Phase formation and microstructure evolution in mullite ceramics synthesized from mechanochemically activated oxide powders doped with Cr2O3. (December 2018)

• Record Type: Journal Article
• Authors: Xiao, Zhuohao; Li, Xianglin; Sun, Xinyuan; Yu, Shijin; Jiang, Yi; Li, Xiuying; Jiang, Hong; Luo, Wenyan; Wang, Chuanhu; Zhang, Tianshu; Li, Sean; Kong, Ling Bing
• Is Part Of: Journal of physics and chemistry of solids. Volume 123(2018)
• Page Start: 198
• Page End: 205
• Publication Date: 2018-12
• Subjects: Cr2O3 -- High-energy ball milling -- Mechanochemical activation -- Microstructure evolution -- Mullite; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2018.08.003
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: In this study, we investigated the influence of Cr2 O3 on phase formation and microstructure evolution in mullite ceramics. We also explored the mechanochemical effects of high-energy milling with stainless steel and tungsten carbide. X-ray diffraction and scanning electronic microscopy analyses showed that the introduction of Cr2 O3 had a negative effect on the formation of mullite. As the Cr2 O3 content increased from 5 mol% to 20 mol%, the initial formation temperature for mullite increased from 1300 °C to 1500 °C. The negative effect of Cr2 O3 on the formation and growth of mullite can be mitigated by mechanochemically activating the precursor mixture via high-energy ball milling. Highlights: Mullite ceramics made from Cr2 O3 -doped oxide powders activated mechanochemically. Cr2 O3 formed solid solution with Al2 O3 to hinder mullitization of Al2 O3 -SiO2 . Mechanochemical activation reduced negative effect of Cr2 O3 on mullite formation. Phase transformation and structure of Cr2 O3 -doped mullite ceramics investigated.