Thermochemical Treatments for Protection of Steels in Chemically Aggressive Atmospheres at High Temperatures

Τσιπάς, Δ.; Triantafyllidis, Georgios; Kipkemoi, J.; Flitris, Y.

doi:10.1080/10426919908914863

Cited by 14 publications

(2 citation statements)

References 17 publications

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“…aluminizing, chromizing (Kingel et al , 1995; Pérez et al , 1999; Tsipas and Flitris, 2000), nitriding (Japka, 1983; Reynoldson, 1993), carburizing and carbonitriding (Reynoldson, 1993). On the other hand very limited information exists on boride coatings obtained using FBT, although this method is simple, efficient, environment friendly and the boride coatings have been reported to have an excellent combination of properties (Anil Kumar Sinha, 1997; Arai et al , 1986; Tsipas et al , 1999). The theory of fluidization is described in great detail elsewhere (Gupta and Sathiyamoothy, 1999; Howard, 1989).…”

Section: Introductionmentioning

confidence: 99%

Characterization and tribological properties of boride coatings of steels in a fluidized bed reactor

David

Anthymidis

Agrianidis

et al. 2008

Industrial Lubrication and Tribology

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PurposeThe aim of the current research is to characterize boride coatings on steels and steel alloys produced in a CVD fluidized bed reactor.Design/methodology/approachHeat treatments of alloys in fluidized bed reactors have been carried out for more than 25 years. Recently, this technology has been used for surface engineering applications in the deposition of hard and/or corrosion‐resistant layers. The present paper used fluidized bed technology (FBT) to deposit boride coatings on to ferrous materials. The coatings were examined by means of optical microscopy, Vickers microhardness measurements and X‐ray diffraction in terms of coating thickness and morphology, phase formation and hardness determination. The coating's tribological properties were evaluated under dry wear. Impact tests were also carried out to determine the fatigue resistance of the examined coatings under dynamic impact loading.FindingsBoriding in a fluidized bed reactor is a simple, environmentally friendly and fast‐coating process. The produced iron‐boride coatings are characterized by excellent quality and uniform tooth‐shaped morphology. Fe2B was the predominant boride phase formed, exhibiting superior tribological properties under dry wear conditions. Impact testing investigations revealed high‐fatigue strength of boride coatings in combination with limited deformable substrates.Research limitations/implicationsThe investigated coatings were deposited only on some structural and tool steel substrates.Practical implicationsBoride coatings deposited using FBT are satisfactory abrasive wear‐ and fatigue‐resistant coatings in comparison with those produced using common boride coating methods.Originality/valueThe outcome of the research is of great importance for the industry using abrasive wear coatings.

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Section: Introductionmentioning

confidence: 99%

Characterization and tribological properties of boride coatings of steels in a fluidized bed reactor

David

Anthymidis

Agrianidis

et al. 2008

Industrial Lubrication and Tribology

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“…The boronized steels have an excellent wear resistance [10][11][12][13][14]. Furthermore, these materials exhibit a good resistance to chemical attack by molten metals, nonoxidizing acids, alkaline and saline solutions [15][16][17][18]. Industrial applications of boronized steel include drive shafts, camshafts, pulleys, machine slide-ways, tanks, *Corresponding author: tel.…”

Section: Introductionmentioning

confidence: 99%

Oxidation stability of boride coatings

Ptačinová¹,

Drienovský²,

Palcut³

et al. 2016

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In this work, plain, low carbon steel S235JRG1 was boronized at 1273 K for 45-150 min by using a Durborid powder. The microstructure, phase constitution and oxidation behavior of the resulting boride layers have been investigated. Layers with an average thickness of 76-123 µm have been produced. The boride layer has a distinct tooth-like microstructure. It is composed of Fe2B and FeB in unequal amounts. The boride layer oxidation behavior has been investigated by a simultaneous thermal analysis in a flowing synthetic air at 873-1173 K for 21-24 h. A parabolic oxidation of the boride layer has been observed. The rate constants are found between 1.039 × 10 −9 to 3.781 × 10 −6 kg 2 m −4 s −1 , depending on temperature and oxidation time. The activation energy of oxidation at temperatures below 1173 K has been estimated to be 93 kJ mol −1 . At 1173 K, two successive parabolic periods have been found, followed by a breakaway oxidation behavior. The oxide scale of the boronized steel is composed of different iron oxides and iron borates. The oxidation mechanisms of boride coatings are discussed and implications towards high temperature stability are provided.K e y w o r d s : boronizing, high temperature oxidation, X-ray diffraction, thermogravimetric analysis

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Coatings and linings

Rockel

Bender

2008

Corrosion Handbook

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Thermochemical Treatments for Protection of Steels in Chemically Aggressive Atmospheres at High Temperatures

Cited by 14 publications

References 17 publications

Characterization and tribological properties of boride coatings of steels in a fluidized bed reactor

Characterization and tribological properties of boride coatings of steels in a fluidized bed reactor

Oxidation stability of boride coatings

Coatings and linings

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