Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1997-01-02
1999-04-20
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
501 32, 501 63, 501 69, 501 72, C03C 1012
Patent
active
058957677
ABSTRACT:
A crystallized glass and a manufacturing method therefor are disclosed. The crystallized glass comprises .beta.-spodumene solid solution as the predominant crystal phase, and is produced by forming a melted raw glass, cooling and thereafter heat-treating it. The raw glass has a composition comprising, expressed in terms of weight percent: 52-65% SiO.sub.2 ; 8-15% Al.sub.2 O.sub.3 ; 0-4% P.sub.2 O.sub.5, 3-8% TiO.sub.2, and 0-4% ZrO.sub.2, wherein the following inequality is satisfied,
0.1<(% of P.sub.2 O.sub.5 +% of ZrO.sub.2)/(% of TiO.sub.2)<0.8; 0-10% ZnO, 0-10% MgO, and 0-5% BaO, wherein the following inequality is satisfied,
<(% of ZnO+% of MgO+% of BaO)<15; 3-12% Li.sub.2 O; 0-4% K.sub.2 O; and As.sub.2 O.sub.3 and Sb.sub.2 O.sub.3, wherein the following inequality is satisfied,
0<% of As.sub.2 O.sub.3 +% of Sb.sub.2 O.sub.3 <2.
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Goto Naoyuki
Yamaguchi Katsuhiko
Bell Mark L.
Kabushiki Kaisha Ohara
Troilo Louis M.
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