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Effects of Process Parameters on the Coating Properties of APS TiO2 Bioceramic Coatings
Hak-KwanKim,Ju-WoongJang,Byoung-SooKim,Ji-WoongMoon,Deuk-YongLee,Chang-HeeLee 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.2
The effects of process parameters on coating formation and coating properties were investigated using a fused and crushed TiO2 powder by the Taguchi method and L9(34) orthogonal array. The Taguchi analysis was conducted through the results of the coating properties affected strongly by plasma spraying parameters and TiO2 powder was sprayed on Ti-6Al-4V alloy substrate. The coating properties were characterized by thickness, microhardness, porosity and surface roughness using optical microscopy, image analyzer and surface roughness tester respectively. An observed optimum condition of plasma spraying process could be found for potential use as a bioceramic coating.
Biotribological Properties of TZP/Al2O3 Ceramics for Biomechanical Applications
DeukYogLee,Se-JongLee,Ju-WoongJang,Hak-KwanKim 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.6
Biotribological properties, such as wear rate and friction coefficient, of 3Y-TZP and low temperature degradation(LTD) free materials were investigated via a ball(SiC)-on-plate sliding wear test to evaluate the relationship between wear mechanism and phase transformation. Wear test was conducted with a sliding speed of 0.035 m/s at room temperature and at 250oC in air under a normal load of 49 N, respectively. Although friction coefficient of 3Y-TZP was the lowest due to the fine grain size, the highest wear loss and rate were observed due to the debris of monoclinic grains introduced during sliding and their values increased drastically with raising temperature. However, the biotribological properties of LTD-free materials were insensitive to temperature due to the inertness of the phase transformation, suggesting that they may be applicable to the biomechanical parts.