“…Nitrogen afterglow can be used for steel surface nitriding (Ricard et al, 1990;Bougdira et al, 1991). Also nitrogen plasmas could be used to create carbon nitrides (Han and Feldman, 1988;Niu et al, 19931, very hard materials that have been shown to have excellent tribological properties (Chen et al, 1992). There is also interest in the use of nitrogen plasmas to create nanoparticles of structural ceramics, such as aluminum nitride (David et al, 1990) and silicon nitride (Anderson et al, 1989;Lee et al, 1990).…”