The Surface Wettability And Cavitation Erosion Resistance Of Laser Manufacturing Ti6Al4V

As having many advantages, Titanium is called "metal of sea". It is the important material in Marine Engineering, especially in the military engineering. It can improve the overall performance of the vessels, Hence, Titanium's high property can improve capabilities and reduce the cost of the ship.It has been fully proved that cavitation and cavitation erosion are harmful effects for propellers of the ships and the project structure of maritime, and has been extensive studied. In recent years, hydrophobic surface has many advantages, for example, self-cleaning, friction reduction, prevent the surface oxidation corrosion. Especially, it has huge advantages in ocean engineering. Preparing and using superhydrophobicity in vessels is becoming new discover in cavitation about the vessels. But it is few research about the influence of cavitation characteristics of surface wettability.In this paper, Surface wettability of cavitation was transformed by laser surface texture processing and self-assembly molecular membrane, in order to change surface wettability and provide the theory basis and the technical support for making the new cavitation erosion resistance titanium work were did as follows:1,In order to change the surface wettability of Ti6A14V, the Ti6A14V was treated into regular dot matrix structure with lattice structure by laser manufacturing, self-assembled monolayers of FDTS,FOTS,OTS and MPS were prepared on texturing surface by self-assembled method. The contact angle is ranked from big to small: FDTS>FOTS>OTS>MPS. and the maximum angle can reach 164.5°, superhydrophobic surfaces are prepared.2,Comparation of measured contact angles with the contact angles calculated with both models shows that the measured contact angles larger than 150°are close to the contact angles calculated with Cassei model, however, the measured contact angles less than 150°approach the contact angles calculated with Wenzel model. Contact angles can be controlled by adjusting spacing of texture and choosing different self-assembled monolayers.3,in order to explore the effects of surface wettability and laser manufacturing on the characterisitics of cavitation erosion resistance of materials. Line and grid texture are manufactured to Ti6A14V alloy with laser surface modification method. preparing FOTS self-assembled monolayers, the Hydrophobic of the surface was increased, he cavitation erosion resistances of the specimen was improved, and the grid texture is stronger than the line texture.