609 results about "Sialon" patented technology

Methods and apparatus are provided for igniting, modulating, and sustaining a plasma for various coating processes. In one embodiment, the surface of an object can be coated by forming a plasma in a cavity by subjecting a gas to an amount of electromagnetic radiation power in the presence of a plasma catalyst and adding at least one coating material to the plasma. The material is allowed to deposit on the surface of the object to form a coating. Various plasma catalysts are also provided. Coatings can include any material, for example, carbon nanotubes, BaTiO₃, Cr₂O₃, hafnium oxide, 3Al₂O₃.2SiO₂, Al₂O₃, SiAlON, MgAl₂O₄, TiN, and TiO₂.

The present invention relates to dry refractory compositions having excellent thermal insulation values. The dry refractory composition also has excellent resistance to molten metal and slag. The composition comprises a lightweight filler material selected from the group consisting of perlite, vermiculite, expanded shale, expanded fire clay, expanded silica-alumina hollow spheres, vesicular alumina, sintered porous alumina, alumina spinel Stone insulating aggregate, ettringite insulating aggregate, expanded mullite, cordierite and anorthite, and a matrix material selected from the group consisting of calcined alumina, fused alumina, sintered magnesia, fused magnesia, Silicon fume, fused silica, corundum, boron carbide, titanium diboride, zirconium boride, boron nitride, aluminum nitride, silicon nitride, sialonite, titanium dioxide, barium sulfate, zircon, sillimanite Group of minerals, pyrophyllite, fire clay, carbon and calcium fluoride. The composition may also contain dense refractory aggregates selected from the group consisting of calcined clay, calcined clinker, minerals of the sillimanite group, calcined bauxite, pyrophyllite, silica, zircon, baddeleyite, cordierite , corundum, sintered alumina, fused alumina, fused quartz, sintered mullite, fused mullite, fused zirconia, sintered zirconia mullite, fused zirconia mullite, sintered magnesia, Fused magnesia, sintered spinel and fused spinel refractory clinker. The composition also contains a heat activated binder and a dust suppressant.

A phosphor which is excited by a blue light and emits a yellow light has been conventionally known as a SiAlON phosphor wherein a rare earth element such as Eu ion is activated. The present invention provides an oxynitride phosphor having emission characteristics of more various wavelengths and a light-emitting device using such an oxynitride phosphor. The oxynitride phosphor mainly contains a crystalline phase of the general formula: La₃Si₈N₁₁O₄ or a crystalline phase of the general formula: La₃Si_8−xAl_xN_11−xO_4+x (0<x≦4), and an optically active element (M) composed of one or more elements selected from Mn, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu is added thereto as a luminescent center component.

Offered is a fluorescent substance consisting of Eu-activated β-sialon and capable of enhancing the brightness of a light emitting device such as a white LED using blue or ultraviolet light as a light source. The fluorescent substance has as its main constituent a β-sialon represented by the general formula Si_6-zAl_zO_zN_8-z and containing Eu, wherein the spin density is 2.0×10¹⁷/g or less as measured by electron spin resonance spectroscopy corresponding to an absorption of g=2.00±0.02 at 25° C. In the above fluorescent substance, it is preferable that lattice constant a of the β-sialon be 0.7608-0.7620 nm, the lattice constant c be 0.2908-0.2920 nm, and the Eu content be 0.1-3 mass %.

The present invention aims at providing a chemically stabilized inorganic phosphor which emits orange light or red light at wavelengths longer than the conventional rare-earth activated sialon phosphor and which has a higher luminance.

The solving means resides in an inorganic phosphor design represented by a composition formula M_aA_bD_cE_dN_eO_fX_g and containing: an M element (M is one kind or two or more kinds of element(s) selected from Mn, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu); a divalent A element (A is one kind or two or more kinds of element(s) selected from Mg, Ca, Sr, and Ba); a trivalent E element (E is one kind or two or more kinds of element(s) selected from B, Al, Ga, and In); a tetravalent D element (D is one kind or two or more kinds of element(s) selected from Si, Ge, and Sn); nitrogen; oxygen (including an oxygen absent condition); and another X element (including an X absent condition); wherein the parameters a, b, c, d, e, f, and g included in the equation are adjusted to and set at particular regions to provide an inorganic phosphor which emits orange light at wavelengths of 570 nm or longer or red light at wavelengths of 600 nm or longer with excellent color rendering property.

The present invention aims at providing a chemically stabilized inorganic phosphor, among oxynitride phosphors including alkaline earths, which oxynitride phosphor emits orange or red light at longer wavelengths at higher luminance than conventional sialon phosphors activated by rare earths. The present invention further aims at providing a light emitting instrument based on the phosphor, for a lighting instrument excellent in color rendering property and for an image displaying apparatus excellent in durability.

The solving means resides in provision of a fundamental phosphor comprising:

• • a composition on a pseudo-ternary phase diagram including AO (A is one kind or two or more kinds of element(s) selected from Mg, Ca, Sr, and Ba; and AO is oxide of A), Si₃N₄, and SiO₂ as end members, respectively, and satisfying all of the following conditions:
  • in a composition formula, pAO-qSi₃N₄-rSiO₂ (p+q+r=1),

0.1≦p≦0.95,   (1)

0.05≦q≦0.9, and   (2)

0≦r≦0.5, and   (3)

• • at least a metallic element M (M is one kind or two or more kinds of element(s) selected from Mn, Ce, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb) dissolved, in a solid state, in the composition.

