Niobium boride coating on AISI M2 steel by boro-niobizing treatment

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Şen U., Pazarlıoğlu S. S., Şen Ş.

MATERIALS LETTERS, vol.62, pp.2444-2446, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 62
  • Publication Date: 2008
  • Doi Number: 10.1016/j.matlet.2007.12.042
  • Journal Name: MATERIALS LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2444-2446
  • Keywords: Borides, thermo-reactive deposition, niobium boride, AISI M2 steel, REACTIVE DEPOSITION TECHNIQUE, CHROMIUM CARBIDE, PURE NIOBIUM, STEEL, KINETICS, BEHAVIOR, GROWTH, LAYERS, NBB2
  • Open Archive Collection: AVESIS Open Access Collection
  • Marmara University Affiliated: No

Abstract

In this study, niobium boride coating was applied on pre-boronized AISI M2 steel by the thermo-reactive deposition technique in a powder mixture consisting of ferro-niobium, ammonium chloride and alumina at 950 degrees C for 1-4 h. The coated samples were characterized by X-ray diffraction, scanning electron microscope and micro-hardness tests. Niobium boride layer formed on the pre-boronized AISI M2 steel was smooth, compact and homogeneous. X-ray studies showed that the phases formed on the steel surfaces are NbB, Nb(3)B(2), FeB and Fe(2)B. The depth of the niobium boride layer ranged from 0.97 mu m to 3.25 mu m, depending on treatment time. The higher the treatment time the thicker the niobium boride layer observed. The hardness of the niobium boride layer was 2738 +/- 353 HV(0.01). (c) 2008 Elsevier B.V. All rights reserved.