Surface Modification of Materials

  • T. G. Lindsay
  • G. S. Tough

Summary

The boronizing of steels, nickel and radiometal by the pack method was carried out in a muffle furnace at temperatures between 800 and 1000°C to determine if the hard layer formed met the criterion of wear resistance for conical self-acting gas bearings produced by Ferranti PLC. On steels, an Fe2B layer of HV0.1 1500 kg/mm2 was formed, usually with some (unwanted) FeB on the outer surface. This was easily removed by a vacuum anneal, again at temperatures between 800 and 1000°C, and, if carried out on a suitable low-alloy steel, a gas quench after the anneal allowed development of the core properties without affecting either the surface hardness or adhesion. Nickel boronized in a similar manner resulted in a predominantly Ni3B layer three times thicker than that developed on plain carbon steel under identical boronizing conditions and with a hardness of HV0.1 900 kg/mm2. Radiometal also boronized easily with a layer hardness of HV0.1 850 kg/mm2. Wear resistance trials are still in progress.

Keywords

Medium Carbon Steel Plain Carbon Steel Boride Layer Iron Boride Nickel Boride 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1986

Authors and Affiliations

  • T. G. Lindsay
    • 1
  • G. S. Tough
    • 1
  1. 1.Napier CollegeEdinburghUK

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