50results about How to "Low creep rate" patented technology

In a method of amplifying optical input signals over a wide bandwidth, the optical input signals are applied to an optical waveguide made from a rare-earth-doped amorphous yttrium aluminum oxide material (e.g., erbium-doped yttrium aluminum oxide material). The optical input signals include optical signals having wavelengths shorter than 1,520 nanometers and optical signals having wavelengths longer than 1,610 nanometers. Preferably, the wavelengths range from as short as approximately 1,480 nanometers to as long as approximately 1,650 nanometers. Pump light is applied to the optical waveguide to cause the waveguide to provide optical gain to the optical input signals. The optical gain causes the optical signals to be amplified within the waveguide to provide amplified optical signals over the extended range from approximately 1,480 nanometers to approximately 1,650 nanometers, including, in particular, optical signals having wavelengths shorter than 1,520 nanometers and optical signals having wavelengths longer than 1,610 nanometers. Alternatively, the wavelengths of the optical input signals may be in the range from approximately 1,480 nanometers to approximately 1,565 nanometers. As a further alternative, the wavelengths of the optical input signals may be in the range from approximately 1,565 nanometers to approximately 1,650 nanometers.

A guide vane for a gas turbine includes a vane body having a leading edge and a trailing edge and a shroud extending at least between the leading edge and the trailing edge. The shroud has a first side wall and a second side wall extending essentially radially and in a longitudinal direction of the gas turbine. The first side wall has a groove disposed in a region of the trailing edge extending in a longitudinal direction of the shroud and is configured to receive a sealing plate. The first side wall also has a clearance extending from the groove in a region of the trailing edge, wherein a depth of the clearance in a circumferential direction of the gas turbine is equal to a depth of the groove, and wherein a width of the clearance in the longitudinal direction of the shroud is between one to three times the depth of the clearance.

A corundum fireproof ball used for a ball-type hot-blast stove and a preparation method thereof are characterized in that the corundum fireproof ball comprises the following main materials, adhesive and additive, wherein the main materials comprises the following raw materials by weight percentage: 0-15% of corundum (granularity of 5-3mm), 30-60% of corundum (granularity of 3-1mm), 5-30% of corundum (granularity of 1-0.088mm), 0-10% of corundum (granularity less than 0.044mm), 10-25% of bauxite chamotte (granularity less than 0.088mm), 2-10% of Alpha-Al2O3 grain, 1-10% of zirconia-contained material, 2-8% of clay and 2-10% of mullite or materials containing mullite which is taken as main phase; the adding amount of the adhesive is 1-6% of the weight of the main materials; and the adding amount of the additive is 0-1% of the weight of the main materials. The preparation method comprises the following steps of ageing mixture, back-rolling, pressing and molding, drying billet, and sintering in a tunnel kiln and the sintering temperature is within 1450-1600 DEG C.

The invention relates to a high-ring-stiffness internal rib-reinforced corrugated pipe. The high-ring-stiffness internal rib-reinforced corrugated pipe is prepared by extruding and shaping outer materials and inner materials with an extruder, wherein the outer materials is composed of, by weight part, 85-100 parts of high-density polyethylene, 15-25 parts of polypropylene, 5-15 parts of filler, 1-2 parts of bulking agent and 1-3 parts of color masterbatch; the inner materials is composed of 85-100 parts of high-density polyethylene, 15-25 parts of polypropylene, 1-2 parts of bulking agent and1-3 parts of color masterbatch. Compared with the prior art, the high-ring-stiffness internal rib-reinforced corrugated pipe is higher in ring stiffness, light in weigh per meter and capable of greatly reducing the costs of raw materials.

Disclosed is a breeding nuclear fuel mixture including metallic thorium useable in a nuclear power plant, prepared by mixing uranium dioxide (UO₂) or plutonium dioxide (PuO₂) having ceramic properties with metallic thorium (Th), in order to enable thorium breeding by neutrons released during nuclear fission of U or Pu and conversion of the bred thorium into a novel nuclear fissile material, i.e., U-233, thereby ensuring continuous nuclear fission. The foregoing nuclear fuel mixture may be burned at a reactor core of a nuclear power plant through thorium breeding over a long period of time. Therefore, when the inventive breeding nuclear fuel mixture is employed in a nuclear power plant, utilization of the nuclear power plant may be increased while maximizing conservation of limited uranium resources.