It is aimed at providing an oxynitride powder, which is suitable for usage as a phosphor, is free from coloration due to contamination of impurities, and mainly includes a fine α-sialon powder. An oxynitride powder is produced by applying a heat treatment in a reducing and nitriding atmosphere, to a precursor compound including at least constituent elements M, Si, Al, and O (where M is one element or mixed two or more elements selected from Li, Mg, Ca, Sr, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), thereby decreasing an oxygen content and increasing a nitrogen content of the precursor.

A green phosphor for emitting light, a spectrum of which is sharp, in an ultraviolet and visible light region, which has higher green light brightness than the conventional rare earth-activated sialon phosphor and has higher durability than the conventional oxide phosphor, is provided. The phosphor being characterized in that Al and a metal element M (here, M is Eu) are incorporated into a crystal of a nitride or oxynitride having a βSi₃N₄ crystal structure as a solid solution, the content of oxygen in the crystal does not exceed 0.8% by mass, and that the phosphor emits a visible light having a luminescence peak wavelength in the range of 450 nm to 650 nm upon exposure to an excitation source is provided. This luminescence spectrum has a sharp spectrum shape. A manufacturing method of the phosphor, a lighting device and an image display device utilizing the phosphor are also provided.

The method for synthesizing sialon ceramic powder material by low cost is characterized by using metallurgical furnace slag or limestone or fly ash industrial waste material or cheap natural mineral as raw material, adding metal silicon powder, aluminium powder and partial crystal seed through the processes of ball grinding, drying, high-temp. self spreading and other treatment to obtain the invented single-phase alpha-sialon powder material. Said powder material possesses excellent sintering property, can be sintered without pressure at 1600-1800 deg.C, its density is up to 3.07g/se.cm, hardness is 15.53 GPa, and its toughness is 4.72 Mpa.m(1/2), as compared with Al2O3, ZrO2 and SiC ceramics its erosion resistance is excellent.

The invention discloses a preparing method of carbofrax fireproof ceramic material combined by beta-Sialon host phase, which comprises the following steps: adopting predisposal clay mineral raw material, industrial carbon powder and gas with nitrogen as main raw material to form beta-sialon hose combining phase; adding reacting accelerating addictive; adding different particle grades to allocate SiC particle; blending evenly with organic adhesive; moulding biscuit through ceramic moulding method; drying; loading in the high-temperature kiln-furnace with nitrogen; setting the reacting temperature under 1300-1550 deg.c for 3-36h; proceeding carbon heat-nitrogenizing reaction; setting each reacting sintering period at 10-100h; synthesizing the product.

The invention relates to a stemming, and especially relates to a stemming used in a non-blast-furnace taphole, wherein the non-blast-furnace taphole is used in molten iron smelting with a smelting reduction method. The stemming comprises: corundum 30-48 wt%, silicon carbide 7-20 wt%, a carbonaceous material 15-24wt%, sialon 10-20wt%, magnesium aluminate spinel 3-9wt%, kaolin 8-14 wt%, silicon-aluminum alloy 2-7wt%, and a tar and resin composite binding agent accounting for 16-24% of the total weight of the above materials. The stemming has good opening performance and mud-making performance. The stemming can resist erosion and corrosion of high-temperature high-pressure molten iron and slag. Especially, the stemming can resist corrosions of high-sulfur high-silicon molten iron and FeO-rich slag. When in use, a taphole depth is stable. The stemming is applied on a taphole of a smelting reduction furnace used in iron making.

To provide a Sialon-based phosphor having a high photoluminescent intensity, which can realize a high brightness LED, particularly a white LED using a blue LED as the light source, and a production method of the Sialon-based phosphor. The α-Sialon based phosphor of the present invention is represented by the formula:

Li_xM_yLn_zSi_12−(m+n)Al_(m+n)O_nN_16−n   (I)

wherein M is at least one metal selected from Ca, Mg and Y, Ln is at least one lanthanide metal selected from Eu, Dy, Er, Tb, Yb and Ce, x+ay+bz=m (assuming that the valence of metal M is a and the valence of lanthanide metal Ln is b), 0<x≦0.8, 0<y, 0<z, 0.3≦m<4.5, and 0<n<2.25.

A β-sialon phosphor particle in which Eu (europium) is solid-soluted in a crystal having a β-type Si₃N₄ crystal structure, wherein the median diameter (D₅₀) in the particle size distribution curve of the primary particle is from 3.0 to 10 μm and the aspect ratio is less than 1.5.

