Microstructural evolution, phase transformation, and variations in physical properties of coal series kaolin powder compact during firing》.pdfVIP

Applied Clay Science 115 (2015) 76–86 Contents lists available at ScienceDirect Applied Clay Science journal homepage: www. elsevi er. com/ locate/ clay Microstructural evolution, phase transformation, and variations in physical properties of coal series kaolin powder compact during firing Xiaohong Xu, Xinbin Lao ⁎, Jianfeng Wu, Yaxiang Zhang, Xiaoyang Xu, Kun Li State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, PR China a r t i c l e i n f o a b s t r a c t Article history: Coal series kaolin (CSK) from coalmine in Shanxi, China was studied in the form of powder compact by using die- Received 4 November 2014 pressing technique. Mineralogical, morphological, and chemical characteristics of CSK were given. The Received in revised form 19 July 2015 microstructural evolution, phase transformation, and relevant variations in physical properties of the fired CSK Accepted 22 July 2015 with elevating temperature were investigated. Results indicated that mullite began to form at the temperature Available online 28 July 2015 as low as 1002.8 °C. Columnar mullite appeared when firing at 1500 °C. Transformation of cristobalite to liquid Keywords: phase favored the densification of the fired powder compacts and made them acquire the densest microstructure Coal series kaolin in 1580–1600 °C temperature interval. Die-pressing technique and flake-like nature of CSK particle induced the Microstructural