Method of making a high strength semicrystalline article
First Claim
1. A METHOD OF MANUFACTURING A SEMICRYSTALLINE CERAMIC BODY POSSESSING A MODULUS OF RUPTURE WHEN ABRADED OF AT LEAST ABOUT 40,000 P.S.I. AND A LINEAR THERMAL EXPANSION COEFFICIENT OF BETWEEN ABOUT 100 AND 120X10**-7/*C. WHICH COMPRISES MELTING A GLASS-FORMING COMPOSITION CONSISTING ESSENTIALLY, BY WEIGHT, OF ABOUT 40-68% SIO2, 8-32% AL2O3, 7-14% TIO2, AND 8.5-23% MGO, SIMULTANEOUSLY COOLING THE MELT AT LEAST BELOW THE TRANSFORMATION POINT OF SAID MELT AND FORMING A GLASS SHAPE THEREFROM, THEREAFTER HEATING THE GLASS SHAPE TO A TEMPERATURE OF BETWEEN 990*C. AND 1160*C. FOR A TIME AS DEFINED BY THE AREA A-B-C-D-E-F-G-H-I-J-K-L-M-N-A IN FIGURE 1 TO OBTAIN THE DESIRED CRYSTALLIZATION, AND THEN COOLING SAID SHAPE TO ROOM TEMPERATURE.
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1 Claim
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1. A METHOD OF MANUFACTURING A SEMICRYSTALLINE CERAMIC BODY POSSESSING A MODULUS OF RUPTURE WHEN ABRADED OF AT LEAST ABOUT 40,000 P.S.I. AND A LINEAR THERMAL EXPANSION COEFFICIENT OF BETWEEN ABOUT 100 AND 120X10**-7/*C. WHICH COMPRISES MELTING A GLASS-FORMING COMPOSITION CONSISTING ESSENTIALLY, BY WEIGHT, OF ABOUT 40-68% SIO2, 8-32% AL2O3, 7-14% TIO2, AND 8.5-23% MGO, SIMULTANEOUSLY COOLING THE MELT AT LEAST BELOW THE TRANSFORMATION POINT OF SAID MELT AND FORMING A GLASS SHAPE THEREFROM, THEREAFTER HEATING THE GLASS SHAPE TO A TEMPERATURE OF BETWEEN 990*C. AND 1160*C. FOR A TIME AS DEFINED BY THE AREA A-B-C-D-E-F-G-H-I-J-K-L-M-N-A IN FIGURE 1 TO OBTAIN THE DESIRED CRYSTALLIZATION, AND THEN COOLING SAID SHAPE TO ROOM TEMPERATURE.
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Current AssigneeCharles B. King, Philip Goodman
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Original AssigneeCharles B. King, Philip Goodman
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InventorsGoodman, Philip, King, Charles B.
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Application NumberUS04/347,501Time in Patent Office818 DaysField of SearchUS Class Current65/33.7CPC Class CodesC03C 10/0045 containing SiO2, Al2O3 and ...
