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J. Korean Ceram. Soc. > Volume 58(1); 2021 > Article
Journal of the Korean Ceramic Society 2021;58(1): 42-49.
doi: https://doi.org/10.1007/s43207-020-00083-4
Effect of MgO on physical and mechanical properties of dental porcelain
M. Abdul Kaiyum, Adnan Ahmed, Md Hasib Hasnat, Suhanur Rahman
Department of Glass & Ceramic Engineering (GCE), Rajshahi University of Engineering & Technology (RUET), Rajshahi 6204, Bangladesh
Correspondence  M. Abdul Kaiyum ,Email: kaiyum@gce.ruet.ac.bd
Received: March 13, 2020; Revised: August 30, 2020   Accepted: September 17, 2020.  Published online: January 31, 2021.
ABSTRACT
The aim of this work is to investigate the effect of MgO on physical and mechanical properties of Dental Porcelain. MgO was used in this work as particle reinforcement to improve these properties. 0.5, 1.0 and 1.5 weight percentages of MgO were reinforced in Dental Porcelain (75 wt% feldspar, 20 wt% quartz and 5 wt% kaolin). The samples were made by powder pressing process and sintered in one step sintering technique and sintered at three different temperatures (1050 °C, 1100 °C and 1150 °C). The prepared samples were tested by using X-Ray Fluorescence (XRF), Scanning Electron Microscope (SEM) and Differential Scanning Calorimeter (DSC), Universal Testing Machine (UTM) X-Ray Diffraction (XRD) and Vickers Hardness Tester to characterize the chemical composition, microstructure and phases present, fracture toughness, hardness respectively. Physical and mechanical properties such as density, hardness, diametral tensile strength, flexural strength and fracture toughness were determined. The addition of MgO up to 1% in 1100 °C influences all the physical and mechanical properties which was positive, where further addition of MgO showed adverse effect.
Key words: Dental porcelain · Fracture toughness · Diametral tensile test · Hardness · Grain growth
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