초록

A clay composition comprises, in parts by weight on oxide basis, 10-15% Al 2 O 3 , 50-85% SiO 2 , 0-12.5% B 2 O 3 and 10-20% metal oxides of the form RO or R 2 O.

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1. A composite structure comprising a ceramic object and a glass object fused together, the ceramic object consisting essentially of, in parts by weight on oxide basis: 2 O 3 2 2 O 3 and 10-20% metal oxides of the form RO or R 2 O. 2. A composite structure according to claim 1, wherein said

1. A composite structure comprising a ceramic object and a glass object fused together, the ceramic object consisting essentially of, in parts by weight on oxide basis: 2 O 3 2 2 O 3 and 10-20% metal oxides of the form RO or R 2 O. 2. A composite structure according to claim 1, wherein said metal oxides include BaO, CaO, PbO, Li 2 O, MgO, K 2 O, Na 2 O, ZnO, SrO; or MnO. 3. A composite structure according to claim 2, wherein the ceramic object includes up to 4.5% BaO, up to 8.25% CaO, up to 8% PbO, up to 8.5% Li 2 O, up to 2.5% MgO, up to 8% K 2 o, up to 8.5% Na 2 O, up to 1.5% ZnO, up to 3.5% SrO and up to 2.5% MnO, by weight on oxide basis. 4. A composite structure according to claim 1, wherein the ceramic object comprises up to 1.5% TiO 2 , up to 1.5% Fe 2 O 3 and up to 1.5% P 2 O 5 . 5. A composite structure according to claim 1, wherein the ceramic object comprises 50-70% SiO 2 and 7-12.5% B 2 O 3 . 6. A composite structure according to claim 1, wherein the ceramic object comprises 60-85% SiO 2 and 0-8% B 2 O 3 . 7. A composite structure according to claim 1, wherein the ceramic object comprises about 13 parts by weight Al 2 O 3 , from about 57 to about 60 parts by weight SiO 2 , at least about 9 parts by weight B 2 O 3 , and from about 10 to about 14 parts by weight alkali metal oxides. 8. A composite structure according to claim 1, wherein the ceramic object comprises about 13 parts by weight Al 2 O 3 , from about 57 to about 60 parts by weight SiO 2 , at least about 9 parts by weight B 2 O 3 , from about 10 to about 14 parts by weight alkali metal oxides, and from about 1 to about 6 parts by weight CaO. 9. A composite structure according to claim 1, wherein the ceramic object comprises at least about 12 parts by weight Al 2 O 3 , from about 65 to about 75 parts by weight SiO 2 , from about 1 to about 5 parts by weight B 2 O 3 , and from about 7 to about 10 parts by weight alkali metal oxides. 10. A composite structure according to claim 1, wherein the ceramic object comprises at least about 12 parts by weight Al 2 O 3 , from about 65 to about 75 parts by weight SiO 2 , from about 1 to about 5 parts by weight B 2 O 3 , from about 7 to about 10 parts by weight alkali metal oxides, and less than about 0.9 parts by weight CaO.