10results about How to "High melting point" patented technology

The application discloses an alloy cushion block for a large walking beam heating furnace and a preparation method thereof, and the preparation method comprises the following steps: S1, determining the melting point of the alloy cushion block based on the atomic penetration depth of an alloy B containing FeO on multiple different alloy A with a melting point higher than that of the alloy B; S2, studying the load-bearing condition of the alloy cushion block to determine the required compressive strength; S3, designing the composition of the alloy cushion block; and S4, carrying out the industrial design of the alloy cushion block and starting smelting. Through reasonable alloy composition and production process design, the application provides a high-temperature heat-resistant alloy cushion block, improves the strength and melting point of the alloy cushion block, enables the alloy cushion block to maintain high strength at high temperature, solves the problem of FeO bonding in a molten state, reduces the phenomenon of heating furnace nodulation, and has universality and is suitable for various casting processes.

This invention relates to transition layer materials and welding processes for welding dissimilar steel and aluminum materials, belonging to the field of welding technology. The transition layer material for welding dissimilar steel and aluminum materials of this invention comprises a copper layer, a copper alloy layer, and a zinc alloy layer arranged sequentially; the copper layer is adjacent to the steel base material, and the zinc alloy layer is adjacent to the aluminum base material; the copper content in the copper alloy layer is 62.0%-64.0%; the zinc content in the zinc alloy layer is 89.0%-91.0%; the mass ratio of the copper layer, copper alloy layer, and zinc alloy layer is (0.9-1.1):(2.3-2.7):(1.8-2.2). By sequentially setting the copper layer, copper alloy layer, and zinc alloy layer between the steel base material and the aluminum base material, a gradual transition from the steel base material to the aluminum base material is achieved, effectively avoiding the formation of brittle Fe-Al intermetallic compounds during direct welding, and enhancing the mechanical properties and durability of the welded joint.

The application belongs to the technical field of adhesives and sealants, and specifically provides a sealing wax as well as a preparation method and application thereof. The sealing wax comprises the following components in parts by mass: microcrystalline wax 40-60 parts, polyethylene wax 1-5 parts, ethylene-vinyl acetate copolymer 3-8 parts, low-molecular-weight polyisobutylene 2-5 parts, medium-molecular-weight polyisobutylene 2-5 parts, tackifying resin 15-20 parts, and flame retardant 3-5 parts. The number-average molecular weight of the low-molecular-weight polyisobutylene is less than 5000, and the viscosity-average molecular weight of the medium-molecular-weight polyisobutylene is 10000-40000. Through the design and mutual compounding of the components, the sealing wax has a high melting point, a low water absorption rate, a high volume resistivity, good high-temperature and low-temperature resistance, and strong waterproof and moisture-proof performance, high mechanical strength and toughness, high insulation, high transparency, and strong sealing effect, and has good flow leveling property and good flame retardant performance, and can meet the strict use requirements of high-end electronic equipment.

The present application relates to the field of photovoltaic technology, and particularly relates to a solder strip preparation method, a solder strip and a solder strip preparation device. The solder strip preparation method comprises: stage-wise calendering a base material to form a first segment and a second segment on the base material, the first segment and the second segment being different in shape; wrapping a protective tape on the first segment; plating a tin-resistant metal coating on the second segment; removing the protective tape from the first segment, and plating a solder coating on the first segment, the melting point of the tin-resistant metal coating being greater than the melting point of the solder coating. The solder strip prepared by the solder strip preparation method does not have the phenomenon of tin accumulation at the bending part, avoids the contact between the solder strip and the film strip, avoids the micro-short circuit phenomenon of the photovoltaic module, and prolongs the service life.

The present application relates to a kind of polymerization device of high viscosity polymer, belong to polymerization reaction device technical field.The present application includes reaction main body, with reaction inner cavity, reaction inner cavity is equipped with even root for stirring high viscosity polymer's helical stirring shaft, helical stirring shaft includes main shaft and the helical blade connected in the outer side of main shaft, and the helical blade in each adjacent two helical stirring shafts is staggered with each other on the side of mutual approach;Main shaft is equipped with the heat-conducting medium passage that is penetrated from top to bottom, and the heat-conducting medium passage in each main shaft is connected by connecting short pipe to be connected to be the serpentine heat-conducting medium circulation total passage, one end of heat-conducting medium circulation total passage is heat-conducting medium inlet, and the other end is heat-conducting medium outlet, and heat-conducting medium inlet and heat-conducting medium outlet are located in the same end of the reaction main body;Reaction main body outer side is equipped with heating box, and heating box is used to heat heat-conducting medium, and heating box is located in the side close to heat-conducting medium inlet and heat-conducting medium outlet.

