To obtain a magnesia-carbonaceous unburned brick applied magnesia covered with pitch and capable of utilizing its antispalling properties and corrosion resistance and improving wear and abrasion resistance.
This magnesia-carbonaceous unburned brick is obtained by adding 0.5-5 pts.wt. Al metal and/or Al-based alloy to 100 pts.wt. refractory aggregate, kneading the resultant mixture and, thereafter, pressure forming and drying the mixture by heating wherein the refractory aggregate contains 10-80 wt.% magnesia covered with a pitch component containing 5-80 wt.% Al metal and/or Al-based alloy, 1-20 wt.% graphite and 10-60 wt.% magnesia. The Al metal and/or Al-based alloy reacts with carbon of the pitch component at high temperature and the resultant aluminum carbide (Al4C3) increases conformation strength of the covering pitch and improves wear and abrasion resistance of the brick.
KONO KOJI
SAKAMOTO HIROSHI
NAKAMURA HISASHI
KASAHARA HAJIME
TAKEUCHI KIMIHIKO
MAEKAWA AKIYOSHI
KUROSAKI HARIMA CORP
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