33results about How to "High temperature limit" patented technology

The present invention relates to transient liquid phase sinter pastes for electronic interconnects, and sinter paste application and processing methods.

The invention belongs to the field of polymer materials, and in particular relates to silicon-modified hyperbranched polyurethane and a preparation method thereof. The preparation method is as follows: first, isocyanato-terminated linear polyurethane is synthesized and then reacted with a silane coupling agent to obtain siloxane-terminated linear polyurethane, then triethylamine and deionized water are added to obtain aqueous polyurethane, finally, ammonia and absolute ethanol are added for crosslinking under alkaline conditions to obtain the silicon-modified hyperbranched polyurethane. Compared with the prior art, the method has the beneficial effects that the aqueous hyperbranched polyurethane using silicon atoms as a crosslinking center can be obtained by relying on silane coupling agent molecules to modify the polyurethane, hyperbranched reaction is performed in an aqueous phase, use of a volatile organic solvent is avoided, the use amount of the organic solvent is reduced, the method is environmentally-friendly and energy saving, by the introduction of organic silicon, the heat resistance of the polyurethane is greatly improved, the use temperature limit of the polyurethane is improved, and the expansion field of the polyurethane is facilitated.

The invention relates to the technical field of fluorescence temperature measurement, in particular to a fluorescence temperature measurement method suitable for an ultra-wide temperature measurement range. The fluorescence temperature measurement method comprises the following steps of: (a) establishing a standard curve of a fluorescence peak intensity ratio of Pr < 3 + >-based 3P1-to-3F2 transition and 3P0-to-3F2 transition of a fluorescence temperature sensing material along with temperature change; and (b) placing the fluorescence temperature sensing material in an environment of which the temperature is to be measured, measuring the fluorescence spectrum of the fluorescence temperature sensing material, calculating the fluorescence peak intensity ratio of Pr < 3 + >-based 3P1-to-3F2 transition and 3P0-to-3F2 transition, substituting the fluorescence peak intensity ratio into the standard curve, and calculating to obtain a temperature measurement value of the to-be-measured environment, the fluorescence temperature sensing material being Pr < 3 + >-doped oxide transparent ceramic, and the molar doping concentration of Pr < 3 + > being 0.1%-10%. According to the temperature measurement method, a higher temperature measurement limit and a wider temperature measurement range can be realized.

The present invention provides a hydrophobic thermoplastic starch and method for manufacturing the same, to be used as granules for making biodegradable composites. The hydrophobic thermoplastic Starch of the invention is in a granule type, has the melt flow index in the range of 0.2˜6 g/10 min at 160° C. and has 60˜80 wt % of starch and the water content less than 9%.

The invention provides high-toughness high-temperature-resistant RAFM steel which comprises the following chemical components: 0.12 to 0.16 percent of C, 9.5 to 10.5 percent of Cr, 1.6 to 1.8 percent of W, 0.48 to 0.52 percent of Si, 0.6 to 0.7 percent of Mn, 0.23 to 0.27 percent of V, 0.10 to 0.26 percent of Ta, 0.001 to 0.005 percent of Zr and the like. The heat treatment parameters are as follows: the normalizing temperature is 1010-1050 DEG C, the normalizing time is 20-55 minutes, the tempering temperature is 600-720 DEG C, and the tempering time is 50-90 minutes. The invention further provides a machine learning-based design method of the steel. The RAFM steel disclosed by the invention has a relatively high use temperature upper limit and also has a relatively good tensile property at a high temperature; and meanwhile, the machine learning method constructed by the invention is high in generalization ability, and reasonable components and heat treatment parameters can be quickly and efficiently designed.

The invention relates to the technical field of nanocomposite material. A preparing method of a silver nanoparticle mixed filler modified silicone rubber conductive composite material is provided, and aims to solve the problems that silver nanoparticles prepared through a regular method have high surface energy which is prone to agglomeration, compatibility between the silver nanoparticles and a silicone rubber basal body is poor, and thus the silver nanoparticles is so hard to be evenly dispersed in the basal body that comprehensive performance of the composite material is affected. The preparing method comprises the steps of preparing silver nanoparticles by adopting a chemical reduction method and conducting surface modification by using a silane coupling agent so as to make the silver nanoparticles evenly disperse in an organic solvent, and with a combination of a silver nanowire, dispersing the silver nanoparticles and mixed filler of the silver nanoparticles into a silicone rubber basal body by adopting a solution blended process so as to prepare an elastic silicone rubber composite material with excellent electrical conductivity. The composite material not only has the advantages of being stable in resistance time property, high in temperature limit, controllable in resistance temperature coefficient and the like, but also has high elasticity of a rubber material.

