Abstract
| 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
| Name | Tutkimuksia / Valtion teknillinen tutkimuskeskus |
|---|---|
| Publisher | VTT |
| Volume | 734 |
| ISSN (Print) | 0358-5077 |
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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
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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/Report › Report › Professional
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 - Tutkimuksia / Valtion teknillinen tutkimuskeskus
BT - Strength and integrity of ceramic coatings
PB - VTT Technical Research Centre of Finland
CY - Espoo
ER -