High-strength glass ceramic containing apatite crystals and a la

Details High-strength glass ceramic containing apatite crystals and a la High-strength glass ceramic containing apatite crystals and a la

1986-04-30

1987-03-24

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

65 33, 4332011, 501 10, 623 18, C03C 1004

Patent

active

046525343

ABSTRACT:
Glass ceramic comprising apatite crystals and at least 50% by weight of wollastonite crystals and a process for producing the same are disclosed. The glass ceramic contains from 45 to 56% by weight of CaO, from 1 to less than 10% by weight of P.sub.2 O.sub.5, from 30 to 50% by weight of SiO.sub.2, from 0 to 5% by weight in total of one or two of MgO and Y.sub.2 O.sub.3, and from 0 to 5% by weight of one or more of F.sub.2, Na.sub.2 O, K.sub.2 O, Li.sub.2 O, Al.sub.2 O.sub.3, TiO.sub.2, ZrO.sub.2, SrO, Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5, with the total content of CaO, P.sub.2 O.sub.5 and SiO.sub.2 being at least 90% by weight. The glass ceramic exhibits excellent biocompatibility and has improved strength.

REFERENCES:
patent: 3981736 (1976-09-01), Broemer et al.
patent: 4120730 (1978-10-01), Trojer et al.
patent: 4366253 (1982-12-01), Yagi
patent: 4417912 (1983-11-01), Abe
patent: 4560666 (1985-12-01), Yoshida et al.

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