Model for Vickers microhardness prediction applied to SnO2 and TiO2 in the normal and high pressure phases

Caravaca, M.; Kosteski, Luís Eduardo; Miño, Julio C.; D’Ambra, Ricardo Barrios; Uberti, Bruno; Casali, R.

doi:10.1016/j.jeurceramsoc.2014.06.022

Cited by 15 publications

(4 citation statements)

References 48 publications

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“…Historically, Macro Vickers loads vary from 2 to 120 kg. However, when the applied loads range from a few grams to several kilograms, micro-hardness ( H ) measurements are more suitable 102 , 103 . A semi-empirical formula that can estimate the micro-hardness ( H ) is listed in Eq.…”

Section: Resultsmentioning

confidence: 99%

Ab initio study of mechanical and thermal properties of GeTe-based and PbSe-based high-entropy chalcogenides

Hasan,

Adhikari,

San

et al. 2023

Sci Rep

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GeTe-based and PbSe-based high-entropy compounds have outstanding thermoelectric (TE) performance and crucial applications in mid and high temperatures. Recently, the optimization of TE performance of high-entropy compounds has been focused on reducing thermal conductivity by strengthening the phonon scattering process to improve TE performance. We report a first-principles investigation on nine GeTe-based high-entropy chalcogenide solid solutions constituted of eight metallic elements (Ag, Pb, Sb, Bi, Cu, Cd, Mn, and Sn) and 13 PbSe-based high-entropy chalcogenide solid solutions: Pb0.99-ySb0.012SnySe1-2xTexSx (x = 0.1, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, and y = 0) and Pb0.99-ySb0.012SnySe1-2xTexSx (y = 0.05, 0.1, 0.15, 0.2, 0.25 and x = 0.25). We have investigated the mechanical properties focusing on Debye temperature (ΘD), thermal conductivity (κ), Grüneisen parameter (γα), dominant phonon wavelength (λdom), and melting temperature (Tm). We find that the lattice thermal conductivity is significantly reduced when GeTe is alloyed into the following compositions: Ge0.75Sb0.13Pb0.12Te, Ge0.61Ag0.11Sb0.13Pb0.12Bi0.01Te, and Ge0.61Ag0.11Sb0.13Pb0.12Mn0.05Bi0.01Te. This reduction is due to the mass increase and strain fluctuations. The results also show that Ge0.61Ag0.11Sb0.13Pb0.12Bi0.01Te solid solution has the lowest Young’s modulus (30.362 GPa), bulk and shear moduli (18.626 and 12.359 GPa), average sound velocity (1653.128 m/sec), Debye temperature (151.689 K), lattice thermal conductivity (0.574 W.m–1.K–1), dominant phonon wavelength (0.692 Å), and melting temperature (535.91 K). Moreover, Ge0.61Ag0.11Sb0.13Pb0.12Bi0.01Te has the highest Grüneisen parameter with a reduced and temperature-independent lattice thermal conductivity. The positive correlation between ΘD and κ is revealed. Alloying of PbSe-based high-entropy by Sb, Sn, Te, and S atoms at the Se and Pb sites resulted in much higher shear strains resulted in the reduction of phonon velocity, a reduced ΘD, and a lower lattice thermal conductivity.

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Section: Resultsmentioning

confidence: 99%

Ab initio study of mechanical and thermal properties of GeTe-based and PbSe-based high-entropy chalcogenides

Hasan,

Adhikari,

San

et al. 2023

Sci Rep

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“…According to the results of the X-ray phase analysis, an increase in the wear resistance of the surface layers of the Ti-Si-C composite material after 800 • C was associated with the formation of TiO 2 and the presence of a larger fraction of the TiC carbide hardening phase (Figure 9). In [38,39], it was shown that an oxide compound based on TiO 2 increases the wear resistance and strength of materials. Detonation coatings based on titanium carbosilicide are characterized by high wear resistance.…”

Section: Resultsmentioning

confidence: 99%

Structural Features and Tribological Properties of Detonation Gun Sprayed Ti–Si–C Coating

et al. 2021

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The paper considers the research results of structural-phase state and tribological characteristics of detonation coatings based on Ti–Si–C, obtained at different filling volumes of the explosive gas mixture barrel of a detonation gun. The results analysis indicates that the phase composition and properties of detonation coatings strongly depend on the technological parameters of spraying. With an increase of the explosive mixture in the filling volume of the detonation barrel up to 70% of the coatings consist mainly of the TiC phase, because high temperature leads to a strong decomposition of Ti3SiC2 powders. Thus, the XRD results confirm that at 70% of the explosive gas mixture’s filling volume, partial decomposition and disintegration of the powders occurs after detonation spraying. We established that detonation coatings based on titanium carbosilicide obtained at the explosive gas mixture’s filling volume at 60% are characterized by high wear resistance and adhesive strength. Thermal annealing was performed after spraying in the temperature range of 700–900 °C for 1 h to reduce microstructural defects and improve the Ti–Si–C coating characteristics. As a result of the heat treatment in the Ti–Si–C system at 800 °C, we observed that an increase in the volume fraction of the Ti3SiC2 and TiO2 phases led to a 2-fold increase in microhardness. This means that the after-heat-treatment can provide a sufficient reaction time for the incomplete reaction of the Ti–Si–C (TSC) coating during the detonation gun spraying. Thus, annealing can provide an equal distribution of elements in the coatings.

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“…According to the result of X-ray phase analysis, an increase in the wear resistance of the near-surface layers of the Ti 3 SiC 2 /TiC composite material after 800 • C is associated with the formation of TiO 2 and the presence of a large proportion of the hardening carbide phase TiC (Figure 3). In [15][16][17][18], it is stated that the oxide compound based on TiO 2 increases the wear resistance and strength of materials. It was established that during detonation spraying of Ti 3 SiC 2 powders a coating with a higher microhardness and wear resistance is formed [19,20].…”

Section: Resultsmentioning

confidence: 99%

Reserach of the mechanic-tribological characteristics of Ti3SiC2/TiC coatings after annealing

Буйткенов¹,

Rakhadilov²,

Sagdoldina³

et al. 2020

Eurasian J. Phys. Funct. Mater.

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This article investigates the influence of thermal annealing on microhardness and wear resistance of the surface of steel U9/Y9 protected by a composite coating Ti 3 SiC 2 /TiC obtained by detonation sputtering. Thermal annealing was performed in the range of temperatures 700-900 • C during 1 hour. Following annealing the formation of TiO 2 and an increase in the phase content of Ti 3 SiC 2 are observed. Higher microhardness was obtained in coatings subjected to annealing at 800 • C, which can be explained by an increase in the content of carbonized titanium. As the annealing temperature rises further, the thickness of the oxide layer increases, leading to a decrease in the microhardness for the coatings annealed at 900 • C. According to the results of tribological tests, formation of the oxide increases wear resistance of Ti 3 SiC 2 /TiC composite surface coatings.

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Model for Vickers microhardness prediction applied to SnO2 and TiO2 in the normal and high pressure phases

Cited by 15 publications

References 48 publications

Ab initio study of mechanical and thermal properties of GeTe-based and PbSe-based high-entropy chalcogenides

Ab initio study of mechanical and thermal properties of GeTe-based and PbSe-based high-entropy chalcogenides

Structural Features and Tribological Properties of Detonation Gun Sprayed Ti–Si–C Coating

Reserach of the mechanic-tribological characteristics of Ti3SiC2/TiC coatings after annealing

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