Tungsten Borides: On the Reaction of Tungsten with Boron(III) Bromide. Issue 40 (29th June 2018)

• Record Type: Journal Article
• Authors: Henschel, Anne; Binnewies, Michael; Schmidt, Marcus; Köppe, Ralf; Burkhardt, Ulrich; Grin, Yuri
• Is Part Of: Chemistry. Volume 24:Issue 40(2018)
• Page Start: 10109
• Page End: 10115
• Publication Date: 2018-06-29
• Subjects: boron -- bromides -- hot-wire method -- thermodynamics -- tungsten; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201801778
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: The crucible‐free reaction between heated tungsten wires and gaseous boron tribromide yields different tungsten borides. The experiments were carried out at various reaction temperatures and times, revealing the formation of W2 B, WB and WB2 phases. The underlying reactions were analyzed by using thermodynamic model calculations. The stability of the gaseous tungsten bromides was evaluated using quantum chemical methods. While the developed synthesis of phase‐pure borides is only possible to a limited extent, it offers a potential route for a formation of protective coatings with high chemical and thermal resistance. Abstract : Boride on the wire : The crucible‐free reaction between heated tungsten wires and gaseous boron tribromide yields different tungsten borides (W2 B, WB, WB2 ) depending on reaction temperature and duration. The underlying reactions were analyzed with selected experiments and by using thermodynamic model calculations. While the developed synthesis of phase‐pure borides is only possible to a limited extent, it offers a potential route for a formation of protective coatings.