48results about How to "Extend high temperature service life" patented technology

The present invention relates to a Li₂O-Al₂O₃-SiO₂ system ultra-low expansion coefficient high-transparency glass-ceramic and production method of the products. Calculated by weight percentage, the ultra-low expansion coefficient high-transparency glass-ceramic is composed of 3.2 to 4.6 percent of Li₂O, 18.0 to 23.6 percent of Al₂O₃, 64.1 to 69.4 percent of SiO₂, 0.3 to 0.8 percent of MgO, 0.8 to 2.5 percent of BaO, 0.3 to 0.8 percent of R₂O, 0.01 to 0.4 percent of Y₂O₃, 1.8 to 2.5 percent of TiO₂, 1.6 to 2.4 percent of ZrO₂, 1.1 to 1.8 percent of P₂O₅, 0.6 to 1.5 percent of Sb₂O₃, 0.3 to 1.0 percent of NaCl and 1.0 to 2.0 percent of NH₄NO₃. The heat-resistant glass plates and heat-resistant glass products can be manufactured by using the formula and the corresponding forming die. The present invention has the advantages that the production technique is simple, the produced products have low expansion coefficient, good transparency, high thermal impact temperature, high strength, have constant transparency when being used under the temperature of 700 Celsius system for a long time, the products have long service life, etc.

The invention discloses a CMAS-resisting ceramic layer and a slurry method for preparing the CMAS-resisting ceramic layer, and belongs to the field of thermal barrier coating materials and preparation for the same. The CMAS-resisting ceramic layer is a LaPO4 ceramic layer. The slurry method is used for preparing the LaPO4 ceramic layer on a YSZ ceramic layer, and the wettability of the LaPO4 ceramic layer to molten CMAS is poor; after thermal treatment of 1250 DEG C is carried out, a mutual reaction layer is formed on the interface between the LaPO4 ceramic layer and the CMAS, so that further permeation of the molten CMAS is effectively prevented, and the original phase stability of the YSZ ceramic layer is maintained. Accordingly, the prepared LaPO4 ceramic layer can prevent permeation of the molten CMAS, has superior CMAS corrosion resistance and obviously prolongs the service life of a thermal barrier coating under the CMAS coupling effect.

The invention belongs to the technical field of alloy steel and particularly relates to a heat treatment method for high-temperature alloy steel. The heat treatment method comprises the steps of a, a high-temperature diffusion annealing process, wherein a high-temperature alloy steel ingot is heated for 22-26 h at the temperature of 1,150 plus or minus 10 DEG C, then heating is conducted for 70-74 h at the temperature of 1,190 plus or minus 10 DEG C, and then air cooling is conducted; b, pretreatment after forging, wherein the heating temperature is 950 plus or minus 10 DEG C, the temperature is kept for 0.5-1.5 h, and then air cooling is conducted; c, high-temperature solid solution treatment, wherein the heating temperature is 910 plus or minus 10 DEG C, the temperature is kept for 18-24 h, and then air cooling is conducted; and reheating is conducted, the heating temperature is 960 plus or minus 10 DEG C, the temperature is kept for 1-2 h, and air cooling is conducted; and d, low-temperature aging treatment, wherein the heating temperature is 710 plus or minus 10 DEG C, the temperature is kept for 7-10 h, then the temperature is decreased to 610 plus or minus 10 DEG C at the speed of 50-60 DEG C/h with furnace cooling, then the temperature is kept for 7-10 h, air cooling is conducted, and a forging is obtained. By the adoption of the heat treatment method for the GH4169 high-temperature alloy steel, the heating pretreatment after forging, high-temperature solid solution treatment and low-temperature aging treatment thermal treatment process system is adopted, the high-temperature plasticity is good and the creep resistance life is long.

The invention provides a heat treatment process improving the hot hardness and the high temperature abrasion resisting performance of hot mold steel. Charcoal, urea particles, sodium carbonate powderand chromic anhydride are mixed to obtain a carbon-nitrogen strong permeating mixture; a hot mold steel workpiece and the carbon-nitrogen strong permeating mixture are installed in a permeating box atthe same time, and a box cover of the permeating box is sealed; the permeating box is placed into a crucible type electric furnace to be subjected to constant temperature carbon-nitrogen strong permeating at 850-950 DEG C; after quenching treatment, the hot mold steel workpiece is directly immersed into quenching oil to be cooled; and after air cooling, placing into a box type intermediate temperature tempering furnace for tempering twice is performed, and the hot mold steel workpiece high in hot hardness and high in high temperature abrasion resisting performance is obtained. The heat treatment process has the advantages of being easy and convenient to operate, low in cost and obvious in effect, the surface hardness of the obtained hot mold steel can reach 62 HRC or above, the high temperature abrasion resisting performance under the temperature of 600 DEG C exceeds that of a same hot mold steel conventional heat treatment piece twice or above, and the service life of a hot working mold can be effectively prolonged.

