Physical Properties of Alumina and Zirconia Based Ceramics Doped with MgO and TiO2

Abstract

Ceramics is an inorganic, non-metallic material which is composed of oxides,   carbides, nitrides, borides having significant structural, mechanical, thermal and electrical properties. Ceramics materials have excellent biocompatible properties such as bioactive, bio-inert and biodegradable properties which are desirable in the progress and enhancement of human civilization. Now a day’s the most widely used ceramics materials are Alumina (Al₂O₃) and Zirconia (ZrO₂) based ceramics. The current developments in ceramic materials science for dental applications led to high class mechanical strength materials which are represented by these materials. It has excellent biocompatibility and long-term potential durability. The main advantage of alumina is high hardness and wears resistance and zirconia has higher strength and fracture toughness properties. Magnesium oxide and Titanium dioxide has also been considered the most useful material because of their excellent physical properties and biocompatibility. In addition of MgO and TiO₂ with Al₂O₃ -ZrO₂ composite play an important role to improve their physical properties (Microstructure, Mechanical, and Electrical properties).

Several experimental observations revel that composite of Alumina (Al₂O₃) and Zirconia (ZrO₂) possess excellent mechanical properties including improved hardness, toughness, bending strength etc. Mechanical properties of composites are much affected by the shapes, sizes and relative density of bulk-grains, and these parameters are governed by doping condition, doping materials, sintering temperatures etc. In this work, the composite Al₂O₃- ZrO₂ has been doped with Magnesium Oxide (MgO) and Titanium-oxide (TiO₂) at different wt%. The sintering temperature was kept fixed as 1650⁰C for each composite. Since MgO and TiO₂ possess low dielectric losses besides mechanical and morphological studies, electrical properties of these composites have also been observed. The result shows that the average grain size decreases with increase in additive different wt% of MgO and TiO₂.The hardness and flexural strength of the composite tends to increase with the additive different wt%. And the electrical properties (dielectric constant, resistivity and conductivity etc.) also vary with the different wt% of MgO and TiO₂.

• Supervision