Preparation of CTS Coatings Containing Calcium and Phosphorus on Titanium Surface by the Cathode Liquid Phase Plasma Technology

摘要

Chitosan (CTS) coatings contained calcium (Ca) and phosphorus (P) on titanium(Ti) surface are prepared by the cathode liquid phase plasma technology (CLPT), in a certainconcentration electrolyte solution with selective additions of ammonium dihydrogen phosphateand calcium nitrate. It is indicated that the parameters for a stable discharge are voltage of400 V, frequency of 100 Hz, duty cycle of 30% based on a large amount of experiment data. Themorphology, structure and composition of the coated samples are studied by SEM, FTIR, XRD,XPS. The results demonstrate that the composite coatings are uniform, and some solid particles ofinorganic salt containing calcium and phosphorus dispersed on the coatings. CA tests show thatthe samples treated by the liquid plasma became less hydrophilic. The variation of hydrophilicityon the CLPT treated titanium is attributed to the change of the function groups on the samplesurface. Meanwhile, a possible formation mechanism of the composite coatings is discussed.