Effect of Heat Treatment Temperature on the Microstructure and Mechanical Properties of Li2O–SiO2–P2O5–Al2O3–K2O–CaO Glass-Ceramics
In this study, lithium disilicate glass-ceramics of Li2O–SiO2–P2O5– Al2O3–K2O–CaO glass ceramics were investigated for dental restoration by using one and two stage heat treatment processes. The homogeneous mixture of powder was melted in an oxidation atmosphere at 1450 °C for 2 h then it was formed into a mold on a hotplate. The heat treatment temperatures (650–800 °C) were determined from differential thermal analysis (DTA) traces. The effects of various heat treatment temperatures on phase and microstructure of the samples were characterized by X-ray diffraction (XRD) technique and scanning electron microscopy (SEM). Mechanical properties were investigated by Vickers hardness testing. It was found that the results confirmed the occurrence of Li2Si2O5, Li2SiO3, Li2PO4, Ca3SiO5 and SiO2 phases in the prepared glass ceramics. The optimum heat treatment temperature resulted in mechanical properties with a high density value of 2.44 g/cm3 and high Vickers hardness values in the range of 5.56–5.69 GPa.
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Document Type: Research Article
Publication date: September 1, 2018
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