The present invention aims to provide a chemically strengthened glass with cutting easiness and a higher compressive residual stress than the conventional one, made of soda-lime glass. The chemically strengthened glass of the present invention is a chemically strengthened glass manufactured by ion exchange of a surface layer of a glass article to replace alkali metal ions A which are the largest in amount among all the alkali metal ion components of the glass article with alkali metal ions B having a larger ionic radius than the alkali metal ions A, wherein the glass article before the ion exchange is made of soda-lime glass substantially composed of SiO2: 65 to 75%, Na2O+K2O: 5 to 20%, CaO: 2 to 15%, MgO: 0 to 10%, and Al2O3: 0 to 5% on a mass basis, the chemically strengthened glass after the ion exchange has a surface compressive stress of 600 to 900 MPa, and has a compressive stress layer with a depth of 5 to 20 µm at a surface of the glass.

Chemically strengthened glass and method for producing same

A cathode ray tube comprising an electron source and an electron beam guidance cavity (220) having an input aperture (208) and an output aperture (223), wherein at least a part of the wall of the electron beam guidance cavity near the output aperture comprises an isolating material having a secondary emission coefficient δ1 for cooperation with the cathode (205) and for forming an electron source. Furthermore, the cathode ray tube comprises a first electrode (226) which is connectable to a first voltage source for applying, in operation, an electric field with a first field strength E1 between the cathode and the output aperture. δ1 and E1 have values, which allow electron transport through the electron beam guidance cavity. According to the invention, the cathode structure comprises means for reducing the spread of the energy distribution of the electrons leaving the exit aperture between the input of the cavity and the accelerating grid.

Cathode-ray tube

The present invention aims to provide a chemically strengthened glass plate which has a good yield in a cutting process of the chemically strengthened glass plate and has sufficient strength. The chemically strengthened glass plate has a surface compressive stress of not less than 600 MPa at a surface of the chemically strengthened glass plate, and a compressive stress layer containing two types of stress patterns A and B. The stress pattern A is a stress pattern of a surface portion of the glass plate, and the stress pattern B is a stress pattern of an inside of the glass plate. The stress patterns satisfy the formula SA>SB where SA represents a slope of the stress pattern A and SB represents a slope of the stress pattern B when the stress patterns A and B are each approximated by a linear function.

Chemically strengthened glass plate and method for manufacturing same

The present invention relates to a process for producing a chemically strengthened glass substrate for a display device, the process including a pre-heating step of pre-heating a glass to a pre-heating temperature and subsequently an ion exchange step of immersing the glass in a chemical strengthening liquid, in which the pre-heating temperature in the pre-heating step and a strain point of the glass satisfy: 220° C.≦(strain point−pre-heating temperature).

Process for producing chemically strengthened glass substrate for display device

Provided are: a glass to be chemically reinforced, which enables the production of a glass having high strength and excellent solarisation resistance; and a housing produced using the glass. A glass to be chemically reinforced contains at least 55-80% of SiO2, 5-20% of Na2O, 0.001-3% of Fe2O3 and 0.001-3% of TiO2 and additionally contains 0.001-10% of MpOq (wherein M represents at least one element selected from Co, Cu, V, Cr, Pr, Ce, Bi, Eu, Mn, Er, Ni, Nd, W, Rb, Sn and Ag; and p and q respectively represent atomic proportions of M and O), wherein % is mol% in terms of oxide contents. A glass housing comprises a chemically reinforced glass produced by subjecting the glass to be chemically reinforced to a chemical reinforcement treatment.

Glass to be chemically reinforced and glass housing

PURPOSE:To obtain the titled panel having excellent strength and surface smoothness without occurrence of browning by irradiation with electron rays and using an exclusive oven, by dipping a glass panel of a specific composition in a molten salt containing K ions while controlling time. CONSTITUTION:A glass raw plate having a composition of 69-73wt.% SiO2, 0.5-1.5wt.% Al2O3, 0-0.15wt.% Fe2O3, 7-14wt.% CaO, 0-4.5wt.% MgO, 12-16wt.% Na2O, 0-1.5wt.% K2O, 0-0.1wt.% TiO2, 0-0.5wt.% SO3 and 0.2-1.5wt.% Li2O is formed to provide a glass panel, which is then dipped in a molten salt (e.g. molten salt of KNO3) containing K ions at 430-490 deg.C to substitute Na ions with K ions while controlling dipping time so as to afford a glass composition of 0.2-1.5wt.% Li2O and 0.2-0.6 weight ratio [Na2O/(Na2O +K2O)] is >=0.5mu depth from the surface thereof.

