INFLUENCE OF CRYSTAL GROWTH ON THE MECHANICAL PROPERTIES AND SURFACE ROUGHNESS OF LAS GLASS CERAMICS FOR DENTAL APPLICATIONS

Ayad Saad  Abd al-karim; Zaid G. A.  Al-jlaihawi

doi:10.30572/2018/KJE/170333

Authors

Ayad Saad Abd al-karim University of Kufa, College of Engineering, Department of Mechanical Engineering, Najaf, Iraq
Zaid G. A. Al-jlaihawi University of Kufa, College of Engineering, Department of Mechanical Engineering, Najaf, Iraq

DOI:

https://doi.org/10.30572/2018/KJE/170333

Keywords:

Glass-ceramics, Lithium aluminosilicate, Lithium disilicate, Crystallization, Crystal growth, Knoop hardness, Elastic modulus, Surfaces roughness

Abstract

Glass-ceramics of the lithium aluminosilicate (LAS) system are widely employed in dentistry; yet optimizing their clinical performance requires specific control of heat treatment parameters. This study aims to investigate the impact of varied processing parameters on the resulting microstructure, mechanical properties, and surface roughness of these materials. The methodology involves systematic control of nucleation temperature (520°C) and crystallizations temperatures (750°C) and (900°C). Materials were micro-structurally characterized and investigated using X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM); mechanically using Knoop hardness tests and ultrasound wave velocity (to obtain an elastic modulus; and physically using a surface roughness tester. XRD confirmed the presence of LiAlSi₂O₆ as the main phase and Li₂Si₂O₅ as a minor phase. Furthermore, the optimal heat treatment of glass-ceramics significantly increased the knoop hardness amounted to ~ 7.66±0.44GPa and the elastic modulus to ~ 96.35±0.50GPa. Surface roughness analysis also revealed a minimum (Ra) of 0.34±0.04μm for the specific heat treatment

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