ガス軟窒化処理の新手法について

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(1) Appropriate selection of nitrogen pontential and treating temperature pattern during the treatment enables saving of NH3 amount and shortening of treating time. (Fig. 17)(2) The dissociation reaction of NH3, Boudouards reaction, CO+H2→H2O+C, are dominant chemical reactions in the furnace chamber during the treatment and progress of the water gas reaction is slow.(3) The dissociation reaction of NH3 progresses depending not upon (NH3/RX) ratio, but only upon treating temperature (T°K) and time (t hr). The dissociation of NH3 (α%) can be represented as the following experimental formula. α=2.36×1012exp(-21566/T)(1-0.25log t)(4) Boudouards reaction does not depend on (NH3/RX) ratio, treating temperature and time. The dissociation of CO (β%) in the furnace chamber is almost constant and it becomes β=20%.(5) The change of nitrogen potential during treatment gives influence on thickness of compound layer and case hardness after a certain incubation period that corresponds with depth below surface.
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