Tribological characterization of Si3N4-bioglass biocomposites in self-mating experiments and dissimilar tests against UHMWPE

resumo

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.

palavras-chave

WEAR; POLYETHYLENE; FRICTION; BEHAVIOR

categoria

Materials Science

autores

Abreu, C; Amara, M; Oliveira, FJ; Santos, JD; Silva, RF; Gomes, JR

nossos autores

Partilhe este projeto

Publicações similares

Usamos cookies para atividades de marketing e para lhe oferecer uma melhor experiência de navegação. Ao clicar em “Aceitar Cookies” você concorda com nossa política de cookies. Leia sobre como usamos cookies clicando em "Política de Privacidade e Cookies".