Standard entropy of formation of Mo2B5 at 298K

Morishita, Masao; Kôyama, Kôichirô; Yagi, S.

doi:10.1016/j.jallcom.2003.12.028

Cited by 4 publications

(1 citation statement)

References 15 publications

(22 reference statements)

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“…17 Furthermore, they are used as a protective coating (where the MoB x constitutes as much as 70% of the whole composition) due to their outstanding resistance to oxidation and corrosion in molten aluminium, zinc and their alloys). 8,[18][19][20] Synthesis of molybdenum borides has been explored in the past by various means, such as spark plasma sintering, 6 solid state reaction, 7 pack boriding, 6,21 selfpropagating high temperature synthesis, 22 mechanochemical synthesis, 1,23 volume combustion synthesis, 24 aluminium metal flux technique, 25 Ar arc melting, 26 multiphase reaction diffusion in a salt bath, 13 and electrochemical boriding. 12,13,27,28 Of these, electrochemical boriding in molten salts appeared to give the most desirable forms of boride layers in the shortest duration.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical boriding of molybdenum in molten borax

Kahvecioğlu¹,

Sista²,

Eryilmaz³

et al. 2015

Surface Engineering

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In this study, molybdenum plates (99?5% purity) were subjected to electrochemical boriding in a molten borax electrolyte in order to synthesise molybdenum boride phases on exposed surfaces. Electrochemical boriding was carried out at temperatures of 900, 950 and 1000uC for a duration of 30-180 min at a current density of 0?5 A cm 22 . Cross-sectional microscopic examination of the plates indicated formation of 20 to 50 mm thick boride layers, depending on process temperature and duration. These layers consisted of two distinct boride phases: Mo 2 B 4?027 and Mo 2 B 5 . The boride layer cross-sectional hardness was in the range of 1900-3250 HV with 50 g load. The adhesion of the boride coating to the molybdenum substrate was determined by a Rockwell C indentation adhesion test machine. The boride layers produced due to the electrochemical boriding technique were thick, hard, dense, and homogeneous.

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