Abstract
The composition and properties of the patching material made in the U.S.A., was investigated.
The results are as follows;
(1) Refractorieness SK26;
chemical composition; SiO2 85.50∼87.89% Al2O3 7.71∼8.04%, Fe2O3 0.63∼0.93%.
(2) The distribution of the sizes of the grains is composed of about 45% of coarse grain (1,000μ up), about 20% of middle grain (1000∼149μ), and about 35% of fine grain (under 149μ)
These grains were tested by chemical analysis, polarized microscope and X-ray diffraction pattern, and it was found that the coarse grain and middle size grain are quartz and fine grain consists of quartz and clay substance, which has a tendency of expansion when heated.
(3) The patching material was heated at SK10 (1300°C) for one hour, the resulted material was compared with the raw material as in the following table.
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(4) The Compresive strengths after aging are as follows:
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