Dynamic mechanical properties of ZrO2/NiCoCrAlY composite coatings

C. T. Chia; K. A. Khor; Y. W. Gu

doi:10.1016/S0040-6090(99)00694-X

Dynamic mechanical properties of ZrO₂/NiCoCrAlY composite coatings

C. T. Chia^*, K. A. Khor, Y. W. Gu

^*Corresponding author for this work

Nanyang Technological University

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

The dynamic mechanical analyzer (DMA) was utilized systematically to investigate the temperature dependence of the dynamic mechanical properties of as-sprayed ZrO₂/NiCoCrAlY composite coatings. The dynamic storage modulus of graded coatings varied in a graded and linear manner from 30-400 °C. An increase of modulus was observed for the 100 wt.% NiCoCrAlY and graded coatings at 400-650 °C, while 100 wt.% ZrO₂ coating exhibited linear behavior from 30-900 °C. This stress-induced and thermally activated structural relaxation of the coatings at 400-650 °C was attributed to the amorphous-to-crystalline transition of NiCoCrAlY phase. The relaxation effect responsible for the modulus increase is the diffusion of nickel atoms with activation energy of 248.3 kJ/mol and a frequency factor of 5.9×10¹⁶s^-1.

Original language	English
Pages (from-to)	139-145
Number of pages	7
Journal	Thin Solid Films
Volume	358
Issue number	1
DOIs	https://doi.org/10.1016/S0040-6090(99)00694-X
Publication status	Published - Jan 10 2000
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry

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title = "Dynamic mechanical properties of ZrO2/NiCoCrAlY composite coatings",

abstract = "The dynamic mechanical analyzer (DMA) was utilized systematically to investigate the temperature dependence of the dynamic mechanical properties of as-sprayed ZrO2/NiCoCrAlY composite coatings. The dynamic storage modulus of graded coatings varied in a graded and linear manner from 30-400 °C. An increase of modulus was observed for the 100 wt.% NiCoCrAlY and graded coatings at 400-650 °C, while 100 wt.% ZrO2 coating exhibited linear behavior from 30-900 °C. This stress-induced and thermally activated structural relaxation of the coatings at 400-650 °C was attributed to the amorphous-to-crystalline transition of NiCoCrAlY phase. The relaxation effect responsible for the modulus increase is the diffusion of nickel atoms with activation energy of 248.3 kJ/mol and a frequency factor of 5.9×1016s-1.",

author = "Chia, {C. T.} and Khor, {K. A.} and Gu, {Y. W.}",

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T1 - Dynamic mechanical properties of ZrO2/NiCoCrAlY composite coatings

AU - Chia, C. T.

AU - Khor, K. A.

AU - Gu, Y. W.

PY - 2000/1/10

Y1 - 2000/1/10

N2 - The dynamic mechanical analyzer (DMA) was utilized systematically to investigate the temperature dependence of the dynamic mechanical properties of as-sprayed ZrO2/NiCoCrAlY composite coatings. The dynamic storage modulus of graded coatings varied in a graded and linear manner from 30-400 °C. An increase of modulus was observed for the 100 wt.% NiCoCrAlY and graded coatings at 400-650 °C, while 100 wt.% ZrO2 coating exhibited linear behavior from 30-900 °C. This stress-induced and thermally activated structural relaxation of the coatings at 400-650 °C was attributed to the amorphous-to-crystalline transition of NiCoCrAlY phase. The relaxation effect responsible for the modulus increase is the diffusion of nickel atoms with activation energy of 248.3 kJ/mol and a frequency factor of 5.9×1016s-1.

AB - The dynamic mechanical analyzer (DMA) was utilized systematically to investigate the temperature dependence of the dynamic mechanical properties of as-sprayed ZrO2/NiCoCrAlY composite coatings. The dynamic storage modulus of graded coatings varied in a graded and linear manner from 30-400 °C. An increase of modulus was observed for the 100 wt.% NiCoCrAlY and graded coatings at 400-650 °C, while 100 wt.% ZrO2 coating exhibited linear behavior from 30-900 °C. This stress-induced and thermally activated structural relaxation of the coatings at 400-650 °C was attributed to the amorphous-to-crystalline transition of NiCoCrAlY phase. The relaxation effect responsible for the modulus increase is the diffusion of nickel atoms with activation energy of 248.3 kJ/mol and a frequency factor of 5.9×1016s-1.

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Dynamic mechanical properties of ZrO₂/NiCoCrAlY composite coatings

Abstract

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