The invention belongs to the technical field of refractory material, and in particular relates to a porous mullite fiber product. The fiber product comprises the following components according to weight percentage: 85wt%-95wt% of modified mullite fiber, 1wt%-5wt% modified carbon fiber, 0.1wt%-1wt% of calcined alumina powder, 0.5wt%-2wt% silica sol, 0.2wt%-1.2wt% of sodium hypochlorite, 0.7wt%-1.3wt% of starch, and 0.5wt%-1.5wt% of an additive; the mullite fiber comprises the following chemical components: 50wt%<= Al2O3<= 70wt%, 25wt%<= SiO2<= 28wt%, and oily substances > 2wt%. The invention can prolong the service life of the mullite fiber porous product, and enhance the thermal insulation effect.

The invention relates to a high temperature resistant alloy and its preparation method, and concretely relates to a high temperature resistant alloy containing zero or less nickel. A nanometer ceramic composite nickel substitute alloy (nickel substitute alloy D for short) is adopted to replace isometric nickel generally used in high temperature alloys to make the alloys have a good casting performance, good mechanical performances in a casting state and a good weldability. The high temperature resistant alloy which is a steel has oxidation, carburizing and sulfuration resistances at a high temperature of 1250-1350DEG C; and compared with traditional high temperature alloys (such as ZG2Cr25Ni20Si2), the high temperature resistant alloy provided by the invention has the advantages of above 20% tensile strength increase, above 40% service life prolongation, and 30% cost reduction. The high temperature resistant alloy has a high high-temperature strength, can be widely applied to structural parts having high temperature resistance requirements, comprising heat treatment bed plates, bottom rollers, quenching normalising trays, material frames, power plant boiler high temperature burners, combustors, ash falling tubes, steel factory steel rolling rollers, guide rollers, magnesium melting reduction tanks and the like, and has the characteristics of great cost reduction and service life prolongation on the premise that use requirements are satisfied.

The invention discloses a high-performance carbon-carbon crucible surface coating and a preparation method thereof, and relates to the technical field of carbon-based composite materials. The invention discloses a high-performance carbon-carbon crucible surface coating. The coating is mainly characterized in that a SiC transition layer and a LaB6/Y3Al5O12 outer coating are sequentially deposited on a substrate of a carbon-carbon crucible, the SiC transition layer is deposited by adopting a multi-time embedding method, and the LaB6/Y3Al5O12 outer coating is formed by coating by adopting a slurry method; and the SiC transition layer is formed by dipping treatment of an organic silicon impregnant and then brushing of outer coating slurry. The invention further discloses a preparation method of the carbon-carbon crucible surface coating. The carbon-carbon crucible surface coating provided by the invention has excellent high-temperature strength, high-temperature toughness and high wear resistance, is good in thermal shock resistance and chemical stability, and has relatively high thermal expansion compatibility with a carbon-carbon matrix, so that the service life of the carbon-carbon crucible is remarkably prolonged, the damage resistance degree of the carbon-carbon crucible is remarkably improved, and the carbon-carbon crucible can be used for resisting oxidation for a long time at 1,750 DEG C.

The invention discloses a method for preparing low-oxygen molybdenum and molybdenum alloy clad with Al4SiC4-HfC. The method for preparing low-oxygen molybdenum and molybdenum alloy clad with Al4SiC4-HfC adopts an injection filling method, and specifically comprises that Al4SiC4-HfC powder and a compound binding agent are mixed in a volume ratio of 1:(3-2) into slurry, and the slurry is injected and filled at the periphery of molybdenum and molybdenum alloy powder in a pressing mould with the filling thickness of 1-3mm; pressing at a pressure of 50-100KN is carried out, so that a molybdenum and molybdenum alloy pressed blank clad with Al4SiC4-HfC is formed; then the conventional sintering and annealing are carried out on molybdenum and molybdenum alloy, so that a Al4SiC4-HfC clad low-oxygen molybdenum and molybdenum alloy material is prepared. The prepared Al4SiC4-HfC clad low-oxygen molybdenum and molybdenum alloy material has the advantages of excellent oxidation resistance, long service life, high bonding strength between a cladding layer and a matrix, good compatibility, low cost and simple technology.

