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A kind of preparation method of BSAS ceramic powder for environmental barrier coating

A technology of ceramic powder and environmental barrier, applied in the field of ceramic powder processing

Active Publication Date: 2021-08-20
XIAN AEROSPACE COMPOSITE MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report of co-precipitation-hydrothermal synthesis in the existing BSAS powder preparation technology

Method used

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  • A kind of preparation method of BSAS ceramic powder for environmental barrier coating
  • A kind of preparation method of BSAS ceramic powder for environmental barrier coating
  • A kind of preparation method of BSAS ceramic powder for environmental barrier coating

Examples

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Effect test

Embodiment 1

[0047] A kind of 0.5BaO-0.5SrO-Al for environmental barrier coating 2 o 3 -2SiO2 2 (BSAS) preparation method, described method step is as follows:

[0048] Step 1. Mix the barium salt, strontium salt, and aluminum salt evenly according to the molar ratio of Ba:Sr:Al=0.5:0.5:2, then add deionized water and stir until the barium salt, strontium salt, and aluminum salt are completely dissolved to obtain a mixed Solution; the barium salt is barium chloride; the strontium salt is strontium chloride; the aluminum salt is aluminum chloride;

[0049] Step 2, using ammonia water with a mass percentage concentration of 28% as a precipitating agent to carry out coprecipitation treatment on the mixed solution described in step 1 until the pH value of the mixed solution is not lower than 8 to obtain the mixture;

[0050] Step 3: Add orthosilicic acid and deionized water into the mixture described in Step 2, mix evenly according to the molar ratio of Si:Al=1:1, and then add it into the h...

Embodiment 2

[0061] A kind of 0.75BaO-0.25SrO-Al for environmental barrier coating 2 o 3 -2SiO2 2 (BSAS) preparation method of ceramic powder, described method step is as follows:

[0062] Step 1. Mix the barium salt, strontium salt, and aluminum salt according to the molar ratio of Ba:Sr:Al=0.75:0.25:2, and then add deionized water and stir until the barium salt, strontium salt, and aluminum salt are completely dissolved to obtain a mixed Solution; the barium salt is barium chloride; the strontium salt is strontium chloride; the aluminum salt is aluminum chloride;

[0063] Step 2, using ammonia water with a mass percentage concentration of 28% as a precipitating agent to carry out coprecipitation treatment on the mixed solution described in step 1 until the pH value of the mixed solution is not lower than 8 to obtain the mixture;

[0064] Step 3: Add orthosilicic acid and deionized water into the mixture described in Step 2, mix evenly according to the molar ratio of Si:Al=1:1, and the...

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Abstract

The invention provides a method for preparing BSAS ceramic powder for an environmental barrier coating, belonging to the technical field of ceramic powder processing. The powder preparation method comprises the following steps: 1. adding barium salt, strontium salt, and aluminum salt into deionized water in proportion and stirring until completely dissolved to obtain a mixed solution; 2. performing co-precipitation treatment to obtain a mixture; 3. mixing the mixture with silicon The acid is subjected to hydrothermal reaction; 4. After the hydrothermal reaction product is filtered, washed and dried, it is evenly mixed with deionized water and a binder to obtain a slurry; 5. It is spray-dried to obtain pellets; 6. The pellets are sintered and sieved. The BSAS ceramic powder prepared by the invention has uniform distribution of components, high purity, high crystallinity, simple equipment in the process, no high temperature and mechanical crushing in the whole production process, and low production cost.

Description

technical field [0001] The invention relates to a method for preparing BSAS ceramic powder for an environmental barrier coating, belonging to the technical field of ceramic powder processing. Background technique [0002] With the rapid development of a new generation of high thrust-to-weight ratio aeroengines, the operating temperature of the hot-end parts of the high-pressure turbine continues to increase. The turbine inlet temperature (Turbine Inlet Temperature, TIT) is an important technical index that determines the performance of the engine. Thrust-to-weight ratio and thermal efficiency, and at the same time improve the economy of engine operation. The development of military aero-engines with high thrust-to-weight ratio has put forward new requirements for the improvement of TIT. For military aero-engines with a thrust-to-weight ratio of 8, the TIT can reach above 1500°C, and the highest is close to 1700°C. For military aero-engines with a thrust-to-weight ratio of 10...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/195C04B35/626
CPCC04B35/195C04B35/626C04B2235/3213C04B2235/3215
Inventor 白描崔红赵丽娜高勇田凌寒王政
Owner XIAN AEROSPACE COMPOSITE MATERIALS INST