固体渗碳时,渗碳箱的封口过去我们也用钢板盖泥封法,由于钢板变形,封口泥经常干裂和脱落,造成漏气。后来我们摸索采用粘土焦炭粉覆盖法密封渗碳箱,取得了良好的效果,其方法是:工件装箱后至箱口留下30公分空位,将70％的粘土和30％焦炭粉(80～100目)用水拌 Solid carburizing, carburizing box sealing past, we also use the steel lid mud seal method, due to deformation of steel, sealing mud often dry crack and fall off, resulting in leaks. Later, we explored the use of clay coke powder sealing method to seal the carburizing box, and achieved good results, the method is: the workpiece packing box leaving 30 cm empty seat, 70% of the coke and 30% coke powder (80 ~ 100 mesh) with water