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Oxidation resistance of plasma sprayed thermal barrier coatings

  • Categories:Industry News
  • Author:plasma cleaning machine-surface treatment equipment-CRF plasma machine-Sing Fung Intelligent Manufacturing
  • Origin:
  • Time of issue:2021-03-06
  • Views:

(Summary description)With the development of aviation industry, the inlet temperature and efficiency of turbine engine gas are constantly improving, but the existing superalloy and cooling technology can not meet this demand. Therefore, the application of plasma sprayed thermal barrier coating on the surface of superalloy is particularly important, and thermal barrier coating has a long history of working at high temperature. Antioxidant capacity is an important index to evaluate the properties of plasma sprayed thermal barrier coatings. The thermodynamic and kinetic analysis of high temperature oxidation behavior of plasma sprayed thermal barrier coatings was carried out by using the method of weighing and oxide layer thickness. The composition distribution and structure changes of the samples were studied by means of X-ray diffraction and electron probe. The oxidation mechanism of thermal barrier coating was discussed based on the experimental results. The static oxidation performance of ZrO2 thermal barrier coating prepared by atmospheric plasma machine spraying was tested by using MgO and Y2O3 as stabilizers. It was found that the static oxidation kinetics of the two thermal barrier coatings followed a parabolic rule, and the porosity decreased with the increase of oxidation temperature, while the monocline content increased. Although the MgO content is higher than that of Y2O3, the Y2O3-stabilized ZrO2 thermal barrier coating has better thermal stability. However, in the Y2O3 stabilized ZrO2 thermal barrier coating, Al element is uniformly distributed on the transition layer and has good oxidation resistance. The Y2O3-ZrO2/NiCoCrAlY composite thermal barrier coating was prepared by low pressure plasma spraying technology, and the static oxidation test was carried out at 800-1000℃. The thermal barrier coating has good high temperature oxidation resistance by spraying the adhesive layer by low pressure plasma processor. Moreover, after the sample is oxidized for a long time at a high temperature, the aluminum element in the binder layer will diffuse to the interface between the ceramic layer and the binder layer, forming a uniform and dense double alumina film, which can protect the matrix more effectively. Research on three kinds of high temperature oxidation behavior of thermal barrier coating showed that plasma oxidation process of thermal barrier coating can be divided into oxygen absorption, diffusion of oxygen in the ceramic layer, selective oxidation Al2O3 film, film growth, thick film and thick film destroyed six stages, including the distribution of aluminum directly affect the growth of the protective film and mature, will affect the oxidation resistance of the coating.

Oxidation resistance of plasma sprayed thermal barrier coatings

(Summary description)With the development of aviation industry, the inlet temperature and efficiency of turbine engine gas are constantly improving, but the existing superalloy and cooling technology can not meet this demand. Therefore, the application of plasma sprayed thermal barrier coating on the surface of superalloy is particularly important, and thermal barrier coating has a long history of working at high temperature.


Antioxidant capacity is an important index to evaluate the properties of plasma sprayed thermal barrier coatings. The thermodynamic and kinetic analysis of high temperature oxidation behavior of plasma sprayed thermal barrier coatings was carried out by using the method of weighing and oxide layer thickness. The composition distribution and structure changes of the samples were studied by means of X-ray diffraction and electron probe. The oxidation mechanism of thermal barrier coating was discussed based on the experimental results. The static oxidation performance of ZrO2 thermal barrier coating prepared by atmospheric plasma machine spraying was tested by using MgO and Y2O3 as stabilizers. It was found that the static oxidation kinetics of the two thermal barrier coatings followed a parabolic rule, and the porosity decreased with the increase of oxidation temperature, while the monocline content increased. Although the MgO content is higher than that of Y2O3, the Y2O3-stabilized ZrO2 thermal barrier coating has better thermal stability. However, in the Y2O3 stabilized ZrO2 thermal barrier coating, Al element is uniformly distributed on the transition layer and has good oxidation resistance. The Y2O3-ZrO2/NiCoCrAlY composite thermal barrier coating was prepared by low pressure plasma spraying technology, and the static oxidation test was carried out at 800-1000℃.


The thermal barrier coating has good high temperature oxidation resistance by spraying the adhesive layer by low pressure plasma processor. Moreover, after the sample is oxidized for a long time at a high temperature, the aluminum element in the binder layer will diffuse to the interface between the ceramic layer and the binder layer, forming a uniform and dense double alumina film, which can protect the matrix more effectively. Research on three kinds of high temperature oxidation behavior of thermal barrier coating showed that plasma oxidation process of thermal barrier coating can be divided into oxygen absorption, diffusion of oxygen in the ceramic layer, selective oxidation Al2O3 film, film growth, thick film and thick film destroyed six stages, including the distribution of aluminum directly affect the growth of the protective film and mature, will affect the oxidation resistance of the coating.

  • Categories:Industry News
  • Author:plasma cleaning machine-surface treatment equipment-CRF plasma machine-Sing Fung Intelligent Manufacturing
  • Origin:
  • Time of issue:2021-03-06 10:39
  • Views:
Information

Oxidation resistance of plasma sprayed thermal barrier coatings:
With the development of aviation industry, the inlet temperature and efficiency of turbine engine gas are constantly improving, but the existing superalloy and cooling technology can not meet this demand. Therefore, the application of plasma sprayed thermal barrier coating on the surface of superalloy is particularly important, and thermal barrier coating has a long history of working at high temperature.

CRF plasma
Antioxidant capacity is an important index to evaluate the properties of plasma sprayed thermal barrier coatings. The thermodynamic and kinetic analysis of high temperature oxidation behavior of plasma sprayed thermal barrier coatings was carried out by using the method of weighing and oxide layer thickness. The composition distribution and structure changes of the samples were studied by means of X-ray diffraction and electron probe. The oxidation mechanism of thermal barrier coating was discussed based on the experimental results. The static oxidation performance of ZrO2 thermal barrier coating prepared by atmospheric plasma machine spraying was tested by using MgO and Y2O3 as stabilizers. It was found that the static oxidation kinetics of the two thermal barrier coatings followed a parabolic rule, and the porosity decreased with the increase of oxidation temperature, while the monocline content increased. Although the MgO content is higher than that of Y2O3, the Y2O3-stabilized ZrO2 thermal barrier coating has better thermal stability. However, in the Y2O3 stabilized ZrO2 thermal barrier coating, Al element is uniformly distributed on the transition layer and has good oxidation resistance. The Y2O3-ZrO2/NiCoCrAlY composite thermal barrier coating was prepared by low pressure plasma spraying technology, and the static oxidation test was carried out at 800-1000℃.


The thermal barrier coating has good high temperature oxidation resistance by spraying the adhesive layer by low pressure plasma processor. Moreover, after the sample is oxidized for a long time at a high temperature, the aluminum element in the binder layer will diffuse to the interface between the ceramic layer and the binder layer, forming a uniform and dense double alumina film, which can protect the matrix more effectively. Research on three kinds of high temperature oxidation behavior of thermal barrier coating showed that plasma oxidation process of thermal barrier coating can be divided into oxygen absorption, diffusion of oxygen in the ceramic layer, selective oxidation Al2O3 film, film growth, thick film and thick film destroyed six stages, including the distribution of aluminum directly affect the growth of the protective film and mature, will affect the oxidation resistance of the coating.

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