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| Paper IPM / Physic / 8582 |
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| Abstract: | |||||||
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DC glow discharge is most widely used in plasma thermochemical
processes such as diffusive ion nitriding/carburizing. Gamma-based
titanium aluminides were plasma nitrided or air oxidized to compare
the surface modifications arising from these treatments. The
screened samples were investigated to compare the effect of these
treatments. The phases and microstructures formed within the treated
surface layers were characterized using X-ray diffraction (XRD),
glow discharge spectroscopy (GDS), and optical and scanning electron
microscopy. The compound layers consisted of TiN and Ti2AlN in
nitrided samples, and TiO2 and Al2O3 in oxidized
samples. The wear resistance of the surface-treated samples
increased considerably against ball bearing steel (AISI 52100). The
overall effect of oxidizing treatment was as good as plasma
nitriding.
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