Synthesis of glass–ceramics in the CaO–MgO–SiO2 system with B2O3, P2O5, Na2O and CaF2 additives |
| |
| Affiliation: | 1. Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark;2. Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, USA;3. Science and Technology Division, Corning Incorporated, Corning, USA;4. Institute of High-Pressure Physics, Polish Academy of Sciences, Warsaw, Poland;5. Department of Mechanical and Manufacturing Engineering, Aalborg University, Aalborg, Denmark;1. Department of Mining and Materials Engineering, McGill University, Montreal, QC, Canada;2. Department of Chemical Engineering, McGill University, Montreal, QC, Canada;1. Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, PR China;2. Beijing Key Laboratory for Solid Waste Utilization and Management, College of Engineering, Peking University, Beijing 100871, PR China;1. AGH University of Science and Technology, Krakow, 30-059, Poland;2. HeidelbergCement Technology Center GmbH, Oberklamweg 2-4, 69181 Leimen, Germany |
| |
| Abstract: | Glass–ceramics based on the CaO–MgO–SiO2 system with limited amount of additives (B2O3, P2O5, Na2O and CaF2) were prepared. All the investigated compositions were melted at 1400 °C for 1 h and quenched in air or water to obtain transparent bulk or frit glass, respectively. Raman spectroscopy revealed that the main constituents of the glass network are the silicates Q1 and Q2 units. Scanning electron microscopy (SEM) analysis confirmed liquid–liquid phase separation and that the glasses are prone to surface crystallization. Glass–ceramics were produced via sintering and crystallization of glass-powder compacts made of milled glass-frit (mean particle size 11–15 μm). Densification started at 620–625 °C and was almost complete at 700 °C. Crystallization occurred at temperatures >700 °C. Highly dense and crystalline materials, predominantly composed of diopisde and wollastonite together with small amounts of akermanite and residual glassy phase, were obtained after heat treatment at 750 °C and 800 °C. The glass–ceramics prepared at 800 °C exhibited bending strength of 116–141 MPa, Vickers microhardness of 4.53–4.65 GPa and thermal expansion coefficient (100–500 °C) of 9.4–10.8 × 10?6 K?1. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
