title: Frictional wear characteristics of biomedical Ti-29Nb-13Ta-4.6Zr alloy with various microstructures in air and simulated body fluid.
abstract: The frictional wear characteristics of Ti-29Nb-13Ta-4.6Zr alloy subjected to solution treatment (referred to as TNTZ(ST)) and aged at 598, 673 and 723 K after solution treatment (referred to as TNTZ(598K), TNTZ(673K) and TNTZ(723K), respectively) were investigated in air and a simulated body environment (Ringer's solution) as a function of the loading level. Ti-6Al-4V ELI alloy aged at 813 K after solution treatment (referred to as T64(STA)) was employed as a reference material. Wear weight losses of TNTZ(ST), TNTZ(598K), TNTZ(673K), TNTZ(723K) and Ti64(STA) are lower in Ringer's solution than in air under both low and high loading conditions (1.96 and 29.4 N, respectively). It is considered that the frictional factor decreases because of the lubricating effect of Ringer's solution between the contact surface of the specimen and the zirconia ball-the mating material. Moreover, the wear weight losses of TNTZ(598K), TNTZ(673K) and TNTZ(723K) are lower than that of Ti64(STA) in both air and Ringer's solution under the low loading condition, but are higher under the high loading condition. This result implies that the transition from severe wear to mild wear versus loading level depends on the type of material.
authors.affiliation: Department of Biomaterials Science, Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, 980-8577, Japan. niinomi@imr.tohoku.ac.jp
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Niinomi
authors.forename: Masaaki
authors.initials: M
authors.lastname: Nakai
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Akahori
mesh_terms: D000388:Air; D000497:Alloys / Q000737:chemistry*; D040761:Biomimetic Materials / Q000737:chemistry*; D001826:Body Fluids / Q000737:chemistry*; D017276:Friction; D008422:Materials Testing; D010316:Particle Size; D012996:Solutions; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; D012996:Solutions; D014025:Titanium