This invention provides a method for preparing a tungsten-titanium-aluminum alloy target. The method includes the following steps: ball milling tungsten powder, titanium powder, and aluminum powder under an inert atmosphere to obtain a mixed powder; adding the mixed powder in portions into a hot-pressing mold, performing hot-pressing sintering and post-treatment to obtain the tungsten-titanium-aluminum alloy target. The tungsten-titanium-aluminum alloy target provided by this invention is widely used in the field of high-performance thin film deposition as a diffusion barrier layer to prevent copper atoms from diffusing into the silicon substrate. Furthermore, due to its high thermal stability and low resistivity, it can also be used as a gate or contact electrode.

This invention relates to a horizontally cascaded phase change heat storage device, belonging to the field of phase change energy storage and enhanced heat transfer. It comprises an outer shell, a first inner cavity, a second inner cavity, an inner tube, a heat transfer fluid, a first phase change material, separating ribs, and a second phase change material. The invention utilizes separating ribs located at the lower part of the inner tube to divide the annular space between the outer shell and the inner tube into upper and lower chambers. The volume of the lower chamber increases from the inlet to the outlet. The first phase change material filled in the upper part of the first cavity has a higher melting point, while the phase change material filled in the lower part has a lower melting point. The combination of the separating ribs and different phase change materials reduces the heat storage time and improves the heat storage efficiency. Compared with traditional phase change heat exchangers, the heat storage time of this invention can be reduced by approximately 70%.

The application discloses a SAW resonator of an aluminum nitride-based heteroacoustic layer, and is used for improving resonator performance. The resonator comprises a heteroacoustic layer (HAL) structure, an input interdigital transducer (IDT), an output IDT, a first phononic crystal and a plurality of second phononic crystals. The HAL structure comprises a piezoelectric layer and a composite substrate, the piezoelectric material of the piezoelectric layer is scandium-doped aluminum nitride material. The input IDT and the output IDT are arranged on the piezoelectric layer respectively. The first phononic crystal is embedded into the piezoelectric layer and located between the input IDT and the output IDT, and is used for constructing a defect band through the first phononic crystal, so that the sound wave of the input IDT is propagated to the output IDT through the defect band. The input IDT comprises an input bus bar, and the output IDT comprises an output bus bar. The plurality of second phononic crystals are embedded into the piezoelectric layer respectively and located at two ends of the input bus bar and two ends of the output bus bar respectively, and are used for reflecting the sound wave through the second phononic crystals.

The application discloses a two-dimensional nitrogen-doped carbon material loaded rhenium-based alloy nanoparticle electrocatalyst, and a preparation method thereof. The preparation method comprises the following steps: dissolving a rhenium-based metal salt, a transition metal salt, a purine small molecule and an inorganic salt in water to perform a hydrothermal reaction, so as to obtain a two-dimensional structure precursor; and calcining the two-dimensional structure precursor under the protection of an inert gas, so as to obtain the electrocatalyst. The high-melting-point rhenium metal is used to form alloy nanoparticles with the transition metal, so that the defects of sintering of the transition metal-based catalyst in a high-temperature synthesis process can be effectively avoided, the aggregation and growth of the alloy nanoparticles in the high-temperature synthesis process are prevented, the alloy nanoparticles are uniformly and highly densely loaded on the surface of a two-dimensional carbon nitride carrier, the proportion of surface metal atoms is greatly increased, and finally, the prepared electrocatalyst has good hydrogen evolution reaction catalytic activity and catalytic stability.

The application discloses a rare earth slurry for grain boundary diffusion, a Nd-Fe-B diffusion magnet and a method. The rare earth slurry for grain boundary diffusion is prepared from raw materials including a rare earth powder, a heat-conducting powder, a binder and an organic solvent; wherein the rare earth elements in the rare earth powder include light rare earth and / or heavy rare earth; the heat-conducting powder is selected from one of aluminum nitride, silicon carbide and silicon nitride; the weight of the heat-conducting powder is 3-10% of the weight of the rare earth powder; and the particle size of the heat-conducting powder is 15-40 times of the particle size of the rare earth powder. The rare earth slurry for grain boundary diffusion can improve the diffusion effect of a subsequent magnet and the utilization rate of rare earth.