Strength and integrity of ceramic coatings

Pertti Auerkari, Pentti Kauppinen, Kari Santaoja, Tero Uuttu

    Research output: Book/ReportReport


    The stiffness, stresses and integrity of structures with porous ceramic coatings have been considered in bending. The performance in comparison with that of bulk ceramic material, the failure criteria as well as appropriate testing methods are discussed. A consequence of the low stiffness of porous ceramic layers is that the Young's modulus and elastic stresses are rarely obtained with sufficient accuracy from bending tests. Ultrasonic testing appears to provide a convenient and nondestructive way of assessing Young's modulus, with the possible additional advantage of information on anisotropy. Ultrasonic testing in C-scan mode is also sensitive to defects originating and developing in the coating. The fracture toughness of a natural granite in the weakest orientation was shown to be 1.2 ± 0.05 MPa square root m, or about half of the typical reported values at random orientation.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages18
    ISBN (Print)951-38-3982-6
    Publication statusPublished - 1991
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports


    • porous materials
    • ceramics
    • ceramic coatings
    • materials tests
    • mechanical tests
    • mechanical properties
    • bending
    • bend tests
    • bend properties
    • stiffnes
    • stresses
    • test methods
    • nondestructive tests
    • ultrasonic tests
    • modulus of elasticity
    • failure
    • defects
    • anisotropy
    • aluminum oxide
    • granite


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