Thermal-expansion and mechanical properties of the Ca10(P04)6(OH)2-TiO2 composite

Abstract

Hydroxyapatite is a particularly attractive material for human tissue implantation. The intrinsic poor mechanical properties of hydroxyapatite material can lead to instability and unsatisfactory duration of the implant in the presence of body fluids and local loading. Addition of TiO2 in the hydroxyapatite matrix can enhance the mechanical properties of the obtained composite. The composite with 15 % TiO2 content shows a thermal stability of the system and improved mechanical properties

Pulsed laser deposition and in vitro characteristics of triphasic – HASi composition on titanium

“…The resulting high residual stress is thought to be responsible for the low bonding strength between the two materials. 9,10 Most of the technique employed till date use a high temperature process such as plasma spray or enamelling to obtain coating over metallic substrate. This may cause failure of coating at the interface due to the non-homogenous nature of deposit in terms of composition, thickness, etc.…”

Effect of ZrO2, TiO2, and Al2O3 Additions on Process and Kinetics of Bonelike Apatite Formation on Sintered Natural Hydroxyapatite Surfaces

“…2 So, it is only used in nonload areas of the human body such as the ossicles in the middle ear. [16][17][18] Fidancevska et al have shown that composite with 15% TiO 2 content improves mechanical properties. Several works have consequently been carried out on structural modifications and mechanical properties of HA in the presence of oxides or metallic dispersions used as reinforcing agents.…”

“…For full utilization of bioactive HA-based implants, improvements in their mechanical properties are well recommended. 18 When mechanical properties values of pure HA and HA composites are compared between them in the literature review, it can be concluded that these different values are closely related to the samples preparation methods (Table I). Among them, zirconia (ZrO 2 ) and alumina (Al 2 O 3 ) additions have been found to retain high mechanical strength and toughness without degrading the biocompatibility of HA samples.…”

“…In addition, titania was used as a reinforcing agent. [16][17][18] Fidancevska et al have shown that composite with 15% TiO 2 content improves mechanical properties. For example, the young modulus and shear modulus were increased from 102 and 39 GPa in pure HA to 117 and 46 GPa in HA-TiO 2 composites, respectively.…”

“…For example, the young modulus and shear modulus were increased from 102 and 39 GPa in pure HA to 117 and 46 GPa in HA-TiO 2 composites, respectively. 18 When mechanical properties values of pure HA and HA composites are compared between them in the literature review, it can be concluded that these different values are closely related to the samples preparation methods (Table I). 5,8,13,16,[22][23][24] The densification rate and other microstructure features, such as grain and pore size, which depend on processing parameters and sintering temperature, may potentially modulate the mechanical properties of HA.…”