Sintering Effect on Mechanical Properties of Composites of Bovine Derived Hydroxyapatite (BHA) with Titanium

Abstract

The aim of this study was to prepare high performance biomaterials suitable for use at load bearing applications with high bioactivity. The hydroxyapatite (HA) was prepared from bovine bones via calcination technique. The bovine derived HA (BHA) was mixed with 5 and 10 wt% metallic titanium (Ti) and the obtained homogenous mixtures were pressed to produce the test samples. The compacts were sintered at temperatures between 1000 and 1300°C. Compression strength, density, and microhardness were measured. SEM and X-ray diffraction studies were also made. The best mechanical properties were obtained between after sintering at 1200-1300°C.

Highly Bioactive Porous Composite Scaffolds of Bovine Hydroxyapatite (BHA-Ti, BHA-TiO₂, BHA-Li₂O)

“…1a). Cracking is likely due to the big difference of the thermal expansion coefficients between HA and Ti [9]. The gap of chemical nature between HA and Ti can also cause mismatch problems at ceramic/metal interface [9].…”

“…Cracking is likely due to the big difference of the thermal expansion coefficients between HA and Ti [9]. The gap of chemical nature between HA and Ti can also cause mismatch problems at ceramic/metal interface [9]. The surface oxidation of metallic Ti, which inevitably takes place during heat treatment of Ti in air, should be also considered.…”

Microstructure in Pressureless-Sintered Iron-Containing Hydroxyapatite/Titanium Composites

“…But the problems of coated layers being often worn off or causing in-vivo fatigue failure occurred [5][6][7][8][9]. A promising method to enhance the strength while retaining high bioactivity is to fabricate HA/Ti composites [10,11]. However, it is also challenging to fabricate cost-effectively HA/Ti composite due to the mismatch of the thermal expansion coefficients.…”

“…However, it is also challenging to fabricate cost-effectively HA/Ti composite due to the mismatch of the thermal expansion coefficients. Hot pressing or high sintering temperature is normally needed to densify the composites [10,11], while at high temperatures the decomposition of HA could prevent densification [12]. Besides, the decomposition products could result in a higher dissolution rate of HA in the body liquid [13].…”