Method of ceramic molding which produces a porosity gradient and

Details Method of ceramic molding which produces a porosity gradient and Method of ceramic molding which produces a porosity gradient and

1985-12-03

1987-12-01

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 88, 501 89, 501 90, 501153, 501154, 264 69, 264 70, 264 71, 264DIG19, C04B 3502, C04B 3580

Patent

active

047104805

ABSTRACT:
The invention relates to a ceramic molding which is manufactured from high-temperature resistant, fire-resistant or refractory fibers and fine-grain, fire-resistant or refractory materials and, in certain cases, from other customary additives. The ceramic molding is characterized by the fact that its porosity gradually and continuously increases along an axis of the molding from less than 20% to more than 70%. The areas with low porosity comprise the fine-grain, fire-resistant or refractory materials. The areas of high porosity comprise ceramic fiber, such as, fibers of Al.sub.2 O.sub.3, SiO.sub.2, ZrO.sub.2, C, SiC or mixtures thereof. The intermediate areas are constructed of mixtures of ceramic fiber and fire-resistant or refractory materials. The invention also relates to the use of such a ceramic molding method for the manufacture of compound moldings saturated or infiltrated with organic resins, pitch, tar, metals, metal alloys or glasses.

REFERENCES:
patent: 2897572 (1959-08-01), Hansen
patent: 3060543 (1962-10-01), Shaw
patent: 3103722 (1963-09-01), Whitehurst et al.
patent: 3371135 (1968-02-01), Goodwin
patent: 3468997 (1969-09-01), Dickels
patent: 3585094 (1971-06-01), Ruggler
patent: 3754059 (1973-08-01), Prandtl et al.
patent: 3989795 (1976-11-01), McGee
patent: 3993495 (1976-11-01), Galliath et al.
patent: 4296065 (1981-10-01), Ishii et al.
patent: 4514346 (1985-04-01), Luhleich et al.

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