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Influence of MoSi 2 Addition on Load‐Dependent Fretting Wear Properties of TiB 2 Against Cemented Carbide
Author(s) -
Raju G. Brahma,
Basu Bikramjit
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03173.x
Subject(s) - materials science , fretting , cermet , sintering , carbide , spall , wear coefficient , metallurgy , composite material , cemented carbide , wear resistance , hot pressing , fretting wear , tribology , ceramic
In an earlier work, it was observed that the use of MoSi 2 (up to 10 wt%) enhanced the densification and mechanical properties of TiB 2 . Therefore, the motivation of this study is three‐fold: (a) to assess whether a small amount of MoSi 2 addition can enhance wear resistance property, (b) to study whether the MoSi 2 addition will influence the formation of a tribochemical layer, and (c) to correlate the wear resistance with material properties in TiB 2 –MoSi 2 materials. In order to address these issues, a series of fretting experiments were conducted systematically by varying load (2, 5, and 10 N) at an oscillating frequency of 4 Hz and a 100 μm linear stroke, for a duration of 100 000 cycles with a cemented carbide (WC—6 wt% Co cermet) ball as a counterbody. The average coefficient of friction of the TiB 2 samples varied within a narrow range (0.50–0.54), without being much affected by either the sintering additive or the load. The wear volume increased with increasing load, while the specific wear rate of all the TiB 2 compositions falls within a mild wear regime (1.1–3.4 × 10 −6 mm 3 /Nm). Based on the experimental results, it can be said that the addition of MoSi 2 degrades neither the wear resistance properties nor the frictional properties of TiB 2 , within the investigated load regime. The microcracking‐induced spalling has been found to be the dominant mechanism and, consequently, the wear volume is observed to have a linear dependency on the abrasion parameter. It is noteworthy that the tribo‐oxidation as well as the formation of finer wear debris particles occurs to a limited extent.