Abstract
Alternatives to the endothermic generator process of gas carburizing are surveyed. In methanol-nitrogen-systems it is shown that important properties of carburizing atmospheres such as carbon transfer coefficient, carbon availability and buffer effect decrease rapidly with increasing nitrogen content. Also the controllability of carbon potential by dewpoint, CO2 or oxygen potential is adversely affected. If the nitrogen content is high the controllability of the carbon potential can only be assured by a large and uniform excess of carrier gas. The best carburizing properties are attained by an atmosphere formed by cracked methanol and ethylacetate or acetone as carburizers. By adapting the composition of the carburizer and carrier gas according to the described methanolnitrogen process it is possible to reduce the necessary flow rate of carrier gas. In this case the carrier gas has to maintain only a slight positive pressure and thereby a large amount of gas can be saved whilst good carburizing properties and controllability of the atmosphere are assured.
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