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Improved wear properties of high energy ion-implanted polycarbonate

Published online by Cambridge University Press:  03 March 2011

G.R. Rao ,
E.H. Lee ,
R. Bhattacharya  and
A.W. McCormick
G.R. Rao
Affiliation:
Oak Ridge National Laboratory, Bldg. 5500, M.S. 6376, Oak Ridge, Tennessee 37831–6376
E.H. Lee
Affiliation:
Oak Ridge National Laboratory, Bldg. 5500, M.S. 6376, Oak Ridge, Tennessee 37831–6376
R. Bhattacharya
Affiliation:
UES, Inc., 4401, Dayton-Xenia Road, Dayton, Ohio 45432
A.W. McCormick
Affiliation:
UES, Inc., 4401, Dayton-Xenia Road, Dayton, Ohio 45432
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Abstract

Polycarbonate (LexanTM) (PC) was implanted with 2 MeV B+ and O+ ions separately to fluences of 5 × 1017, 1 × 1018, and 5 × 1018 ions/m2, and characterized for changes in surface hardness and tribological properties. Results of tests showed that hardness values of all implanted specimens increased over those of the unirradiated material, and the O+ implantation was more effective in improving hardness for a given fluence than the B+ implantation. Reciprocating sliding wear tests using a nylon ball counterface yielded significant improvements for all implanted specimens except for the 5 × 1017 ions/m2 B+-implanted PC. Wear tests conducted with a 52100 steel ball yielded significant improvements for the highest fluence of 5 × 1018 ions/m2 for both ions, but not for the two lower fluences. The improvements in properties were related to Linear Energy Transfer (LET) mechanisms, where it was shown that the O+ implantation caused greater ionization, thereby greater cross-linking at the surface corresponding to much better improvements in properties. The results were also compared with a previous study on PC using 200 keV B+ ions. The present study indicates that high energy ion irradiation produces thicker, more cross-linked, harder, and more wear-resistant surfaces on polymers and thereby improves properties to a greater extent and more efficiently than lower energy ion implantation.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 1 , January 1995 , pp. 190 - 201
Copyright
Copyright © Materials Research Society 1995

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References

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