Tribological characterization of Si3N4-bioglass biocomposites in self-mating experiments and dissimilar tests against UHMWPE
authors Abreu, C; Amara, M; Oliveira, FJ; Santos, JD; Silva, RF; Gomes, JR
editors Vieira, T
nationality International
journal ADVANCED MATERIALS FORUM I
author keywords bioceramics; bioglasses; friction; silicon nitride; wear
keywords WEAR; POLYETHYLENE; FRICTION; BEHAVIOR
abstract The tribological behaviour of a new bioceramic material, a Si3N4-bioglass composite, is investigated. The experiments were performed in a pin-on-disc tribometer with constant sliding speed (0.1 ms(-1)) at two distinct loads (0.5N and 5N), in dry and wet (Hank's balanced salt solution, HBSS) conditions. In self-mated dry experiments, the 20wt% bioglass composite presents the lowest wear coefficient (K=3.7x10(-6)mm(3)N(-1)m(-1)) due to its. better intrinsic mechanical characteristics. Fine scale abrasion at low loads and extensive fracture at high loads were the main wear mechanisms. For lubricated experiments in HBSS media, both the wear and the friction coefficients decrease comparing to the dry sliding tests, namely under an applied load of 5N, that promotes the retention of a protective tribolayer. The best tribological system was the dissimilar pair Si3N4-20wt.% bioglass/UHMWPE, for which K=1.2x10(-6)mm(3)N(-1)m(-1) and K=7.1x10(-7)mm(3)N(-1)m(-1) in respectively, and f=0.1, exhibiting a considerable potential for prosthetic applications.
publisher TRANS TECH PUBLICATIONS LTD
issn 1013-9826
isbn 0-87849-905-9
year published 2002
volume 230-2
beginning page 455
ending page 458
web of science category Materials Science, Ceramics; Materials Science, Composites
subject category Materials Science
unique article identifier WOS:000179553200104
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