Glass with high proportion of zirconium-oxide and its uses

A glass fiber consisting of a glass having a high zirconium oxide content and a composition consisting of, in percent by weight based on oxide content:

• SiO2 54 to 72 Al2O3 0.5 to 7 ZrO2 10 to 20 B2O3 0 to <5 CaO 3 to 11 MgO 0 to 10 SrO 0 to 8 BaO 0 to 10 CaO + MgO + SrO + BaO >5 to 24 Na2O 2 to <8 K2O 0 to 5 Na2O + K2O 2 to <8 La2O3 0 to 5 TiO2 0 to 4
• and optionally at least one fining agent in an amount sufficient for fining;
• wherein either said TiO2 is present in amounts greater than 0.1 percent by weight or said La2O3 is present in amounts greater than 0.6 percent by weight;
• and
• wherein said glass has a hydrolytic resistance in hydrolytic class 1, an acid resistance in acid class 3 or better, a caustic lye resistance in lye class 1, a glass transition temperature (Tg) of at least 650° C., a coefficient of thermal expansion (α20/300) of 4.1×10−6 to 7.4×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (νd) of 48 to 58 and a negative anomalous partial dispersion in a blue spectral region (ΔPg,F) of up to −0.0130.

A substrate glass for display technology or photovoltaics, said substrate glass having a high zirconium oxide content and a composition consisting of, in percent by weight based on oxide content:

• SiO2 54 to 72 Al2O3 0.5 to 7 ZrO2 10 to 20 B2O3 0 to <5 CaO 3 to 11 MgO 0 to 10 SrO 0 to 8 BaO 0 to 10 CaO + MgO + SrO + BaO >5 to 24 Na2O 2 to <8 K2O 0 to 5 Na2O + K2O 2 to <8 La2O3 0 to 5 TiO2 0 to 4
• and optionally at least one fining agent in an amount sufficient for fining;
• wherein either said TiO2 is present in amounts greater than 0.1 percent by weight or said La2O3 is present in amounts greater than 0.6 percent by weight;
• and
• wherein said glass has a hydrolytic resistance in hydrolytic class 1, an acid resistance in acid class 3 or better, a caustic lye resistance in lye class 1, a glass transition temperature (Tg) of at least 650° C., a coefficient of thermal expansion (α20/300) of 4.1×10−6 to 7.4×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (νd) of 48 to 58 and a negative anomalous partial dispersion in a blue spectral region (ΔPg,F) of up to −0.0130.

An optical glass having a high zirconium oxide content and a composition consisting of, in percent by weight based on oxide content:

• SiO2 54 to 72 Al2O3 0.5 to 7 ZrO2 10 to 20 B2O3 0 to <5 CaO 3 to 11 MgO 0 to 10 SrO 0 to 8 BaO 0 to 10 CaO + MgO + SrO + BaO >5 to 24 Na2O 2 to <8 K2O 0 to 5 Na2O + K2O 2 to <8 La2O3 0 to 5 TiO2 0 to 4
• and optionally at least one fining agent
• in an amount sufficient for fining;
• wherein either said TiO2 is present in amounts greater than 0.1 percent by weight or said La2O3 is present in amounts greater than 0.6 percent by weight;
• and
• wherein said glass has a hydrolytic resistance in hydrolytic class 1, an acid resistance in acid class 3 or better, a caustic lye resistance in lye class 1, a glass transition temperature (Tg) of at least 650° C., a coefficient of thermal expansion (α20/300) of 4.1×10−6 to 7.4×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (νd) of 48 to 58 and a negative anomalous partial dispersion in a blue spectral region (ΔPg,F) of up to −0.0130.

A container glass for chemically reactive liquids, said container glass having a high zirconium oxide content and a composition consisting of, in percent by weight based on oxide content:

• SiO2 54 to 72 Al2O3 0.5 to 7 ZrO2 10 to 20 B2O3 0 to <5 CaO 3 to 11 MgO 0 to 10 SrO 0 to 8 BaO 0 to 10 CaO + MgO + SrO + BaO >5 to 24 Na2O 2 to <8 K2O 0 to 5 Na2O + K2O 2 to <8 La2O3 0 to 5 TiO2 0 to 4
• and optionally at least one fining agent in an amount sufficient for fining;
• wherein either said TiO2 is present in amounts greater than 0.1 percent by weight or said La2O3 is present in amounts greater than 0.6 percent by weight;
• and
• wherein said glass has a hydrolytic resistance in hydrolytic class 1, an acid resistance in acid class 3 or better, a caustic lye resistance in lye class 1, a glass transition temperature (Tg) of at least 650° C., a coefficient of thermal expansion (α20/300) of 4.1×10−6 to 7.4×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (νd) of 48 to 58 and a negative anomalous partial dispersion in a blue spectral region (ΔPg,F) of up to −0.0130.

A composite glass-metal article made by fusing a piece of tungsten or molybdenum to a glass, wherein said glass having a high zirconium oxide content and a composition consisting of, in percent by weight based on oxide content:

• SiO2 54 to 72 Al2O3 0.5 to 7 ZrO2 10 to 20 B2O3 0 to <5 CaO 3 to 11 MgO 0 to 10 SrO 0 to 8 BaO 0 to 10 CaO + MgO + SrO + BaO >5 to 24 Na2O 2 to <8 K2O 0 to 5 Na2O + K2O 2 to <8 La2O3 0 to 5 TiO2 0 to 4
• and optionally at least one fining agent in an amount sufficient for fining;
• wherein either said TiO2 is present in amounts greater than 0.1 percent by weight or said La2O3 is present in amounts greater than 0.6 percent by weight;
• and
• wherein said glass has a hydrolytic resistance in hydrolytic class 1, an acid resistance in acid class 3 or better, a caustic lye resistance in lye class 1, a glass transition temperature (Tg) of at least 650° C., a coefficient of thermal expansion (α20/300) of 4.1×10−6 to 7.4×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (νd) of 48 to 58 and a negative anomalous partial dispersion in a blue spectral region (ΔPg,F) of up to −0.0130.