72results about How to "Excellent devitrification resistance" patented technology

An optical class comprising, by mass %, 12 to 30% of total of B₂O₃ and SiO₂, 55 to 80% of total of La₂O₃, Gd₂O₃, Y₂O₃, ZrO₂, Nb₂O₅ and WO₃, 2 to 10% of ZrO₂, 0 to 15% of Nb₂O₅, 0 to 15% of ZnO and 0% or more but less than 13% of Ta₂O₅, wherein the ratio of the content of Ta₂O₅ to the total content of La₂O₃, Gd₂O₃, Y₂O₃, Yb₂O₃, ZrO₂, Nb₂O₅ and WO₃ is 0.23 or less, the ratio of the total content of La₂O₃, Gd₂O₃, Y₂O₃ and Yb₂O₃ to the total content of B₂O₃ and SiO₂ is from 2 to 4, the optical glass having a refractive index nd of 1.86 or more and an Abbe's number νd of 38 or more, and a rod shaped glass shaped material and an optical element formed of the above optical glass each.

The invention provides glass. The components of the glass comprise, in percent by weight: 55-75% of P2O5, 2-15% of Al2O3, 5-20% of CuO, 1-25% of Rn2O, 0-25% of RO, and 0.02-3% of V2O5, wherein Li2O/Rn2O is 0.3-1.0, the Rn2O is a total content of Li2O, Na2O and K2O, and the RO is a total content of MgO, CaO, SrO and BaO. By a reasonable component design, the obtained glass has excellent devitrification resistance in the case of having a high Cu content. At the same time, the glass is suitable for chemical strengthening, and a glass product obtained after chemical strengthening has excellent bending strength.

The invention discloses an additive type phosphorus phenanthrene oxa-flame retardant and a preparation method thereof. The chemical name of the additive type phosphorus phenanthrene oxa-flame retardant is poly-(10-taconic acid gylcol ester-9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide). The preparation method comprises the following steps of: firstly carrying out a reaction on DOPO, itaconic acid and ethylene glycol to generate a monomer midbody 10-taconic acid gylcol ester-9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide; and polymerizing the reacting midbody at high temperature under the function of catalyst to obtain a target product. The additive type phosphorus phenanthrene oxa-flame retardant provided by the invention is applicable to various high molecular materials with higher processing temperature such as linear polyester, fiber, polyamide, polyurethane and the like; and the preparation method is free from halogen, environment-friendly, simple in operation process, easy to control, high in yield, good in product repeatability, and less in impurity, wherein the product yield can be 98.5%-99.9%, and the production cost can be reduced.

Devised are a glass and glass substrate, which contain an alkaline component at a low content, are low in density and thermal expansion coefficient, are high in strain point and Young's modulus, and are excellent in devitrification resistance, meltability, formability, and the like. That is, the glass of the present invention includes as a glass composition, in terms of mass %, 58 to 70% of SiO₂, 16 to 25% of Al₂O₃, 3 to 8% of B₂O₃, 0 to 5% of MgO, 3 to 13% of CaO, 0 to 6% of SrO, 0 to 6% of BaO, 0 to 5% of ZnO, 0 to 5% of ZrO₂, 0 to 5% of TiO₂, and 0 to 5% of P₂O₅.

The invention provides an optical glass. The optical glass comprises 32-49 wt% of SiO2, 2-12 wt% of B2O3, 2-12 wt% of La2O3, 20-28 wt% of Nb2O5, 1-8 wt% of ZrO2, 0.5-7 wt% of BaO, 0.5-8 wt% of Li2O and 5-20 wt% of Na2O, wherein a ratio of SiO2/B2O3 is 9.0 or less, a ratio of SiO2/La2O3 is 4.0-12.0, a ratio of B2O3/La2O3 is 0.5-2.0, a ratio of (BaO+SiO2)/(Li2O+Na2O+B2O3) is 1.0-3.0, and a ratio ofNb2O5/SiO2 is 0.3-1.5. The optical glass obtained by the reasonable component proportioning has the advantages of negative anomalous dispersion and excellent devitrification resistance.

An alkali-free glass characterized by having a glass composition being substantially free of an alkali metal oxide, As₂O₃ and Sb₂O₃ and including, in terms of mol %, 55 to 75% of SiO₂, 7 to 15% of Al₂O₃, 7 to 12% of B₂O₃, 0 to 3% of MgO, 7 to 12% of CaO, 0 to 5% of SrO, 0 to 2% of BaO, 0 to 5% of ZnO and 0.01 to 1% of SnO₂ and has a liquidus viscosity of 10^5.2 dPa·s or higher and a temperature corresponding to a viscosity of 10^2.5 dPa·s of 1,550° C. or lower.

The present invention relates to an optical glass containing, in terms of mass % on the basis of oxides, B₂O₃: 10 to 20%, SiO₂: 0.5 to 12%, ZnO: 5 to 19%, Ta₂O₅: 2.5 to 17%, Li₂O: 0.2 to 3%, ZrO₂: 0.6 to 4.9%, WO₃: 1 to 20%, La₂O₃: 25 to 50%, Gd₂O₃: 0 to 13%, and Y₂O₃: 0.2 to 20%, provided that La₂O₃+Gd₂O₃+Y₂O₃ is 35 to 60%, in which the optical glass does not substantially contain Nb₂O₅, and has a refractive index (n_d) of 1.82 to 1.86, an Abbe's number (ν_d) of 37 to 44 and a glass transition point (T_g) of 630° C. or lower.