The invention provides a fireproof material. The fireproof material is prepared from the following components in percentage by mass: 48-62 percent of andalusite, 20-35 percent of sillimanite, 4-8 percent of aluminum oxide, 5-15 percent of corundum, 2-6 percent of combined clay, 1-3 percent of silica powder, 0.5-1.5 percent of paper pulp powder and 0.1-0.3 percent of a water reducing agent. In the fireproof material prepared from the high-purity andalusite and sillimanite, the high-purity corundum and the high-purity aluminum oxide are also added for strengthening a base material so that a main crystal phase mullite in the base material is columnar, long column-shaped or needle-shaped and a special network structure is formed; meanwhile, the needle-column-shaped mullite in the base material forms an interlaced network structure with the andalusite and the sillimanite, so the fireproof material disclosed by the invention is extremely good in thermal shock resistance and stability, relatively high in refractoriness under load (higher than 1700 DEG C) and relatively low in creep rate (0.125%). The invention also provides a preparation method of the fireproof material and a fireproof brick.

Articles, such as tubing or strips, which have excellent corrosion resistance to water or steam at elevated temperatures, are produced from alloys having 0.2 to 1.5 weight percent niobium, 0.01 to 0.6 weight percent iron, and optionally additional alloy elements selected from the group consisting of tin, chromium, copper, vanadium, and nickel with the balance at least 97 weight percent zirconium, including impurities, where a necessary final heat treatment includes one of i) a SRA or PRXA (15-20% RXA) final heat treatment, or ii) a PRXA (80-95% RXA) or RXA final heat treatment.

The invention relates to a porous mullite-corundum ceramics preparation method. The method takes bauxitic clay and diatomite as raw materials, then employs steps of wet grinding, filtering, drying and stirring, and additionally adds a binder, a dispersant, a foam stabilizer and a foaming agent, and finally the product is molded, dried and sintered to obtain the porous mullite-corundum ceramics. The method has the characteristics of simple process, short production period, high efficiency, stable product quality, and low cost. The porous mullite-corundum ceramics material can be prepared according to the requirement, and has good industrial utilization prospect.

The invention relates to a low-creep high-alumina brick and a preparation method thereof. The low-creep high-alumina brick comprises the following raw materials in parts by weight: 50-60 parts of high-alumina material, 5-20 parts of high-alumina powder, 5-20 parts of alumina powder, 0-20 parts of sillimanite powder, 5-20 parts of andalusite powder and 5-15 parts of Guangxi white mud. The method comprises: mixing and uniformly stirring the high-aluminum material, the high-aluminum powder, the aluminum oxide powder, the sillimanite powder and the andalusite powder in proportion, adding a properamount of water, stirring for 10 minutes, adding the Guangxi white mud, and mixing and stirring for 10 minutes, and after the mixed pug is pressed and formed, drying and sintering to obtain a finishedproduct. The low-creep high-alumina brick has the advantages of high compressive strength and low creep, and the preparation method is simple, low in cost and convenient for batch production.

The invention provides a basalt fiber insulator core rod. The core rod comprises basalt fibers, high-temperature-resistant resin and a curing agent, wherein the core rod is formed by adopting a pultrusion process, the section of the core rod is round or similar to a circle, the volume fraction of the basalt fiber is 65-75%, the volume fraction of the high-temperature-resistant resin is 20-40%, andthe volume fraction of the curing agent is 5-10%. According to the basalt fiber insulator core rod, the tensile strength is 1200-1500 MPa, the bending strength is 1200-1400 MPa, the mechanical strength is high, the requirement of the electric power industry for a large-diameter high-strength core rod is met, meanwhile, the structure is reliable, the performance is stable, the safe operation margin is large, flashover, breakdown and pollution flashover accidents are avoided, and safe operation of a line is guaranteed. Besides, the basalt fiber insulator core rod is high in temperature resistance and insulating property, the requirements of high-voltage and extra-high-voltage circuits for large-diameter high-strength core rods are met, and the increasingly-developed requirements of the power industry are met.

Isopipes (13) for making a glass or a glass-ceramic using a fusion process are provided. The isopipes are made from an alumina material which has a higher static fatigue than existing alumina materials intended for use as isopipes. In particular, the alumina materials have times-to-failure (static fatigues) of greater than one hour at 1200 DEG C at an applied stress of 10,000 psi. These high levels of static fatigue allow alumina isopipes to replace zircon isopipes in the manufacture of high performance glass sheets by the fusion process, including glass sheets which are incompatible with zircon isopipes but compatible with alumina isopipes, e.g., chip and scratch resistant glass sheets which have high alkali contents.