The invention discloses a method and device for measuring high temperature through a micro spectrometer. According to the method, the micro spectrometer is used for measuring thermal radiation energy intensity of an object in the wave band range of 200-1000 nm, certain conversion and fitting are conducted on a thermal radiation energy intensity curve, and the temperature of the measured object can be calculated. The measurement temperature range of the method is 1000-10000 K. The method has the advantages of being high in temperature measurement upper limit, high in speed, high in measuring precision, good in stability and not limited by material surface appearance, emissivity and other factors. The device mainly comprises an optical system, a CCD spectrometer and a data processing unit, and has the advantages of being simple in structure, low in cost, small in size, low in weight, convenient to carry and the like.

The invention discloses a high-fluidity samarium-iron-nitrogen flexible bonded permanent magnet for injection molding and a preparation method thereof. The high-fluidity samarium-iron-nitrogen flexible bonded permanent magnet comprises the following components: 90-94 parts by weight of samarium-iron-nitrogen magnetic powder, 3-5 parts by weight of a rubber binder, 2-3 parts by weight of a plasticizer, 0.5-1 part by weight of a heat stabilizer and 0.5-1 part by weight of a lubricant. According to the invention, the samarium-iron-nitrogen flexible bonded permanent magnet meets the latest ROHS2.0standard certification standard, and has export and foreign exchange earning conditions; the injection-molded flexible samarium-iron-nitrogen magnet fills up the blank of a high-fluidity area of theinjection-molded flexible samarium-iron-nitrogen magnet, improves the upper limit of the use temperature of the current flexible bonded magnet from 80 DEG C to 120 DEG C, widens the use field, and improves the stability and reliability thereof.

The invention discloses a composite high-temperature-resistant cable bridge, and coating technology, and belongs to the technical field of cable bridges. The composite high-temperature-resistant cablebridge comprises a bridge main body; the external surface of the bridge main body is coated with an internal high temperature resistance layer and an external anti-corrosion layer; the external anti-corrosion layer is prepared through coating of an epoxy coating, and the thickness ranges from 1 to 2mm; the internal high temperature resistance layer comprises, by weight, 55 to 65 parts of polycarbosilane, 4 to 9 parts of glass fiber, 9 to 11 parts of m-benzol unsaturated polyester resin, 20 to 25 parts of acrylic resin, 13 to 14 parts of alumina, 12 to 16 parts of iron oxide, 10 to 15 parts ofdioctyl phthalate, 5 to 9 parts of polyacrylamide, 3 to 5 parts of perlite, 2 to 4 parts of acetylene carbon black, and 4 to 7 parts of sodium bicarbonate. The composite high-temperature-resistant cable bridge possesses excellent corrosion resistance and high temperature resistance, and the service life of the composite high-temperature-resistant cable bridge is prolonged.

A fuel cell (1) includes an anode (11), a cathode (14), an electrolyte layer (13) containing ceria and provided between the anode (11) and the cathode (14), and at least two intermediate layers containing zirconia and provided between the electrolyte layer (13) and the anode (11). The at least two intermediate layers include a first intermediate layer (18) that contains ceria and a second intermediate layer (19) that has a higher zirconia concentration than the first intermediate layer and is provided between the first intermediate layer and the anode.

A plastic molding die provided with a cavity where a plastic material is put in, wherein a part of an inner surface of the cavity is configured with an elastic body. A molding portion corresponding to a molding surface of a molded product is disposed on the inner surface of the cavity, and the elastic body is arranged on a portion other than the molding portion of the inner surface of the cavity. The plastic molding die may be a molding die for compression molding. The elastic body is made of rubber, and has an upper temperature limit higher than a glass-transition temperature of the plastic material. The degree of rubber hardness of the elastic body is from 50 to 100.