| Autor: |
Lakhtin, Yu. M., Kogan, Ya. D., Shaposhnikov, V. N. |
| Zdroj: |
Metal Science and Heat Treatment; June 1976, Vol. 18 Issue: 6 p475-479, 5p |
| Abstrakt: |
1.The gasdynamic and energetic parameters of discharge in ion nitriding of steel were optimized.2.The structure and phase composition of the diffusion layer can be controlled by changing the pressure and the composition of the saturating atmosphere.3.In ammonia plasma the depth of the diffusion layer is largest on commercial iron and steels 40Kh and 38KhMYuA at a pressure of 2 mm Hg at temperatures of 520–570° and at 6 mm Hg at 650°.4.The addition of argon to ammonia plasma makes it possible to obtain a nitrided layer on a base of high-nitrogen a solid solution. Nitriding in mixtures with 5–15% NH3 and 95–85 vol. % Ar at pressures of 0.3–0.6 mm Hg provide a depth 50% larger than nitriding in ammonia plasma.5.Nitriding in a mixture of ammonia and carbon-containing gas increases the depth of the nitride zone. With 40 vol. % or more propane in the mixture the interaction of the plasma with the surface of the part ceases. The optimal concentration of propane in the mixture with ammonia is 8–12 vol. %. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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