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磁性材料多由粉末压制烧结而成。粉料硬度高达HV600～700,模具损耗很大。我厂用的Cr12MoV钢偏转凹模,常规处理后硬度为HV740～790,使用半个月,型腔内出现压坑,压出的半成品易产生开裂而报废,模具改为粉末渗硼后,寿命提高14倍以上。渗硼剂选用化学纯的氟硼酸钾和绿色纯净的碳化硅,渗剂配比为KBF_47%,SiC93%,渗硼工艺如图1。模具渗硼为银白色,硬度HV_(0.05)1648,渗层深度0.09～0.11mm,渗层金相组织为单相Fe_2B。模具和渗剂装罐要密封好,防止因空气
Magnetic materials are mostly sintered by pressing powder. Powder hardness up to HV600 ~ 700, a great loss of mold. I used Cr12MoV steel deflection die, the conventional hardness of HV740 ~ 790 after treatment, the use of half a month, there cavity pressure crater, the pressure out of the semi-finished products easy to crack and scrapped, the mold changed to powder boronizing, the life Improve more than 14 times. Boronizing agent selected pure chemical pure potassium borofluoride and green pure silicon carbide, penetration agent ratio KBF_47%, SiC93%, boronizing process shown in Figure 1. The boronizing of the mold is silvery white, the hardness is HV_ (0.05) 1648, the depth of the layer is 0.09 ~ 0.11mm, and the microstructure of the layer is single phase Fe_2B. Mold and penetration agent cans sealed to prevent the air