The invention discloses a glass microsphere and glass fiber composite reinforced corrugated pipe and a production method of the glass microsphere and glass fiber composite reinforced corrugated pipe. A pipe body comprises an inner wall and an outer wall. The outer wall comprises wave crest sections and wave trough sections, wherein the wave crest sections and the wave trough sections are regularly spaced in sequence. The inner wall is formed by a smooth pipe body layer. A composite reinforced material of the outer wall contains glass microspheres and glass fibers. The production method of the glass microsphere and glass fiber composite reinforced corrugated pipe comprises the steps that the hollow glass microspheres and the chopped glass fibers are added into the composite reinforced material of the outer wall, and the color of the inner wall and the color of the outer wall are distinguished. The superfine glass microspheres in the corrugated pipe contain gas, are of a hollow structure, have the advantages of low heat conductivity coefficient, light weight, smooth surface and the like, and can be used for preparing pipes with good thermal insulation and mechanical properties. The glass fibers in the corrugated pipe have the advantages of high tensile strength, good heat resistance, heat insulation, sound insulation, flame retardance, acid and alkali resistance, excellent insulativity and the like, and can be used for preparing the heat-resistant, acid-resistant, alkali-resistant and high-strength pipes.

The invention discloses a resintered fused mullite brick and a preparation method and application thereof. The resintered fused mullite brick comprises the following raw materials in percentage by weight: 20-40% of fused mullite coarse material, 8-35% of fused mullite medium material, 8-35% of fused mullite fine material, 3-35% of fused mullite ball powder, 1.5-20% of fused mullite micro powder, 0-6% of alpha alumina micro powder, 0%-8% of kaolin, 1%-2% of a solid binding agent and 1%-2% of a liquid binding agent; the resintered fused mullite brick has characteristics of low porosity, good quality and prolonged service life, and further has low creep rate at a high temperature.

The invention discloses a high-temperature-resistant low-creep sealing plate and a preparation process thereof. The sealing plate comprises a metal base material, and rubber layers coating the upper surface and the lower surface of the modified metal base material, wherein the rubber layers are obtained by airing a rubber mixture. The prepared sealing plate combines the high strength of the metal base material and the high elasticity and compressibility of the rubber layer, and is low in weight, high in sealing performance, excellent in thermal oxidation resistance, high in binding force between the metal base material and the rubber layer, low in creep relaxation rate, wide in application range and high in sealing performance, and peeling and stripping cannot occur even if the sealing plate works in a high-temperature environment for a long time, the application range is wide, and the practicality is high.

The invention relates to a preparation method of porous mullite-corundum perovskite loaded La1-xKxCo0.7Fe0.3O3 (x is equal to 0.2 to 0.8). The preparation method comprises the following steps: preparing a porous mullite-corundum material by taking bauxite and diatomite as raw materials through carrying out wet milling, filtering, drying and stirring, additionally adding a binding agent, a dispersant, a foam stabilizer and a foaming agent, and molding, drying and sintering; then loading perovskite on a porous mullite-corundum carrier by adopting a vacuum impregnation and calcining method to prepare a porous mullite-corundum perovskite loaded La1-xKxCo0.7Fe0.3O3 material. The preparation method has the characteristics of simple process, short production period, high efficiency, stable product quality, low cost and the like; the porous mullite-corundum perovskite loaded La1-xKxCo0.7Fe0.3O3 material can be produced and prepared according to requirements and the preparation method has a relatively good industrial utilization prospect.

The invention discloses a polytetrafluoroethylene composite material for mechanical seal and a preparation method of the polytetrafluoroethylene composite material for mechanical seal. The polytetrafluoroethylene composite material is prepared from, by weight, 48-55 parts of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, 22-35 parts of polybutadiene, 2-6 parts of chlorinated polyethylene, 1.5-2.2 parts of polyacrylonitrile-based carbon fiber, 0.8-1.5 parts of polytetrafluoroethylene micropowder, 1.2-1.6 parts of antioxidant DNP, 0.5-0.8 part of stearic acid, 5-8 parts of fire retardant, 0.6-0.9 part of assistant crosslinker, 2.2-2.6 parts of plasticizer and 0.8-1.2 parts of bismuth oxide by mixing, granulating, extrusion molding, radiation crosslinking and post processing. The polytetrafluoroethylene composite material is low in friction coefficient, abrasion loss and creep rate and has excellent abrasion resistance and long service life. Compared with a traditional polytetrafluoroethylene seal ring made by mould pressing, a seal ring made of the polytetrafluoroethylene composite material has the advantages of remarkable leakage reduction and promising application prospect.