An optical glass having a low transition temperature, high transmissivity, and good chemical stability and devitrification resistance, the refractive index of the optical glass being 1.60-1.65, and the Abbe number thereof being 62-66; the optical glass comprises the following components by weight percentage: P2O5: 30%-50%, BaO: 35%-50%, B2O3: 2%-6%, La2O3: 0%-5%, Gd2O3: 0%-5%, Al2O3: 0.1%-5%, Li2O: 0.1%-5%, MgO: 2%-10%, and CaO: 2%-10%. The present invention utilizes P2O5 as the network former of the glass, increasing the transmissivity of the glass; in addition, a large amount of BaO is an important ingredient for improving the transmissivity of the glass, while also increasing the refractive index of the glass, and improving the weathering stability of the glass.

The invention provides high-refraction and high-dispersion optical glass. The optical glass comprises the following components in percentage by weight: 25-40% of SiO2, 20-38% of TiO2, 3-20% of Na2O, 3-20% of BaO and 5-20% of Nb2O5, wherein the ratio of SiO2/(BaO+Nb2O5) is 0.75-3.0. Through reasonable component design and proportion, the optical glass provided by the invention has a low thermal expansion coefficient and excellent devitrification resistance and meets the requirements of the photoelectric field while meeting the expected refractive index and Abbe number.

The invention provides optical glass. The optical glass contains the ingredients in percentage by weight: 10%-30% of B2O3, 0%-10% of SiO2, 20%-40% of La2O3, 1%-10% of WO3, 3%-15% of Nb2O5, 0%-8% of TiO2, 16%-35% of BaO, more than 0% but less than or equal to 10% of ZrO2 and more than 0% but less than or equal to 9.5% of ZnO, and is free of Gd2O3. Through reasonable ingredient design, the optical glass provided by the invention with expected index of refraction and Abbe number can be obtained by a relatively low cost; and the optical glass has excellent devitrification resistance.

The invention provides high-refractive-index low-chromatic-dispersion optical glass. The optical glass comprises, by weight, 20-35% of B2O3, 32-52% of La2O3, 6-20% of Y2O3, 0-15% of Gd2O3 and 1-12% ofZrO2, wherein Y2O3/(Y2O3+Gd2O3) is 0.6-1.0. The Young modulus E of the optical glass is 10000*10<7> or above. Through reasonable component design, the obtained optical glass has high refractive indexand low chromatic dispersion, and is low in production cost, excellent in devitrification resistance and high in Young modulus.

The invention provides high-refractive-index and low-dispersion optical glass. The optical glass consists of the following raw materials in percentage by weight: 5-32 percent of SiO2 and B2O3, 45-65 percent of La2O3, Gd2O3 and Y2O3, 0.5-10 percent of ZnO, 1-20 percent of TiO2 and Nb2O5, 0-15 percent of ZrO2, 0-2 percent of WO3, 0-10 percent of Li2O, Na2O and K2O, 0-10 percent of MgO, CaO, SrO and BaO, 0-12 percent of Ta2O5 and 0-1 percent of Sb2O3. Compared with the prior art, the high-refractive-index and low-dispersion optical glass has the beneficial effects of higher internal color penetration degree, small specific weight, low smelting process temperature, smaller adding amounts of Ta2O5 and Gd2O3 and lowered cost.

The invention provides chemical reinforced glass for an electronic device and a preparation method thereof. An ideal compression stress layer depth is obtained at relatively low reinforcing temperature and relatively short reinforcing time. The method comprises the following steps: 1) taking raw materials: greater than or equal to 50 percent and less than or equal to 70 percent of SiO2, greater than or equal to 0 percent and less than or equal to 2 percent of B2O3, greater than or equal to 12 percent and less than or equal to 25 percent of Al2O3, greater than or equal to 11 percent and less than or equal to 15 percent of Na2O, greater than or equal to 0 percent and less than or equal to 5 percent of ZnO, greater than or equal to 2 percent and less than or equal to 5 percent of Li2O, greater than or equal to 0 percent and less than or equal to 5 percent of MgO, greater than or equal to 0 percent and less than or equal to 1 percent of ZrO2, greater than or equal to 1 percent and less than or equal to 4 percent of SnO2 and greater than or equal to 0.67 and less than or equal to 0.97 of (Na2O+Li2O)/(Al2O3+ZrO2+MgO); 2) melting and clarifying and carrying out ion change. The surface compressive stress of the reinforced glass is 882.4MPa to 990.5MPa, the surface stress layer depth is 80.5mu m to 96.3mu m, the Vickers hardness is 658kg/mm<2> to 690kg/mm<2> and the strain point temperature is 550.5 DEG C to 572.2 DEG C.

A glass composition SiO₂, Al₂O₃, B₂O₃, and RO, where RO represents one kind or two or more kinds selected from MgO, CaO, SrO, and BaO, and allows two or more kinds of crystals selected from a SiO₂—Al₂O₃—RO-based crystal, a SiO₂-based crystal, and a SiO₂—Al₂O₃-based crystal to precipitate in a temperature range of from a liquidus line temperature to (the liquidus line temperature—50° C.)

An aspect of the present invention relates to optical glass, wherein, in a glass composition based on oxides, a content of P₂O₅ is in the range of 20˜34 weight %; a content of B₂O₃ is over 0 weight % but 10 weight % or less; a weight ratio (B₂O₃/P₂O₅) is over 0 but less than 0.39; a weight ratio [TiO₂/(TiO₂+Nb₂O₅+WO₃+Bi₂O₃+Ta₂O₅)] is in the range of 0.059˜0.180; and a weight ratio [(P₂O₅+B₂O₃+SiO₂)/(Na₂O+K₂O+Li₂O)] is in the range of 1.39˜1.80, the optical glass having a refractive index nd of 1.78˜1.83, and an Abbe's number vd of 20˜25.