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Method for preparing heat barrier coating with column form crystal structure ceramic layer

A technology of columnar crystal structure and thermal barrier coating, applied in coating, metal material coating process, air transportation, etc., can solve problems such as coating peeling failure, volume expansion, etc., to improve thermal shock resistance and increase strain The effect of tolerance

Inactive Publication Date: 2007-11-28
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LaTi 2 Al 9 o 19 The melting point is lower than 2000°C, and LaTi prepared by conventional plasma spraying process 2 Al 9 o 19 The coating is amorphous, and the coating crystallizes in a high temperature environment (above 1000°C), causing volume expansion and causing the coating to peel off and fail

Method used

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  • Method for preparing heat barrier coating with column form crystal structure ceramic layer
  • Method for preparing heat barrier coating with column form crystal structure ceramic layer
  • Method for preparing heat barrier coating with column form crystal structure ceramic layer

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Powder materials required for preparing ceramic layer:

[0045] (A) Weigh the commercially available La according to the molar ratio of 1:4:9 2 o 3 Powder (99.99%, particle size 4μm, Youyan Rare Earth New Material Co., Ltd.) 407.5 grams, TiO 2 Powder 399.5g, Al 2 o 3 Powder (analytically pure, Beijing Lanyi Chemical Industry) 1147.05 grams, after 60 minutes of grinding by wet ball milling, a fine powder with a particle size of less than 1 micron was obtained, dried in a drying oven at 110°C and taken out to obtain a dry fine powder .

[0046] (B) Put the fine powder prepared in step (A) into a high-temperature furnace, set the heating rate of the furnace to 4°C min, adjust the reaction temperature to 1500°C, react for 24 hours and cool to room temperature with the furnace, take out the ball mill to Below 5 microns.

[0047] (C) Prepare the binder according to powder: binder=1:0.2 (mass ratio), the binder component is peach gum (the main component is organic sugars...

Embodiment 2

[0057] Example 2 is the same as Example 1 in preparing the powder material, the first step, and the second step process conditions, except for the third step.

[0058] The third step: plasma spraying LaTi 2 al 9 o 19 ceramic layer

[0059] Take the granulated LaTix 2 al 9 o 19 The powder is 1100g, the spraying distance d is set to 30mm, the distance L2 is 70mm, the moving speed of the spray gun is 500mm / s, the plasma spraying voltage is 30V, the current is 800A, the powder feeding amount is 50g / min, and the substrate preheating temperature is 800°C , the thickness of the deposited ceramic layer is 1000 μm, and the deposition time is 20 minutes, that is, the preparation of the thermal barrier coating is completed.

[0060] In the thermal barrier coating prepared by the above process, the deposited ceramic layer has an electronic columnar crystal structure. The deposited coating is heated at 1300K°C (substrate temperature is 950°C to 1050°C) for 5 minutes, and then compre...

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Abstract

The invention discloses a thermal barrier coating preparation method with the columnar crystals coating to solve the problem of non-crystal coating and low anti-thermal in normal plasma spraying for the LaTi2Al9O19 ceramic material. It changes the distance and the technique data of the tack coat and ceramic powder channel in the normal plasma spraying process, so the thermal barrier coating of the LaTi2Al9O19 with the stable energetic and the columnar crystal structure. The thermal isolation temperature is 130deg.C-300deg.C and improves the strain limit and anti-thermal character, the hot circle life can reach above 1500 times and improves by 4 times.

Description

technical field [0001] The invention relates to a method for preparing a thermal barrier coating, more particularly, improving the conventional plasma spraying process so that the ceramic layer prepared by this method has a columnar crystal structure, which can increase the strain capacity of the thermal barrier coating Limit, thermal shock resistance, service life. Background technique [0002] With the development of aviation gas turbine engines towards high thrust-to-weight ratios, the temperature at the front inlet of the turbines has further increased, so higher requirements are placed on the high temperature resistance of high temperature components of the engine. The design outlet temperature of a first-class aero-engine with a thrust-to-weight ratio of 10 has reached above 1850K, and the design outlet temperature of an aero-engine with a thrust-to-weight ratio of 12 or more will exceed 2000K. According to the cooling capacity of the engine, the temperature reaching t...

Claims

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Application Information

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IPC IPC(8): C23C24/00
CPCY02T50/60
Inventor 郭洪波谢小云徐惠彬宫声凯
Owner BEIHANG UNIV
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