An Effective Approach of Nanoscale CaF2 Addition into
ZTA Composite to Enhance Tribological Characteristics
in Dry Sliding |
Subhrojyoti Mazumder,1 Kishor Kumar Sadhu,2 Kunal Ghosh,1 Poulomi Roy1 and
Nilrudra Mandal1, *
Pages : 19-27
DOI : 10.1080/0371750X.2020.1863863 |
Abstract |
This work was carried out to establish a noble technique to enhance tribological
characteristics of zirconia toughened alumina (ZTA) ceramic composite by adding
10 wt% nano CaF2 (~50 nm) via chemical co-precipitation method. Result of the
tribological tests, carried out using ball-on-disk tribo-pair in dry sliding, showed a
considerable improvement in coefficient of friction up to ~55% and the wear rate
~35% in CaF2/ZTA composite as compared to pure ZTA composite fabricated via
chemical processing route followed by hot pressing. In the later stage, a similar
CaF2/ZTA ceramic composite was fabricated by traditional physical mixing process
of commercial CaF2 and ZTA powders followed by hot pressing using the same
parameters and the tribological performances were compared. The specimen
fabricated via chemical route possessed better responses in terms of tribo-mechanical
behaviors as compared to the specimen fabricated via traditional mixing. Various
phases of the composites were examined by X-ray diffraction. Elemental distribution
and the worn surface were characterized by energy dispersive X-ray analysis and
field emission scanning electron microscopy, respectively.
[Keywords: Nano CaF2/ZTA synthesis, Powder mixing, Tribological characterization,
Mechanical characterization] |
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