Thermophysical properties of porous Ti2AlC and Ti3SiC2 produced by powder metallurgy

TiAl alloys have the potential to become a new generation of high-temperature materials due to their lightweight and high-strength properties, while the brittleness at room temperature and microstructure stability at elevated temperature are the key problems. The preparation of composite materials is an effective way to solve these problems, because the mechanical properties of TiAl matrix composites can be improved by the close combination of the reinforced phase and matrix. The preparation methods, microstructure, and mechanical properties of TiAl matrix composites reinforced by carbides are reviewed from the literature in this paper. A comprehensive summary of the effect of C on TiAl alloys can reveal the relationship between the microstructure and mechanical properties and provide guidance for subsequent experimental works. Two forms of C in TiAl matrix composites are reviewed: solid solutions in matrix and carbide precipitations. For TiAl alloys, the minimum carbon content for the carbide precipitation is about 0.5 at.% for low-Nb-containing TiAl alloys and about 0.8 at.% for high-Nb-TiAl alloys. An appropriate amount of C can improve the tensile properties and flexural strength of TiAl alloys. The hardness of the composites is higher than that of pure TiAl due to solution strengthening when the carbon content is low. The minimum creep rate of TiAl alloys can be reduced by one order of magnitude by adding C at the amount near the solubility limit.

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“…As shown in Figure 3a, Ti 2 AlC is a typical compound of the MAX phase [54]. Each cell contains 2 Ti 2 AlC molecules.…”

Section: Ti 2 Alcmentioning

confidence: 99%

Microstructure and Mechanical Properties of TiAl Matrix Composites Reinforced by Carbides

Yang

Liang

et al. 2022

Metals

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“…In recent years, there has been a search for different applications for the use of this family of materials. Their use as heat exchangers [7] or catalytic devices using porous Ti 3 SiC 2 and Ti 2 AlC [8], thermal barriers using Cr 2 AlC [9] or as fuel cladding material in nuclear reactors using Zr 2 AlC [10] are some of the possible applications of these materials.…”

Section: Introductionmentioning

confidence: 99%

Sinterability, Mechanical Properties and Wear Behavior of Ti3SiC2 and Cr2AlC MAX Phases

et al. 2022

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MAX phases are a promising family of materials for several demanding, high-temperature applications and severe conditions. Their combination of metallic and ceramic properties makes MAX phases great candidates to be applied in energy production processes, such as high temperature heat exchangers for catalytic devices. For their successful application, however, the effect of the processing method on properties such as wear and mechanical behavior needs to be further established. In this work, the mechanical and wear properties of self-synthesized Ti3SiC2 and Cr2AlC MAX phase powders consolidated by different powder metallurgy routes are evaluated. Uniaxial pressing and sintering, cold isostatic pressing and sintering and hot pressing were explored as processing routes, and samples were characterized by analyzing microstructure, phase constitution and porosity. Wear behavior was studied by reciprocating-sliding tests, evaluating the wear rate by the loss of material and the wear mechanism.

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Oxidation behavior of Ti2AlC MAX-phase foams in the temperature range of 600–1000 °C

Potoczek

Dąbek

Brylewski

2023

J Therm Anal Calorim

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The isothermal oxidation behavior of Ti2AlC gel-cast foams with an almost completely open porosity of 87 vol% was investigated in the temperature range of 600–1000 °C, in static air, and for exposure times of up to 6.5 h. It was found that the oxidation process obeyed the parabolic rate law. The determined parabolic oxidation rate constants were low, indicating that the material’s resistance to oxidation at high temperatures was very good, especially given its highly porous form. The nature of the scale formed on the strut surface of Ti2AlC foams changed significantly with increasing oxidation temperature. After oxidation at 600 °C, gaps/cracks were observed between Ti2AlC layers on the strut surface, and the oxidation products were mixed Ti and Al oxides. At 700–800 °C, the scales were integrated and composed of Ti and Al oxides. At 900–1000 °C, the oxidation products were composed of large elongated plates of TiO2 (rutile) and small, needle-like Al2O3 (corundum) grains.

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Thermophysical properties of porous Ti2AlC and Ti3SiC2 produced by powder metallurgy

Cited by 15 publications

References 99 publications

Microstructure and Mechanical Properties of TiAl Matrix Composites Reinforced by Carbides

Microstructure and Mechanical Properties of TiAl Matrix Composites Reinforced by Carbides

Sinterability, Mechanical Properties and Wear Behavior of Ti3SiC2 and Cr2AlC MAX Phases

Oxidation behavior of Ti2AlC MAX-phase foams in the temperature range of 600–1000 °C

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