真空渗氮

真空渗氮vacuum nitriding

真空渗氮工艺指向真空炉中通入氨气,可对工件进行真空渗氮,其方式类似于脉冲式真空渗碳,即工件装人真空炉后开始抽气,当真空度达到设定值后,炉子通电升温,同时抽真空,以保持炉子的真空度。炉温达到渗氮温度时,保温一段时间,其作用是净化工件表面和透烧。其后停止抽真空并向炉内通人渗氮气体,使炉压升高至一定值,保持一段时间,之后再抽真空并保持段时间,再通入渗氮气; 如此,反复进行多次,直到渗氮层深达到要求为止。在此全过程中炉温保持不变。

The vacuum nitriding process points to the ammonia gas into the vacuum furnace, which can vacuum nitrogen the workpiece, which is similar to the pulse vacuum carburization, that is, the workpiece is installed in the vacuum furnace. When the vacuum degree reaches the set value, the furnace is energized and heated up at the same time to maintain the vacuum degree of the furnace. When the furnace temperature reaches the nitrogen temperature, the insulation for a period of time is to purify the surface of the workpiece and permeable. Then stop the vacuum and fill the nitrogen gas into the furnace, raise the furnace pressure to a certain value for a period of time, then vacuum and maintain for a period of time, then into the nitrogen gas; repeatedly until the depth reaches the requirement. The furnace temperature remains the same throughout the whole .

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