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P for steel cutting grades 2 k for cast iron cutting

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Unformatted text preview: ades P Ferrous Materials P-01, P-10, P-20, P30, P-40, P-50 M Intermediates M-10, M-20, M-30, M-40 K Non-ferrous materials, Cast Iron K-01, K-10, K-20, K-30, K-40 Major Classes of Tool Materials Coated carbides Coating reduces the tendency of a carbide tool to crater. Coating Each coating ranges from 2 to 10 microns. The usual coatings are from TiC, TiN and A12O3. Multi-layer scheme • TiC & Ti (CN) resistant to abrasion • TiN high lubricity - resists B.U.E • Al2O3 good insulator good - resists cratering and - chemically inert Major Classes of Tool Materials Coated carbides Coatings may be applied by sputtering or other physical deposition Coatings techniques. Better bonding is realized by chemical vapours deposition where vapours such as TiCl4 and methane are reached on the hot tool surface at 650 C or higher to produce the coating. The layer next to the carbide substrate is TiC which provides a stable diffusion barrier to prevent carbon leaving the substrate, or iron from entering the cobalt phase. The outer layer is TiN to provide low interface friction. Major Classes of Tool Materials 5. Cermet Tools 5. • • • • • • ...
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