マグネシア耐火物特性の粒度分布依存性
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概要
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Packing experiment by press moulding with various pressures on high purity sea-water magnesia grain mixes corresponding to the Andreasen continuous-grading below 4mm showed that the q of mix for the closest packing (qρm) shifted from 0.3 to 0.4 as pressure got higher, because a body with a higher q would have a higher degree of crushing of grain, and degree of crushing was less than roseki and silicon carbide grain.Batch compression equations the Kawakita equation in particular were examined with using the packed density by packing method with stick penetration for the initial density, and it was found that the coefficient could be expressed as a function of q.When the moulded mixes were fired at SK 18# and SK 34#, the qρm shifted from 0.4 to 0.2 as firing temperature got higher, because a body with a lower q have a higher firing shrinkage as firing temperature got higher. And it was proved that the firing shrinkage of a body could be expressed as a function of q. On the other hand, a closed pore was increased as firing temperature and q got higher respectively.Thus from the relation above, it was proved that the packing density of fired body could be expressed as a function of q and applied pressure with the packed density by stick penetration, in its turn, with that of calculation by previous report.Attempts at a grading has removal tendency of intermediate component from continuous-grading showed to be ineffective for obtaining a closer packing, lower permeability and higher hot-strength.On the other hand, a spring back phenomenon was noticed in press moulding, but that of continuous-grading was smaller than that of a grading has removal tendency of intermediate component. It was predicted from the results that the continuous-grading would be more adequate for achieving the closer packing with more high pressure.From the results, for achieving the closer packing, the lower closed porosity, the lower permeability and the higher hot-strength, the grading should be continuous-grading and the q of mix should be 0.2-0.3.
- 社団法人日本セラミックス協会の論文
- 1973-08-01
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