| Influence of Additives on Microstructural Development and Sinterability of Almora Magnesia |
Ritwik Sarkar, Summit Kumar Oram and Satyam Kumar
Pages : 45-54
DOI: 10.1080/0371750X.2026.2630160 |
| Abstract |
| Natural magnesite is the primary source for the production of basic refractories and
also has certain other industrial uses. India possesses significant magnesite reserves,
particularly in the Salem and Almora regions. However, the presence of impurities
such as lime, silica and iron oxide in these deposits restricts their use in high-
temperature applications. In the present work, the microstructural development and
sintering behaviour of dead-burnt fine Almora magnesia is studied between 1550o
and 1650oC, and also in the presence of 2 wt% of Al2O3
, Cr2O3
and ZrO2
. The sintered
products were evaluated for densification, strength and thermal shock resistance
studies. Also, phase analysis and detailed microstructural evaluation were done.
Calcium-containing multicomponent silicates are found to form from the impurities
in the matrix part, affecting the properties. Al2O3
addition did not show much benefit,
but Cr2O3
and ZrO2
additions showed reduction in the low melting phase in the matrix
and significant enhancement in thermal shock resistance for Cr2O3
containing spinel
and tetragonal ZrO2 phase formation, respectively. |
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