Strength and integrity of ceramic coatings

Pertti Auerkari; Pentti Kauppinen; Kari Santaoja; Tero Uuttu

Strength and integrity of ceramic coatings

Pertti Auerkari, Pentti Kauppinen, Kari Santaoja, Tero Uuttu

Research output: Book/Report › Report

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 language	English
Place of Publication	Espoo
Publisher	VTT Technical Research Centre of Finland
Number of pages	18
ISBN (Print)	951-38-3982-6
Publication status	Published - 1991
MoE publication type	D4 Published development or research report or study

Publication series

Series	Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
Number	734
ISSN	0358-5077

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

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Cite this

Auerkari, P., Kauppinen, P., Santaoja, K., & Uuttu, T. (1991). Strength and integrity of ceramic coatings. VTT Technical Research Centre of Finland. 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",

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",

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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 -