Thermal barrier coating for single crystal superalloy thermal protection and preparation method thereof

A technology of superalloy and thermal barrier coating, applied in metal material coating process, coating, metal processing equipment, etc., can solve the problem of easily damaged ceramic barrier layer, the roughness of ceramic barrier layer cannot meet the preparation requirements of spray coating, etc. problem, to achieve the effect of ensuring the interface bonding performance and avoiding recrystallization

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Problems solved by technology

However, when the ceramic barrier layer is directly applied between the bonding layer and the substrate prepared by the thermal spraying process, in the thermal spraying process, the high-speed flying powder particles are easy to damage the ceramic barrier layer while hitting the deposited ceramic barrier layer. barrier layer
At the same time, the roughness of the ceramic barrier layer cannot meet the preparation requirements of spray coatings

Method used

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  • Thermal barrier coating for single crystal superalloy thermal protection and preparation method thereof
  • Thermal barrier coating for single crystal superalloy thermal protection and preparation method thereof
  • Thermal barrier coating for single crystal superalloy thermal protection and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0036] Step 1. Select the wafer sample of wire-cut nickel-based single crystal superalloy DD33 as the substrate 1, and use sandpaper and polishing paste to grind the substrate 1 to remove the heat-affected zone on the surface of the substrate 1. The thickness of the grinding off is about 200μm;

[0037] Step 2. Using arc ion plating equipment to prepare a TiN barrier layer 2 with a thickness of 2 μm on the surface of the substrate 1; wherein, the target material is a Ti target with a purity >99.9%, and the gases used in the experiment are argon and nitrogen with a purity of 99.999%. The deposition temperature is 450°C, the pressure is 1Pa, the current is 90A, and the bias voltage is -100V;

[0038] Step 3. Using arc ion plating equipment to prepare a NiCoCrAlYHf coating with a thickness of 50 μm on the barrier layer 2 as the lower bonding layer 3a, the measured surface roughness Ra of the lower bonding layer 3a is (1.63±0.2) μm; wherein, The deposition temperature when prepar...

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Abstract

The invention relates to a thermal barrier coating for single crystal superalloy thermal protection and a preparation method thereof, and belongs to the technical field of material thermal protection.The thermal barrier coating adopts single crystal superalloy as a substrate, a thermal barrier layer formed by sequentially stacking a barrier layer, a lower bonding layer prepared through a vapor deposition process, an upper bonding layer prepared thruogh a thermal spraying process, and a ceramic layer is arranged on the substrate, through the barrier coating, interdiffusion of elements betweenthe substrate and the bonding layers can be suppressed, and recrystallization of the single crystal superalloy substrate caused by a sandblasting process is avoided. The preparation process of the thermal barrier coating mature processes, operation is simple, and large-scale production can be achieved easily.

Description

technical field [0001] The invention relates to a thermal barrier coating for thermal protection of a single crystal superalloy and a preparation method thereof, belonging to the technical field of material thermal protection. Background technique [0002] Thermal barrier coating technology is one of the key technologies to ensure the performance of hot-end components of aero-engines and ground gas turbines, and its pros and cons directly affect the overall performance of hot-end components. Thermal barrier coatings usually have a double-layer structure consisting of a ceramic layer and a metal bonding layer, in which the ceramic layer is mainly used for heat insulation, and the metal bonding layer is used to alleviate the thermal expansion coefficient mismatch between the ceramic layer and the substrate, and provide a coating layer. The role of high temperature oxidation resistance and corrosion resistance. MCrAlY (M is Ni, Co or NiCo) bonding layer has become one of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/32C23C14/35C23C14/18C23C14/06C23C14/58C23C4/129C23C4/134C23C4/073C23C4/08C23C4/10B24C1/06B24C11/00B24C7/00
CPCB24C1/06B24C7/0061B24C11/00C23C4/073C23C4/08C23C4/10C23C4/129C23C4/134C23C14/06C23C14/18C23C14/32C23C14/35C23C14/5806
Inventor 王全胜王皓宁先进
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