An α-sialon-based oxynitride phosphor characterized in that the content of α-sialon represented by the general formula: M_xS_12−(m+n)Al_(m+n)O_nN_16−n:Ln_y (wherein M is at least one metal selected from among Li, Ca, Mg, Y or lanthanide metals excluding La and Ce, Ln is at least one lanthanide metal selected from among Ce, Pr and La or at least one lanthanide metal selected from among Eu, Dy, Er, Tb and Yb, 0.3≦x+y<1.5, 0<y<0.7, 0.3≦m<4.5, 0<n<2.25, and m=ax+by, where a is the valence of the metal M and b is the valence of the lanthanide metal Ln), wherein all or a portion of the metal M dissolved in the α-sialon is replaced with the lanthanide metal Ln as the luminescence center, is 75 wt % or greater when the lanthanide metal Ln is at least one lanthanide metal selected from among Ce, Pr and La and 90 wt % or greater when the lanthanide metal Ln is at least one lanthanide metal selected from among Eu, Dy, Er, Tb and Yb, and in that the content of metal impurities other than the metal M, lanthanide metal Ln, silicon, IIIA elements (aluminum, gallium), oxygen and nitrogen, is no greater than 0.01 wt %.

An inner lining for the steel shell of a carbothermic reduction furnace for the production of alumina has a base layer of graphite and a coating layer of refractory material. The refractory material is corundum (Al₂O₃) bound by Sialon (Si.Al.O.N). The lining structure provides protection against the molten slag and it is not attacked by the CO-rich melt furnace atmosphere. Further, the lining does not contaminate the melt and it provides an effective heat dissipation system in case of a power shut-off.

An incandescent lamp color light emitting diode lamp comprises a semiconductor blue light emitting diode chip having a center emission wavelength in a range of from 400 nm to 480 nm and a phosphor that absorbs light emitted from the diode chip to emit light having a different wavelength than the light emitted from the diode chip. The phosphor is represented by a general formula of M_p(Si, Al)₁₂(O, N)₁₆:Eu²⁺_q. The main phase is an α-SiAlON phosphor having an α SiAlON structure, wherein M is at least one element of Ca, Y, Mg, Li, Sc, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Sr and p is from 0.75 to 1.0; and q is between 0.02 and 0.09. The diode lamp emits light having an emission color produced by a mixture of the light emitted from the semiconductor blue light emitting and the light emitted from the α-SiAlON. The chromaticity range thereof falls within the range defined by chromaticity coordinates (x, y) of (0.4775, 0.4283), (0.4594, 0.3971), (0.4348, 0.4185), and (0.4214, 0.3887) on the XYZ chromaticity diagram.

The refractory sialon corundum brick material for blast furnace is prepared with corundum grain and powder 60-75 wt%, metal silicon powder 5-12 wt%, metal aluminum powder 10-15 wt%, titania powder 1-8 wt%, alumina powder 3-9 wt%, silica powder 0-2 wt%, clay 0-2 wt% temporary paper pulp or phnolic resin binding agent 2-5 wt%, and through mixing, forming, drying, sintering at nitrogen atmosphere. The refractory sialon corundum brick material has excellent alkali resistance, excellent slag resistance, high heat shock stability, high wear resistance and excellent molten iron fuse loss resistance. The refractory sialon corundum brick material may be used widely for large and medium sized blast furnaces.

The invention relates to a technology that uses microwave quickly reacting nitriding sintering Sialon associated with silicon carbide refractory. The feature of the invention is that its bulk density is 2.68-3.2g/cm3, compressive strength is over 180MPa, bending strength is over 45MPa, degree of porosity is below 15%, good thermal shock resistance, good anti-oxygenic property and excellent alkali resistance. It also solves the technology problem of super thickness (100mm-200mm) Sialon nitriding reacting sintering with silicon carbide refractory material.

A liquid crystal display including a backlight and a filter, the backlight including a light-emitting device having a light-emitting element emitting blue light, and a green phosphor and a red phosphor absorbing a part of primary light emitted from the light-emitting element and emitting first secondary light and second secondary light, respectively, the green phosphor being a β-type SiAlON phosphor containing Eu and Al dissolved in a crystal of a nitride or an oxynitride having a β-type Si₃N₄ crystal structure, and the filter including filters for colors of red (R), green (G), blue (B) and yellow (Y), respectively, arranged in a plane for subpixels provided in each pixel of the liquid crystal display, which attains excellent color reproducibility (NTSC ratio) and high luminance, can be provided.

The present invention relates to one kind of composite magnesia-alumina spinel/Sialon ceramic material and its preparation process. The technological scheme is that the materials including alumina ash 25-95 wt%, fine magnesia powder 0.1-2 wt%, fine bauxite chamotte 0.5-55 wt%, fine silicon powder 0-30 wt%, fine aluminum powder 0-10 wt% and fine SiO2 powder 0-50 wt%, are prepared into the composite magnesia-alumina spinel/Sialon ceramic material through mixing, forming into biscuit, sintering in nitrogen atmosphere first at 1000-1100 deg.c for 0.5-5 hr, then at 1300-1350 deg.c reached in the rate of 2-5 deg.c/min for 1-6 hr and finally at 1360-1500 deg.c reached in the rate of 2-5 deg.c/min for 2-10 hr, and naturally cooling to room temperature in nitrogen atmosphere. The present invention has waste alumina ash as main material, environment friendship and low production cost.