Glass panel irradiated with electron rays and production thereof

PURPOSE:To obtain a glass article resistant to discoloration with radiation of electron ray, by contacting soda-lime silica glass with a molten salt containing Ca , Ba or Sr and K . CONSTITUTION:A soda-lime silica glass is made to contact with a molten salt containing potassium ion and at least one kind of ions selected from a calcium ion, barium ion and strontium ion to substitute a part of sodium ion in the surface layer of the glass with potassium ion. The surface layer extending from the surface to the intrusion depth of the radiated electron ray has a Na2O /(Na2O+K2O) molar ratio of 0.4-0.65. The molten salt used in the above process preferably contains 99.85-99.90mol.% of salt containing potassium ion. Preferably, the molten salt is maintained at 440-480 deg.C and is made to contact with the glass for 0.5-4hr.

Production of glass article resistant to discoloration with electron ray

PURPOSE: To prevent the coloration by electron beam, by heat-treating soda.lime.silica glass substituted K ion and Li ion for Na ion in the surface. CONSTITUTION: The soda.lime glass consisting of 50W75wt.% (hereinafter %) SiO 2 , 0.5W2.5% Al 2 O 3 , 0W4.5% MgO, 5.0W14.0% CaO, 5.0W16.0% Na 2 O, 0W2.0% K 2 O, 0W1.0% Fe 2 O 3 , 0W0.5% TiO 2 and 0W0.5% SO 3 is immersed in a molten salt contg. K and Li ions to substitute K and Li ions for 70W100% Na ion in the most outside layer of surface of the glass and thereafter, the Na 2 O/(Na 2 O +K 2 O) molar ratio in the surface layer of the glass between the surface of the glass and near the depth to which the irradiating electron beam can be penetrated, and the molar ratio of Li 2 O to the total amt. of alkali are adjusted to 0.4W0.65 and 0.05W0.3, respectively, by diffusing Na, K and Li ions by heat- treating. COPYRIGHT: (C)1989,JPO&Japio

Production of glass article prevented to be colored by electron beam

PURPOSE:To prevent glass from being colored by irradiation of electron beams by substituting Na ion incorporated in the surface of a part wherein electron beams are applied by means of a cathode-ray tube made of soda, lime and silica-base glass with both at least of one kind selected from among the ions of K, Rb, Ce or the like and Li ion. CONSTITUTION:A glass panel for cathode-rays is made of soda, lime and silica- base glass having composition consisting of by weight% 69-73% SiO2, 0.5-1.5% Al2O3, 0-0.15% Fe2O3, 7-14% CaO, 0-4.5% MgO, 12-16% Na2O, 0-1.5% K2O, 0-0.1% TiO2 and 0-0.5% SO3 and immersed into a molten salt bath contg. both at least of one kind selected from among K ion, Rb ion, Ce ion and 0.04-0.4mol. Li ion therefor at 430-490 deg.C for 0.5-4hr and thereby Na ion incorporated in the surface of the panel is substituted with both at least one kind of respective ions of K, Rb, Ce and Li ion. Glass which contains 0.1-3% Li2O on the average to a range within 10mum depth from the surface of glass and is not colored by irradiation of electron beams is obtained.

Glass panel applied with electron beam and its production

PURPOSE:To form ruggedness having weatherability on a glass substrate with good dimensional accuracy by heating a glass plate coated with a specific coating liquid to a prescribed temp. and irradiating this coating layer with a laser beam, then treating the layer with a hydrofluoric acid liquid. CONSTITUTION:The coating liquid contg. at least either of the fine particles of the oxide of a metal which can be dispersed into liquid and the alkoxide of the metal is applied on the surface of the glass plate. This glass plate is then heated to the temp. lower than the strain point and lower by 100 deg.C than the strain point and the coating layer is irradiated with the laser beam to a prescribed shape. The glass plate is then cooled and is treated by a liquid contg. the hydrofluoric acid, by which the coating layer in the non-irradiated part is removed and the ruggedness of the prescribed shape is formed on the glass plate. The value obtd. after the energy density of the laser beam is divided by the scanning speed of the beam is preferably 50 to 300(W/mm )(m/sec) in the irradiation of the laser beam.

Suzuki Koichi

Papers

Glass panel irradiated with electron rays and production thereof

Production of glass article resistant to discoloration with electron ray

Production of glass article prevented to be colored by electron beam

Glass panel applied with electron beam and its production

Method for forming ruggedness on substrate surface