Preparation method of yttrium silicate ceramic powder

A technology of ceramic powder and yttrium silicate, which is applied in the field of preparation of oxide ceramic materials, can solve the problem that it is difficult to obtain products with a single crystal form, and achieve the effect of stable pH value, high purity, and guaranteed purity

Active Publication Date: 2014-08-27
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

The system used in this method is Sc 2 o 3 -Y 2 o 3 -ZrO 2 , Y 2 o 3 -ZrO 2 , La 2 o 3 -Y 2 o 3 -ZrO 2 and other systems, in addition, from the existing data, it is difficult to obtain a product with a single crystal form n...

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  • Preparation method of yttrium silicate ceramic powder
  • Preparation method of yttrium silicate ceramic powder
  • Preparation method of yttrium silicate ceramic powder

Examples

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Embodiment 1

[0051] Take the preparation of 10 kg of yttrium silicate ceramic powder as an example. Weigh 7.9 kg Y 2 o 3 Dissolve in excess nitric acid, add deionized water to prepare 1mol / LY(NO 3 ) 3 Clear solution. According to Y 2 SiO 5 Medium SiO 2 % by weight, converted to tetraethyl orthosilicate TEOS ((C 2 h 5 ) 4 SiO 4 ) is 8.1L, the density of tetraethyl orthosilicate is 0.929g / ml, SiO 2 The content is 28%. Measure 8.1L tetraethyl orthosilicate, mix with 8.1L absolute ethanol (ErOH) and 36.4L deionized water (H 2 O) mix, and prepare tetraethyl orthosilicate prehydrolyzate. 1mol / LY(NO 3 ) 3 solution and TEOS:ErOH:H 2 O = 1:1:4 pre-hydrolyzate mix. Take 50L of distilled water and adjust its pH to 9-10 with concentrated ammonia water. Slowly add the above mixed solution into ammonia water with a pH value of 9-10 to carry out chemical co-precipitation reaction, adjust the reaction system with 2-fold diluted ammonia water to keep the pH value at 9-10. During this rea...

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Abstract

The invention relates to a preparation method of yttrium silicate ceramic powder, in particular relates to a preparation method of yttrium silicate ceramic powder for environment barrier coating, and belongs to the technical field of oxide ceramic material preparation. The method comprises the following steps: using a yttrium solution with Y<3+> ion concentration of 0.6-1.5 mol/L as solution A; weighing silicate ester according to a molar ratio of Y to Si being 2: 1; adding alcohol and water in the weighed silicate ester according to a volume ratio of the silicate ester to alcohol to water being 1: 1-2: 2-6 to obtain solution B; uniformly mixing the solutions A and B solution to obtain the mixed solution containing aluminum and silicon; adding the mixed solution containing aluminum and silicon into ammonium hydroxide with pH value of 9-10 at a speed of dropwise adding 0.2-0.5 L of the mixed solution containing aluminum and silicon in 1L of precipitator every minute, and stirring to obtain the co-precipitate; after the reaction is finished, standing, filtering, washing and drying the residue, calcining for at least 4 hours at 800-1000 DEG.C to obtain the Y2SiO5 ceramic composite powder. The method provided by the invention is short in reaction period and good in repeatability; and the obtained product is high in purity and is of a single crystal form.

Description

technical field [0001] The invention relates to a preparation method of yttrium silicate ceramic powder, in particular to a preparation method of yttrium silicate ceramic powder for an environmental barrier coating, belonging to the technical field of oxide ceramic material preparation. The composite powder is used to prepare an environmental barrier coating, and is suitable for high temperature protection on the surface of silicon-based materials such as C / C-SiC composite materials and silicon nitride. technical background [0002] Carbon / carbon-silicon carbide (C / C-SiC) composite material is a ceramic matrix composite material with carbon fiber as the reinforcing phase, which combines the superior mechanical properties of fiber reinforcement and the good chemical and thermal stability of ceramics, and has a high specific Strong, high specific modulus, low density, good oxidation resistance, corrosion resistance, excellent mechanical properties and thermophysical properties...

Claims

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Application Information

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IPC IPC(8): C04B35/16C04B35/622
Inventor 刘怀菲熊翔王雅雷
Owner CENT SOUTH UNIV
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