| 摘要 |
An amorphous ceramic glass composition having a density greater than about 2.1 g/cm3 comprises: between about 35 and 55% by weight SiO2; between about 18 and 28% by weight Al2O3; between about 1 and 5% by weight CaO; between about 7 and 14% by weight MgO; between about 0.5 and 5% by weight TiO2; between about 0.4 and 3% by weight B2O3; and greater than 0 and up to about 1% by weight P2O5. A convenient source of raw materials is a mixture of coal ash waste, borax (or boric acid) manufacturing plant waste, and titanium pigment waste. The ceramic glass is formed from an intermediate ceramic mixture which is subjected to a heat treatment. The intermediate ceramic mixture is formed by heating a mixture containing SiO2, Al2O3, CaO, MgO, TiO2, B2O3, and Na4P2O7 to a temperature between about 1400 DEG and 1600 DEG C.; cooling the mixture at a controlled rate between about 15 DEG C. and about 30 DEG C. to solidify it; annealing the mixture at a temperature between about 600 DEG and 670 DEG C. in an atmosphere containing oxygen; and cooling the mixture to a temperature less than about 400 DEG C. at a cooling rate between about 15 DEG and 30 DEG C. per hour. The intermediate ceramic mixture is first heated to a temperature of between about 850 DEG and 1000 DEG C. at a heating rate of between about 1 DEG and 2 DEG C. per minute, and then sintered at a temperature between 850 DEG to 1000 DEG C. for a time period sufficient to increase its density to at least about 2.1 g/cm3.
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