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A material and method for porosity regulation and strength supplementation of thermal barrier coatings

A technology of thermal barrier coating and porosity, applied in coating, metal material coating process, fusion spraying, etc., can solve problems such as failure, thermal barrier coating peeling, etc., and achieve the effect of improving melting performance

Active Publication Date: 2021-06-01
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the porosity is too high, the coating will be exposed to complex service conditions. With the accumulation of thermal stress during the cooling and heating cycle, crack initiation and expansion are prone to occur at high porosity areas, resulting in large-scale peeling and failure of the thermal barrier coating.

Method used

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  • A material and method for porosity regulation and strength supplementation of thermal barrier coatings
  • A material and method for porosity regulation and strength supplementation of thermal barrier coatings
  • A material and method for porosity regulation and strength supplementation of thermal barrier coatings

Examples

Experimental program
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Effect test

Embodiment 1

[0058] 1. Containing 5% La by mass fraction 2 o 3 Preparation of YSZ pore-inhibiting powder for pore-inhibiting modified phase: firstly, La 2 o 3 and YSZ original powder were air-dried separately, the drying temperature was 900 ° C, and the drying time was 1 h; secondly, the La 2 o 3 Powder, YSZ powder, 15% trimethylamine aqueous solution dispersant, and ceramic balls were added to the ball mill tank according to the mass ratio for suspension adsorption mixing. The powder is washed and filtered; finally, the pore suppressing powder is sprayed and granulated at an inlet temperature of 360°C and an outlet temperature of 125°C, and the particle size of the final product is 20 μm-160 μm.

[0059] 2. Preparation of YSZ toughened pore-forming powder containing 8% SiC fiber toughened and pore-forming modified phase by mass fraction: First, carry out stirring, purification and dispersion, and use hydrofluoric acid and polyglycol at a mass ratio of 1:1 to purify the dispersion, 10...

Embodiment 2

[0067] 1. Containing a mass fraction of 4% La 2 o 3 with 4% CeO 2 Preparation of YSZ pore-inhibiting powder for pore-inhibiting modified phase: firstly, La 2 o 3 , CeO 2 and YSZ original powder were air-dried separately, the drying temperature was 900 ° C, and the drying time was 1 h; secondly, the La 2 o 3 Powder, CeO 2 Powder YSZ powder, 15% trimethylamine aqueous solution dispersant, and ceramic balls are added to the ball mill tank according to the mass ratio for suspension adsorption mixing. Perform washing and suction filtration; finally, spray and granulate the pore-suppressing powder under the condition that the inlet temperature is 360°C and the outlet temperature is 125°C, and the particle size of the final product is 20μm-160μm.

[0068] 2. Preparation of YSZ pore-forming powder containing 8% YSZ fiber toughened pore-forming modified phase by mass fraction: First, carry out stirring, purification and dispersion, and use hydrofluoric acid and polyglycol with a...

Embodiment 3

[0073] 1. Containing 5% La by mass fraction 2 o 3 BaLn 2 Ti 3 o 10 (BLT) anti-pore powder preparation: first, La 2 o 3 and BLT raw powder were blast-dried separately, the drying temperature was 900°C, and the drying time was 1h; secondly, La 2 o 3 Powder, BLT powder, 15% trimethylamine aqueous solution dispersant, and ceramic balls were added to the ball mill tank according to the mass ratio for suspension adsorption mixing. The powder is washed and filtered; finally, the pore suppressing powder is sprayed and granulated at an inlet temperature of 360°C and an outlet temperature of 125°C, and the particle size of the final product is 20 μm-160 μm.

[0074] 2. Preparation of BLT pore-forming powder containing 4% SiC fiber and 4% YSZ fiber toughened pore-forming modified phase by mass fraction: first, carry out stirring, purification and dispersion, and use hydrofluoric acid and polyglycol at a mass ratio of 1:1 for purification Dispersion liquid, 100r / min magnetic stirr...

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Abstract

The invention relates to a material and method for porosity regulation and strength supplementation of a thermal barrier coating, comprising: blending a porosity-inhibiting modified phase that inhibits the formation of pores and a ceramic matrix powder to prepare a thermal barrier coating for spraying. Pore ​​powder: the toughened pore-forming modified phase that promotes the formation of pores is blended with the ceramic matrix powder to prepare the toughened pore-forming powder for thermal barrier coating spraying. Prepare pore-suppressing powder and toughening pore-forming powder by means of mechanical mixing, suspension suction, suspension dispersion, and spray granulation; put the pore-suppressing powder into the first powder feeding cylinder of the synchronous powder feeder, and put the toughening pore-forming powder into the first powder feeding cylinder of the synchronous powder feeder. In the second powder feeding cylinder of the synchronous powder feeder; by precisely controlling the ratio of pore-suppressing powder and toughening pore-forming powder, a plasma-sprayed ceramic functional layer with controllable porosity is prepared on the surface of the bonding layer. The invention makes full use of the properties of the pore-suppressing modified phase and the toughening and pore-forming modification relative to the regulation of the porosity of the thermal barrier coating, so as to fully exert the thermal insulation performance of the pores of the thermal barrier coating and avoid the reduction of the stability of the mechanical structure of the coating. .

Description

technical field [0001] The invention relates to the field of surface engineering, in particular to the field of materials and methods for porosity regulation and strength supplementation of thermal barrier coatings. Background technique [0002] With the rapid development of ship equipment, large-tonnage modern ships have higher and higher requirements for the power and efficiency of their main power source, the gas turbine, which is specifically reflected in the higher intake temperature of the turbine part. However, high-temperature components such as turbine blades are limited by the high-temperature stability limit of their own high-temperature alloys and cannot reliably serve for a long time at the intake temperature. Therefore, a layer of thermal barrier coating must be prepared on the surface to ensure the service stability of the blades at high temperatures. . Among them, the main heat insulation principle of the thermal barrier coating is the heat insulation perfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/04C23C4/10C23C4/11
CPCC23C4/04C23C4/10C23C4/11C23C4/134
Inventor 金国房永超崔秀芳刘二宝张丹温鑫
Owner HARBIN ENG UNIV
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