Performance and Fracture Toughening of Biological Coating Prepared by Ultrasonication-assisted Micro-arc Oxidation Technique on Ti-13Nb-13Zr Alloy Surface
WANG Fengbiao1, ZHANG Jiayi1, DING Ru1, LI Yinyu1, LI Lili1, CHEN Song2
1 School of Mechanical Engineering, Shenyang Ligong University, Shenyang 110168; 2 School of Mechanical Engineering & Automation, Liaoning University of Science and Technology, Anshan 114051
Abstract: To improve the fracture mechanical property of the brittle biological coating prepared by micro-arc oxidation (MAO) on the Ti-13Nb-13Zr alloy surface, a combined technique of ultrasonication and micro-arc oxidation (US+MAO) was used to fabricate Ca-P biological coating. Indentation test was adopted to analyze coating fracture toughness, and scanning electron microscopy (SEM) and X-ray diffraction (XRD) were employed to determine coating surface morphology and phase composition. Moreover, the coating performance was compared with that prepared by the original MAO process, and the toughening factors were analyzed. The results show that all the US+MAO coatings have higher fracture toughness compared with coatings prepared by the ori-ginal MAO process under the same duty cycle. Phase transformation toughening of partial rutile TiO2 to anatase, coating densification and thickening induced by ultrasonic cavitation effect, and the well distributed micro-cracking are the main causes that lead to enhanced fracture mechanical property. This combined technique achieves the toughening of MAO titanium alloy biological coating.
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2017, Vol. 31 
