Effect of calcination temperature on wear resistance of nanosized alumina alpha for biomedicals applications
2018
Friction and wear problems in the prosthesis for substitution of hip joints have been widely studied [1–6]. The choice of the materials for the total hip prosthesis takes a many properties in consideration such as mechanical resistance, tribological proprieties [2-4]. Ceramics can be given a very high, scratch-resistant, low friction coefficient and hight wear resistance. [3-8]. Many studies were investigated friction and wear resistance of hip prostheses [16-21]. Nanocrystalline ceramics are extensively being studied with the aim of improving their mechanical properties by reducing grain sizes [9] crack propagation resistance [3-10]. The structural evolution and tribological behavior of the nanostructured alumina Alpha (α-Al 2 O 3 ) powder, formed by calcinations of gibbsite (Al 2 (OH) 6 ) at different temperatures (100-1200 °C) were reported using X Ray diffraction, XPS, MEB and Type ball on Disk tribometer. XRD analysis indicates that the transformation sequence involves the formation of κ-Al 2 O 3 as an intermediate phase between χ- and α-Al 2 O 3 . The crystallite size of treated alumina (α-Al 2 O 3 ) is as small as 10 nm after calcinations at 1200°C. The sliding wear rate and wear coefficient of friction were lower in the nanocrystalline samples calcined at 1200 °C at same applied load (3, 6 or 10 N). The enhanced friction and wear resistance is endorsed to the finer microstructure, hardness of the sample calcined at 1200 °C
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