期刊
APPLIED SURFACE SCIENCE
卷 254, 期 6, 页码 1614-1621出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2007.07.129
关键词
diamond-like carbon; PTFE; chemical vapour deposition; plasma; adhesion; wear property
Diamond-like carbon (DLC) films were deposited on polytetrafluoroethylene (PTFE) using a radiofrequency plasma chemical vapour deposition method. Prior to DLC coating, the PTFE substrates were modified with O-2 and N-2 plasma to enhance the adhesion strength of the DLC film to the substrate. The effect of the plasma pre-treatment on the chemical composition and the surface energy of the plasma pre-treated PTFE surface was investigated by X-ray photoelectron spectroscopy (XPS) and static water contact angle measurement, respectively. A pull-out test and a ball-on-dise test were carried out to evaluate the adhesion strength and the wear properties of the DLC-coated PTFE. In the N-2 plasma pre-treatment, the XPS result indicated that defluorination and the nitrogen grafting occurred on the plasma pre-treated PTFE surface, and the water contact angle decreased with increasing the plasma pre-treatment time. In the 0, plasma pre-treatment, no grafting of the oxygen occurred, and the water contact angle slightly increased with the treatment time. In the pull-out test, the adhesion strength of the DLC film to the PTFE substrate was improved with the plasma pre-treatment to the PTFE substrate, and N-2 plasma pre-treatment was more effective than the O-2 plasma pre-treatment. In the ball-on-disc test, the DLC film with the N-2 plasma pre-treatment showed good wear resistance, compared with that with 02 plasma pre-treatment. (c) 2007 Elsevier B.V. All rights reserved.
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