With increase of heating temperature and duration of heating time, the depth and concentration of phosphorous-enriched layer in uphill diffusion increases continuously.
随着提高加热温度和延长保温时间，“上坡扩散”的富磷层深度和浓度将不断增加。
Due to its proximity effect and skin effect, induction heating is only the workpiece near the outer skin penetration depth of a layer of fixed value of the direct heating, internal heating is small;
由于邻近效应和集肤效应的影响，感应加热时只是工件中靠近外表皮透入深度为定值的一层直接发热，内部发热很少；
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