Thermal shock resistance of thermal barrier coatings for nickel-based superalloy by supersonic plasma spraying |
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| Affiliation: | 1. State Key Laboratory for Mechanical Behavior of Materials, Xi''an Jiaotong University, Xi''an 710049, PR China;2. State Key Laboratory for Manufacturing Systems Engineering, Xi''an Jiaotong University, Xi''an 710049, PR China;3. Department of Engineering Mechanics, Tsinghua University, Beijing 100084, PR China;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072, PR China;2. Advanced Materials Processing and Analysis Center, Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA;3. Materials Science Centre, School of Materials, University of Manchester, Grosvenor Street, Manchester, M13 9PL, UK;4. Department of Physics, University of the Punjab, Quaid-i-Azam Campus, Lahore, 54590, Pakistan;5. MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, School of Science, Xi′an Jiaotong University, Xi′an, Shaanxi, 710049, PR China |
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| Abstract: | Double-layer thermal barrier coatings (TBCs), including a top ZrO2 layer and an inner CoNiCrAlY layer, were deposited on nickel-based superalloy using supersonic atmospheric plasma spraying (SAPS). Thermal shock resistance of the TBCs between 1200 °C and room temperature was investigated. After thermal shock test, the adhesive strength of the coatings was evaluated through scratch test. The SAPS–TBCs present good thermal shock resistance, exhibiting only 0.26% mass gain up to 150-time thermal cycling. Before thermal cyclic treatment, SAPS–TBCs exhibited a strong adhesion with the absence of the thermally grown oxide (TGO) between out and inner layer. With the increasing of thermal cycles, the TGO layer was formed and its thickness firstly increased and then dropped down. The critical load fell down by about 32% for topcoat–bondcoat adhesion (up to 50 cycles) and 35% or so for TBCs–substrate adhesion (up to 150 cycles) compared to the counterpart of as-sprayed specimens. The strain introduced by the existence of TGO and mixed oxides resulted in a varied adhesion for TBCs on nickel-based alloy during thermal cycling. |
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| Keywords: | C Thermal shock resistance Thermal barrier coatings Supersonic atmospheric plasma spray Adhesion Thermally grown oxide |
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