Reactive flash spark plasma sintering of high-entropy ultrahigh temperature ceramics. (September 2019)

• Record Type: Journal Article
• Authors: Gild, Joshua; Kaufmann, Kevin; Vecchio, Kenneth; Luo, Jian
• Is Part Of: Scripta materialia. Number 170(2019)
• Page Start: 106
• Page End: 110
• Publication Date: 2019-09
• Subjects: High-entropy ceramics -- Spark plasma sintering -- Ultrahigh temperature ceramics -- Borides -- Carbides; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.05.039
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A new Reactive Flash Spark Plasma Sintering (ReaFSPS) method has been developed to synthesize high-entropy ultrahigh temperature ceramics (UHTCs), using (Hf0.2 Zr0.2 Ta0.2 Nb0.2 Ti0.2 )B2 and (Hf0.2 Zr0.2 Ta0.2 Nb0.2 Ti0.2 )C as examples. X-ray diffraction, energy dispersive X-ray spectroscopy, and electron backscatter diffraction collectively show the formation of a single high-entropy phase within ~2 min. Notably, adding 3 wt.% of carbon can promote the formation and homogenization of a high-entropy diboride phase without aggressive mechanical alloying, achieving a >99% relative density. This work has established a new rapid and potentially scalable method to use ReaFSPS to synthesize homogenous high-entropy UHTCs from commercial powders of individual constituents. Graphical abstract: Unlabelled Image