| 摘要 |
<p>Carrier gases formed by the reaction of rich mixtures of hydrocarbon and air and heretofore considered unsuitable for gas carburizing can be used for gas carburizing if introduced into the heat treamtment chamber (4) at or below a specified flow rate. This flow rate is inversely proportional to the amount of CO2 and H2O present in the carrier gas and can be increased by, for example, removing H2O from the gas. The invention has particular commercial value since it enables exothermic gas generators (8) to be used for providing carrier gas for gas carburizing with excellent control of the carbon potential by monitoring the reacted furnace atmosphere and making hydrocarbon additions in the usual way. Three forms of apparatus are also described which may be used for producing suitable carrier gases in the heat treatment chamber (4) itself.</p> |
