科研之友
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摘要
In this paper, TaxC1-x coatings were deposited on 316L stainless steel (316L SS) by radio-frequency (RF) magnetron sputtering at various substrate temperatures (T-s) in order to improve its corrosion resistance and hemocompatibility. XRD results indicated that T-s could significantly change the microstructure of TaxC1-x coatings. When T-s was < 150 degrees C, the TaxC1-x coatings were in amorphous condition, whereas when T-s was >= 150 degrees C, TaC phase was formed, exhibiting in the form of particulates with the crystallite sizes of about 15-25nm (T-s = 300 degrees C). Atomic force microscope (AFM) results showed that with the increase of T-s, the root-mean-square (RMS) values of the TaxC1-x coatings decreased. The nano-indentation experiments indicated that the TaxC1-x coating deposited at 300 degrees C had a higher hardness and modulus. The scratch test results demonstrated that TaxC1-x coatings deposited above 150 degrees C exhibited good adhesion performance. Tribology tests results demonstrated that TaxC1-x coatings exhibited excellent wear resistance. The results of potentiodynamic polarization showed that the corrosion resistance of the 316L SS was improved significantly because of the deposited TaxC1-x coatings. The platelet adhesion test results indicated that the TaxC1-x coatings deposited at T-s of 150 degrees C and 300 degrees C possessed better hemocompatibility than the coating deposited at T-s of 25 degrees C. Additionally, the hemocompatibility of the TaxC1-x coating on the 316L SS was found to be influenced by its surface roughness, hydrophilicity and the surface energy.
