Coefficient of friction and wear resistance of zirconia-MWCNTs composites

Validerad; 2014; Nivå 2; 20140910 (andbra)
Composites of 3 mol.% yttria-doped tetragonal zirconia (3Y-TZP) reinforced with multiwalled carbon nanotubes (MWCNT) up to 2 wt. % content have been produced using spark plasma sintering (SPS). The theoretical densities of the studied composites were found to be between 99.4 and 97.4%. The addition of MWCNT content resulted in reduction of 3Y-TZP grain size from 174 to 148 nm. The effect of MWCNT on the friction coefficient (COF) was studied by performing nano- and macro-scratches using diamond Berkovich and Rockwell indenters, respectively. Moreover, the COF and the wear rate were also investigated in reciprocating sliding against a zirconia ball under a load of 5 N. The results showed that the COF decreased upon the increase in MWCNT content. However, in macro-scratch testing, there was a critical load over which brittle fracture sets in and its value decreases as the MWCNT content increases. The wear resistance was found to be decreasing very slightly for less than 1 wt. % MWCNT, while it increases strongly for the addition of 2 wt. % MWCNT under the conditions studied. The results were discussed in terms of material properties, scanning electron microscopy observations of the wear track and nanoindentation tests.

Rovira, Joan Josep RoaDepartment of Materials Science and Engineering, Universitat Politècnica de Catalunya, Barcelona (author)
Antti, Marta-LenaLuleå tekniska universitet,Materialvetenskap(Swepub:ltu)marta (author)
Anglada, MarcDepartment of Materials Science and Engineering, Universitat Politècnica de Catalunya, Barcelona (author)
Luleå tekniska universitetMaterialvetenskap (creator_code:org_t)

By the author/editor: Melk, Latifa; Rovira, Joan Jos ...; Antti, Marta-Len ...; Anglada, Marc

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Other Materials ...

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