Strength and integrity of ceramic coatings

Pertti Auerkari, Pentti Kauppinen, Kari Santaoja, Tero Uuttu

    Research output: Book/ReportReport

    Abstract

    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
    Number734
    ISSN0358-5077

    Fingerprint

    ceramic coatings
    integrity
    stiffness
    modulus of elasticity
    ultrasonics
    ceramics
    granite
    fracture strength
    coatings
    anisotropy
    defects

    Keywords

    • 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

    Cite this

    Auerkari, P., Kauppinen, P., Santaoja, K., & Uuttu, T. (1991). Strength and integrity of ceramic coatings. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 734
    Auerkari, Pertti ; Kauppinen, Pentti ; Santaoja, Kari ; Uuttu, Tero. / Strength and integrity of ceramic coatings. Espoo : VTT Technical Research Centre of Finland, 1991. 18 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 734).
    @book{54d43836f31245eea9f9e1c59e9841bb,
    title = "Strength and integrity of ceramic coatings",
    abstract = "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.",
    keywords = "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",
    author = "Pertti Auerkari and Pentti Kauppinen and Kari Santaoja and Tero Uuttu",
    year = "1991",
    language = "English",
    isbn = "951-38-3982-6",
    series = "Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports",
    publisher = "VTT Technical Research Centre of Finland",
    number = "734",
    address = "Finland",

    }

    Auerkari, P, Kauppinen, P, Santaoja, K & Uuttu, T 1991, Strength and integrity of ceramic coatings. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 734, VTT Technical Research Centre of Finland, Espoo.

    Strength and integrity of ceramic coatings. / Auerkari, Pertti; Kauppinen, Pentti; Santaoja, Kari; Uuttu, Tero.

    Espoo : VTT Technical Research Centre of Finland, 1991. 18 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 734).

    Research output: Book/ReportReport

    TY - BOOK

    T1 - Strength and integrity of ceramic coatings

    AU - Auerkari, Pertti

    AU - Kauppinen, Pentti

    AU - Santaoja, Kari

    AU - Uuttu, Tero

    PY - 1991

    Y1 - 1991

    N2 - 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.

    AB - 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.

    KW - porous materials

    KW - ceramics

    KW - ceramic coatings

    KW - materials tests

    KW - mechanical tests

    KW - mechanical properties

    KW - bending

    KW - bend tests

    KW - bend properties

    KW - stiffnes

    KW - stresses

    KW - test methods

    KW - nondestructive tests

    KW - ultrasonic tests

    KW - modulus of elasticity

    KW - failure

    KW - defects

    KW - anisotropy

    KW - aluminum oxide

    KW - granite

    M3 - Report

    SN - 951-38-3982-6

    T3 - Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports

    BT - Strength and integrity of ceramic coatings

    PB - VTT Technical Research Centre of Finland

    CY - Espoo

    ER -

    Auerkari P, Kauppinen P, Santaoja K, Uuttu T. Strength and integrity of ceramic coatings. Espoo: VTT Technical Research Centre of Finland, 1991. 18 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 734).