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Preparation method of thermal barrier coating and thermal barrier coating prepared through preparation method

A technology of thermal barrier coating and spraying equipment, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problems of low thermal shock resistance and poor interlayer bonding of the coating, and achieve low cost, Effect of suppressing grain growth and low thermal conductivity

Inactive Publication Date: 2018-08-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal barrier coating prepared by traditional APS has a layered structure, and its thermal insulation performance is better than that of EB-PVD coating, but the interlayer bonding is poor, which makes the thermal shock resistance of the coating lower.

Method used

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  • Preparation method of thermal barrier coating and thermal barrier coating prepared through preparation method
  • Preparation method of thermal barrier coating and thermal barrier coating prepared through preparation method
  • Preparation method of thermal barrier coating and thermal barrier coating prepared through preparation method

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preparation example Construction

[0037] A preparation method of a thermal barrier coating of the present invention adopts a precursor solution composed of zirconium salt and ytterbium salt as a spraying raw material, and in a liquid plasma plasma spraying equipment, sends the solution into a plasma jet through a two-flow atomizing nozzle, And deposited on the substrate to form a thermal barrier coating with uniform pore distribution and vertical crack structure.

[0038] Such as figure 1 As shown, the liquid plasma spraying equipment includes: a container 1 and a two-flow atomizing nozzle 4, one end is inserted into the container 1, and the other end is connected to the hose 2 of the two-flow atomizing nozzle 4, which is arranged on the soft The pipe 2 is provided with a peristaltic pump 3 for driving the liquid in the container 1 to flow into the two-stream atomizing nozzle 4, and a plasma spray gun 10 is provided on the outlet end side of the two-stream atomizing nozzle 4, and the two-stream spray nozzle T...

Embodiment 1

[0049] Weigh 2.76g of ytterbium oxide into a beaker, add excess (about 10mL) concentrated nitric acid and 10mL of deionized water, heat and stir until complete reaction, and form ytterbium nitrate solution. Weigh 85.8g of zirconium nitrate pentahydrate powder into a beaker, and add deionized water to form zirconium nitrate aqueous solution. Add the formed ytterbium nitrate solution to the zirconium nitrate aqueous solution, add deionized water to adjust the concentration, and stir at room temperature to fully mix the two solutions to obtain a precursor solution with a solute concentration of 0.8 mol / L.

[0050] The prepared precursor solution was atomized through a two-flow atomization nozzle at a flow rate of 24 mL / min and then sent into the plasma jet with an atomization gas pressure of 0.2 MPa, and finally a thermal barrier coating was formed on the stainless steel substrate. The spraying distance is 80mm, the current is 600A, and the spraying pressure is 60V. The crystal ...

Embodiment 2

[0052] Weigh 2.76g of ytterbium oxide into a beaker, add excess (about 8mL) concentrated nitric acid and 8mL of deionized water, heat and stir until complete reaction, and form ytterbium nitrate solution. Weigh 85.8g of zirconium nitrate pentahydrate powder into a beaker, and add deionized water to form zirconium nitrate aqueous solution. Add the formed ytterbium nitrate solution to the zirconium nitrate aqueous solution, add deionized water to adjust the concentration, and stir at room temperature to fully mix the two solutions to obtain a precursor solution with a solute concentration of 1.0 mol / L.

[0053] The prepared precursor solution was atomized through a two-flow atomization nozzle at a flow rate of 24 mL / min and then sent into the plasma jet with an atomization gas pressure of 0.2 MPa, and finally a thermal barrier coating was formed on the stainless steel substrate. The spraying distance is 80mm, the current is 600A, and the spraying pressure is 60V. The crystal st...

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Abstract

The invention provides a preparation method of a thermal carrier coating and the thermal barrier coating prepared through the preparation method. According to the preparation method, a precursor solution prepared from zircon salt and ytterbium salt is used as a spraying raw material, and in a liquid-phase plasma spraying device, the precursor solution is delivered into plasma jet flow through a two-flow atomization nozzle and then deposits on a matrix to form the thermal barrier coating provided with evenly-distributed pores and vertical crack structures. The thermal barrier coating prepared through the method is a nano-structure thermal barrier coating provided with vertically-cracked columnar crystals and the evenly-distributed pores. According to the preparation method of the thermal carrier coating and the thermal barrier coating prepared through the preparation method, the precursor solution replaces agglomeration powder to serve as the raw material, so that a complex traditionalraw material pelletizing process based atmosphere plasma spraying is greatly simplified, the production efficiency is improved, and the cost is reduced. The structure of the coating is controllable, and the thermal barrier coating prepared through the preparation method is of a nano-structure and is provided with vertical crack structures. A ceramic material YbSZ has high phase stability and low thermal conductivity.

Description

technical field [0001] The invention relates to a thermal barrier coating material. In particular, it relates to a preparation method of a thermal barrier coating which uses a solution precursor instead of agglomerated powder in a conventional plasma spraying process and the thermal barrier coating. Background technique [0002] With the development of aviation gas turbine engines in the direction of high flow ratio and high thrust-to-weight ratio, the inlet temperature of the turbine engine will further increase, thereby improving engine efficiency. Existing metal materials used alone can no longer meet the design and use requirements. Thermal barrier coatings (TBCs) use the superior high temperature resistance, corrosion resistance and low thermal conductivity of ceramic materials to combine ceramics and metal substrates in the form of coatings to enhance the high temperature oxidation resistance and resistance of hot end parts. Corrosion ability, a surface protection te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11
Inventor 王瑞叶福兴米鹏博赵洪舰郭磊
Owner TIANJIN UNIV
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