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Method for preparing intermediate layer of environmental barrier coating by using TiC modified mullite

A technology of mullite and environmental barrier, which is applied in the field of preparing the intermediate layer of environmental barrier coating by using TiC modified mullite, which can solve the problems of low coating bonding strength, coating pores and cracks, etc.

Active Publication Date: 2022-04-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to modify the mullite intermediate layer by nano-TiC, in order to solve the problems such as defects such as pores and cracks in the coating of the environmental barrier coating, and the coating bonding strength is too low, by modifying the mullite intermediate layer by nano-TiC , breaking through the engineering application bottleneck of nanostructured environmental barrier coatings

Method used

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  • Method for preparing intermediate layer of environmental barrier coating by using TiC modified mullite
  • Method for preparing intermediate layer of environmental barrier coating by using TiC modified mullite
  • Method for preparing intermediate layer of environmental barrier coating by using TiC modified mullite

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specific Embodiment approach 1

[0047] Specific embodiment 1: In this embodiment, the method for preparing the intermediate layer of the environmental barrier coating with TiC modified mullite is carried out according to the following steps:

[0048] Step 1. Put deionized water and zirconia ceramic grinding balls into the ball mill and stir evenly, then add nano-TiC powder and nano-SiO 2 Powder and Nano Al 2 o 3 For powder, the mass ratio of water to material is 2:1, and the mass ratio of ball to material is 3:1; then add ammonium citrate with 1% of the mass of the powder and mix it evenly by ball milling, then add gum arabic or polyvinyl alcohol with 2% of the mass of the powder, Continue ball milling and stirring for 12-24h to obtain slurry;

[0049] The Al 2 o 3 The quality of the powder is nano-SiO 2 Powder and Nano Al 2 o 3 70.83-72.83% of the total mass of the powder; the mass of nano-TiC powder is nano-SiO 2 Powder and Nano Al 2 o 3 5%-35% of the total mass of the powder;

[0050] Step 2, s...

specific Embodiment approach 2

[0062] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is:

[0063] Nanometer Al described in step 1 2 o 3 The mass purity of the powder is >99%, nano-SiO 2 The mass purity of the powder is >99%, and the mass purity of the nano-TiC powder is >98%;

[0064] Nanometer Al described in step 1 2 o 3 The particle size of the powder is 10-25nm, nano SiO 2 The particle size of the powder is 10-30nm, and the particle size of the nano-TiC powder is 20-60nm.

specific Embodiment approach 3

[0065] Specific embodiment 3: This embodiment differs from specific embodiment 1 or 2 in that: the spray drying and granulation process described in step 2 is as follows: the inlet air temperature is 240-250°C, the outlet air temperature is 110-120°C, and the rotation speed is 18000°C -20000r / min, feed rate is 1L h -1 .

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Abstract

The invention discloses a method for preparing an intermediate layer of an environmental barrier coating by using TiC modified mullite, and relates to a method for preparing the intermediate layer of the environmental barrier coating. The problems that an environment barrier coating has the defects of pores, cracks and the like, and the bonding strength of the coating is too low are solved. The method comprises the following steps: preparing nano TiC powder, nano SiO2 powder and nano Al2O3 powder slurry, and carrying out spray drying granulation to obtain mixed powder; loose sintering is carried out on the mixed powder to obtain nano TiC modified nano-structure mullite powder, and then the nano TiC modified nano-structure mullite powder is granulated to obtain nano TiC modified nano-structure mullite particles; plasma spheroidizing is carried out; or after loose sintering of the mixed powder, the mixed powder is mixed with the nano TiC powder. The intermediate layer of the environmental barrier coating prepared from nanoscale TiC not only has a crack self-healing function, but also has an obvious interface enhancement effect. And the bonding strength of the environmental barrier coating can be improved. The method is suitable for preparing the intermediate layer of the environmental barrier coating.

Description

technical field [0001] The invention relates to a method for preparing an intermediate layer of an environmental barrier coating by utilizing TiC modified mullite. Background technique [0002] The development of "two machines" (aeroengines and gas turbines) reflects a country's comprehensive national strength, scientific level and industrial capabilities. The development of "two machines" technology has become the primary task of many countries in the world, and it is also the key research content of many scientific researchers. With the increase of thrust-to-weight ratio and inlet temperature of the engine, more stringent requirements are put forward for the development of a new generation of "two-machine" material technology. The development of engines with high thrust-to-weight ratio and high inlet temperature is being focused by scientific researchers. focus on. As a result, the traditional nickel-based superalloy, which was once regarded as the material of choice for ...

Claims

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Application Information

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IPC IPC(8): C04B35/185C04B35/622C04B35/626
CPCY02T50/60
Inventor 王铀刘赛月张晓东王东升
Owner HARBIN INST OF TECH