Improved crystallisation of polysilazane‐derived Si3N4/SiC nanocomposites with Fe2O3 catalyst. (20th April 2021)

• Record Type: Journal Article
• Authors: Zhang, Wenshu; Wang, Shuo; Ding, Honghui; Zhai, Xueying; Yang, De'an
• Is Part Of: Micro & nano letters. Volume 16:Number 7(2021)
• Page Start: 399
• Page End: 404
• Publication Date: 2021-04-20
• Subjects: Nanotechnology -- Periodicals; Nanostructures -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1049/mna2.12064
• Languages: English
• ISSNs: 1750-0443

Abstract

Abstract: In the present study, the use of a 3 wt% Fe2 O3 catalyst improved the crystallisation of polysilazane PSN2. Crystallisation peaks of higher intensity were observed for Si3 N4 and SiC at 1250 °C by using a 3 wt% Fe2 O3 catalyst than at 1500 °C without Fe2 O3 . Besides, the effects of temperature on the morphology of the samples were determined through scanning electron microscopy. Porous structures were observed at 1250 °C and these structures were transformed to flaky and near‐spherical nanoparticles as the temperatures were increased to 1350 and 1450 °C, respectively. Finally, the mechanism of Fe origination from Fe2 O3 reduction, the production of a supersaturated liquid alloy, and the release and diffusion of N2 were proposed for Si3 N4 formation.