Strength and integrity of ceramic coatings

Pertti Auerkari, Pentti Kauppinen, Kari Santaoja, Tero Uuttu

Research output: Book/ReportReportProfessional

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

NameTutkimuksia / Valtion teknillinen tutkimuskeskus
PublisherVTT
Volume734
ISSN (Print)0358-5077

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).
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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",
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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/ReportReportProfessional

TY - BOOK

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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

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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 - Tutkimuksia / Valtion teknillinen tutkimuskeskus

BT - Strength and integrity of ceramic coatings

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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).