Technical Brief

Low-Wear High-Friction Behavior of Copper Matrix Composites Dispersed With an In Situ Polymer Derived Ceramic

[+] Author and Article Information
Enzo Castellan

Department of Materials Science and Engineering,
University of Trento,
Mesiano 77,
Trento 38050, Italy
C & Z Italia S.r.1,
Via Alto Adige 160,
Trento 38121, Italy
e-mail: enzocastellan@gmail.com

Satish V. Kailas

Department of Mechanical Engineering,
Indian Institute of Science,
Bangalore 500012, India email: satvk@mecheng.iisc.ernet.in

Shimjith Madayi

Department of Mechanical Engineering,
Indian Institute of Science,
Bangalore 500012, India
e-mail: shijmu.83@gmail.com

Rishi Raj

Department of Mechanical Engineering,
University of Colorado at Boulder,
Boulder, CO 80309-0427
e-mail: rishi.raj@colorado.edu

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 12, 2014; final manuscript received October 30, 2014; published online December 18, 2014. Assoc. Editor: Hong Liang.

J. Tribol 137(2), 024501 (Apr 01, 2015) (4 pages) Paper No: TRIB-14-1014; doi: 10.1115/1.4028973 History: Received January 12, 2014; Revised October 30, 2014; Online December 18, 2014

We show that copper-matrix composites that contain 20 vol. % of an in situ processed, polymer-derived, ceramic phase constituted from Si-C-N have unusual friction-and-wear properties. They show negligible wear despite a coefficient of friction (COF) that approaches 0.7. This behavior is ascribed to the lamellar structure of the composite such that the interlamellar regions are infused with nanoscale dispersion of ceramic particles. There is significant hardening of the composite just adjacent to the wear surface by severe plastic deformation.

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Grahic Jump Location
Fig. 1

Hot consolidation and in situ conversion of the cryo-milled powders of polymer and copper into PD-MMCs

Grahic Jump Location
Fig. 2

SEM micrographs of the polished cross section from Fig. 1. Note the ceramic interlayers lying in between the lamellae are interspersed with nanograins of copper (the bright spots within the ceramic layer of dark contrast).

Grahic Jump Location
Fig. 3

Measurements of COF and wear-depth with sliding distance at two applied loads with a aluminum-oxide counter-face

Grahic Jump Location
Fig. 4

The hardening and the dispersion of the microstructure near the wear surface




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