Molten salt shielded synthesis of oxidation prone materials in air

Dash, A. and Vaßen, R. and Guillon, O. and Gonzalez-Julian, J.

Volume: 18 Pages: 465-470
DOI: 10.1038/s41563-019-0328-1
Published: 2019

To prevent spontaneous oxidation during the high-temperature synthesis of non-oxide ceramics, an inert atmosphere is conventionally required 1,2 . This, however, results in high energy demand and high production costs. Here, we present a process for the synthesis and consolidation of oxidation-prone materials, the ‘molten salt shielded synthesis/sintering’ process (MS 3 ), which uses molten salts as a reaction medium and also to protect the ceramic powders from oxidation during high-temperature processing in air. Synthesis temperatures are also reduced, and the final product is a highly pure, fine and loose powder that does not require additional milling steps. MS 3 has been used for the synthesis of different ternary transition metal compounds (MAX phases, such as Ti 3 SiC 2 3 , Ti 2 AlN 4 , MoAlB 5 ), binary carbides (TiC) and for the sintering of titanium. The availability of high-quality powders, combined with energy and cost savings, may remove one of the bottlenecks for the industrial application of these materials. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.

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