| 摘要 |
<p>A ceramic glass composition 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° and 1600 °C; cooling the mixture to solidify it; annealing the mixture at 600° to 670 °C in an atmosphere containing oxygen; and cooling the mixture to a temperature less than about 400 °C at a cooling rate less than about 30 °C per hour. The intermediate ceramic mixture is first heated to a temperature of between about 850° and 1000 °C at a heating rate of between about 1° and 2 °C per minute, and then sintered at a temperature between 850° to 1000 °C for a time period sufficient to increase its density to at least about 2.1 g/cm3.</p> |
