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Jitai Han,Meiping Wu,Weipeng Duan 한국고분자학회 2020 폴리머 Vol.44 No.5
In this study, a way to reinforce the properties of ultrahigh molecular weight polyethylene (UHMWPE)/vitamin E (VE) nanocomposites was put to use by adding graphene oxide (GO) combined with gamma-ray irradiation cross-linking. The influences of adding GO and irradiation cross-linking treatment on the thermal and mechanical properties were studied, especially the effect of GO doping on irradiation cross-linked UHMWPE/VE nanocomposites. The results show that GO filling has no significant effect on melting temperature and gel content decreased at a small degree, but the crystallinity has been improved obviously. In addition, the ball indentation hardness and scratch resistance were enhanced as well. The comprehensive effects of improved crystallinity and reduced cross-linking degree as well as the good mechanical properties of GO doping were responsible for this result.
Peipei Lu,Meiping Wu,Xin Liu,Weipeng Duan,Jitai Han 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.8
Titanium and its alloy, especially Ti6Al4V is one of the most widely used metal due to its excellent properties. Selectivelaser melting, which is known as additive manufacturing is considered as a suitable method to manufacture Ti6Al4V parts. To print a more analogous Ti6Al4V artificial bone, laser power was changed by taking volume porosity, corrosion resistanceand wear resistance into consideration. The testing results showed that sample printed using 200 W showed a relative optimalcorrosion resistance and volume porosity in all these five samples (the value of corrosion voltage is − 0.352 V), while itshowed the best bio-tribological behavior, and its wear volume is as low as 5.90 μm3. Summarize the 5 sets of experimentalsamples, the Ti6Al4V part printed using 180–200 W were the most prominent in the test, its overall performance was, indeed,best fit to print artificial Ti6Al4V bone, because it is similar to bone, there are a large number of microporous structures.