Effect of sintering temperature on microstructure and biological activity of Sr-HA/Ti composites

doi:10.13251/j.issn.0254-6051.2020.07.027

Abstract

Abstract: Strontium-doped hydroxyapatite (Sr-HA) powders were prepared by sol-gel method. The Sr-HA powders and Ti powders were compacted into compacts at a mass ratio of 2∶8, then prepared into Sr-HA/Ti biocomposites by sintering under atmospheric environment, and the effect of sintering temperature on the structure and biological activity of the Sr-HA/Ti biocomposites was studied. The results show that: the Sr-HA/Ti composites after sintering are mainly composed of Sr-HA, Ti, TiO₂ and CaO phases. When the sintering temperature reaches 950 ℃, the surface oxidation of the composites is serious and the decomposition of Sr-HA phase increases. The pore size of Sr-HA/Ti composites sintered under atmospheric conditions can meet the basic requirement of bone tissue growth, and the metallurgical bonding of the composites after sintering is good. With the increase of sintering temperature, the number of pores on the surface of the composites increases, the pore diameter decreases, and the fine pores are evenly distributed between the titanium dioxide and α-Ti grid structure. After immersiing in simulated body fluids for 14 days, the ceramic phases depositing on the surface of the sample sintered at 850 ℃ are the best, and the Ca₅(PO₄)_3-x(CO₃) _xOH phase beneficial to osteogenesis is formed on the surface of the composites.

Key words: sintering temperature, bio-composites, microstructure, biological activity in vitro

CLC Number:

TB333

Li Gang, Wang Ying, Tian Zongwei, Meng Chao. Effect of sintering temperature on microstructure and biological activity of Sr-HA/Ti composites[J]. Heat Treatment of Metals, 2020, 45(7): 135-138.

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