Effect of Alumina Reactivity on the Densification and Properties of Al2O3–Cr2O3 Refractories |
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| Authors: | Mithun Nath Vakiti Pradeep Reddy Somnath Sinhamahapatra Kausik Dana Arup Ghosh Himansu Sekhar Tripathi |
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| Affiliation: | 1. Refractories Division, CSIR–Central Glass & Ceramic Research Institute, Jadavpur, Kolkata, India;2. Advance Clay and Traditional Ceramics Division, CSIR–Central Glass & Ceramic Research Institute, Jadavpur, Kolkata, India |
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| Abstract: | Alumina‐chrome (Al2O3–Cr2O3) refractories with Al2O3:Cr2O3 molar ratio 1:1 were synthesized in the temperature range of 1400–1700°C by conventional solid–oxide reaction route. The effect of different aluminas (viz., hydrated and calcined) on the densification, microstructure, and properties of Al2O3–Cr2O3 refractories was investigated without changing the Cr2O3 source. The starting materials were analyzed to determine the chemical composition, mineralogy, density, surface area, and particle size. Sintered materials were characterized in terms of densification, phase assemblage, and mechanical strength at room temperature and at higher temperatures. Microstructural evolution at different sintering temperature was correlated with sintering characteristics. It can be concluded that the Al2O3–Cr2O3 refractories prepared with hydrated alumina as Al2O3 source show better densification and hot mechanical strength than corresponding calcined variety. |
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