The invention relates to a multiphase environmental barrier coating formed on a base material and a preparation method thereof. The multiphase environmental barrier coating sequentially comprises a silicon bonding layer, a mullite layer and a Lu2SiO5-Sc2Si2O7 multiphase ceramic layer from the base material to the outside, wherein the Lu2SiO5-Sc2Si2O7 multiphase ceramic layer is formed by mixing lutetium silicate and scandium silicate. The method comprises the following steps: filling silicon powder, mullite powder and mixed powder formed by mixing lutetium silicate powder and scandium silicatepowder into a powder feeder of ultra-low pressure plasma spraying equipment and carrying out drying treatment; fixing the base material to a rotating table in a spraying cabin; and sequentially preparing the silicon bonding layer, the mullite layer and the Lu2SiO5-Sc2Si2O7 multiphase ceramic layer on the surface of the base material to prepare the multiphase environmental barrier coating. The multiphase environmental barrier coating is long in thermal shock resistance life and excellent in high-temperature water-oxygen corrosion resistance; and the method provided by the invention can be usedfor rapidly and integrally preparing the multiphase environmental barrier coating at low cost in an ultra-low pressure environment.

The invention discloses an electrothermal alloy material with an excellent high-temperature resistant grain growth behavior and a manufacturing method thereof. The electrothermal alloy material comprises, by mass, not larger than 0.06% of C, 19.5% to 23.5% of Cr, 5.5% to 6.5% of Al, not larger than 0.03% of N, not larger than 0.5% of Si, not larger than 0.5% of Mn, not larger than 0.03% of P, not larger than 0.03% of S, 0.05% to 0.25% of Zr, 0.01% to 0.2% of Y, 0.5% to 2.5% of Co, and the balance Fe and inevitable impurities. A vacuum induction melting process method is adopted, casting molding is performed after melting, and the material is finally manufactured through hot forging, hot rolling, recrystallization heat treatment, cold rolling and cold drawing. By the adoption of the electrothermal alloy material, the abnormal high-temperature grain growth behavior of Fe-Cr-Al alloy is overcome, the oxidation resistance is improved, heat resistance is improved as well, high-temperature corrosion resistance is enhanced, and the comprehensive performance is excellent.

The invention provides a waterproofing and low-voltage aluminum electrolytic capacitor working electrolyte and a preparation method and application thereof. The electrolyte includes a solute, a main solvent, an auxiliary solvent, a water repellent and other additives, and the water repellent is a mixture of ethylene glycol, lauryl phosphate and hexadecyl phosphate and is obtained by mixing the ethylene glycol, the lauryl phosphate and the hexadecyl phosphate with the ratio of 8:1:1 by the mass percent at the temperature of 100-120 DEG C. The electrolyte provided has good high-temperature stability, and the capacitor assembled by the electrolyte has a long service life at a high temperature, and can achieve a life of more than 20000h at a working voltage U<=100V under the temperature of 105DEG C.

The invention discloses a high temperature resistance and corrosion resistance abrasion-resistant surfacing electrode, which comprises a core wire and a coating, wherein the coating comprises the following components in parts by weight: 1 to 4 parts of marble, 2 to 6 parts of fluorite, 1 to 5 parts of titanium white, 3 to 9 parts of quartz, 20 to 60 parts of chrome carbide, 20 to 60 parts of high-carbon ferrochrome, 2 to 10 parts of mid-carbon Fe-Mn, 2 to 10 parts of molybdenum powder, 2 to 10 parts of tungsten carbide, 5 to 20 parts of ferrocolumbium, 2 to 10 parts of ferrovanadium, 3 to 10 parts of ferrous powder, 1 to 5 parts of aluminum powder, 0.2 to 1.5 parts of ferrotitanium, 5 to 20 parts of crystalline flake graphite, 0.5 to 3 parts of ferrosilicon, 0.5 to 1.5 parts of potassium carbonate, 0.5 to 2 parts of rare earth ferrosilicon and 10 to 20 parts of potassium sodium water glass. The workpiece subjected to surfacing by the electrode can continuously work at the high temperature of 800 DEG C and maintains high hardness and excellent corrosion resistance performance and abrasion resistance performance to abrasive materials, and the high temperature service life of the workpiece can be effectively enhanced.