Abstract
Al2O3-ZrO2 ceramics containing 5-50 mol% ZrO2 were prepared by solid state reaction method. The bulk density, average grain size and microhardness of Al2O3-ZrO2 ceramics system as function of ZrO2 content were investigated. The dense Al2O3-ZrO2 ceramics were successfully by means of carefully control processing parameters that include sintering temperature and heating/cooling rates. These ceramics with higher ZrO2 content was obtained high bulk densities and small grain sizes. However, the high hardness values were exhibited from Al2O3-ZrO2 ceramics with dopants ZrO2 between 1-10mol% and its tend to decrease with concentration of ZrO2. It can be found that the fast heating/cooling rates are controlled grain growth and obtained high hardness in materials. The results gave good correlation between stoichiometry characteristics, heating/cooling rates in sintering and microstructure of fabricated dense and mechanical properties.
Highlights
The most widely used ceramic materials are alumina, Al2O3 and zirconia, ZrO2, because of their excellent bio-compatibility
Tetragonal zirconia in alumina matrix is known as Zirconia Toughened Alumina (ZTA)
Some researchers have focused their attention on optimal addition ZrO2 into Al2O3 to enhance good mechanical property[10]
Summary
The most widely used ceramic materials are alumina, Al2O3 and zirconia, ZrO2, because of their excellent bio-compatibility. To obtain stoichiometric ZTA, different preparative method have been introduced, such as hydrothermal[7], mixed oxide[8], and gel casting[9]. All these techniques are aim to improve properties of Al2O3-ZrO2 ceramics. Some researchers have focused their attention on optimal addition ZrO2 into Al2O3 to enhance good mechanical property[10]. They have found that the sinterability of the ceramics matrix is reduced when a large amount of second phase is added[11]. The effect of heating/cooling rates in sintering conditions on densification, grains size and hardness are investigated in this connection
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