一、概述渗碳或碳氮共渗用炉气氛的制备通常是在碳挚较低的基本气体或载体气内添加其它气体,一般为丙烷、甲烷或其它适当的C-H或C-H-O化合物。选择载体气最佳最低量的依据是,能保证安全可靠的装料操作并且炉内保持有足够大的余压,以防止二次空气渗入。这一气体量在操作过程中一般不再改变。反之,添加气体的数量应适应碳势和工件表面的不同要求而进行调节。 I. INTRODUCTION The carburizing or carbonitriding furnace atmosphere is usually prepared by adding other gases, typically propane, methane or other suitable C-H or C-H-O compounds, to a lower base gas or carrier gas. The basis for choosing the optimum minimum amount of carrier gas is to ensure safe and reliable charging operations and sufficient residual pressure in the furnace to prevent secondary air ingress. This amount of gas generally does not change during operation. Conversely, the amount of gas added should be adjusted to the different requirements of the carbon potential and the surface of the workpiece.