The Properties Of Diamond-like Carbon Films On Polycarbonate (pc)

The diamond-like carbon(DLC)films were prepared on polycarbonate(PC)by methods including plasma-enhanced chemical vapor deposition and radio frequency magnetron sputtering. The microstructure and morphology of DLC films were investigated by means of X-ray diffraction (XRD), laser Raman spectroscopy (Raman), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM).The properties of the DLC films were tested by surface roughness tester, pin-on-disc tester, nano-indentation and UV-VIS spectrometer.It is found that the thin films are amorphous films and have typical diamond-like characteristics by the analysis of XRD, Raman and XPS. The analysis data reveal that the structure and the composition of DLC film is determined by different experimental parameters. The DLC films deposited by magnetron sputtering are superior owing to less impuritiy during the thin film deposition process. And by spectra of SEM, it is noted that DLC films are very smooth and compact.The result of friction test, corrosion resistance test and nano-indentation show that DLC films have very good friction-reducing, wearable behavior, corrosion resistance, and microhardness.The results of UV-VIS spectrum show that DLC films can absorb ultraviolet completely and have very good optical transparent properties in visible light. The transmission rate of DLC is more than 80 percent in the visible light, which can meet the requirements of PC being the lens and other optical applications.Through the study of different interlayers, it is found that interlayers can improve the quality of films. In this paper, the composite DLC films with additional buffer layer have better performance:DLC films with interlayer have higher sp3 content, higher hardness, lower friction coefficient and better wear resistance. The interlayer can reduce stress within the film and enhance the adhesive strength between DLC top layer and PC substrate markedly. A number of data indicate that Si interlayer is better than SiOx transition layer during the formation of high-quality DLC films.In addition, the relationship between the microstructure, mechanical properties and visible light transmittanc of DLC films under different preparation parameters (such as input power, gas flow and transition layer) were studied.