Effect of MgO on physical and mechanical properties of dental porcelain
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ORIGINAL ARTICLE
Effect of MgO on physical and mechanical properties of dental porcelain M. Abdul Kaiyum1 · Adnan Ahmed1 · Md Hasib Hasnat1 · Suhanur Rahman1 Received: 13 March 2020 / Revised: 30 August 2020 / Accepted: 17 September 2020 © The Korean Ceramic Society 2020
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. Keywords Dental porcelain · Fracture toughness · Diametral tensile test · Hardness · Grain growth
1 Introduction Dental porcelain is developed for dental applications. Most of ceramic materials are inert, high hardness, high compressive strength with very low fracture toughness for its brittleness behavior. So it is safe to use it as a biomaterials. Brittleness and low fracture toughness of ceramic materials are still very concerning for researchers. A lot of researchers and material engineers are trying to develop the mechanical properties of ceramics especially to spread their applications. Ceramic materials can be used as thin veneers, crowns, inlays and bridges [1] in biomedical sector. SiC exhibits modulus of elasticity 414 GPa and glass 69 GPa [2] which is remarkable for SiC but concerning for glass. Typical fracture toughness (KIc) value of zirconia ranges from 7 to 8 MPa m1/2 and for Al2O3 ranges from 4.0 to 5.0 MPa m1/2. In glass-resin composite maximum fracture toughness was found 1.84 MPa m 1/2 and it was 0.5 MPa m 1/2 for glass * M. Abdul Kaiyum [email protected] 1
Department of Glass & Ceramic Engineering (GCE), Rajshahi University of Engineering & Technology (RUET), Rajshahi 6204, Bangladesh
polyalkenoate cements [3–5]. The fracture toughness of brittle ceramics can be improved by the addition of particles and whiskers/fiber [6]. Traditional approaches to the development of fracture test methods for ceramics have focused on specimen designs or artificially induce a certain amount of stable crack growth during quasi-static loading [7]. It was found in 1976 that
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