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Gao, Ning; Miyamoto, Yoshinari; Zhang, D.

doi:10.1023/a:1004664500254

Cited by 172 publications

(53 citation statements)

References 8 publications

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“…It can be seen that the Vickers hardness decreased with an increase in load when the applied load is smaller than 10 N, and stabilized at 2.8 GPa under higher load, similar to the results in Ti 3 SiC 2 . 19,20) The high Vickers hardness at low indentation load is attributed to the elastic recovery that results in a smaller indent after indentation. Figure 5 shows the four-point bending deformation curves of the Ti 3 AlC 2 specimens at different temperatures.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Behavior of Ti3AlC2 Prepared by Pulse Discharge Sintering Method

et al. 2007

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Almost single-phase ternary compound Ti 3 AlC 2 was successfully synthesized by pulse discharge sintering (PDS) from Ti/Al/TiC powder mixtures with molar ratio of 2 : 2 : 3. The typical microstructure of Ti 3 AlC 2 was found to consist of plate-like grains with mean size of 9.5 mm in length. Four-point bending testing results revealed that the fracture behavior is brittle below 1200 C, and some characteristics of plastic deformation were observed at higher testing temperatures. The polycrystalline Ti 3 AlC 2 synthesized by PDS technique shows good strength at high temperatures.

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Section: Resultsmentioning

confidence: 99%

Mechanical Behavior of Ti3AlC2 Prepared by Pulse Discharge Sintering Method

et al. 2007

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“…Further, lower growth rates along c than along a axes is general for the MAX phases, and the reason why bulk synthesis of MAX phases often yields grains with a platelike appearance [261,262,263].…”

Section: Growth Modementioning

confidence: 99%

The M+1AX phases: Materials science and thin-film processing

et al. 2010

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This article is a critical review of the M n+1 AX n phases ("MAX phases", where n =1, 2, or 3) from a materials science perspective. MAX phases are a class of hexagonal-structure ternary carbides and nitrides ("X") of a transition metal ("M") and an A-group element. The most well known are Ti 2 AlC, Ti 3 SiC 2 , and Ti 4 AlN 3 . There are ~60 MAX phases with at least 9 discovered in the last five years alone. What makes the MAX phases fascinating and potentially useful is their remarkable combination of chemical, physical, electrical, and mechanical properties, which in many ways combine the characteristics of metals and ceramics. For example, MAX phases are typically resistant to oxidation and corrosion, elastically stiff, but at the same time they exhibit high thermal and electrical conductivities and are machinable. These properties stem from an inherently nanolaminated crystal structure, with M n+1 X n slabs intercalated with pure A-element layers. The research on MAX phases has been accelerated by the introduction of thin-film processing methods.Magnetron sputtering and arc deposition have been employed to synthesize single-crystal material by epitaxial growth, which enables studies of fundamental materials properties. However, the surface-initiated decomposition of M n+1 AX n thin films into MX compounds at temperatures of 1000-1100 °C is much lower than the decomposition temperatures typically reported for the corresponding bulk material. We also review the prospects for low-temperature synthesis, which is essential for deposition of MAX phases onto technologically important substrates. While deposition of MAX phases from the archetypical Ti-Si-C and Ti-Al-N systems typically require synthesis temperatures of ~800 °C, recent results have demonstrated that V 2 GeC and Cr 2 AlC can be deposited at ~450 °C. Also, thermal spray of Ti 2 AlC powder has been used to produce thick coatings. We further treat progress in the use of first-principles calculations for predicting hypothetical MAX phases and their properties. Together with advances in processing and materials 3 analysis, this progress has led to recent discoveries of numerous new MAX phases such as Ti 4 SiC 3 , Ta 4 AlC 3 , and Ti 3 SnC 2 . Finally, important future research directions are discussed. These include charting the unknown regions in phase diagrams to discover new equilibrium and metastable phases, as well as research challenges in understanding their physical properties, such as the effects of anisotropy, impurities, and vacancies on the electrical properties, and unexplored properties such as superconductivity, magnetism, and optics. 4

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“…The theoretical density is 4.53 g/cm 3 . 1 It has a hardness of 4 GPa, a Young's modulus of 325 GPa, a roomtemperature fracture toughness about 7 MPa m 1/2 and is quite damage tolerant.…”

Section: Introductionmentioning

confidence: 92%

Effect of Na2SO4 and Water Vapor on the Corrosion of Ti3SiC2

Liu¹,

Zhou

2006

Oxid Met

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The corrosion behavior of polycrystalline Ti 3 SiC 2 was studied in the presence of Na 2 SO 4 deposit and water vapor at 900°C and 1000°C. The mass gain per unit area of the samples superficially coated with Na 2 SO 4 exposed to water vapor was slightly lower than that of the samples corroded without water vapor. The microstructure and composition of the scales were investigated by SEM/EDS and XRD. Pores were observed in the corroded sample surfaces. The main corrosion phases on the sample surface were identified by XRD as TiO 2 , Na 2 Si 2 O 5 and Na 2 TiO 3 . After Ti 3 SiC 2 corroded in the presence of the Na 2 SO 4 deposit and water vapor, the scale had a three-layer microstructure, which was different from the duplex corrosion scale formed on Ti 3 SiC 2 beneath the Na 2 SO 4 film without water vapor. Because water vapor penetrated the corrosion layer and then reacted with SiO 2 to form volatile Si(OH) 4 , an intermediate porous and TiO 2 -enriched layer formed in the corrosion layer.

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Cited by 172 publications

References 8 publications

Mechanical Behavior of Ti<SUB>3</SUB>AlC<SUB>2</SUB> Prepared by Pulse Discharge Sintering Method

Mechanical Behavior of Ti<SUB>3</SUB>AlC<SUB>2</SUB> Prepared by Pulse Discharge Sintering Method

The M+1AX phases: Materials science and thin-film processing

Effect of Na2SO4 and Water Vapor on the Corrosion of Ti3SiC2

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