Investigation on the reaction mechanisms between RE-W cathode and carbon dioxide at 1273 K. (May 2015)

• Record Type: Journal Article
• Authors: Yang, Jinian; Gu, Zhongzhu; Xu, Jinjin; Xi, Xiaoli; Jiang, Zhensong
• Is Part Of: International journal of refractory metals & hard materials. Volume 50(2015:May)
• Page Start: 37
• Page End: 42
• Publication Date: 2015-05
• Subjects: Oxidation -- Carbon dioxide -- Tungsten -- Rare earth; 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.2014.11.009
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: Potential chemical reactions of rare earth-tungsten (RE-W) cathode and carbon dioxide (CO2 ) gas at 1273 K were examined. The structures, morphologies and distribution of elements on the RE-W cathode surfaces were explored using X-ray diffraction, field emission scanning electron microscopy and energy dispersive analysis. Reactions on the RE-W cathode surfaces were observed as the samples were heated in CO2 atmosphere under various heating times. Blue tungsten (WO2.83 ) thin film was formed and verified as the primary product, whereas the CO gas and carbon black were the two other by-products of the chemical reactions that happened between CO2 gas and bulk tungsten. WO2.83 thin film, which was adhered firmly on the RE-W cathode surface, became thicker and more compact with increased heating time. Finally, the oxidization reaction was terminated when the experimental time exceeded 18 h. Graphical abstract: Surface structures and morphologies of RE-W cathode change with varying heating times. Highlights: RE-W cathode was oxidized in CO2 atmosphere at 1273 K. Blue tungsten (WO2.83 ) film was the main oxidation product. Increasing heating time made the WO2.83 film thicker and more compact. Incrassate WO2.83 film terminated the oxidization reaction.