BALORA PVD MCrAlYThe next generation of high-density MCrAlY coatings using PVD Arc technology

Turbine Hot Section
Gas Turbine hot section

In order to improve the efficiency level of gas turbines, the operating temperatures are often increased to 1,200 °C and above. The coatings used in the hot section must withstand these extreme conditions to prevent hot corrosion and component oxidation, otherwise a system failure would occur – resulting in considerable replacement costs.

Typically, MCrAlY coatings are produced using thermal spraying and other technologies. Oerlikon Balzers has applied its proven high-end PVD Arc technology to make the standard MCrAlY coating production process more efficient and significantly improve the coating properties.

BALORA™ PVD MCrAlY offers superior properties compared to conventionally produced MCrAlY coatings: it has excellent substrate adhesion, and it can be applied up to a thickness of 100 micrometres without porosity. Most importantly, the MCrAlY composition in combination with the high density can be tailored to form the perfect barrier against oxidation on turbine blades and vanes.

  • Advantages





    Customer value

    Oxidation resistance

    Higher service temperatures


    Improved efficiency

    High density

    Excellent diffusion barrier, better control over diffusion processes


    Improved reliability of the turbine blades

    Low surface roughness

    Aerodynamically smooth surfaces at high temperatures


    Increased efficiency of turbine blades in power generation and aerospace

    Outstanding substrate adhesion

    Excellent atomic bonding adhesion on all turbine materials


    Durability and performance from protective coating

    Improved corrosion resistance

    The optimum coating composition combined with PVD technology prevents premature hot corrosion at high operating temperatures


    Extended turbine blade service life, reduced maintenance and longer service intervals

  • Specifications


    Coating material NiCrAlY (Ni, Ni/Co, Co)
    Coating structure Arc
    Coating colour grey
    Coating hardness HIT[GPa]* 7 - 11
    Max. service temp. [°C]**** 1200
    Coating temperature [°C] 400 - 500
    Typical coating thickness [µm] 0.1 to > 100
    General remark All given data are approximate values, they depend on application, environment and test condition.
    *Coating hardness HIT[GPa] Measured by nano indentation according to ISO 14577. For multilayers the hardness of the different layers varies.
    ****Max. service temp. [°C] These are approximate values out of the field. Due to thermodynamic laws there is a dependency of pressure in application.
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