The dry sliding wear behaviour of titanium (Grade 5) alloy has been investigated in order to highlight the mechanisms responsible for the poor wear resistance under different applied normal load, sliding speed, and sliding distance conditions. Design of experimental technique, that is, response surface methodology (RSM), has been used to accomplish the objective of the experimental study. The experimental plan for three factors at three levels using face-centre central composite design (CCD) has been employed. The results indicated that the specific wear rate increases with an increase in the applied normal load and sliding speed. However, it decreases with an increase in the sliding distance and a decrease in the sliding speed. The worn surfaces of the titanium alloy specimens were analyzed with the help of scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) techniques. The predicted result also shows the close agreement with the experimental results and hence the developed models could be used for prediction of wear behaviour satisfactorily.

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An experimental study has been carried out to investigate the mechanical and tribological characteristics of chopped carbon fiber (CCF) reinforced epoxy composites filled with nano-Al 2 O 3 particulates, as a function of fiber and filler contents. The experiments were conducted using a pin-on-disc wear test apparatus under dry sliding conditions. The coefficient of friction and specific wear rate of these composites was determined as a function of applied normal load, sliding velocity, sliding distance, and reinforcement content. The tensile, flexural, and compression strengths of ortho cresol novalac epoxy and chopped carbon fiber (OCNE/CCF) filled composites are found to be within the ranges of MPa. Whereas the tensile, flexural, and compression strengths of OCNE/ CCF/Al 2 O 3 -filled composites are found to be within the ranges of [96][97][98][99][100][101][102][103][104][105][106][107][108][109][110] MPa, respectively. It has been observed that the coefficient of friction decreases and specific wear rate increases with increase in the applied normal loads. Further increases in the fiber (6 wt%) and particle (3 wt%) contents in the epoxy matrix resulted in a decrease of both the mechanical and tribological properties, but remains above that of the CCF reinforced epoxy composites. The worn surfaces of composites were examined with scanning electron microscopy equipped with energy dispersion X-ray analyzer and X-ray diffraction analysis technique to investigate the wear mechanisms.

In this work, ortho cresol novalac resin was synthesized in the laboratory and this synthesized resin was further reacted with epichlorohydrin to obtain ortho cresol novalac epoxy resin (OCNE). The obtained resin can be characterized by FTIR analysis. The OCNE-based composites were produced by filling the nano-SiC particulates. To explore the mechanical and tribological characteristics of these composites under dry sliding conditions, the effects of nanoparticles on the mechanical, friction, and wear properties of the OCNE composites filled with 1-4 wt% of SiC particulates (40 nm) were evaluated using a pin-on-disk apparatus. The improvement in the mechanical and wear properties was attributed to high strength, high hardness, and good dispersion of nano-SiC particulates, which can enhance the interfacial properties of nanofiller and the epoxy matrix. The lowest coefficient of friction and the specific wear rate of composites were 0.27 and 2.18 × 10 −08 mm 3 /Nm, respectively. A positive synergetic effect was also found, and the proposed quaternary composites might be applicable in practice. The wear mechanisms of these composite specimens were examined with the help of a scanning electron microscope equipped with an energy dispersive x-ray analyzer and an x-ray diffractometer . C 2014 Wiley Periodicals, Inc. Adv Polym Technol 2015, 34, 21491; View this article online at wileyonlinelibrary.com.

In the present work, the synthesized ortho cresol novalac epoxy-based composites were produced by filling the microsize silicon carbide and aluminum oxide filler particulates. The friction and wear behaviour of these composites were carried out by a pin on disc apparatus at applied normal load of 10 N to 40 N and sliding velocity of 0.9 m/s, 1.8 m/s, 2.7 m/s and 3.6 m/s under dry sliding conditions. It was found that the microsize silicon carbide and aluminum oxide filler particulates contributed significantly to improve the mechanical properties, friction and wear resistance of the ortho cresol novalac epoxy. The coefficient of friction decreases and specific wear rate increases with an increase in the applied normal load. The mechanical properties such as hardness, tensile and flexural strength increases with an increase in the filler content from 0 wt% to 10 wt% and decreases with the filler content of 15 wt%. On the other hand, compression strength increases with an increase in the filler content from 0 wt% to 15 wt%, respectively. It was also seen that the composites filled with 10 wt% (silicon carbide and aluminum oxide) filler exhibit the better mechanical and tribological properties.