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Surface treatment of steels: Borudif, a new boriding process

Authors
Journal
Thin Solid Films
0040-6090
Publisher
Elsevier
Publication Date
Volume
78
Issue
1
Identifiers
DOI: 10.1016/0040-6090(81)90418-1
Disciplines
  • Economics

Abstract

Abstract The present study concerns the development of a new pack-boriding process which is simple, economical, original and industrially reliable. Three agents essential for the formation of satisfactory boride surface layers have been defined: an activator (BF 3 gas), an oxide moderator (silica: acid-washed sand) and a boriding agent (finely powdered boron carbide diluted with SiC). In the laboratory and industrial reactors, the BF 3 gas passes first through silica ( T > 450 °C) and then through a layer of boron carbide containing the samples (900 < T < 1100 °C). Gaseous phase boriding is also possible with the same reactants; the samples are placed immediately after the boron carbide layer, either directly in the gas stream or in a bed of SiC. The results obtained on carbon steels are satisfactory (single-phase acicular Fe 2B). The boride layer also adheres well to high chromium steels but unsatisfactory results are obtained with very highly alloyed steels such as 18-10 stainless steel.

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