高性能气体渗碳炉的研发

Development of High Performance Gas Carburising Furnace

为了克服气体渗碳炉的固有缺点,研发了一种高性能气体渗碳炉(N-BBH)。通过在密封的加热室里面使用少量载气体并精确控制渗碳过程中的气氛,该渗碳炉可以减少90%以上的CO2排放量。开炉时空气不会进入加热室和前室,因此不需要额外的调节时间。由于有高的碳传递系数(β)和高的碳势(Cp),渗碳速度比低压渗碳的渗碳速度更高。与常规气体渗碳相比,通过减少如CO2、O2和H2O等氧化物含量,并采用氮气或者高碳势气氛,至少可以减少50%的晶界氧化。

We developed a high performance gas carburising furnace（ N-BBH） to overcome the inherent disadvantages of gas carburising furnaces. More than 90% reduction in CO2 emission was achieved using a small amount of carrier gas in the air tight heating chamber and by precise control of the atmosphere during carburising.No conditioning time was required because the air does not enter either the heating chamber or the pre-chamber when opening the furnace. Carburising speed was higher than that of low pressure carburising because of a high carbon transfer coefficient（ b） and high carbon potential（ Cp）. Decreasing the oxidation components,such as CO2,O2 and H2O,and using nitrogen gas or atmospheric gas with high Cp reduced intergranular oxidation 50% or more compared with conventional gas carburising.