OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

Hardness and friction behavior of bulk CoAl2O4 and Co–Al2O3 composite layers formed during Spark Plasma Sintering of CoAl2O4 powders

Pavia, Anthony and Laurent, Christophe and Weibel, Alicia and Peigney, Alain and Chevallier, Geoffroy and Estournès, Claude Hardness and friction behavior of bulk CoAl2O4 and Co–Al2O3 composite layers formed during Spark Plasma Sintering of CoAl2O4 powders. (2012) Ceramics International, 38 (6). 5209-5217. ISSN 0272-8842

[img]
Preview
(Document in English)

PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
2MB

Official URL: http://dx.doi.org/10.1016/j.ceramint.2012.03.028

Abstract

Materials made up of a Co–Al2O3 composite coating over a CoAl2O4 core are prepared during Spark Plasma Sintering of CoAl2O4 powders. The Co particles are precipitated because of a combination of high temperature and low O2 partial pressure. The precipitation and densification processes hamper each other and thus the way the uniaxial pressure is applied during the sintering cycle is an important parameter to control the microstructure of composite layer and its thickness (about 100 mm) and obtain a dense sample (about 4 g/cm3). The friction coefficient of the Co-Al2O3 composites against an Al2O3 ball is lower than that found for an Al2O3 specimen, which could reveal the lubricating role of submicrometer Co particles. However, increasing the load from 5 to 10 N load causes major changes in the friction contact, which are detrimental. Bulk CoAl2O4 was found to have a Vickers microhardness about 15.5 GPa and an average friction coefficient lower than that of an Al2O3 sample.

Item Type:Article
Additional Information:Thank to Elservier. The definitive version is available at http://www.sciencedirect.com/science/article/pii/S0272884212002441
HAL Id:hal-00836793
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
Statistics:download
Deposited By: cirimat webmestre
Deposited On:21 Jun 2013 13:14

Repository Staff Only: item control page