Shaped bodies of transparent, polycrystalline alumina

Details Shaped bodies of transparent, polycrystalline alumina Shaped bodies of transparent, polycrystalline alumina

1991-11-14

1993-09-07

Silbaugh, Jan H.

Dentistry

Orthodontics

433 8, 501127, 264 12, 264 16, 264 65, 264 66, A61C 300

Patent

active

052422984

ABSTRACT:
Shaped bodies of transparent, polycrystalline alumina are produced in a green body is formed in a first step using pure, fine-grained alumina wherein, in the given circumstances, the green body is freed from the auxiliary agents used int he production by burning-out in a second step, wherein pretreat is carried out as a subsequent third step, and wherein the compaction to transparent, polycrystalline alumina takes place in a fourth step, in order to render the method more economical, it is suggested that the pretreatment be carried out in such a way as to produce a closed surface on the shaped body and that pressure from all sides at elevated temperature be used to compact the shaped body in the fourth step.

REFERENCES:
patent: 3562371 (1971-02-01), Bush
patent: 3853971 (1974-10-01), Hardtl et al.
patent: 4219617 (1980-08-01), Wallshein
patent: 4322206 (1982-03-01), Reynolds
patent: 4323545 (1982-04-01), Sellers
patent: 4639218 (1987-01-01), Jones et al.
patent: 4954080 (1990-09-01), Kelly et al.

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