Dense mullite ceramic bodies and process of manufacture

Details Dense mullite ceramic bodies and process of manufacture Dense mullite ceramic bodies and process of manufacture

1975-06-02

1976-11-02

Arnold, Donald J.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

106 733, 106 734, 106 735, 264125, C04B 3564, C04B 3510

Patent

active

039897834

ABSTRACT:
Dense mullite ceramic bodies are manufactured from a mullite-proportioned mixture of alumina (Al.sub.2 O.sub.3) and silica (SiO.sub.2) containing a critically small amount of titania (TiO.sub.2). The preferred concentration of titania based on the mullite (Al.sub.6 Si.sub.2 O.sub.13) is from 0.5 to 1.0% by weight, which by means of a specific sequence of processing steps results in mullite bodies having densities of 2.5 g./cc. or greater. More specifically, a molecularly intermixed mixture is calcined at a temperature of 900 to 1150.degree. C. to convert the mixture to mullite in intimate association with the small percentage of titania, which is present essentially as fine titania crystals. The calcined mullite is ground to break up the aggregates and obtain a mixture of essentially discrete crystals of mullite and titania. The ground mixture is formed into the shape of the desired bodies, and the bodies are heated at an effective sintering temperature to produce the dense mullite bodies.

REFERENCES:
mcGee et al., "Mullitization of Alumino-Siliate Gels," Cer. Bull., vol. 51, No. 7 (1972) pp. 577-581.
Augustinik et al., "Mineralizugushcheye deystvige dvuokisi titana na proters mirtktigotsie v kamennokeramicheskikl mansokh," Izvesltiya vysshilch uchebnykh zavedeniy, vol. XIII, No. 1, 1970 pp. 400-402, Translation supplied.

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