工业纯铁的氮碳钛离子共渗工艺

Process of ion nitro-carbon titanizing for industrial pure iron

针对氮、碳二元离子共渗电磁纯铁的渗氮层硬度低、耐磨性差的问题,采用氮、碳、钛三元离子共渗的方法对其进行表面改性处理。结果表明,在相同渗氮工艺下,海绵钛的加入,有效地提高了渗氮层的表面硬度;在520℃共渗8 h时,测得渗层硬度最高可达513 HV0.05。但是三元离子共渗降低了纯铁的磁性能,尤以低磁性能降低较多,稍低于GB/T 3656—2008要求,中磁性能与高磁性能仍满足标准要求。

Aiming at the problem of low hardness and poor wear resistance of nitrided layer of the electromagnetic pure iron treated by the binary ion nitrocarburizing, the surface modification treatment of ion nitro-carbon titanizing was carried out. The results show that under the same nitriding process, the surface hardness of nitrided layer is increased effectively due to the addition of titanium sponge. After nitriding at 520 ℃ for 8 h, the measured hardness of the nitrided layer is up to 513 HV0.05. But ternary ion nitro-carbon titanizing decreases the magnetic properties of pure iron, especially low magnetic properties, which is lower than the requirements of GB/T 3656—2008, and the medium and high magnetic properties still meet the requirements of the standard.