ON THE MODULUS OF ELASTICITY OF MAGNESITE REFRACTORIES. XII:Influence of the Amount of Fine Powder And Forming Pressure on the Resistance to Thermal Shock
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Two series of magnesite refractories, one fired adequately or insufficiently and another vitrified, have been examined for the ratio of modulus of rupture to modulus of elasticity (R) as well as for spalling tendency (S). A comparatively pure magnesite clinker and an easily vitrifiable one were used. Test pieces were made of bodies of 90 to 0% of coarse grain and 10 to 100% of fine powder. Both coarse grain and fine powder were prepared to have each constant fineness. The batches were wetted with an aqueous solution of magnesium sulphate and were pressed with pressures varying from 2 to 1000kg. per sq. cm.The following conclusions may be justified by the results of the experiments:(1) The resistance of magnesite refractories to thermal shock changes quickly on vitrification. Properties of the vitrified refractories are more important than those of unvitrified ones, since the refractories are usually vitrified in service.(2) If the refractories are not vitrified, the more the amount of the fine powder the more the numerical value of S; S and R decrease with an increase of the forming pressure.(3) S increases on vitrification. The smaller the amount of the fine powder and the forming pressure the smaller the rate of the increase. The increase is rapid as the amount of the fine powder and the forming pressure increase.(4) The effects of the amount of the fine powder and the forming pressure for nonvitrified refractories are quite reverse to those for vitrified ones.(5) With vitrified refractories, the effect of the forming pressure is slight for coarsely grained specimens while spalling tendency of fine grained ones is rapidly reduced by an increase of the forming pressure.(6) S can be reduced by an adequate increase of the forming pressure and by a decrease of the fine powder or better by pressing weakly batches mainly composed of the fine powder.
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公益社団法人 日本セラミックス協会 | 論文
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