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.

  • Avantages





    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

  • Spécifications


    Matériau de revêtement NiCrAlY (Ni, Ni/Co, Co)
    Structure du revêtement Arc
    Couleur du revêtement grey
    Dureté de couche HIT[GPa]* 7 - 11
    Temp. de service max. [°C]**** 1200
    Température de revêtement [°C] 400 - 500
    Épaisseur de couche typique [µm] 0.1 to > 100
    Remarque générale Toutes les valeurs spécifiées sont approximatives et dépendent de l'application, de l'environnement et des conditions d'essai.
    *Dureté de couche HIT[GPa] Mesuré par nanoindentation selon ISO 14577. Pour les revêtements multicouches, la dureté de chaque couche varie.
    ****Temp. de service max. [°C] Il s'agit de valeurs approximatives issues de la pratique. Les lois thermodynamiques induisent une dépendance de pression dans l'application.
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