THE EFFECT OF ALUMINIUM BORATE AND MAGNESIA ON THE MECHANICAL PROPERTIES AND MICROSTRUCTURE OF CORUNDUM- MULLITE BODIES

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NOROZI NAJMEH; NAGHIZADEH RAHIM; REZAYI HAMIDREZA; GHASEMI EBRAHIM

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Journal: CERAMIC SCIENCE & ENGINEERING Year:2016 | Volume:4 | Issue:4 Page(s): 79-92

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Title

THE EFFECT OF ALUMINIUM BORATE AND MAGNESIA ON THE MECHANICAL PROPERTIES AND MICROSTRUCTURE OF CORUNDUM- MULLITE BODIES

Author(s)

NOROZI NAJMEH | NAGHIZADEH RAHIM | REZAYI HAMIDREZA | GHASEMI EBRAHIM | Issue Writer Certificate

Keywords

ALUMINIUM BORATEQ2

CORUNDUMQ1

MULLITEQ2

MAGNESIAQ2

MECHANICAL PROPERTIESQ2

Abstract

The CORUNDUM-mullite bodies have high refractoriness under load and resistance to creep. Different additives have been used in these bodies for improvement of sintering and microstructure. In this study, the effect of ALUMINIUM BORATE and MAGNESIA additive on MECHANICAL PROPERTIES and sintering of alumina-mullite composite were investigated. Aluminum borate (9Al2O3.2B2O3) was prepared by the combustion of an aqueous solution containing stoichiometric amounts of aluminum nitrate, boric acid, and glycine. Tabular and gamma alumina, kaolin, and additives were mixed, pressed and then fired at 1400- 1500°C/3h for preparation of CORUNDUM-mullite samples. After firing the samples (without additives) at 1550°C/3h, bending strength (38 MPa), relative density (88%) with CORUNDUM and MULLITE as major phase and quartz as minor phase were obtained. After firing ALUMINIUM BORATE samples at 1550°C/3h due to high refractories of A9B2 the physical and MECHANICAL PROPERTIES weren' t increased.With addition of 2.5wt% ALUMINIUM BORATE and 2.5wt% MAGNESIA, after firing at 1550oC/3h, bending strength and relative density were improved and reach to 115Mpa and 95.5Mpa respectively. At this sample, CORUNDUM, MULLITE, pyrope (3MgO.Al2O3.3SiO2) and MAGNESIA borate (2MgO.B2O3) were established at the sample.

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APA: Copy

NOROZI, NAJMEH, NAGHIZADEH, RAHIM, REZAYI, HAMIDREZA, & GHASEMI, EBRAHIM. (2016). THE EFFECT OF ALUMINIUM BORATE AND MAGNESIA ON THE MECHANICAL PROPERTIES AND MICROSTRUCTURE OF CORUNDUM- MULLITE BODIES. CERAMIC SCIENCE & ENGINEERING, 4(4), 79-92. SID. https://sid.ir/paper/227856/en

Vancouver: Copy

NOROZI NAJMEH, NAGHIZADEH RAHIM, REZAYI HAMIDREZA, GHASEMI EBRAHIM. THE EFFECT OF ALUMINIUM BORATE AND MAGNESIA ON THE MECHANICAL PROPERTIES AND MICROSTRUCTURE OF CORUNDUM- MULLITE BODIES. CERAMIC SCIENCE & ENGINEERING[Internet]. 2016;4(4):79-92. Available from: https://sid.ir/paper/227856/en

IEEE: Copy

NAJMEH NOROZI, RAHIM NAGHIZADEH, HAMIDREZA REZAYI, and EBRAHIM GHASEMI, “THE EFFECT OF ALUMINIUM BORATE AND MAGNESIA ON THE MECHANICAL PROPERTIES AND MICROSTRUCTURE OF CORUNDUM- MULLITE BODIES,” CERAMIC SCIENCE & ENGINEERING, vol. 4, no. 4, pp. 79–92, 2016, [Online]. Available: https://sid.ir/paper/227856/en

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