69results about How to "Increase the surface compressive stress" patented technology

A glass composition capable of being chemically strengthened by ion-exchange within 100 hours to provide a glass with a surface compressive stress of greater then 400 MPa and an ion-exchange depth greater then 200 microns comprising: SiO2 58% to 70% (by weight), Al2O3 5% to 15%, Na2O 12% to 18%, K2O 0.1% to 5%, MgO 4% to 10%, CaO 0% to 1% with the provisos that the total of the Al2O3 and MgO is in excess of 13%, the total of the amounts of Al2O3 plus MgO divided by the amount of K2O is at least 3 and that the sum of the amounts of Na2O, K2O and MgO is at least 22%.

A method of making a glass sheet (10) comprises laminating a high CTE core glass (11) to a low CTE clad glass (12) at high temperatures and allowing the laminate (10) to cool creating compressive stress in the clad glass (12), and then ion exchanging the laminate (10) to increase the compressive stress in the outer near surface regions of the clad glass (12). The core glass (11) may include ions that exchange with ion in the clad glass (12) to increase the compressive stress in inner surface regions of the clad glass (12) adjacent to the clad glass/core glass interfaces. The glass laminate (10) may be formed and laminated using a fusion forming and laminating process and fusion formable and ion exchangeable glass compositions.

[Subject]

An object of the present invention is to provide a method for manufacturing a chemically strengthened glass plate having a high surface compressive stress with high efficiency using a soda-lime glass, the composition of which is not particularly suited for chemical strengthening.

[Solution]

The present invention provides a method of manufacturing a chemically strengthened glass plate by ion-exchanging a glass base plate to replace alkali metal ions A that are the main alkali metal ion component of the glass base plate with alkali metal ions B having a larger ionic radius than the alkali metal ions A at a surface of the glass base plate,

• • the unexchanged glass base plate made of a soda-lime glass,
  • the method including:
  • a first step of contacting the glass base plate with a first salt containing the alkali metal ions A, the first salt containing the alkali metal ions A at a ratio X, as expressed as a molar percentage of total alkali metal ions, of 90 to 100 mol %;
  • a second step of contacting the glass plate with a second salt containing the alkali metal ions B after the first step, the second salt containing the alkali metal ions A at a ratio Y, as expressed as a molar percentage of the total alkali metal ions, of 0 to 10 mol %; and
  • a third step of contacting the glass plate with a third salt containing the alkali metal ions B after the second step, the third salt containing the alkali metal ions B at a ratio Z, as expressed as a molar percentage of the total alkali metal ions, of 98 to 100 mol %.

The invention belongs to the technical field of glass materials, and particularly relates to a two-step-method chemically strengthened alkali aluminosilicate glass composition and a preparation methodthereof. The two-step-method chemically strengthened alkali aluminosilicate glass composition comprises the following components in percentages by mole: 53-65% of SiO2, 16-22% of Al2O3, 0.01-0.5% ofB2O3, 4-8% of Li2O, 8-14% of Na2O, 0.01-1% of K2O, 0.01-3% of MgO, 0-1% of ZnO, 0-4% of P2O5 and 0-0.1% of SnO2. The formula of glass is optimized and lithium and phosphorus are added in the glass toobtain the composition, the composition is chemically strengthened by a two-step method, thus, glass has high surface pressure stress and a deep ion exchange layer, and the surface hardness, scratch resistance and falling resistance of the glass are improved.

To provide a glass plate to be tempered, which has a low thermal expansion coefficient at relatively low temperature, and which can have a sufficiently high surface compression stress by a conventional heat tempering process, even when it is thin. A glass plate to be tempered, which contains B₂O₃ in a range of from 12.5 to 35 mol % in its composition, the difference [X−Y] between the total content X of compounds selected from MgO, CaO, BaO, Na₂O and K₂O in the composition and the content Y of B₂O₃ in the composition being within a range of from −5 to 10 mol %, and which is to be tempered by heating and quenching.

The invention provides a fused salt for chemically enhancing medium-aluminum and high-aluminum silicate glass. The fused salt comprises the following compositions: KNO3, KOH, KCl and K2CO3, wherein a mass ratio of KOH to K2CO3 in the fused salt is 0.05-0.4; a mass ratio of KCl to K2CO3 is 0.075-1.0; and a mass ratio of KNO3 to K2CO3 is 100:(1.0-4.0). The invention further provides a method for performing chemically toughened enhancement by using the fused salt for chemical enhancing of medium-aluminum and high-aluminum silicate glass. The fused salt formula disclosed by the invention indicates a formula composition range suitable for chemical enhancing of the medium-aluminum and high-aluminum glass. According to the formula, corrosion on the glass surface can be avoided, and the chemically enhanced glass has high transmittance; and meanwhile, due to the formula disclosed by the invention, the surface stress and stress layer depth of the chemically enhanced glass can be greatly improved.

The invention provides a method for manufacturing glass capable of producing glass substrates which have good performances and high strength and good protective functions even the substrates are thin. In the method of manufacturing glass, after a sodium concentration reduction process for making sodium concentration on a glass surface lower than sodium concentration in the central part of glass, a chemical reinforcement processing process is performed in which the glass is dipped in fuse salt containing potassium ions to replace part of sodion in the glass with the potassium ion.

The invention discloses a high-strength glass for a display device and a preparation method of the glass. The strength of the glass can be improved from two aspects of component design and strengthening method, wherein the components exert a significant synergistic effect; through the introduction of new components CeO2 and TiO2, and the content relationships among various components are defined,in particular (Na2O+K2O)/Al2O3 and K2O/(Na2O+Li2O) are maintained in a certain range, the amount of ion exchange and the depth of the ion exchange are improved, and through the definition of the synergistic effect among the TiO2, ZrO2 and the CeO2, the thermal stability and the performance of ion exchange of the glass are improved. Finally, through the adoption of twice ion exchange, the mechanical property of the glass is greatly improved, so that the glass provided by the invention has relatively high surface compressive stress, Vickers hardness and excellent strain point and thermal stability, has the properties of compression resistance, scrape resistance and scratch resistance, and can be widely applied to a protective cover plate of the display device.

