Structural and mechanical properties of graded composite Al2O3/Ni obtained from slurry of different solid content

Justyna Zygmuntowicz , Aleksandra Miazga , Katarzyna Konopka , Waldemar Kaszuwara

Abstract

In this work, an alumina-nickel graded hollow cylinders were prepared by the centrifugal slip casting. In the paper, the results for samples formed from slurries with different solid content: 45 vol.%, 40 vol.% and 35 vol.% are presented. The structure of the samples after sintering was examined by X-ray diffraction (XRD). The microstructure of the composite, especially the nickel particle size distributions were investigated by using scanning electron microscopy (SEM). An image analyzer has been used for the measurement of volume fraction of the nickel particles in the composites. The hardness was measured by using a Vickers hardness-testing. Based on hardness measurements KIC value were determined. The XRD results confirmed only two phases: Ni and α-Al2O3 in all samples. The preliminary macroscopic observation as well as SEM showed, that the microstructure of the sample cross-section is not homogeneous. Microstructural characterization revealed the gradation of nickel content along the radial direction of hollow cylinder. Three zones were distinguished, from outer surface towards the inner side of the tube. The maximum of volume fraction of nickel particles was obtained at the middle zone of the composites. The results of hardness-testing revealed that the maximum hardness values were observed in region at the inner edge of the casting due to an absence of nickel particles.
Author Justyna Zygmuntowicz ZMCP
Justyna Zygmuntowicz,,
- Division of Ceramic Materials and Polymers
, Aleksandra Miazga ZMCP
Aleksandra Miazga,,
- Division of Ceramic Materials and Polymers
, Katarzyna Konopka ZMCP
Katarzyna Konopka,,
- Division of Ceramic Materials and Polymers
, Waldemar Kaszuwara ZMKF
Waldemar Kaszuwara,,
- Division of Construction and Functional Materials
Journal seriesProcedia Structural Integrity, ISSN 2452-3216
Issue year2016
Vol1
Pages305-312
Publication size in sheets0.5
Keywords in EnglishFunctionally graded materials (FGM);Ceramic-Metal Composites;Microstructure;Microhardness
Languageen angielski
Score (nominal)5
ScoreMinisterial score = 0.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 5.0, 28-11-2017, ArticleFromJournal - czasopismo zagraniczne spoza list
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