Abstract
The application of metal-matrix composite coatings for protecting and improving the service life of sliding components has demonstrated to have the potential of meeting the requirements of a diverse range of engineering industries. Recently, a significant body of research has been devoted to studying the mechanical and tribological performance of dispersion-strengthened MCrAlY coatings. These coatings belong to a class of emerging wear-resistant materials, offering improved properties and being considered as promising candidates for the protection of engineering structural materials exposed to tribological damage, especially at elevated temperature regimes. This paper attempts to comprehensively review the different reinforcements used in the processing of MCrAlY-based alloys and how they influence the mechanical and tribological properties of the corresponding coatings. Furthermore, the major fabrication techniques together with their benefits and challenges are also reviewed. Discussion on the failure mechanisms of these coatings as well as the main determining factors are also included. In addition, a comprehensive survey of studies and investigations in recent times are summarized and elaborated to further substantiate the review.
Highlights
It is self-evident that the design and manufacturing strategy of specified materials are governed by their appropriate properties for the intended industrial applications
An appropriate technological of these methods include the flexibility of depositing a broad processing window high should be chosen with to the feedstock material properties range of materials, productivity andreference the capability of applying localized repairsand to recover the damaged components
Adhesion, fracture toughness, elastic modulus, and shear modulus are among the main mechanical properties of materials
Summary
It is self-evident that the design and manufacturing strategy of specified materials are governed by their appropriate properties for the intended industrial applications. A broad spectrum of different materials can be used as a coating and a wide array of deposition technologies are available Covering these issues is beyond the scope of this paper, which concerns itself with the dispersion-strengthened MCrAlY-based coatings developed for the tribological applications in demanding environments. TBCsasenables the enables the superalloys prevents their overheating in areas first stage use of superalloys and prevents their overheating in areas such as first stage blades and blades and vanes, where the gas temperatures are close to or above the service temperavanes, the gas temperatures ture of where these materials (T > 1000 °C)are [2].close to or above the service temperature of these materials (T > 1000 ◦ C) [2] In sections such as second stages of a gas turbine engine and compressor blades, In sections such as second stages of a gas turbine engine and compressor blades, which which experience temperatures lower than◦ 750 °C, an overlay coating can be used without experience temperatures lower than 750 C, an overlay coating can be used without the the need for the ceramic topcoat [3].
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