Formation of electric-spark coatings from composite materials based on titanium-chromium carbide and diboride

Konoval, V. P.; Umanskyi, Oleksandr; Panasyuk, A. D.; Podchernyaeva, I. O.; Koval, O. Yu.

doi:10.3103/s1063457609040091

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…This is connected with reaction of titanium-chromium diboride with air oxygen by reaction (6) and iron by the reaction A second exothermic effect is observed at 630°C and is accompanied by a weight gain (see Fig. 3c ) as a result of action of titanium-chromium diboride with oxygen by reaction (7).…”

Section: Resultsmentioning

confidence: 80%

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Corrosion resistance of titanium-chromium diboride and composite material based on it

Konoval

2011

Refract Ind Ceram

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The resistance to electrochemical corrosion and high-temperature oxidation of titanium-chromium diboride and materials with a metal binder based upon it is studied. The mechanism of processes that occur in compacted specimens and powders is studied, and the composition of reaction products in relation to specimen heating temperature is determined. It is established that the oxide films that form at a specimen surface during oxidation are protective and prevent further material oxidation.The expediency of ceramic and cermet materials in various technology is due to their high heat resistance and high-temperature strength in air, corrosion resistance in electrolytes, hardness and wear resistance. Among the considerable number of ceramic materials there is special interest in refractory compounds of titanium: TiC, TiB 2 , TiN, TiCN, TiCrC, TiCrB 2 . The advantage of these ceramic materials is the high hardness, wear-and corrosion-resistance, high density, good electrical conductivity (for this class of materials), and also presence within CIS countries of a rich raw material base for their manufacture.Among the materials listed the greatest interest with respect to properties is titanium-chromium diboride TiCrB 2 [1]. In the majority of work devoted to this material, the mechanism of its contact reaction with metal alloys has been studied [2, 3], mechanical and tribotechnical properties have been determined [4,5], both in pure form, and also with a metal binder, and the possibilities for deposition and surfacing have been determined [6,7].A promising area for using titanium-chromium diboride, composite materials and coatings based on it, is use in corrosive media (chemical industry) and at high temperature. With the aim of determining life under these conditions for titanium-chromium diboride and composite material developed on its basis, the corrosion resistance of these materials in 3% NaCl solution and their resistance to high-temperature oxidation were studied. EXPERIMENTAL PROCEDURE AND MATERIALSElectrochemical corrosion was studied at 20°C in a medium of 3% NaCl solution (sea water) in an electrochemical cell with an anode of the test material and a platinum cathode by a potentiodynamic method of polarization curves using PI50 -1 and P5848 potentiostats. The electrolyte composition after electrolysis was studied by chemical analysis.The corrosion resistance at high temperature was evaluated by differential thermal analysis (DTA). DTA-curves with T-curves (temperature) and thermogravimetric TGcurves were recorded in a derivatograph type Q-1500 (rate of temperature increases 10°C/min) in the range 20 -1000°C at atmospheric air pressure. The sensitivity selected in the records was: DTA -1/10; DTG -1/10; TG -2.0 × 10 -5 kg. The standard sued for DTA measurements was freshly calcined a-Al 2 O 3 . The weight of test material samples was 200 mg.In order to determine the composition of oxidation products at different specimen temperatures a corresponding material was subjected to isothermal heating in air up to a maxi...

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Section: Resultsmentioning

confidence: 80%

“…In the majority of work devoted to this material, the mechanism of its contact reaction with metal alloys has been studied [2, 3], mechanical and tribotechnical properties have been determined [4,5], both in pure form, and also with a metal binder, and the possibilities for deposition and surfacing have been determined [6,7].…”

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confidence: 99%

Corrosion resistance of titanium-chromium diboride and composite material based on it

Konoval

2011

Refract Ind Ceram

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“…Oxides in the Fe-Cr-O system formed on the coating and potential oxidation of the composite in the friction process leading to secondary oxide phases that may serve as a solid lubricant should contribute to excellent tribological characteristics of the coatings. We have shown [8] that the TKhBF-30 composite has high tribotechnical, mechanical, and corrosion properties. The composition and structure of the starting TKhBF-30 material that remain unchanged in the coatings should ensure their high service characteristics.…”

Section: Resultsmentioning

confidence: 94%

“…This is evidence of partial hightemperature oxidation of the powders when sprayed and is confirmed by an electron microprobe analysis of the two coatings (Figs. [6][7][8]. The concentration maxima of oxygen and titanium (Figs.…”

Section: Resultsmentioning

confidence: 99%

Structure and phase composition of composite detonation coatings based on TiCrB2 and ZrB2

Podchernyaeva

Astakhov

Umanskii

et al. 2010

Powder Metall Met Ceram

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The detonation method is used to deposit TiCrB 2 -FeCr and (AlN-ZrB 2 -ZrSi 2 )-NiCr composite coatings on steel 45. The structure, microstructure, and morphology of the starting powders and detonation coatings are studied. Based on the distribution of elements and microhardness at the coating-substrate interface, the formation of the coatings is analyzed. It is shown that a transition zone forms at the coating-substrate interface due to mutual mass transfer. This zone promotes strong adhesion and gradual decrease in microhardness toward the substrate. High-temperature corrosion-resistant chromites and mullites, which can serve as a solid lubricant, form in the system containing a solid-phase multicomponent phase (AlN, ZrB 2 , ZrSi 2 ). The coatings are thus expected to have excellent tribotechnical properties.

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Structure, Properties, and Use of Protective Cermet Coatings Prepared By Electric-Spark Alloying and Electric-Arc Hardfacing

Бажин¹,

Столин²,

Чижиков³

et al. 2016

Refract Ind Ceram

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Formation of electric-spark coatings from composite materials based on titanium-chromium carbide and diboride

Cited by 3 publications

References 4 publications

Corrosion resistance of titanium-chromium diboride and composite material based on it

Corrosion resistance of titanium-chromium diboride and composite material based on it

Structure and phase composition of composite detonation coatings based on TiCrB2 and ZrB2

Structure, Properties, and Use of Protective Cermet Coatings Prepared By Electric-Spark Alloying and Electric-Arc Hardfacing

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