Nanolaminated ternary carbide (MAX phase) materials for high temperature applications. (April 2018)

• Record Type: Journal Article
• Authors: Lapauw, T.; Swarnakar, A.K.; Tunca, B.; Lambrinou, K.; Vleugels, J.
• Is Part Of: International journal of refractory metals & hard materials. Volume 72(2018)
• Page Start: 51
• Page End: 55
• Publication Date: 2018-04
• Subjects: MAX phases -- Solid solutions -- X-ray diffraction -- Elastic properties; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2017.11.038
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: There is a clear need for high-strength (≥ 300 MPa), thermally stable, conductive materials that are also thermal shock resistant. Some MAX phases – ternary nano-laminated carbides and nitrides – are reported to fulfil all these requirements and can be considered as potential structural materials for high-temperature applications. In this work, a set of quaternary (M, M′)AX phase materials based on the Nb-Al-C system were synthesized by reactive hot pressing, starting from M-hydride powders. The possibility to substitute Nb with at least 10 at% of other M elements (M′ = Ti, Zr, Hf and Ta) in the crystal lattice was investigated. The crystal structure of the produced solid solutions was studied by X-ray diffraction and the lattice parameters were calculated by Rietveld refinement. The material behaviour in an inert atmosphere was tested by measuring the elastic properties – Young's Modulus and internal friction – as a function of temperature up to 1500 °C, and the effect of the substitution on the room temperature flexural strength was assessed. Highlights: Nb4 AlC3 solid solutions with Ti, Zr, Hf, V and Ta were successfully prepared by reactive hot pressing. The crystallographic parameters of the solid solutions were investigated. The effect of the M-site substitution on the high temperature elastic response was determined.