Study Of Porous Structure Preparation And Wettability On Titanium And Titanium Alloy Surfaces

Wettability is an important property of the solid material and film surfaces and it is well known that surface wettability is not only dependent upon their chemical compositions but also closely related to the micro/nano-structures on their surfaces. Surface with special wettability including superhydrophobic and superyhydrophilic surfaces is a new hotspot at present. Furthermore, there was direct relation between the biocompatibility of titanium and titanium alloy implant and its surfaces wettability. Titanium implant surface with porous structure both have high mechanical interlocking strength and biological activity.Firstly, micro/nano-structures surfaces with superyhydrophilic on TC4and TA4are achieved by using sandblast-acid etching. By comparatively study on different processes we find that porous surface micro/nano-structures with superyhydrophilic can achieved by etching in H2SO4/HCl solution or HF/HNO3&H2SO4/HCl double solution. TA4is more corrosive rather than TC4.Secondly, titanium oxide surfaces are achieved on SLA surfaces by using plasma oxidation base on PECVD vacuum film-plating machine. The water contact angle (CA) of this surfaces begin to increase and then decrease with increasing the self-bias voltage, and decrease with increasing treat time but no relation to the change of oxygen flow. Suphyhydrophilic TiO2(Anatase) surface can achieved while the self-bias voltage is360V, treat time is20min and oxygen flow is1sccm. Ahesion and proliferation experiments of osteogenic cells showed that biological of plasma treated sample is more activie than annealing sample.Finally, we attempt to prepare superhydrophobic surface by using self-assembled monolayers (SAMs), the maximal CA is120°while superyhydrophilic titanium oxide surfaces with micro/nano-structures as substrate and dodecyltrichlorosilane as film material. Superhydrophilic and hydrophobic surface can under control transform by UV light, plasma treat and darkroom placed. Above all, this paper begins in creating micro/nano-structures which is very important to surface with special wettability. Mainly research is the effects of the SLA and plasma oxidation on wettability of titanium and titanium alloys surfaces. hydrophobic surface is achieved and the types of wettability can be control. We obtain some interesting and useful results.It laid the some foundation for subsequent in-depth study.