Articles written in Sadhana

    • A comparative study of erosion wear rate of conventional and nonconventional thermal barrier coatings on IN800 superalloys


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      Air plasma sprayed (APS) 7weight percent yttria stabilized zirconia (7YSZ) typical thermal barrier coatings are commonly used in aero engine components to protect against thermal fatigue, corrosion, erosion, corrosion-erosion and oxidation phenomenon. In spite of extensive industrial application of 7YSZ coatings, very few works are there on erosion wear performance and its mechanisms on these coatings. In the present work, comparative inspection of the erosion wear behaviors of air plasma sprayed 7YSZ thermal barrier coatings and dip-coated sol-gel processed 7YSZ thermal barrier coatings are carried out. For the sake of comparison erosion of uncoated Inconel 800 superalloys substrate was also studied. Erosion tests were conducted on air jet erosionconditions with alumina erodent materials and process parameters determined as per Taguchi design of experiments at room and high temperature of 850˚C. Erosion wear resistance of non-conventional dip-coating of sol-gel derived 7YSZTBC was found better in comparison to conventional APS YSZ coatings.

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