High-temperature oxidation of composites based on titanium carbonitride and double titanium-chromium carbide

Umanskii, A. P.; Lavrenko, V. A.; Chuprov, S. S.; Konoval, V. P.

doi:10.1007/s11148-006-0099-5

Cited by 5 publications

(3 citation statements)

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“…These studies have shown that under these test conditions (24 -1000°C, time 100 min) composite material TiCrB 2 has quite a high resistance to oxidation compared with materials based on TiCrC, TiCN [9].…”

Section: Resultsmentioning

confidence: 94%

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: 94%

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

Konoval

2011

Refract Ind Ceram

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“…In addition, TiC is employed in optics, electronics, and other fields. However, due to its wear resistance, corrosion resistance, higher temperature stability, and high hardness in comparison to TiC, titanium chromium carbide (TiCrC) is one of the wear-resistant materials [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Spark Plasma Sintering of Nanostructured TiCrC Carbides Prepared via Mechanical Alloying

Mhadhbi¹,

Dağ²,

Avar³

et al. 2022

Preprint

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In order to produce nanostructured Ti0.9Cr0.1C powders, an elemental powder mixture of titanium, chromium, and graphite is milled in this work using a high-energy ball mill for various milling times. Microstructural characteristics such as crystallite size, microstrain, lattice parameter, and dislocation density are determined using X-ray diffraction (XRD). Mechanical alloying successfully produced nanocrystalline (Ti,Cr)C with an average crystallite size of 11 nm. This size of the crystallites is also directly verified using transmission electron microscopy (TEM). Scanning electron microscopy (SEM) was used to investigate the morphology of the samples. The novelty of this work is advancing the scientific understanding of the effect of milling time on the particle size distribution and crystalline structure, and also understanding the effect of the spark plasma sintering on the different properties of the bulks. Densified cermet samples were produced from the nanocrystalline powders, milled for 5, 10 and 20 hours by SPS process at 1800 degrees for 5 min under a pressure of 80 MPa. Phase changes of the produced cermets were examined according to XRD, SEM/EDX analyses. Significant amounts of Cr and Fe elements were detected, especially in the 20 h milled cermet. The bulk forms of the milled powders for 5 and 20 h had a relative density of 98.43 and 98.51 %, respectively. However, 5 h milled cermet had 93.3 HRA because of the more homogeneous distribution of the (Ti,Cr)C phase, the low iron content and high relative density. According to the 0.0011 mm/year corrosion rate, and 371.68 kΩ*cm2 charge transfer resistance obtained from the potentiodynamic polarization and EIS tests, the 20 h cermet was the specimen with the highest corrosion resistance.

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“…The tests on the composite material based on double titanium-chromium carbide, but with nickel-chromium binder, established that its reaction with oxygen in air also proceeds in three stages [3].…”

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High-temperature oxidation of composite based on double titanium–chromium carbide

Umanskii

Lavrenko

Chuprov

et al. 2009

Powder Metall Met Ceram

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The effect of a metallic binder and nickel coating on the high-temperature oxidation resistance of a composite material based on double titanium-chromium carbide is studied. It is shown that the introduction of a Fe-Cr binder decreases the rate of oxidation of the base material, but the maximum weight increment of the samples remains as it is in the initial TiCrC because of the oxidation of binder components. The nickel coating not only substantially decreases the oxidation rate of the composite components, but also shifts the thermal effects toward much higher temperatures. The oxidation occurs in two stages for compact samples, in three stages for the composite material, and in four stages for the composite material with nickel coating.Refractory titanium compounds are widely used as structural and tool materials in various industrial fields. Double and triple systems of carbides, nitrides, and carbonitrides of transition metals for coatings are of high interest [1]. At high temperatures, their stoichiometric composition changes, giving rise to various compounds. As a consequence, the service characteristics of these materials may vary over a wide range [2].To find out whether titanium chromium carbide and TiCrC-based materials can work at high temperatures (to 1000°C) and can be employed as gas-thermal (plasma, detonation) coatings, the resistance to high-temperature oxidation (HTO) of these materials was tested. We tested powders of initial material TiCrC, composite material TiCrC-30 wt.% (Fe-Cr) (TKhKF-30), nickel-and phosphorus-clad composite material TKhKF-30, and TKhKF-30 compacts. The TKhKF-30 powder was produced by grinding and screening of sinters, while the compacts were made by hot pressing. The nickel-phosphorus (Ni-10 wt.% P) coating was chemically deposited in water solution using sodium hypophosphite as a reducer. The particle size was -100+40 μm.The HTO resistance of the samples was tested by nonisothermal heating to 1000°C in air at a rate of 10 °C/min using a Q-1500 derivatograph. An aluminum oxide powder was used as a reference material. The charge had 200 mg in weight.The differential thermal (DT) curve of TiCrC initial powder (Fig. 1) displays two exothermic effects. One (peak at 660°C) represents the reaction between TiCrC and oxygen in air:TiCrC + 2O 2 = TiO 2 + CrO + CO↑.(1)

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High-temperature oxidation of composites based on titanium carbonitride and double titanium-chromium carbide

Cited by 5 publications

References 1 publication

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

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

Spark Plasma Sintering of Nanostructured TiCrC Carbides Prepared via Mechanical Alloying

High-temperature oxidation of composite based on double titanium–chromium carbide

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