Periodical micro-structure and parameter optimization of pyrolytic carbon surface induced by nanosecond laser
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1.
Department of Mechanical Engineering, Jiangsu University of Technology, Changzhou 213001, China;
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2.
Center for Photon Manufacturing Science and Technology, Jiangsu University, Zhenjiang 212013, China
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Received Date:
2012-10-31
Accepted Date:
2012-12-19
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Abstract
In order to find the optimal parameters of laser processing,the micro-structures were fabricated on pyrolytic carbon of the artificial heart valves with nanosecond laser. Effects of pulse energy, scanning times, pulse width, scanning speed and scanning gap on the melt rules of the pyrolytic carbon were analyzed. Three kinds of micro-structures were fabricated according to the melt rules of pyrolytic carbon. The conditions of superhydrophobicity were analyzed according to Cassie theory. When the percentage of pyrolytic carbon surface micro-structures to the total area in the unit area is less than 20%, the surface becomes superhydrophobic. Choosing contact angle as test index, the experimental program was optimized according to orthogonal design. Micro-structures of pit array, parallel grating and mastoid were fabricated successfully on the surface of pyrolytic carbon under six kinds of experimental programs. The testing results of contact angle show that the six kinds of micro-structures surfaces have the superhydrophobicity after silanization. The results are helpful for the fabrication of the artifical heart valves of anticooagulant property.
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