EFFECT OF NICKEL CONTENT ON THE BORONISING BEHAVIOUR OF PERMALLOYS


UÇAR N. , IYI O., CALIK A. , Karakas M. S.

OXIDATION COMMUNICATIONS, vol.38, no.2, pp.748-755, 2015 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 38 Issue: 2
  • Publication Date: 2015
  • Title of Journal : OXIDATION COMMUNICATIONS
  • Page Numbers: pp.748-755

Abstract

Permalloys with nickel contents ranging from 60 to 90% were boronised in a solid medium using the powder pack method. In this method, commercial Ekabor-II powders were thoroughly mixed with ferro-silicon powders to form the boronising medium. The samples were boronised in an electrical resistance furnace for 5 h at 1173 K under atmospheric pressure. The results showed that borosilicide and boride layers were formed on the surface of boronised permalloys, with average hardness of 900-1000 HV0.1. The average thickness of the multilayer coating was 90 mu m, and did not show significant change with Ni content within the range studied. The saw-tooth morphology of the boride layers were smoothened with increasing nickel content.