High temperature oxidation behavior of aluminide coatings applied on HP-MA heat resistant steel using a gas-phase aluminizing process

Taghipour, M.; Eslami, A.; Bahrami, Abbas

doi:10.1016/j.surfcoat.2022.128181

Cited by 15 publications

(3 citation statements)

References 68 publications

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“…When heated to a given temperature, the aluminum in the infiltration agent reacts with the activator halide compound to form a volatile metal halide (AlCl n ). The gaseous halides diffuse to the alloy surface and further react to diffuse to form an aluminide coating [18]. Compared with low-activity aluminizing, gas-phase aluminizing adopts a non-contact method, which avoids the possibility of the dispersant particles in the aluminizing agent inserting into the coating during the aluminizing process, and maintains the cleanliness of the sample surface.…”

Section: Gas-phase Aluminizingmentioning

confidence: 99%

Research Status of Aluminum Base Coating on Titanium Alloy

Zeng,

2023

Coatings

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At present, in the aviation industry, titanium alloy is mainly used to manufacture parts such as compressor discs, blades, and the casings of aircraft engines. When titanium alloys are in service, high temperature is generated due to high-speed running friction, which requires them to have high-temperature oxidation resistance and friction resistance. If they are used in an environment with salt corrosion, titanium alloys will face thermal corrosion, which limits their wider practical applications. At present, there are many methods to protect titanium alloys. This paper mainly includes alumina-based coatings and some preparation methods. The characteristics and functional mechanisms of three functional coatings for the service environment, namely highly temperature-resistant alumina-based coating, thermal corrosion-resistant alumina-based coating, and wear-resistant alumina-based coating, are summarized. Finally, the development direction of composite coatings of titanium and titanium alloys for a complex service environment is suggested.

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Section: Gas-phase Aluminizingmentioning

confidence: 99%

Research Status of Aluminum Base Coating on Titanium Alloy

Zeng,

2023

Coatings

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“…Due to the presence of a significant amount of Cr in it, it protects the base material of the blade against oxidation and high-temperature corrosion. The advantages of the NiCoCrAlY layer are that it is possible to shape the content of aluminum and chromium and other elements in it and that its properties do not depend on the chemical composition of the blade material [22][23][24][25][26]. This layer is characterized by a low transition temperature from the brittle state to the plastic state, amounting to 473-573 K. The second layer, the outer one, was a diffusion thermal layer of the NiAl type with low thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…They found a significant improvement in the strength response of the MAR 247 nickel alloy by about 200 MPa during cyclic loading at 1173 K. They confirmed that the use of an aluminide layer can effectively protect the parent material against such processes as oxidation, corrosion, and wear. NiAl aluminide has a melting point of 1956 K [13,26]. The outer layer is intended for thermal protection against the high-temperature stream of aggressive fuel combustion products.…”

Section: Introductionmentioning

confidence: 99%

Two-Layer Heat-Resistant Protective Coatings for Turbine Engine Blades

Ułanowicz

Dudziński

2023

Coatings

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One of the most important factors for increasing the durability of turbine engines is the use of turbine blades characterized by the best possible convergence of the thermophysical properties of the protective coating and the base material of the blade. The aim of the research was to evaluate the heat resistance of prototype two-layer protective coatings applied to turbine blades. The inner layer of the coating enables shaping the thermophysical convergence of the coating and the base material of the blade. The outer layer is used for thermal protection of the blade material. The inner layer was applied to the blade by plasma spraying, and the outer layer was diffusion aluminized for the first type by a non-contact gas method, for the second type by a slurry method, and for the third type, the ceramics were plasma sprayed. Turbine blades with prototype coatings were subjected to an engine test, and after the test, macro- and microstructure tests were performed. The tests showed that the prototype protective coating with an inner layer of the MCrAlY type applied to the blade by plasma spraying and an outer layer aluminized by diffusion by a non-contact gas method protects the blade material against oxidation and ensures its thermal insulation.

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