Rapidly sintering of interconnected porous Ti-HA biocomposite with high strength and enhanced bioactivity.
In this work, interconnected porous Ti-HA biocomposites with enhanced bioactivity, high porosity and compressive strength were prepared by spark plasma sintering (SPS) and space holder method. Pore characteristics, mechanical properties, corrosion behaviors and in vitro bioactivity of the porous Ti-HA were investigated. Results showed that porous Ti-HA with 5-30wt% HA contents possessed not only low elastic modulus of 8.2-15.8GPa (close to that of human bone) but also high compressive strength (86-388MPa). Although the HA partially decomposed and formed secondary phases, the sintered porous Ti-HA can still be good bioactivity. The homogeneity and the thickness of apatite layer increased significantly with the increase of HA. But with the thickness of apatite layer increased, micro-cracks appeared on the surface of porous Ti-30%HA. A model was built to discuss the current distribution and sintering mechanism of HA on Ti matrix during SPS process. It indicated that the excessive addition of HA would deteriorate the sintering quality, thus decreasing the mechanical properties and corrosion resistance. However, the combination of interconnected pore characteristics, low elastic modulus, high compressive strength and enhanced bioactivity might make porous Ti-HA biocomposites prepared by SPS a promising candidate for hard tissue implants.
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; Engineering Technology Research Center of Titanium Products and Application of Yunnan Province, Kunming 650093, China.
L
L
Zhang
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; Engineering Technology Research Center of Titanium Products and Application of Yunnan Province, Kunming 650093, China.
Z Y
ZY
He
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; Engineering Technology Research Center of Titanium Products and Application of Yunnan Province, Kunming 650093, China. Electronic address: zyqkust@163.com.
Y Q
YQ
Zhang
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Y H
YH
Jiang
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
R
R
Zhou
D018786:Bone Substitutes / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D006801:Humans; D016062:Porosity; D014025:Titanium / Q000737:chemistry*
D018786:Bone Substitutes; D017886:Durapatite; D014025:Titanium
Enhanced bioactivity; Interconnected pore characteristics; Porous titanium-hydroxyapatite biocomposites; Spark plasma sintering