Preparation method of yttrium-silicon-oxygen porous high-temperature ceramic material

A technology of high-temperature ceramics and porous ceramics, which is applied in the field of preparation of yttrium-silicon-oxygen porous high-temperature ceramic materials to achieve the effects of improving synthesis efficiency, broadening application range, and low cost

Active Publication Date: 2013-04-03
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

[0003] The object of the present invention is to provide a kind of preparation method of yttrium silicon oxyg

Method used

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  • Preparation method of yttrium-silicon-oxygen porous high-temperature ceramic material
  • Preparation method of yttrium-silicon-oxygen porous high-temperature ceramic material
  • Preparation method of yttrium-silicon-oxygen porous high-temperature ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, clean the surface of the polyurethane foam template with a porosity of 60ppi (pores per inch) with deionized water, take it out and dry it; then soak it in a NaOH solution with a mass fraction of 20% at 50°C for 3 hours, and then clean it with deionized water and drying; then soaked in a 1% CMC (sodium carboxymethylcellulose) solution for 2 hours and then dried.

[0021] Will Y 2 SiO 5 Powder 52g, deionized water 5g, CMC solution (mass fraction 1%) 10g, silica sol (mass fraction 30%) 30g, kaolin 0.5g and polyethylene glycol (molecular weight 20000) 0.2g were mixed to prepare slurry , and adjust the pH value of the slurry to 9. The treated foam formwork is dipped in the slurry and hangs the slurry twice, each dipping is 30s, and the excess slurry in the formwork is removed by centrifugation and dried to obtain a prefabricated body.

[0022] Next, the preform is heated to 700°C in the air for pretreatment, the heating rate is 0.5°C / min, and the holding time is 1...

Embodiment 2

[0024] First clean the surface of the polyurethane foam template with a porosity of 60ppi (pores per inch) with deionized water, take it out and dry it; then soak it in a NaOH solution with a mass fraction of 15% at 60°C for 2 hours, and then clean it with deionized water and drying; then soaked in a 2% CMC (sodium carboxymethylcellulose) solution for 3 hours and then dried.

[0025] Will Y 2 SiO 5 60g of powder, 7.5g of deionized water, 6.5g of CMC solution (2% by mass fraction), 35g of silica sol (25% by mass fraction), 0.8g of kaolin and 0.5g of polyethylene glycol (molecular weight of 6000) were mixed and prepared slurry, and adjust the pH value of the slurry to 10. The treated foam formwork was dipped in the slurry and slurryed 4 times for 30s each time, and the excess slurry in the formwork was removed by centrifugation and dried to obtain a prefabricated body.

[0026] Next, the preform is heated to 900°C in the air for pretreatment, the heating rate is 1°C / min, and ...

Embodiment 3

[0028] Use deionized water to clean the surface of the polyurethane foam template with a porosity of 60ppi (pores per inch), take it out and dry it; then soak it in a NaOH solution with a mass fraction of 20% at 55°C for 2.5h, then wash it with deionized water Washing and drying; then soaking in 1% CMC (sodium carboxymethylcellulose) solution for 3 hours and then drying.

[0029] Will Y 2 SiO 5Powder 50g, deionized water 6g, CMC solution (mass fraction is 2%) 5g, silica sol (mass fraction is 30%) 35g, kaolin 0.7g and ammonium citrate 0.4g mix and prepare slurry, and slurry pH Adjust the value to 11. The treated foam formwork was dipped in the slurry, and the slurry was hung for 3 times, each dipping was 30s, and the excess slurry in the formwork was removed by centrifugation and dried to obtain a prefabricated body.

[0030] Next, the preform is heated to 800°C in the air for pretreatment, the heating rate is 0.5°C / min, and the holding time is 1.5h, and the organic foam ske...

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Abstract

The invention relates to the field of porous high-temperature ceramic materials, in particular to a method for preparing a yttrium-silicon-oxygen porous high-temperature ceramic material by an organic foam impregnating technology. The method comprises the following steps: with organic polyurethane foam as a template, after alkali corrosion and soaking pretreatment by a CMC (carboxyl methyl cellulose) solution, impregnating and slurrying in a Y2SiO5 slurry (prepared by mixing Y2SiO5 powder, the CMC solution, silica sol, kaolin, and polyethylene glycol or ammonium citrate); centrifuging and drying to remove excessive slurry in the template; performing thermal treatment at 700-900 DEG C to remove the organic foam template, and presintering; performing high-temperature reaction and sintering for 1.5-2.5 hours at 1,500-1,550 DEG C; and preparing the Y2Si2O7 porous high-temperature ceramic. The preparation method is simple and convenient and low in cost, and is applicable to preparation of the Y2Si2O7 porous ceramic material with a controllable pore structure and a relatively compact skeleton; and by the preparation method, the synthesis efficiency of such materials can be greatly improved and the application range of the materials in the technical field can be widened.

Description

technical field [0001] The invention relates to the field of porous high-temperature ceramic materials, specifically a kind of yttrium silicon oxide (Y 2 Si 2 O7) A method for preparing a porous high-temperature ceramic material. Background technique [0002] Yttrium silicon oxide (Y 2 Si 2 O7) Ceramic is a silicate with a high melting point (1775°C), and it is a new type of high-temperature structural ceramic with broad application prospects. It has many excellent properties, such as extremely low thermal conductivity, good oxidation and thermal corrosion resistance, excellent chemical and thermal stability, low Young's modulus, and room temperature quasi-plasticity. It can have a wide range of applications in aviation and aerospace fields, such as: as a ring barrier coating for silicon-based high-temperature ceramics, a thermal barrier coating for superalloys, and an advanced thermal insulation material with ultra-low thermal conductivity. Currently, for Y 2 Si 2 Th...

Claims

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Application Information

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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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