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

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 thermal / environment barrier coating based on a ceramic composite material and a preparation method of the thermal / environment barrier coating. The thermal / environment barrier coating comprises a silicon layer, a ytterbium silicate layer, a transition layer and a hafnium oxide layer in sequence from inside to outside, wherein the transition layer is made by mixing hafniumoxide and ytterbium silicate. The preparation method comprises the following steps: respectively loading silicon powder, ytterbium silicate powder and hafnium oxide powder into a powder conveyer of low-pressure plasma spraying equipment, and carrying out drying treatment; immobilizing a ceramic composite material on a rotating platform in a vacuum chamber of the low-pressure plasma spraying equipment; preparing the silicon layer, the ytterbium silicate layer, the transition layer and the hafnium oxide layer in sequence on the surface of the ceramic composite material by using a low-pressure plasma spraying method to obtain the thermal / environment barrier coating on the surface of the ceramic composite material. The thermal / environment barrier coating provided by the invention is good in thermal insulation effect and excellent in high-temperature moisture corrosion resistance, and the preparation method provided by the invention has the advantages of being high in deposition efficiency, low in cost, uniform in coating and the like, and the thermal / environment barrier coating can be rapidly and integrally prepared.

The invention discloses a graphite support system for a preheating impact experiment of a gas gun / a fire gun. The graphite support system comprises a water cooling disc, a metal base and a graphite support body, wherein the middle part of the water cooling disc is provided with an accommodating groove; the metal base is connected with the interior ofinto the accommodation groove of the water cooling disc; the graphite support body is connected with the interior ofinto the metal base; the graphite support body is uniformly provided with a plurality of grooves for fixing a preheating impact experiment sample; a plurality of support legs for the preheating impact experiment sample are arranged in the multiple grooves to fix the preheating impact experiment sample. The graphite support systemhas the advantages that by adopting the leg support type, the graphite support body is arranged away from an induction coil, and an electromagnetic filed field produced by the induction coil can moreeffectively act onto the sample; the graphite support body is fixedly arranged on the water cooling disc through the metal base, so that the heat transferred out by the graphite support body is carried away by cooling water, and the temperature rise of the equipment after water cooling circulation is controlled within the an acceptable range; proofed by experiment, the sample with high temperatureof 2200 DEG C can be effectively supported, and the integrity of the graphite support body is maintained.

The invention discloses a CMAS-resistant ceramic layer and a preparation method thereof by a slurry method, and belongs to the field of thermal barrier coating materials and preparation thereof. The anti-CMAS ceramic layer of the present invention is a LaPO4 ceramic layer. The invention utilizes slurry method to prepare a layer of LaPO4 ceramic layer on the YSZ ceramic layer. The wettability of the LaPO4 ceramic layer to molten CMAS is poor. After heat treatment at 1250°C, a layer of mutual reaction layer is formed at the interface between the LaPO4 ceramic layer and CMAS. , effectively preventing the further infiltration of molten CMAS, and the YSZ ceramic layer maintains the original phase stability. Therefore, the LaPO4 ceramic layer prepared by the invention can prevent the infiltration of molten CMAS, has excellent CMAS corrosion resistance, and significantly improves the life of the thermal barrier coating under the coupling effect of CMAS.

The invention relates to a heat-resistant filter felt, a preparation method thereof and a composite filter felt prepared therefrom. The preparation method is as follows: blending modified polyphenylene sulfide fibers and polytetrafluoroethylene fibers and performing acupuncture or water The modified polyphenylene sulfide is a polyphenylene sulfide in which each sulfur atom is randomly connected to N oxygen atoms, and the molar ratio of oxygen atoms to sulfur atoms in the modified polyphenylene sulfide is It is 1.50~1.77:1. After the prepared heat-resistant filter felt is subjected to thermo-oxidative aging for 100 hours under air conditions at a temperature of 280° C., the tensile strength retention rate is above 90%. The composite filter felt made from it is mainly composed of a base cloth and a heat-resistant filter felt compounded with the base cloth. The preparation method of the present invention has simple process and low cost; the prepared heat-resistant filter felt has excellent heat resistance; the composite filter felt made of the heat-resistant filter felt has excellent heat resistance and mechanical properties, and has great application prospects .

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.

A heat treatment process for improving the thermal hardness and high temperature wear resistance of hot mold steel, mixing charcoal, urea particles, sodium carbonate powder and chromic anhydride to obtain a strong carbon-nitrogen binder; Put it into the infiltration box, seal the box cover of the infiltration box; put the infiltration box in a crucible electric furnace at a constant temperature of 850°C to 950°C for strong carbonitriding, and then after quenching, immerse the hot molded steel workpiece directly in quenching oil After cooling and air cooling, put it into a box-type medium-temperature tempering furnace for two temperings to obtain hot mold steel workpieces with high thermal hardness, high temperature and high wear resistance. The advantages are: easy operation, low cost and obvious effect, the surface hardness of the obtained hot mold steel can reach above 62HRC, and the high temperature wear resistance at 600 ℃ is more than twice that of the conventional heat treatment parts of the same kind of hot mold steel, which can effectively Improve the service life of hot work dies.

The invention discloses heat-resistant grease. The heat-resistant grease is characterized by comprising the following ingredients by mass percent: 70-80% of base oil, 20-12% of thickening agent, and 10-8% of other additives, wherein polyinternalolefin (PIO) is compounded with polyether to serve as the base oil of the heat-resistant grease, and a triuret thickener is utilized. The heat-resistant grease composition disclosed by the invention is good in overall performance, has good high-and-low temperature performance and lubricating property, excellent high temperature and oxidation stability, long high-temperature service life, excellent extreme pressure property and wear resistance, low frictional coefficient, strong carrying capacity, excellent mechanical stability and water resistance, high oil film strength, and excellent anti-rust and anti-corrosion performances and biodegradability, is suitable for lubricating and sealing of a bearing, a valve and a friction component which run under bad work conditions such as extreme high temperature, heavy load, and humid and polluted conditions, and can provide the maximal anti-wear, anti-rust and anti-corrosion protection.

The invention relates to a single-component high-temperature self-crosslinking waterborne polyurethane preparation method. Single-component high-temperature self-crosslinking waterborne polyurethane is prepared by copolymerization of alkenyl end capped waterborne polyurethane, alkenyl oxazoline and acrylate monomer, wherein the use amount of the alkenyl oxazoline is 1 to 40% of the total amount ofresin. A solid content of prepared emulsion polymer is 15 to 60%, a pH value is 6 to 8, and a molecular weight is 10000 to 200000. According to the preparation method disclosed by the invention, oxazoline radicals are introduced into a waterborne polyurethane structure through copolymerization of the polyurethane, the alkenyl oxazoline and the acrylate; no crosslinking agent is utilized; comparedwith normal-temperature self-crosslinking waterborne polyurethane, storage stability of the obtained emulsion polymer is improved, and high-temperature service life of the obtained emulsion polymer is prolonged; after film formation, the obtained emulsion polymer has excellent water resistance, acid and alkali resistance and chemical resistance; meanwhile, the obtained emulsion polymer further has excellent physical and mechanical properties of large hardness, high elasticity, scratch resistance and the like.