Conclusions
The porosity of refractories made from fused materials can be greatly reduced (to 10–13%) by using increased fabrication pressures and coarse grained bodies with low quantities of finely milled bond (10–15%).
The densification mechanism in the coarse-grained bodies consists in breaking up the large grains and redistributing them. The requirement for maximum density of packing in selecting the grain-size composition of the bodies is of first rate importance.
The maximum fabrication pressure should not exceed the values at which the critical density is reached.
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Literature cited
V.L.Balkevich et al., Trudy D.I. Mendeleev MKhTI, No.59, 163 (1969).
R.Ya.Popil'skii and F.V.Kondrashev, Pressing Ceramic Powders [in Russian], Metallurgiya (1968), p. 125.
A.S.Berezhnoi, Ogneupory, No.3, 124 (1947).
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Translated from Ogneupory No.6, pp.49–53, June, 1972.
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Balkevich, V.L., Surkova, I.A., Korshunov, V.S. et al. Using increased fabrication pressures for making articles from certain electrofused highly refractory materials. Refractories 13, 398–401 (1972). https://doi.org/10.1007/BF01284866
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DOI: https://doi.org/10.1007/BF01284866