8
A. Patil et al.
Si 3 N 4 ball under a normal load of 1 N and at a fixed speed of 20 mm/s. The test
was performed to a total sliding distance of 140 m to achieve steady-state friction
behavior, the micrographs were obtained to investigate the wear phenomena and to
observe the features of the wear tracks.
Results and Discussion
X-Ray Diffraction (XRD) Analysis
XRD pattern of SPS processed pure nickel, and Ni-Ti-C composites is shown in
Fig. 1. Peaks corresponding to (111), (200), and (220) FCC nickel; (111), (200),
(220), (311) titanium carbide; hcp (0002) C are the only peaks observed; indicating
that nickel, titanium carbide, and graphite are the only principle phases present in
the Ni-Ti-C composites, and no undesired intermetallic phases are present in it [33].
The absence of any peaks corresponding to NiTi intermetallic phase shows no reaction between nickel and titanium. The presence of characteristic peaks of titanium
carbide phase indicates that titanium and graphite have undergone an in situ reaction forming titanium carbide (TiC). Higher intensity of titanium carbide peak was
observed particularly for Ni-10Ti-10C composites, which indicates the presence of
a higher volume fraction of titanium carbide precipitates in comparison with other
Ni-Ti-C nanocomposites. Also, in XRD analyses, the presence of hcp (0002) carbon
Fig. 1 XRD pattern of pure nickel and Ni-Ti-C composites. (Color figure online)
A. Patil et al.
Si 3 N 4 ball under a normal load of 1 N and at a fixed speed of 20 mm/s. The test
was performed to a total sliding distance of 140 m to achieve steady-state friction
behavior, the micrographs were obtained to investigate the wear phenomena and to
observe the features of the wear tracks.
Results and Discussion
X-Ray Diffraction (XRD) Analysis
XRD pattern of SPS processed pure nickel, and Ni-Ti-C composites is shown in
Fig. 1. Peaks corresponding to (111), (200), and (220) FCC nickel; (111), (200),
(220), (311) titanium carbide; hcp (0002) C are the only peaks observed; indicating
that nickel, titanium carbide, and graphite are the only principle phases present in
the Ni-Ti-C composites, and no undesired intermetallic phases are present in it [33].
The absence of any peaks corresponding to NiTi intermetallic phase shows no reaction between nickel and titanium. The presence of characteristic peaks of titanium
carbide phase indicates that titanium and graphite have undergone an in situ reaction forming titanium carbide (TiC). Higher intensity of titanium carbide peak was
observed particularly for Ni-10Ti-10C composites, which indicates the presence of
a higher volume fraction of titanium carbide precipitates in comparison with other
Ni-Ti-C nanocomposites. Also, in XRD analyses, the presence of hcp (0002) carbon
Fig. 1 XRD pattern of pure nickel and Ni-Ti-C composites. (Color figure online)