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Sol-gel process for preparing Yb2SiO5 powder

A sol-gel and powder technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., to achieve the effect of good repeatability and simple process

Inactive Publication Date: 2010-01-20
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sol-gel preparation method of yttrium silicate and lutetium silicate powder has been reported, but the sol-gel preparation method of ytterbium silicate powder has not been reported

Method used

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  • Sol-gel process for preparing Yb2SiO5 powder
  • Sol-gel process for preparing Yb2SiO5 powder
  • Sol-gel process for preparing Yb2SiO5 powder

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) 70.06g ytterbium nitrate Y b (NO 3 ) 3 ·nH 2 O (n=6~7) was dissolved in 70.03g ethanol under the condition of 70℃ water bath, then the temperature of the solution was lowered to room temperature, the solution concentration was 1.70mol / L, TEOS:H 2 O:C 2 h 5 OH=1:12:20;

[0023] (2) At room temperature, add 15.62g TEOS into the ethanol solution of ytterbium nitrate, stir to make it evenly mixed;

[0024] (3) 0.5 ml of hydrochloric acid as a catalyst is added dropwise in the above-mentioned solution under stirring to obtain a reaction mixture;

[0025] (4) Stir the above reaction mixture vigorously for 12 hours under the condition of a water bath at 70° C. to obtain a transparent sol;

[0026] (5) Aging the sol for 24 hours at room temperature to obtain a gel;

[0027] (6) Dry the wet gel in an oven at 200°C for 8 hours to obtain a dry gel, and grind it into a fine powder in a mortar;

[0028] (7) Calcining the xerogel powder at 1200°C for 1 hour to obtain Yb ...

Embodiment 2

[0030] (1) 35.03g ytterbium nitrate Y b (NO 3 ) 3 ·nH 2 O (n=6~7) was dissolved in 12.42g ethanol under the condition of 80 ℃ water bath, then the temperature of the solution was lowered to room temperature, the solution concentration was 4.77mol / L, TEOS:H 2 O:C 2 h 5 OH=1:12:7;

[0031] (2) At room temperature, add 7.8g TEOS into the ethanol solution of ytterbium nitrate, stir to make it evenly mixed;

[0032] (3) 0.25ml of hydrochloric acid as a catalyst is added dropwise in the above solution under stirring to obtain a reaction mixture;

[0033] (4) Vigorously stir the above reaction mixture for 10 min in a water bath at 70°C to obtain a transparent sol;

[0034] (5) aging the sol at room temperature for 16 hours to obtain a gel;

[0035] (6) Dry the wet gel in an oven at 200°C for 8 hours to obtain a dry gel, and grind it into a fine powder in a mortar;

[0036] (7) Calcining the xerogel powder at 1200°C for 1 hour to obtain Yb with a particle size of about 1 μm ...

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Abstract

The present invention relates to sol-gel process of preparing Yb2SiO5 powder, and features that Yb2SiO5 precursor sol is first obtained with ethyl acetate and ytterbium nitrate as materials and through hydrolysis and condensation reaction in water and alcohol solution, and then heat treated at 1200 deg.c to obtain Yb2SiO5 powder. The process is simple and has high repeatability, and the prepared Yb2SiO5 powder in submicron level is hopeful in application as the oxidation and degradation resisting coating material for fiber reinforced SiC-base composite material.

Description

technical field [0001] The invention belongs to the field of ceramic ultrafine powder prepared by a sol-gel method, in particular to a monodisperse submicron ytterbium silicate (Yb 2 SiO 5 ) powder sol-gel preparation process. Background technique [0002] Fiber-reinforced SiC ceramic matrix composites, such as SiC fiber-reinforced SiC (SiC / SiC), C fiber-reinforced (C / SiC), may replace Ni-based superalloys due to their superior high-temperature mechanical properties and stability. Hot end structural components of aero turbine engines. However, a major problem is its lack of stability in high-velocity gas environments containing high-temperature water vapor. Adding coatings to the surface of composite materials is an effective way to solve this problem. Units such as NASA have done a lot of research on this. The results show that among various coating materials, rare earth silicates, especially ytterbium silicate, are favored due to their superior high temperature resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/20C01F17/00C04B35/50C04B35/16C04B35/624
Inventor 温海明董绍明丁玉生张翔宇和平
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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