Nanoindentation and tribology of ZrB2 based luminescent ceramics. Issue 14 (November 2020)

• Record Type: Journal Article
• Authors: Ivor, Michal; Medved, David; Vojtko, Marek; Naughton-Duszova, Annamaria; Marciniak, Lukasz; Dusza, Jan
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 14(2020)
• Page Start: 4901
• Page End: 4908
• Publication Date: 2020-11
• Subjects: ZrB2+Al2O3:Cr3+, Nd3+ -- Luminescent ceramic -- Nano-indentation -- Tribology; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.03.021
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Nano-mechanical and wear characteristics of ZrB2 + Al2 O3 :Cr 3+, Nd 3+ (Al2 O3 co-doped with Cr 3+ and Nd 3+ ions) luminescent ceramic composites have been investigated using nanoindentation and tribological tests. Nanoindentation was carried out using a Berkovich diamond tip applying continuous stiffness measuring (CSM) mode with a maximum depth of 200 nm. The wear behaviour was studied during dry sliding in the air with a SiC counter body at applied loads of 5 and 50 N, and sliding speed of 0.1 m/s. The nanohardness of the ZrB2 and Al2 O3 are very similar with mean values of 34.2 GPa and 32.6 GPa, respectively The Young modulus for ZrB2 is higher with a mean value of 555.6 GPa in comparison to the Young modulus of alumina with mean value of 473.8 GPa. Pop – in effect was found during the indentation of ZrB2 grains at indentation loads from 0.2–8.0 mN. The lowest coefficient of friction was measured for ZrB2 + 8%Al2 O3 :Cr 3+, Nd 3+ at 5 N load with value of approximately 0.5. The wear rate of the system ZrB2 + 32 % Al2 O3 :Cr 3+, Nd 3+ at 5 N is significantly lower in comparison to the wear rate of ZrB2 + 8% Al2 O3 :Cr 3+, Nd 3+ but at a load of 50 N the wear of the systems is very similar approximately 1. 10 −5 mm 3 /N.m. Tribolayer formation connected with debris origin, oxidation and tribochemical reactions were characteristic for both composites with similar chemical composition but different size and thickness of tribolayers.