The Study of The Optics Characteristics of Colorful Titanium Oxide Thin Layer Manufactured by EDM Process
Date Issued
2009
Date
2009
Author(s)
Song, Pei-Lun
Abstract
Titanium and its alloys have been used widely in automotive, aerospace, and biomedical industries for a long time due to its excellent mechanical and chemical properties. They were used in civil industry just in recent years. The oxide of titanium not only has good wear resistance and chemical stabilization, but also displays various colors when it is in thin film form. These attractive and various colors of titanium oxide thin film make itself have considerable commercial benefit.n this study, a commercial EDM machine was reformed to use. The electrode were copper, the workpiece were pure titanium, and dielectric fluid were just tap water. This study investigated the influence of EDM parameters on making titanium oxide reacted thin film by EDM process, including processing time, open voltage, pulse duration, pulse interval, peak current, gap. Finally, colorful titanium oxide thin film manufacturing process without damage on workpiece surface was developed by using the database of this study.he result shows that the reacted film became thicker while higher open voltage. The colors of titanium oxide reacted films were changed by the following open voltage, from 0 to 240 volts: yellow（10V）、purple（20V）、indigo（30V）、golden yellow（70V）、peach（100V）、blue（130V）、yellow green（180V）、pink（240V）. The other open voltage produced transitive color which was between the colors produced by the neighbor open voltage. The increasing of pulse duration and pulse interval caused the non-uniform color distribution. The peak current did not influence the color of reacted film. But while peak current was higher then 2A, the craters appeared on the worked surface. The gap influenced the expending area of reacted film.nd the results of XRD and EDS analysis show that the structure of reacted film is . This process was inferred that it includes electrochemistric reaction and thermochemistric reaction. Using ellipsometer, we got the variation of index of refraction and absorption in visible light range with different film thickness. Compared with anodizing process, the colorful titanium oxide reacted film with EDM process we developed is simpler, faster, cheaper, having advantages in environment protection and lower hazard.
Subjects
Titanium oxide reacted film
Open voltage
Color
Bititanium oxide
Type
thesis
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