The invention relates to a scratch-resistant and external-impact-resistant ion exchange glass and a preparation method thereof. The glass comprises the following components in percentages by mass: 54%-70% of SiO2, 10%-23% of Al2O3, 0-5% of Li2O, 5%-17% of Na2O, 0-8% of K2O, 1%-10% of MgO, 0-4% of CaO, 1%-5% of ZrO2, 0.3%-1% of SnO2 and 0.2%-1.5% of CeO2. The preparation method comprises the following steps of step 1, preparing raw materials according to the components of the glass in percentages by mass, melting and clarifying the raw materials, and then molding the raw materials into the glass; and step 2, chemically strengthening the glass to obtain the scratch-resistant and external-impact-resistant ion exchange glass. Compared with soda-lime glass, the glass has stronger impact strength and surface scratch resistance, and has better protection capability on electronic products.

Provided are: a glass for chemical strengthening, suitable for a display member and having high precision of film formation and patterning (not being prone to positional misalignment) on a glass sheet and low compaction in heat treatment at low temperature (150-300 DEG C) during manufacturing of a display member, even in the case of a glass sheet manufactured by a fusion method or the like in which the cooling rate during glass forming is high; and a chemically strengthened glass obtained using the glass for chemical strengthening. A glass for chemical strengthening, obtained by melting and cooling a glass raw material, the glass for chemical strengthening containing, in percent by mass in terms of oxide, 61-75% SiO2, 2.5-10% Al2O3, 6-12% MgO, 0.1-8% CaO, 14-19% Na2O, and 0-1.8% K2O.

A glass composition of the present invention includes, in mol %, 66 to 72% SiO₂, 1 to 4% Al₂O₃, 8 to 15% MgO, 1 to 8% CaO, 12 to 16% Na₂O, and 0 to 1% K₂O. A total content of MgO and CaO is in a range of 12 to 17%, and a molar ratio of CaO to the total content of MgO and CaO is in a range of 0.1 to 0.4. The glass composition of the present invention is suitable for production by the float process, and is suitable for chemical strengthening.

The invention provides a damaged blade repairing method for a blisk based on double laser beams. The method comprises the following steps: 110, damaged areas of target damaged blades of the to-be-repaired blisk are removed; 120, three-dimensional model data of the target damaged blades are obtained, and a repair scheme is determined; 130, the target damaged blades of the to-be-repaired blisk are subjected to unit layering one by one, and composite additive manufacturing of double-laser-beam liquid micro-forging is conducted according to the repair scheme; and 140, polishing treatment is conducted on the repaired parts of the target damaged blades of the blisk. In a molten pool state repairing layer formed through laser cladding, impact waves are applied to the molten pool state repairing layer through pulse lasers, pressure and vibration are generated in the repairing layer, gas exhausting and air hole reducing are facilitated, repairing is more uniform, internal stress of the repairing area is removed, grains are refined, surface pressure stress is improved, and the repairing internal quality and mechanical and mechanical comprehensive performance are improved.

A cover plate glass strengthening method comprises the following steps: primary strengthening: cleaning the surface of cover plate glass to be strengthened, immersing the cover plate glass into ion exchange molten salt in a strengthening furnace, controlling the temperature at 350-380 DEG C, immersing the cover plate glass for 4-7 hours, and carrying out ion exchange, wherein the molten salt beinga molten liquid of more than one of potassium salt, sodium salt and lithium salt; secondary strenthening: controlling the temperature of a strengthening furnace to be 370-400 DEG C, soaking the coverplate glass into molten salt liquid of potassium salt and lithium salt with the mass fraction being 70-100:0-30, soaking is conducted for 1-3 hours, then putting the cover plate glass in a closed container to be cooled to the room temperature, so that the strengthened cover plate glass is obtained. The stress depth of the reinforced cover plate glass is 40-65 microns, the surface stress strengthis 800-1300 MPa, the warping degree is lower than 0.1 mm, and the boundary dimension expansion rate is lower than 2%.

The invention discloses an alkaline aluminosilicate protective glass capable of realizing ion exchange and a preparation method thereof. The alkaline aluminosilicate protective glass capable of realizing ion exchange comprises the following components in percentage by mass: no less than 59.2% and no more than 63.9% of SiO2, no less than 15% and no more than 19.51% of Al2O3, no less than 1% and no more than 5.7% of B2O3, no less than 11.54% and no more than 13.36% of Na2O, no less than 0% and no more than 5% of K2O, no less than 1.35% and no more than 3% of MgO, no less than 0 and no more than 0.42% of CaO and no less than 0.1% and no more than 0.4% of SnO2. The glass disclosed by the invention has a high surface compressive stress and a deep ion exchange layer, the surface compressive stress reaches 850 MPa or above, and the ion exchange layer depth reaches 57 mu m or above; and the glass is scratch-resistant, thereby meeting the service performance requirement of the product.

The invention is characterized in that: 1. The inner ring and the outer ring of the rocker bearing is heated in an heating furnace under 815-830 degree C for 2-5 hours, at same time carbon potential 0.9-1.2 is charged into the heating furnace and the volume ratio to nitrogen potential is 3-6%; 2. The inner ring and the outer ring of the rocker bearing after heat treatment are coarsely ground and sprayed by ceramic pills whose diameter is 2-5mm in 40-100m/s speed for 15-30 minutes. Advantages: ideal residual autenite content, high surface pressure and long service life.