Development of Machinable Glass-Ceramics Produced from Vermiculite

U. Önena, E. Ercenk b and Ş. Yılmaz b aCumhuriyet University, Engineering Faculty, Department of Metallurgical and Materials Engineering, Campus, 58140 Sivas, Turkey bSakarya University, Engineering Faculty, Department of Metallurgical and Materials Engineering, Esentepe, Campus, 54187 Sakarya, Turkey

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In this study, machinable glass-ceramics were produced from vermiculite and K2CO3, SiO2, Al2O3 and MgF2 as additives by melting process. The starting materials were mixed together and milled in a mill with alumina ball for 2 h. The mixed powders were melted by aluminum crucible at 1500°C. The melted glass was cast into graphite mold, and then it was exposed to crystallization heat treatment for glass-ceramic transformation. The glass-ceramic samples were characterized with X-ray diffraction analysis, scanning electron microscopy, mechanical tests such as hardness, fracture toughness and machinability test. The results indicate that machinability properties can be obtained from vermiculite based glass-ceramic with some additives.

DOI: 10.12693/APhysPolA.131.168 PACS numbers: 81.05.Pj