Shengrong Yang

SURFACE MODIFICATION OF POLYETHYLENE TEREPHTHALATE IMPLANTED BY ARGON IONS

Modification of polyethylene terephthalate (PET) was carried out by 120 Modification of polyethylene terephthalate (PET) was carried out by 120

Tribological Behavior of MoSi2 and Its Composites in Sliding Against Ni-Based Alloys

In this paper, MoSi2 and its composites were fabricated by hot pressing method. The roles of the second phase as mechanical and tribological components were studied. The results showed that B4C and ZrO2 particulates could be used for the strengthening and toughening of MoSi2 respectively. The tribological behaviors of MoSi2 and its composites sliding against Ni–Cr alloy and Ni–Cr–S alloy at room temperature and 600 °C were investigated on a tribometer with a pin-on-disk configuration. MoSi2–SiC exhibited the best tribological performance. The wear behaviors of MoSi2 and its composites were well correlated with their toughening mechanisms in sliding against Ni–Cr alloy at room temperature. Due to the introduction of chromium sulfides, the formation and removal process of the transferred layers at 600 °C controlled the wear mechanism of MoSi2 and its composites. The tribo-oxidation was an important factor favorable to wear reduction.

Tribological properties of nitrogen, carbon and titanium ion implanted PET against steel

Abstract A 25 μm thickness polyethylene terephthalate (PET) film was implanted with 120 keV ions of nitrogen, carbon, and titanium to doses of 1×10 14 , 1×10 15 , 5×10 15 and 1×10 16 ions cm −2 , respectively. The structure of the implanted PET was characterized by X-ray photoelectron spectroscopy (XPS), and the friction and wear behaviours of both implanted and unimplanted PET were investigated using a one-way reciprocating friction tester against a steel ball. Results indicate that ion implantation at a dose of 1×10 15 ions cm −2 increased the friction coefficient, whereas the carbon ion implantation at a dose of 1×10 16 ions cm −2 decreased the friction coefficient. All the tests showed that ion implantation lowered the wear rate, other than carbon ion implantation at a dose of 1×10 16 ions cm −2 . XPS analysis revealed the break of Cue5fbO and Cue5f8O bonds and the formation of Cue5f8N bonds during the process of nitrogen and carbon ion implantation; however, titanium was not detected by XPS after the implantation.