Microstructure development on sintered Ti/HA biocomposites produced by powder metallurgy

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 14; no. 3; pp. 384 - 393
• Main Authors: Balbinotti, P, Gemelli, E, Buerger, G, Lima, S A, Jesus, J, Camargo, N H A, Henriques, V A R, Almeida, Soares G D
• Format: Journal Article
• Language: English; Portuguese; Spanish
• Published: ABM, ABC, ABPol 01.09.2011; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: composite; Decomposition reactions; ENGINEERING, CHEMICAL; Hydroxyapatite; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; Nucleation; Particulate composites; Phases; Powder metallurgy; Protective coatings; Sintering; Surgical implants; Titanium; hydroxyapatite; powder metallurgy; titanium; composite
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/S1516-14392011005000044

Titanium-based composites with in-situ calcium and phosphor phases were prepared by powder metallurgy processing with titanium and hydroxyapatite (HA) powders. The mixtures were obtained in a friction mill with alcohol for 5 h, dried in a rotating evaporator, pressed at 600 MPa and sintered at 1200 C for 2 h in argon. The crystalline phases of the as-fabricated composite were found to be alpha-Ti, CaTiO3, Ca3(PO4)2 and TixPy. Analyses revealed that the Ti particles were covered with a compact layer of TixPy and CaTiO3 phases, which resulted from the decomposition of HA into CaTiO3 and beta-Ca3(PO4)2 at approximately 1025 C. The reactions were followed by the decomposition of beta-Ca3(PO4)2, resulting in the growth of a CaTiO3 layer and in the nucleation and growth of TixPy phase(s).