Glass-ceramics containing lithium disilicate and tridymite

Details Glass-ceramics containing lithium disilicate and tridymite Glass-ceramics containing lithium disilicate and tridymite

1994-06-24

1998-04-28

Kiliman, Leszek

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428 642, 428 643, 428 644, 428 653, 428694ML, 428694ST, 428694SG, 428900, 501 3, 501 4, 501 5, 501 6, 501 7, 501 8, 501 9, G11B 566

Patent

active

057442088

ABSTRACT:
This invention is directed at the makings of glass-ceramic which is uniquely suited for use as a disc substrate for utilization in a magnetic memory storage device. The glass ceramic material exhibits a crystal phase assemblage comprised predominately of a mixture of lithium disilicate and tridymite which are uniformly interspersed with a residual glass phase and form an interlocked microstructure with the glass. The composition consists essentially, expressed in terms of weight percent on the oxide basis, of 75-95% SiO.sub.2, 3-15% Li.sub.2 O, 0-6% Al.sub.2 O.sub.3, and 0-6% K.sub.2 O. The nucleating agent for this glass-ceramic is selected from the group consisting of 0-0.1% Pd and 0-5% P.sub.2 O.sub.5 ; however if Pd is absent the P.sub.2 O.sub.5 amount is at least 0.5% and if P.sub.2 O.sub.5 is absent then the Pd amount is at least 0.005%. Additionally, up to 15% of optional ingredients may be added, including, B.sub.2 O.sub.3, Na.sub.2 O, ZnO, MgO, CaO, SrO, ZrO.sub.2, TiO.sub.2, F, Sb.sub.2 O.sub.3, As.sub.2 O.sub.3, PbO and BaO.

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