Effects of Rare Earth Oxides on Microstructures and Properties of Magnesia Refractories

Zhang, Bao Guo; Wang, Zhou Fu; Zhang, Shao Wei; Wang, Xi Tang; Xu, Zi wei

doi:10.4028/0-87849-473-1.1158

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“…To address the problem of poor thermal shock resistance and high thermal conductivity of magnesia, several researchers have suggested inclusion of different additives, such as SiO 2 , Al 2 O 3 , Cr 2 O 3 , TiO 3 , ZrO 2 , MgCl 2 , and WO 3. Microstructural and thermo‐mechanical characteristics of sintered Indian magnesite with titania were studied by some researchers . The addition of very small amount of ilmenite, Fe 2 O 3 , and ZrO 2 in natural Indian magnesite and effect of these on the microstructural evolution of magnesite were studied by Chaudhuri et al They reported that titania and ilmenite addition leads to the formation of calcium titanate for both the cases.…”

Section: Introductionmentioning

confidence: 99%

Effect of ZrO₂on the densification behavior and properties of Indian magnesite

Ghosh

Sinhamahapatra

Tripathi

2018

Int J Applied Ceramic Tech

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Natural magnesite is the primary source for magnesia‐based refractory materials. India has vast deposits of magnesite in Salem and Almora regions. However, due to the presence of large amount of impurities which forms low‐melting compounds at elevated temperature, its high‐temperature application is restricted. Raw magnesite was evaluated in terms of chemical analysis, differential thermal analysis, thermogravimetric analysis, and phase assemblage. Zirconia (1‐5 wt %) was added to Indian natural magnesite of Salem region to minimize the low‐melting phase formation at high temperatures. Samples were sintered in the temperature range of 1550‐1700°C. Sintered samples were characterized in terms of densification, mechanical and thermo‐mechanical properties, phase assemblage, and microstructure. It was found that the addition of zirconia reduced the formation of detrimental phases like monticellite and thereby improved the high‐temperature mechanical properties.

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Section: Introductionmentioning

confidence: 99%