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TiAl based alloy type thermal barrier coating and preparation method thereof

A thermal barrier coating and base alloy technology, applied in metal material coating process, coating, superimposed layer plating and other directions, can solve problems such as reducing room temperature processing ability, improve the ability to resist easy sintering, ensure high temperature performance, the effect of improving high temperature strength and oxidation resistance

Active Publication Date: 2018-08-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Regarding improving the high-temperature oxidation protection of TiAl-based alloys, alloying and coating protection are mainly considered. Adding Nb to TiAl-based alloys forms intermetallic compounds to improve its high-temperature strength and oxidation resistance. The addition of high-melting-point component Nb increases the melting point of the alloy. The TiAl-based alloy can be used above 900 °C, but high niobium alloying reduces its room temperature processing ability

Method used

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  • TiAl based alloy type thermal barrier coating and preparation method thereof
  • TiAl based alloy type thermal barrier coating and preparation method thereof
  • TiAl based alloy type thermal barrier coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition of the TiAl-based alloy is (wt.%): 43Ti, 49Al, 0.3Si, 4.2Mo, 3Nb, 0.5Ni, and the size is 100mm×20mm×10mm. Sanding the substrate and 220 grit Al 2 o 3 Sandblasting, then cleaning with ethanol, and then place the annealing furnace to preheat to 50°C.

[0026] The composition of the cladding material (MCrAlY+Ti+Nb+Zr) is (wt.%): 32Co, 38Cr, 18Ti, 10Al, 0.8Y, 0.2Si, 0.5Nb, 0.5Zr.

[0027] Place the preheated TiAl-based alloy in a GS-TFL6000 CO 2 The laser cladding processing area of ​​the laser uses the GS-TFL synchronous powder feeder to convey the cladding material synchronously. The process parameters of laser cladding are as follows: defocus (the vertical distance from the cladding surface of the substrate to the focus of the beam) is 60mm, the spot diameter is about 4mm, the protective gas is argon, and the argon flow rate is 25L h -1 , the laser power is 4kW, and the scanning speed is 360mm·min -1 , synchronous powder feeding rate 100g·min -1 . ...

Embodiment 2

[0034] The composition of the TiAl-based alloy is (wt.%): 45Ti, 47Al, 0.2Si, 5.5Mo, 2Nb, 0.3Co, and the size is 100mm×20mm×10mm. Sanding the substrate and 220 grit Al 2 o 3 Sand blasting, then cleaning with ethanol, and then place the annealing furnace to preheat to 100°C.

[0035] The composition of the cladding material (MCrAlY+Ti+Nb+Zr) is (wt.%): 38Ni, 40Cr, 10Ti, 8Al, 0.7Y, 1.8Si, 0.6Nb, 0.9Zr.

[0036] Place the preheated TiAl-based alloy in a GS-TFL6000 CO 2 The laser cladding processing area of ​​the laser uses the GS-TFL synchronous powder feeder to transport the cladding material synchronously. The process parameters of laser cladding are as follows: the defocus amount is 60mm, the spot diameter is about 4mm, the protective gas is argon, and the argon flow rate is 25L h -1 , the laser power is 4kW, and the scanning speed is 360mm·min -1 , synchronous powder feeding rate 100g·min -1 .

[0037] The obtained cladding layer is machined, and the cladding surface is...

Embodiment 3

[0043] The composition of the TiAl-based alloy is (wt.%): 44Ti, 50Al, 0.1Si, 3.9Mo, 1.8Nb, 0.2Co, and the size is 100mm×20mm×10mm. Sanding the substrate and 220 grit Al 2 o 3 Sand blasting, then cleaning with ethanol, and then place the annealing furnace to preheat to 200°C.

[0044] The composition of the cladding material (MCrAlY+Ti+Nb+Zr) is (wt.%): 15Co+15Ni, 47Cr, 15Ti, 5Al, 0.1Y, 1.2Si, 0.9Nb, 0.8Zr, and the size is controlled at about 50nm.

[0045] Place the preheated TiAl-based alloy in a GS-TFL6000 CO 2 The laser cladding processing area of ​​the laser uses the GS-TFL synchronous powder feeder to transport the cladding material synchronously. The process parameters of laser cladding are as follows: the defocus amount is 60mm, the spot diameter is about 4mm, the protective gas is argon, and the argon flow rate is 25L h -1 , the laser power is 4kW, and the scanning speed is 360mm·min -1 , synchronous powder feeding rate 100g·min -1 .

[0046] The obtained claddi...

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Abstract

The invention provides a TiAl based alloy type thermal barrier coating. The TiAl based alloy type thermal barrier coating comprises a TiAl based alloy, a cladding layer and a remelting layer, whereinthe cladding layer is MCrAlY alloy powder doped with Ti, Nb and Zr; the remelting layer is prepared by coating the surface of the cladding layer with mixed powder of Al2O3, ZrO2 and HfO2 and then remelting through laser. The TiAl based alloy type thermal barrier coating is prepared by the method integrating laser and supersonic spray; and the obtained coating is outstanding in high temperature performance, and a composite layer is closely combined.

Description

technical field [0001] The invention belongs to the field of manufacturing superalloy coatings, and relates to the research of laser processing and thermal spraying composite technology, in particular to a TiAl-based alloy thermal barrier coating and a preparation method thereof. Background technique [0002] In modern industry, in order to meet the requirements of high-temperature service conditions such as aero-engines and industrial gas turbines, high-temperature protective coatings must not only have high-temperature oxidation resistance and corrosion resistance, but also have a stable structure and a good combination with the substrate. TiAl-based alloys have the advantages of high specific stiffness and high specific strength, but there are some problems that hinder the industrial application and promotion of TiAl-based alloys, mainly room temperature brittleness and high temperature oxidation resistance. For its room temperature brittleness, it is generally solved by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C30/00C22C21/00C23C4/129C23C4/11C23C4/18C23C28/00
CPCC22C21/003C22C30/00C23C4/11C23C4/129C23C4/18C23C24/103C23C28/321C23C28/345
Inventor 陈亮维全琪刘子峰李平安易健宏
Owner KUNMING UNIV OF SCI & TECH
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