Development of composites for dental implants obtained by ultrasonic mixture of TiH₂ powder and colloidal calcium phosphate

Abstract

<span style="mso-ansi-language:EN-US" lang="EN-US">Titanium-based composites with calcium and phosphor phases are prepared by ultrasound and powder metallurgy processing with TiH₂ and hydrated calcium phosphate powders. The mixtures are performed by ultrasound in water, dried by atomization process in flame, pressed at 600 MPa and vacuum-sintered at 1200°C for 2 h. Crystal phases of the as-fabricated composites are found to be α<span style="mso-ansi-language:EN-US" lang="EN-US">-Ti, CaTiO₃ and Ti_xP_y phase(s). The Ti_xP_y and CaTiO₃ phases resulted from the reaction between titanium and tricalcium phosphate at about 1130°C. The as-fabricated composites presented higher compressive strength than the yield stress of pure cast titanium and lower contact angles than vacuum-sintered TiH₂. Contact angles are further decreased by a chemical treatment.

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