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Crack-Healing Function of Nano-Ni/(ZrO2+Al2O3) Hybrid Materials

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Abstract:

Ni/(ZrO2+Al2O3) nanocomposites have excellent mechanical properties, as well as self-healing function. The powder preparation was conducted by drying slurry consisting of distilled water, Al2O3, 3 mol % Y2O3 doped ZrO2 and nickel nitrate. After reduction at 600°C in a stream of Ar-1% H2, the powder mixture was consolidated by pulsed electric current sintering (PECS) at 1300°C for 5 min under 50 MPa. Surface cracks were generated by Vickers indentation on the polished surface of the test samples. Ni/(YZ+Al2O3) shows 1200 MPa in bending strength and 6.1 MPa m1/2 in facture toughness. Crack-healing and oxidation tests were conducted at temperature ranging from 1100 to 1300°C in air. As a result, crack-disappearance occurred slightly faster than that of Ni/Al2O3.

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Periodical:

Materials Science Forum (Volume 804)

Pages:

179-182

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.804.179

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Online since:

October 2014

Authors:

Hai Vu Pham*, Makoto Nanko

Keywords:

Al2O3, High-Temperature Oxidation, Nanocomposite, Self-Healing, Zro2

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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