Synthesis of protective Mo-Si-B coatings in molten salts and their oxidation behavior in an air-water mixture

S.A. Kuznetsov; E.V. Rebrov; M.J.M. Mies; M.H.J.M. Croon, de; J.C. Schouten

doi:10.1016/j.surfcoat.2006.01.003

Synthesis of protective Mo-Si-B coatings in molten salts and their oxidation behavior in an air-water mixture

S.A. Kuznetsov, E.V. Rebrov, M.J.M. Mies, M.H.J.M. Croon, de, J.C. Schouten

Chemical Reactor Engineering

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Abstract

Abstract The formation of various phases during boronizing of silicided molybdenum substrates (MoSi2/Mo) was investigated. Boronizing treatments were conducted in molten salts under an inert gas atmosphere in the 700–1000 °C temperature range for 3–7 h. Depending on the process type (non-current or electrochemical) and molten salt temperature, the formation of different boride phases (MoB, Mo2B5, MoB2, MoB4) was observed. At the same time, substantial oxidation of the bulk molybdenum disilicide phase (MoSi2) to the Mo5Si3 phase was observed in non-current boronizing. The oxidation resistance of the coatings was investigated by the weight change in an air–water (2.3 vol.%) mixture at a temperature of 500 °C for a period up to 700 h. Results indicated that a two-phase microstructure consisting of the MoSi2 matrix phase with 12–15 wt.% of the MoB4 phase greatly improved the oxidation resistance of the molybdenum substrates. The weight gain rate observed was 6.5 · 10- 4 mg/cm2 h. Keywords: Electrochemical deposition; MoSi2; Molten salts; Molybdenum; Boronizing; Oxidation resistance

Original language	English
Pages (from-to)	971-978
Journal	Surface and Coatings Technology
Volume	201
Issue number	3-4
DOIs	https://doi.org/10.1016/j.surfcoat.2006.01.003
Publication status	Published - 2006

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@article{bb6a0a3d994b40d9888ec30df46b675d,

title = "Synthesis of protective Mo-Si-B coatings in molten salts and their oxidation behavior in an air-water mixture",

abstract = "Abstract The formation of various phases during boronizing of silicided molybdenum substrates (MoSi2/Mo) was investigated. Boronizing treatments were conducted in molten salts under an inert gas atmosphere in the 700–1000 °C temperature range for 3–7 h. Depending on the process type (non-current or electrochemical) and molten salt temperature, the formation of different boride phases (MoB, Mo2B5, MoB2, MoB4) was observed. At the same time, substantial oxidation of the bulk molybdenum disilicide phase (MoSi2) to the Mo5Si3 phase was observed in non-current boronizing. The oxidation resistance of the coatings was investigated by the weight change in an air–water (2.3 vol.%) mixture at a temperature of 500 °C for a period up to 700 h. Results indicated that a two-phase microstructure consisting of the MoSi2 matrix phase with 12–15 wt.% of the MoB4 phase greatly improved the oxidation resistance of the molybdenum substrates. The weight gain rate observed was 6.5 · 10- 4 mg/cm2 h. Keywords: Electrochemical deposition; MoSi2; Molten salts; Molybdenum; Boronizing; Oxidation resistance",

author = "S.A. Kuznetsov and E.V. Rebrov and M.J.M. Mies and {Croon, de}, M.H.J.M. and J.C. Schouten",

year = "2006",

doi = "10.1016/j.surfcoat.2006.01.003",

language = "English",

volume = "201",

pages = "971--978",

journal = "Surface and Coatings Technology",

issn = "0257-8972",

publisher = "Elsevier B.V.",

number = "3-4",

}

TY - JOUR

T1 - Synthesis of protective Mo-Si-B coatings in molten salts and their oxidation behavior in an air-water mixture

AU - Kuznetsov, S.A.

AU - Rebrov, E.V.

AU - Mies, M.J.M.

AU - Croon, de, M.H.J.M.

AU - Schouten, J.C.

PY - 2006

Y1 - 2006

N2 - Abstract The formation of various phases during boronizing of silicided molybdenum substrates (MoSi2/Mo) was investigated. Boronizing treatments were conducted in molten salts under an inert gas atmosphere in the 700–1000 °C temperature range for 3–7 h. Depending on the process type (non-current or electrochemical) and molten salt temperature, the formation of different boride phases (MoB, Mo2B5, MoB2, MoB4) was observed. At the same time, substantial oxidation of the bulk molybdenum disilicide phase (MoSi2) to the Mo5Si3 phase was observed in non-current boronizing. The oxidation resistance of the coatings was investigated by the weight change in an air–water (2.3 vol.%) mixture at a temperature of 500 °C for a period up to 700 h. Results indicated that a two-phase microstructure consisting of the MoSi2 matrix phase with 12–15 wt.% of the MoB4 phase greatly improved the oxidation resistance of the molybdenum substrates. The weight gain rate observed was 6.5 · 10- 4 mg/cm2 h. Keywords: Electrochemical deposition; MoSi2; Molten salts; Molybdenum; Boronizing; Oxidation resistance

AB - Abstract The formation of various phases during boronizing of silicided molybdenum substrates (MoSi2/Mo) was investigated. Boronizing treatments were conducted in molten salts under an inert gas atmosphere in the 700–1000 °C temperature range for 3–7 h. Depending on the process type (non-current or electrochemical) and molten salt temperature, the formation of different boride phases (MoB, Mo2B5, MoB2, MoB4) was observed. At the same time, substantial oxidation of the bulk molybdenum disilicide phase (MoSi2) to the Mo5Si3 phase was observed in non-current boronizing. The oxidation resistance of the coatings was investigated by the weight change in an air–water (2.3 vol.%) mixture at a temperature of 500 °C for a period up to 700 h. Results indicated that a two-phase microstructure consisting of the MoSi2 matrix phase with 12–15 wt.% of the MoB4 phase greatly improved the oxidation resistance of the molybdenum substrates. The weight gain rate observed was 6.5 · 10- 4 mg/cm2 h. Keywords: Electrochemical deposition; MoSi2; Molten salts; Molybdenum; Boronizing; Oxidation resistance

U2 - 10.1016/j.surfcoat.2006.01.003

DO - 10.1016/j.surfcoat.2006.01.003

M3 - Article

SN - 0257-8972

VL - 201

SP - 971

EP - 978

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

IS - 3-4

ER -

Synthesis of protective Mo-Si-B coatings in molten salts and their oxidation behavior in an air-water mixture

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