Syôitsu Seo1, Tôru Miyazaki1 and Etsujirô Yajima1
1Nagoya Institute of Technology, Nagoya
The influence of nickel on carbon potential, an important factor in the gas-carburizing, was studied at 900°C by measuring the dew-point equilibrium curve. The results obtained are as follows:
(1) Dew-point of endothermic gas is the factor which determines the carbon potential, and if the relation between the carbon potential and activity of carbon is known, the dew-point is also the factor which determines the activity of carbon.
(2) For the endothermic generator gas composed of 23%CO, 32%H2, slight H2O, CO2 and N2 at the carburizing temperature of 900°C, when the dew-point is -9°C, the activity of carbon becomes 1.
(3) The equation for the solubility change of carbon ( Δ C%) due to nickel addition is obtained as.
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