Glass with high proportion of zirconium-oxide and its uses

A silicate 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 <18 B2O3 0 to 4 CaO 3 to 10 MgO 0 to 10 SrO 0 to 8 BaO 0 to 10 CaO + MgO + SrO + BaO >5 to 23 Na2O 3 to <10 K2O 0 to 5 Na2O + K2O 3 to <10 La2O3 0 to 5 TiO2 0 to 4,
• and optionally at least one fining agent in an amount sufficient for fining;
• and
• 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 at least one fining agent does not include any fluoride.

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

• SiO2 58 to 71 Al2O3 0.5 to <2.3 ZrO2 >10 to <18 CaO 3 to 11 MgO 0 to 2.6 SrO 0 to 6 BaO 0 to 9 CaO + MgO + SrO + BaO >5 to 24 Na2O 2 to 9 K2O 0 to 3 Na2O + K2O 2 to <10 La2O3 0.6 to 1,
• and optionally at least one fining agent in an amount sufficient for fining;
• and
• wherein said at least one fining agent does not include any fluoride.

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 <18 B2O3 0 to <5 CaO 3 to 11 MgO 0 to 10 SrO 0 to 8 BaO 0 to 12 CaO + MgO + SrO + BaO >5 to 24 Na2O 2 to <10 K2O 0 to 5 Na2O + K2O 2 to <10 La2O3 0 to 6 TiO2 0 to 4 Fe2O3 <0.005,
• and optionally at least one fining agent in an amount sufficient for fining;
• and
• 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, said at least one fining agent does not include any fluoride and said optical 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 640° C., a coefficient of thermal expansion (α20/300) of 4.1×10−6 to 8.0×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (νd) of 47 to 66 and a negative anomalous partial dispersion in a blue spectral region (ΔPg,F) of up to −0.0130.

A substrate glass for electronic data processing devices, wherein said substrate glass is made by a process comprising chemically tempering a silicate glass by ion exchange, said silicate 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 <18 B2O3 0 to <5 CaO 3 to 11 MgO 0 to 10 SrO 0 to 8 BaO 0 to 12 CaO + MgO + SrO + BaO >5 to 24 Na2O 2 to <10 K2O 0 to 5 Na2O + K2O 2 to <10 La2O3 0 to 6 TiO2 0 to 4,
• and optionally at least one fining agent in an amount sufficient for fining;
• and
• 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, said at least one fining agent does not include any fluoride and said silicate 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 640° C., a coefficient of thermal expansion (α20/300) of 4.1×10−6 to 8.0×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (νd) of 47 to 66 and a negative anomalous partial dispersion in a blue spectral region (ΔPg,F) of up to −0.0130.

A glass fiber for reinforcing concrete, said glass fiber being made by a method comprising converting silicate glass, said silicate 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 <18 B2O3 0 to <5 CaO 3 to 11 MgO 0 to 10 SrO 0 to 8 BaO 0 to 12 CaO + MgO + SrO + BaO >5 to 24 Na2O 2 to <10 K2O 0 to 5 Na2O + K2O 2 to <10 La2O3 0 to 6 TiO2 0 to 4,
• and optionally at least one fining agent in an amount sufficient for fining;
• and
• 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, said at least one fining agent does not include any fluoride and said silicate 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 640° C. an a coefficient of thermal expansion (α20/300) of 4.1×10−6 to 8.0×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (νd) of 47 to 66 and a negative anomalous partial dispersion in a blue spectral region (ΔPg,F) of up to −0.0130.

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

• SiO2 58 to 71 Al2O3 0.5 to <2.3 ZrO2 >10 to <18 CaO 3 to 11 MgO 0 to 2.6 SrO 0 to 6 BaO 0 to 9 CaO + MgO + SrO + BaO >5 to 24 Na2O 2 to 9 K2O 0 to 3 Na2O + K2O 2 to <10 La2O3 0.6 to 1,
• and optionally at least one fining agent in an amount sufficient for fining;
• and
• wherein said at least one fining agent does not include any fluoride and said chemically resistant glass has a hydrolytic resistance in hydrolytic class 1, an acid resistance in acid class 1, a caustic lye resistance in lye class 1, a glass transition temperature (Tg) of at least 640° C. an a coefficient of thermal expansion (α20/300) of 4.1×10−6 to 8.0×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (νd) of 47 to 66 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 silicate glass, wherein said silicate 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 <12 B2O3 0 to <5 CaO 3 to 11 MgO 0 to 10 SrO 0 to 8 BaO 0 to 12 CaO + MgO + SrO + BaO >5 to 24 Na2O 2 to <10 K2O 0 to 5 Na2O + K2O 2 to <10 La2O3 0 to 6 TiO2 0 to 4,
• and optionally at least one fining agent in an amount sufficient for fining;
• and
• wherein either said TiO2 is present in amounts greater than 0.1 percent by weight or said La2O3 is present in amounts greater than 0.1 percent by weight, said at least one fining agent does not include any fluoride and said silicate 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 640° C. an a coefficient of thermal expansion (α20/300) of 4.1×10−6 to 8.0×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (νd) of 47 to 66 and a negative anomalous partial dispersion in a blue spectral region (ΔPg,F) of up to −0.0130.