Synthesis and Characterization of Hydroxyapatite Nanocoatings by Sol–Gel Method for Clinical Applications - Biological and Biomedical Coatings: Processing and Characterization - page 70

TABLE 2.2
Mechanical Property Data of Sol-Gel Derived HAp Coatings Compared to HAp from Other Deposition Techniques and Other Coatings

Deposition
Method

Hardness
(GPa)

Young'sModulus
(GPa)

Strength
(MPa)

InterfaceFracture
Energy(J/m 2 ) CoatingonSubstrate Study

HAp on pure titanium Sol-gel 0.38 25 481 ± 38 0.45 ± 0.1 Roest (2010)

HAp on Ti6Al4V Sol-gel - 42.73 ± 4.4 598.22 ± 61.6 - Zhang et al. (2007)

HAp on stainless steel
(316)

Plasma-spray 1.5-5.0 60-100 - - Dey et al. (2009)

HAp on Ti6Al4V Plasma-spray - 23-33 - - Yang and Lui (2008)

ZrO2 on pure titanium Sol-gel 4.2 138 480 ± 50 4 ± 0.8 Roest (2010)

SiO2 on polyester Sol-gel 2.5 ± 0.27 13.6 ± 0.4 - - Chan et al. (2000)

SiO2 on copper Sol-gel 2.4 ± 0.29 42.66 ± 2.33 1706 20 Atanacio et al. (2005)

Thermally grown TiO2
on pure titanium

Thermal
oxidation

13.9 ± 0.2 259 1340 ± 60 - Latella et al. (2007a)

Dense HAp (bulk
ceramic)
≈ 1% porosity

Sintered 16.1 ± 0.5 137 ± 3 - - Kealley et al. (2008)

Porous HAp (bulk
ceramic)
≈ 50% porosity

Sintered 0.79 ± 0.02 20.01 ± 0.23 - - He et al. (2008)

Compact human bone - - 17-18.9 (p) a

11.5 (n)

124-174 (p)
49 (n)

- Suchanek and Yoshimura (1998)

Dry trabeculae 0.52-0.74 19.4 ± 2.3 (p)

15 ± 2.5 (n)

- - Rho et al. (1999)

Enamel occlusal section
(human tooth)

- 3.23 ± 0.38 94 ± 5 - - Xu et al. (1998)

Note: Comparative data is provided for bulk HAp, bone, and dentin.
Tensile strength - testing direction parallel (p) or normal (n) to the axis of the bone.