Boronizing with powdered mixtures

Voroshnin, L. G.; Lyakhovich, L. S.; Funshtein, Ya. N.

doi:10.1007/bf00653013

Cited by 3 publications

(11 citation statements)

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“…However, the performance of boride coatings in wear and corrosion applications is significantly higher than of bare carbon and stainless steels and alloys. [25][26][27][28][29][30]32,34,[45][46][47][48][49] Therefore, it is much more beneficial in industry to use boride coatings with high corrosion resistance onto inexpensive CS.…”

Section: Experimental Starting Materials and Processingmentioning

confidence: 99%

“…Among the options of thermal diffusion methods, boronising of steels and alloys can be used to create hard and chemically inert coatings based on iron borides and some other borides, which can successfully protect metallic components from wear and corrosion at elevated temperatures. [25][26][27][28][29] As known, metal borides have a strong advantage due to their high hardness, chemical inertness and related application properties, e.g. wear and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

“…The formation of the iron boride thermal diffusion coatings has a parabolic behaviour, which is confirmed by numerous studies. [25][26][27][28][29][30]32,37,41,42 Because of this, phase formation and, particularly, case depth (coating thickness), can be managed by the modification of temperature and time.…”

Section: Introductionmentioning

confidence: 99%

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Tribological properties of boride based thermal diffusion coatings

Medvedovski¹,

Jiang²,

Robertson³

2014

Advances in Applied Ceramics

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Engineering components, e.g. tubing systems for the down-hole applications in the oil and gas industry (in particular, sucker rod pumps, progressing cavity pumps and some other components of the artificial lifting systems), as well as numerous valves and seats, bearings, gears and plungers, require protection against friction and sliding abrasion service conditions. The hard boride based coatings on steels and alloys obtained through the thermal diffusion process have a high potential for these severe application conditions over many other types of coatings as they can be obtained on the entire working surfaces of large size and complex shape products. Intensive tribological studies of the iron boride based coatings on carbon steel obtained at Endurance Technologies Inc. have been conducted using the Cameron-Plint testing unit (reciprocating sliding of the metallic rod under the load over a flat surface of the coated samples). The friction wear loss, friction coefficient and structural changes of the coatings have been studied in dry and lubricating (water-oil) friction conditions, which simulate actual application conditions. It was demonstrated that the obtained boride coatings have the friction loss significantly smaller than untreated steel (e.g. y10-30 times in the dry conditions and at least 5 times in the lubricating conditions) with no peeling and flaking-off. The friction coefficients of the boride coatings are steady over the test duration. The influence of the thickness on the boride coatings performance is demonstrated. The encouraging results are explained by the specific coating structure of the hard coating obtained through the thermal diffusion process and the thin 'tribofilm' formed during a friction mode.

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Section: Experimental Starting Materials and Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tribological properties of boride based thermal diffusion coatings

Medvedovski¹,

Jiang²,

Robertson³

2014

Advances in Applied Ceramics

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“…Boriding is one of the widespread thermochemical surface treatments used to improve service characteristics of metals, alloys and steels [1][2][3]. Iron borides Fe 2 B and FeB are known to exist in the Fe-B binary system [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…With a mixture of 30-35% B 4 C and 70-65% Na 2 B 4 O 7 and the Na 2 B 4 O 7 melt (electrolysis), appropriate thickness values are 40 µm and 55 µm, respectively. Mixtures of amorphous boron and KBF 4 appear to be more effective boriding agents due to the formation of a gas phase at elevated temperatures [1,8,11]. In this work, the results of investigation of the interaction of a commercial 13% Cr steel (40X13) and boron in a mixture of amorphous boron powder and 5% KBF 4 at 850-950 o C are presented, with the main emphasis on establishing the boride layer-growth kinetics that received comparatively little attention.…”

Section: Introductionmentioning

confidence: 99%

Diffusional Growth Kinetics of Boride Layers at the 13% Cr Steel Interface with Amorphous Boron

Dybkov

2007

DDF

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Two borides FeB and Fe2B were found to form as separate layers at the interface between a 13% Cr steel and boron at 850-950 oC and reaction times up to 12 h. The chromium distribution within the boride layers is rather irregular. Its average content is 8 at. % in the FeB layer and 9 at. % in the Fe2B layer. Both layers are characterized by a pronounced texture. The strongest reflections are {002} and {020} for the orthorhombic FeB phase and {002} for the tetragonal Fe2B phase. Diffusional growth kinetics of boride layers are close to parabolic and can alternatively be described by a system of two non-linear differential equations, producing a good fit to the experimental data.

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Diffusional Growth Kinetics of Boride Layers on Iron-Chromium Alloys

Dybkov

Goncharuk

Khoruzha

et al. 2008

SSP

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Two boride layers were found to form at the interface of iiron-chromiium alllloys (10 and 25% Cr) or an industrial 13% Cr steel and boron at 850-950 oC and reaction times in the range 1-12 h. In the case of a Fe-10% Cr alloy and the steel, the layers are based on the FeB and Fe2B compounds. With a Fe-25% Cr alloy, the constituent phases are FeB and CrB for the outer layer and Fe2B and Cr2B for the inner layer. Both layers are characterized by a pronounced texture. Diffusional growth kinetics of boride layers are close to parabolic and can alternatively be described by a system of two non-linear differential equations, producing a good fit to the experimental data. The temperature dependence of the layer growth-rate constants obeys a relation of the Arrhenius type.

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Boronizing with powdered mixtures

Cited by 3 publications

References 0 publications

Tribological properties of boride based thermal diffusion coatings

Tribological properties of boride based thermal diffusion coatings

Diffusional Growth Kinetics of Boride Layers at the 13% Cr Steel Interface with Amorphous Boron

Diffusional Growth Kinetics of Boride Layers on Iron-Chromium Alloys

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