Abstract
In this study, the crystallization behavior of glass-ceramics containing varying amounts of potassium mica-cordierite was investigated. The effect of stabilizer addition on microstructure and crystallization behavior and different ratios of mica-cordierite on microhardness, machinability and electrical properties were also characterized. First, glass compositions containing different ratios of potassium mica and cordierite were prepared, mixed and casted at proper temperatures. 4 mass % CeO2 as a stabilizer and 2 mass % CaO as a melting agent were added to the glass compositions. Then, disc and cylindrical shape samples were prepared and subjected to controlled heat treatment procedures. All samples were characterized by using electron microscopy and a series of mechanical tests was also conducted. Chemical durability and electrical resistivity of materials were also determined. It was observed that CeO2 addition promotes cordierite formation and CaO addition as a melting agent decreases the melting temperature of glasses. In selected glass compositions, curved mica that provides machinability and cordierite phases precipitated in glass matrix. In machinability tests, all compositions having varying amount mica and cordierite ration have perfect machinability. Chemical durability of glass ceramics was relatively high and it was observed that CaO addition reduced the chemical durability. High electrical resistivity of samples makes them attractive for use in electrical insulators.
| Original language | English |
|---|---|
| Pages (from-to) | 209-222 |
| Number of pages | 14 |
| Journal | High Temperature Materials and Processes |
| Volume | 27 |
| Issue number | 4 |
| Publication status | Published - 2008 |
Keywords
- Cordierite
- Glass-ceramic
- Insulator
- Machinable