70results about How to "Increase the surface compressive stress" patented technology

The present invention provides a strengthened glass that does not exhibit frangible behavior when subjected to impact or contact forces, and a method of strengthening a glass. The glass may be strengthened by subjecting it to multiple, successive, ion exchange treatments. The multiple ion exchange treatments provide a local compressive stress maximum at a depth of the strengthened layer and a second local maximum at or near the surface of the glass.

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.

A method for producing hurricane-resistant glass, mainly includes the steps of: cutting and abrading the edges of a glass; feeding the glass into a tempering furnace and heating the glass to a critical state of the softening point; feeding the glass heated to a critical state of the softening point at a speed of 25-50 cm / s into a cooling chamber, to allow the glass to develop a surface compressive stress of not less than 150 MPa; etching the cooled glass with an etching solution; and rinsing surfaces of the glass. The invention further relates to the hurricane-resistant glass produced thereby and glass assemblies containing the said hurricane-resistant glass.

The invention relates to the field of tempered glass preparation, in particular relates to a method for preparing special high-strength tempered glass for a high-speed train, and provides a method for preparing special high-strength tempered glass for a high-speed train aiming at the defects of the prior art. The method is characterized in that high-strength single glass is prepared by using a method that a thermal tempering technique is taken as a main method and a chemical tempering technique is taken as an auxiliary method, and furthermore a glass conductive heating film and an anti-splashing film are added by using an interlay technique and a precision forming technique, so as to finally produce multi-layer high-speed train windproof glass with high strength and demisting and defrosting effectiveness. The high-speed train windproof glass prepared by using the method has the characteristics of high strength, good light translucency, uniform electrical heating and the like.

The present invention provides a cover glass for a display, having high durability to slow cracking and strong abraded strength even though a compressive stress is large and a depth of a compressive stress layer is deep. The present invention relates to a cover glass for a display, in which a depth of a compressive stress layer (DOL) is 30 μm or more, a surface compressive stress is 300 MPa or more, a position (HW) at which a compressive stress is half of a value of the surface compressive stress is a position of 8 μm or more from a glass surface, and the depth of the compressive stress layer (DOL) and the position (HW) at which the compressive stress is half of the value of the surface compressive stress satisfy the following formula:0.05≦HW / DOL≦0.23  (1).

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 %.

Provided is a glass plate for tempering, which is characterized by having a small thermal expansion coefficient under a relatively low temperature, even when the plate is thin, while obtaining a sufficiently high surface compression by the steps involved in conventional thermal tempering. A glass plate for tempering is characterized by having a composition comprising 12.5 to 35 mol% of B2O3; having a composition wherein the difference [X-Y] between the total content X of compound selected from the group consisting of MgO, CaO, BaO, Na2O, and K2O and the total content Y of B2O3 is within a range of -5 to 10 mol%; and being subjected to tempering by heating and quenching.

The invention relates to a process of preparing anti-hurricane glass, comprising following steps: cutting and edging glass; heating glass in the tempering furnace to softening point; feeding the glass into cooling room at speed of 25-50 cm / s, the air pressure in cooling room should be controlled at 6.5-7.5 * 103 Pa to make the surface compressive stress reach to more than 150 MPa; putting glass into acid-etching slot for suitable acid etching; washing glass surface with clean water; coating the surface with organic silicon protecting membrane. The invention is characterized by low production cost and short producing time.

A glass includes, as represented by mole percentage based on oxides, from 60% to 68% of SiO2, from 8 to 12% of Al2O3, from 12 to 20% of Na2O, from 0.1 to 6% of K2O, from 6.4 to 12.5% of MgO, and from 0.001 to 4% of ZrO2. In the glass, a total content of B2O3, P2O5, CaO, SrO, and BaO is from 0% to 1%. The glass satisfies 2×Al2O3 / SiO2≦0.4 and 0<K2O / Na2O≦0.3.

The invention discloses a manufacturing method of a high-strength LED (light-emitting diode) glass bulb. The manufacturing method comprises the following steps: (1) preheating the LED glass bulb which is washed cleanly to the temperature of 350 DEG C, and performing heat preservation for 0.5h; (2) preparing mixed molten salt, heating to the temperature of 400-480 DEG C, performing the heat preservation for 1-3h, then immersing the LED glass bulb into the mixed molten salt with the temperature of 400-480 DEG C, soaking for heat preservation for 5-8h; and (3) after soaking, taking the LED glass bulb out of the mixed molten salt, annealing to room temperature, and washing to finally obtain the high-strength LED glass bulb, wherein the mixed molten salt is formed by mixing a potassium nitrate molten salt serving as a main raw material with additives including potassium hydroxide, potassium fluoride, aluminum oxide and diatomite. According to the manufacturing method disclosed by the invention, by adopting the mixed molten salt based on optimized proportion, the speed and the depth of ion exchange are improved, the surface compression stress of glass is increased, and the strength, the impact resistance and the thermal stability of the LED glass bulb are further improved.

The present invention relates to a chemically strengthened glass satisfying A1 [MPa] of 600 or more, A2 [MPa] of 50 or more, B1 [μm] of 6 or less, B2 [μm] of 10% or more of t [μm], C [MPa] of −30 or less, and A1 / B1 [MPa / μm] of 100 or more when the chemically strengthened glass has a thickness t [μm] and a profile of a stress value [MPa] at a depth x [μm] from a glass surface is approximated by an error least-squares method in a region of 0<x<3t / 8 using the following function while defining a compressive stress as positive and a tensile stress as negative: A1erfc(x / B1)+A2erfc(x / B2)+C, in which erfc is a complementary error function, and relations of A1>A2 and B1<B2 are satisfied.