Microcellular ceramic material and process for manufacture there

Details Microcellular ceramic material and process for manufacture there Microcellular ceramic material and process for manufacture there

1982-10-13

1984-10-09

Lesmes, George F.

Dentistry

Prosthodontics

Tooth construction

433228, 106 35, 428392, 428294, 428296, C09K 300

Patent

active

044758928

ABSTRACT:
Microcellular ceramic material comprises a plurality of elongated vitreous micro sized ceramic rods which are placed in side-by-side touching relation and define elongated lines of contact therebetween. The rods also define interstices therebetween which may be void or may be filled or substantially filled with vitreous fibers, polymer materials, acid soluble or insoluble vitreous fibers and other suitable fibers. The rod mass either so filled or unfilled is first fused at the lines of rod contact by elevated temperature and is then annealed to cause the ceramic fibers to crystallize and form an elongated porous crystalline log. The log is then sectioned transversely or linearly to form thin wafers which in turn are built up in layers which are fused to form useful integral composite cellular objects. Through use of selectively arranged colored fibers the transversely sectioned wafers will have controlled microdots of color to provide the object with controlled color characteristics. Where polymer material is employed to fill the interstices, it may contain color pigments to achieve desired color characteristics.

REFERENCES:
patent: 3796627 (1974-03-01), Maizocchi
patent: 3869335 (1975-03-01), Siefert
patent: 4248936 (1981-02-01), Maizocchi et al.
patent: 4250221 (1981-02-01), Pfeffer
patent: 4278630 (1981-07-01), Scheicher
patent: 4321042 (1982-03-01), Scheicher

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