Abstract A refractory composition consisting essentially of 20-80 per cent carbon 4-30 percent silicon for ferrosilicon, and the balance of clay, grog, alumina, bentonite, bauxite or zircon. This composition is formed to a desired shape and fired at a temperature of 2,400*F - 3,200*F. Preferably the shaped composition is heated quickly through a temperature of 800*F 2,500*F in no more than 4 hours and fired at above 2,500*F for at least 3 hours. Instead of firing the brick the composition may include chemical bonding agents such as sodium silicate, aluminum phosphates, ammonium phosphates and phosphoric acid, and the shaped composition simply dried to remove water and form a bonded article.
THE METHOD OF PRODUCING A HIGH STRENGTH OXIDATION RESISTANT SHAPED ARTICLE WHICH COMPRISES FORMING A COMPOSITION CONSISTING ESSENTIALLY OF 20-80 PERCENT BY WEIGHT OF AMORPHOUS CARBON OR GRAPHITE, 5-30 PERCENT SILICON OR FERROSILICON AND THE BALANCE OF CLAY, GROG, ALUMINA, BENTONITE, BAUXITE, ZIRCON OR MIXTURES THEREOF TO SHAPE, AND HEATING THE SHAPED COMPOSITION THROUGH A TEMPERATURE OF 800*F-2,500*F IN NO MORE THAN FOUR HOURS AND THEN HEATING AT ABOVE 2,500*F FOR AT LEAST THREE HOURS.
Claim 2
Independent Claim
75 words
THE METHOD OF PRODUCING A HIGH STRENGTH OXIDATION RESISTANT SHAPED ARTICLE WHICH COMPRISES FORMING A COMPOSITION CONSISTING ESSENTIALLY OF 20-80 PERCENT BY WEIGHT OF AMORPHOUS CARBON OR GRAPHITE, 5-30 PERCENT SILICON OR FERROSILICON AND THE BALANCE OF CLAY, GROG, ALUMINA, BENTONITE, BAUXITE, ZIRCON OR MIXTURES THEREOF TO SHAPE, AND HEATING THE SHAPED COMPOSITION THROUGH A TEMPERATURE OF 800*F-2,500*F IN NO MORE THAN FOUR HOURS AND THEN HEATING AT ABOVE 2,500*F FOR AT LEAST THREE HOURS.