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- Materials made of NiCrAlY provide oxidation resistance in high-temperature gas settings.
- Excellent resistance to hot corrosion is provided by CoCrAlY chemistry (sulfidation)
- Materials with a suitable balance of oxidation and sulfidation resistance include NiCoCrAlY or CoNiCrAlY.
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MCrAlY thermal spray coating
Where high-temperature oxidation and hot corrosion-resistant surface or bond coat required, MCrAlY thermal spray coating is recommended.
MCrAlY thermal spray coatings are used in the hottest sections of gas turbine engines and other high-temperature, corrosive environments. They can be used alone as an anti-corrosion coating or as a bond coat to improve the performance of Thermal Barrier Coating (TBC) systems or ceramic abradable coating systems.
MCrAlY Coatings are well established as an important technology for the manufacture of aero engine and industrial turbines. High turbine combustion temperatures are required for good engine efficiency and some environment reasons.
MCrAlY where M can be Co, Ni or Co/Ni. These coatings are widely used in first and second stage turbine blades and nozzle guide vanes, where they may be used as corrosion-resistant layers or as bond-coats for use with thermal barrier coatings(TBC).
In the first and second stage of a gas turbine, metal temperatures may exceed 850°C, and two predominant corrosion mechanisms are there
- Accelerated high-temperature oxidation (>950°C)
In the gaseous phase Reactions between the coating and oxidants produce oxides on the coating surface as well as internal penetration of oxides/sulphide within the coating, depending on the level of gas-phase contaminants.
- Hot corrosion (850 - 950°C)
From the vapour phase (from impurities in the fuel) Corrosion occurs through reaction with salts deposited. In this process, molten sulphates flux the oxide scales.
MCrAlY Powder Manufacturer
In MCrAlY coatings, The choice of base material M depends on the primary corrosion mechanism. Cr and Al are already in the MCrAlY composition because they form highly protective oxide scales, whilst Y promotes the formation of these stable oxides.
The core material (Co or Ni) selection is dependent on the primary corrosion mechanism, just as engine temperatures increase, the trend is towards CoNiCrAlY compositions. Cr and Al are already in the MCrAlY composition because they form highly tenacious protective oxide scales, whilst Y promotes the formation of these stable oxides.
MCrAlY coatings can be applied by these processes
- Physical vapour deposition
- High-velocity oxy-fuel coating
- Air plasma spraying