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Showing 1 to 8 of 8 for “"NiCoCrAlY"”.
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Interdiffusion Analysis For Nicocraly And Nial Vs. Various Superalloys
Hot section components in gas turbines can be NiCoCrAlY-coated to provide the component with an Al reservoir that maintains a protective oxide layer on its surface. Over the service life of the component, the coatings degrade by composition and phase changes due to oxidation/hot-corrosion, and …
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Failure mechanisms of thermal barrier coatings for high temperature gas turbine components under cyclic thermal loading
… systems: a single phase (Ni,Pt)-aluminide and a NiCoCrAlY overlay layer in the case of the EB-PVD and APS TBC respectively. The degradation of APS TBCs, i.e. crack evolution and oxidation kinetics during isothermal and thermal cyclic loading were systematically monitored and analyzed by means of …
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Effects Of Bond Coat Surface Preparation On Thermal Cycling Lifetime And Failure Characteristics Of Thermal Barrier Coatings
… the effects of surface modification for the NiCoCrAlY bond coats on the thermal cycling lifetime and failure characteristics of TBCs. Parameters of modification for the bond coats included as-sprayed, barrel-finished, hand-polished and pre-oxidation heat treatment at 1100[degrees]C in …
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Ni-Al-Ta alloys for high temperature abrasive coatings
… nitride (cBN) abrasive particles embedded in a NiCoCrAlY anchor phase. Previous work has shown that at the operating temperatures achieved in the high-pressure turbine, the NiCoCrAlY is unable to retain the embedded cBN particles under abrasion. A new anchor phase system based on the …
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The effect of bond coat oxidation on the microstructure and endurance of two thermal barrier coating systems
… of a CMSX-4 nickel-based superalloy substrate, NiCoCrAlY overlay bond coat applied by two different techniques and a yttria stabilised zirconia topcoat applied by electron beam physical vapour deposition (EBPVD). The bond coats were applied by either high velocity oxy-fuel spraying (HVOF) or …
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Ermittlung des Verformungs- und Schädigungsverhaltens von Wärmedämmschichtsystemen
… zirconium oxide; a bond coat (BC) layer of NiCoCrAlY (balance Ni, 21.1%Co, 17.1%Cr, 12.6%Al, 0.61%Y, 0.4%Hf) that also acts as a corrosion protection; and a substrate of the polycrystalline turbine blade alloy IN 792 CC or the single crystalline CMSX-4. For the isothermal low cycle fatigue …
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Effect of thermal and mechanical loadings on the degradation and failure modes of APS TBCs
… stabilized zirconia (ZrO2-7-8wt.%Y2O3) with a NiCoCrAlY bond coat onto a CMSX-4 substrate and was subjected to six types of tests: (i) isothermal furnace tests, (ii) thermal cycling, (iii) cyclic oxidation, (iv) cyclic oxidation with temperature gradient, (v) thermomechanical fatigue, (vi) …
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Nondestructive Evaluation Of Thermal Barrier Coatings With Thermal Wave Imaging And Photostimulated Luminescence Spectroscopy
… of air plasma sprayed ZrO2 - 7wt.% Y2O3 on NiCoCrAlY bond coats with Haynes 230 superalloy substrate. As-coated specimens of varying thicknesses were evaluated by TWI to examine its applicability as a thickness measurement tool. It was found that heat dissipation through the TBC following …