Influences of powder granularity on crystallizing characteristics in mica-contained glass ceramic

2017 3rd International Conference on Applied Materials and Manufacturing Technology

Xu, L.N.^1,2 ; Kong, D.Y.^2 ; Tian, Q.B.^2 ; Lv, Z.J.^3

Shandong Co-innovation Center of Green Building, Shandong Jianzhu University, Jinan, Shandong

250101, China^1

School of Materials Science and Engineering, Shandong Jianzhu University, Jinan, Shandong

250101, China^2

School of Mechanical and Electrical Engineering, Shandong Jianzhu University, Jinan, Shandong

250101, China^3

关键词: Applying pressure;    Glass Powder;    Glass samples;    Glassy systems;    Hot pressed sintering;    Mica crystals;    Powder size;    Preferential growth;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/242/1/012010/pdf
DOI  :  10.1088/1757-899X/242/1/012010

来源: IOP

【 摘 要 】

A machinable mica-contained glass ceramic in the SiO2-Al2O3-MgO-F glassy system was prepared by ball milling and hot pressed sintering. Three kinds of powder sizes of base glass were chosen and the effects of the glass powder sizes on the crystallization were explored by x-ray diffraction and scanning electron microscopy techniques. The results indicate that mica crystal as a major phase and KFeSi2O6and mullite as minor phases are crystallized. Applying pressure at 670°C has little influences on the types of crystal precipitated and the preferential growth of crystal. The powder sizes, however, have obvious effects on the morphology of precipitated mica crystals. In the glass sample with a powder size of d50=16.4 μm, the plate-shaped mica phase is precipitated. As the powder size decrease to 9.9 μm and 3.3 μm, however, the particle-shaped mica is formed instead of the plate-shaped crystals.