous ceramics can be finally manufactured. The manufactured gamma-Y2Si2O7 porous ceramics material having a multi-layer pore structure has controllable porosity with high porosity (75-85%) and high strength (3-8MPa).

Description

technical field [0001] The invention relates to the field of porous ceramic materials, in particular to a method of preparing high-porosity and high-strength yttrium silicon oxide (γ-Y 2 Si 2 o 7 ) methods for porous ceramic materials. Background technique [0002] Yttrium silica (γ-Y 2 Si 2 o 7 ) Ceramics have many excellent properties, such as extremely low thermal conductivity (<3W / (m K), >300℃), small thermal expansion coefficient (~3.9×10 -6 K -1 , 25~1400℃), good damage tolerance, high thermal corrosion resistance, and excellent chemical and thermal stability (J.Y.Wang, et al.Acta.Mater. (Materials). 2007(55):6019– 26.). With its excellent comprehensive performance, γ-Y 2 Si 2 o 7 Ceramics have broad application prospects, for example, they can be used as high-temperature structural materials, ring barrier coatings for silicon-based ceramics, and excellent thermal insulation materials. [0003] At present, there are many studies on the preparation and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/505C04B38/06C04B35/622
Inventor 王京阳吴贞孙鲁超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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