气体渗碳时,排气阶段的好坏对渗碳质量的好坏和时间的长短有很大影响。不少单位采用扩大排气孔、加长排气烟囟、大量滴入乙醇等方法来加速排气,可是效果并不很好。在生产中采用在试样孔上放一根排气烟囟的方法,可是由于废气管和空气是连通的,使得空气由废气管进入炉内,再由排气烟囟排出。这样排气时间长。只要将废气管关死或做一闷头旋在废气管上 Gas carburizing, the stage of the quality of the quality of the quality of the carburization and the length of time has a great impact. Many units to expand the vent, longer exhaust chimney, a large number of drops of ethanol and other methods to accelerate the exhaust, but the effect is not very good. In production, the method of placing an exhaust chimney on the sample hole is adopted. However, since the exhaust pipe and the air are communicated, the air enters the furnace through the exhaust pipe and is discharged by the exhaust chimney. This exhaust a long time. As long as the exhaust pipe shut down or do a stuffy head spin on the exhaust pipe