Machinability of fluormica glass-ceramics of high mica volume fraction
| Autor: | Ali S. Alzahrani, Maher Rashwan, Andrew J. Bushby, Robert G. Hill, Tina Behraznia |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Machinability chemistry.chemical_element Barium 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Indentation hardness Crystallinity chemistry visual_art 0103 physical sciences Volume fraction Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Mica Composite material 0210 nano-technology |
| Zdroj: | Journal of the European Ceramic Society. 40:887-892 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2019.08.025 |
| Popis: | The high Machinability of Mica glass-ceramics is due to its unique microstructure. This study investigated barium fluormica glass-ceramics, with reference to parameters, which determine the microstructure that governs Hardness and machinability and explore the validity of Baik’s model for high mica Volume Fractions. Barium fluormica glasses were synthesized and casted into rods then heat-treated at 1175 °C and 1200 °C for various times. Glass-ceramics were characterized using DSC, SEM, Vickers microhardness and machinability test. “House of Cards” microstructure was successfully obtained upon heat treatment and was associated with an increase in Volume Fraction and Aspect Ratio of crystals. The Volume Fraction was almost identical for all the samples. However, crystal length and width increased with increasing holding time. Hardness and machinability forces decreased with increasing the Aspect Ratio and Effective Crystallinity. Hardness and Machinability data agreed well with Baik’s data and extend the validity of Baik’s model to much higher Volume Fractions. |
| Databáze: | OpenAIRE |
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