Preparation method of yttrium silicate ceramic powder

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...

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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 no matter whether the forward titration method or the reverse titration method is used

In a word, so far, there is no report on the preparation of yttrium silicate ultrafine powder with a single crystal form by reverse co-precipitation method.

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