ON THE MODULUS OF ELASTICITY OF MAGNESITE REFRACTORIES. XI:Influence of Firing Temperature Upon the Resistance to Thermal Shock

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Test pieces were formed of a coarse body and of a fine one, both prepared of a Manchurian magnesite clinker, and were then fired to temperatures varying from cone 12 to 28. Their physical properties such as fire-shrinkage, absorption, porosity, apparent sp. gr., and bulk sp. gr. have been examined. Then their spalling tendencies have been determined by the method described in Part X and also the numerical values of the ratio of modulus of rupture to modulus of elasticity have been computed.(1) The spalling tendencies determined directly have been lowest for the firing temperatures of cones 14 to 16 and have risen abruptly with increasing vitrification at higher temperatures.(2) The rise of the spalling tendencies due to vitification have been gradual for the coarse body and sudden for the fine body.(3) Even magnesite refractories fired adequately may lose their spalling resistance in service by vitrification caused by the action of slag, flame, etc.(4) On the contrary, the calculated resistance to thermal shock is increased with increasing firing temperatures.
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