Tribological properties of nitrogen implanted boron carbide
- Conference date: 1990
- Location: Albuquerque, NM (USA)
From wear studies of nitrogen (N) implanted boron carbide, differences in how the treatment affects the coefficient of friction have been reported. DeKoven et al., found increases for a N‐implanted B4C wearing against a N‐implanted B4C disk for energies from 10 to 100 keV and doses from 5×101 7 to 101 8 N/cm2. For higher energy implants (190 keV) and doses (3×101 7 N/cm2), Natasi et al. found the coefficient of the implanted material initially similar to the unimplanted material during wear from a hardened chromium steel ball. After as few as ten passes the coefficient of friction significantly increased. More recent results for B4C (100 keV with a does of 4×101 7 N/cm2) qualitatively reduced the coefficient of friction. Here, polycrystalline B4C was N‐implanted (150 keV with a total does of 2×101 7 N2/cm.2). Following Rutherford Backscattering Spectrometry (RBS), static and kinetic coefficients of friction measured with a B4C versus beta‐titanium couple (79Ti‐11mo‐6Zr‐4Sn) indicated that coefficients were significantly reduced (p<0.001) for the implanted samples.
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