26results about How to "Low melting point" patented technology

The invention discloses a high-strength silver-free copper-based brazing filler metal which is composed of P, Sn, Ni and Cu. The high-strength silver-free copper-based brazing filler metal is low in cost, safe, environmentally friendly and good in welding effect; through the adding of Sn and Ni, the melting point of brazing filler metal alloy is reduced, and the tensile strength and wettability of the brazing filler metal alloy are enhanced.

This invention discloses a refractory high-entropy alloy resistant to high-temperature molten aluminum corrosion and erosion-wear, its preparation method, and its applications. The refractory high-entropy alloy of this invention comprises, by atomic percentage: 40-50 at.% Nb, 35-40 at.% Ti, 4-10 at.% Mo, 4.5-5 at.% Cr, and no more than 10 at.% Al. This invention obtains the refractory high-entropy alloy by mixing and melting the raw materials under a protective atmosphere. The refractory high-entropy alloy ingot of this invention has a single-phase BCC microstructure, exhibiting stable structure, good mechanical properties, and excellent resistance to molten aluminum corrosion and erosion-wear. The Nb-Ti-Mo-Cr based refractory high-entropy alloy resistant to molten aluminum corrosion and erosion-wear prepared using this invention can significantly improve the service life of components, reduce replacement frequency, and has high economic benefits.

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.

This invention belongs to the field of aluminum alloy materials technology, and relates to a high-strength and ductile aluminum alloy and its preparation method. The alloy comprises, by mass fraction: 2-6% Mg, 0.4-0.9% Mn, 0.2-0.6% Si, 0.05-0.15% Sn, Fe≤0.15%, Ti≤0.1%, with the balance being Al. By introducing Sn, a low-melting-point MgSiSn primary phase is formed in the as-cast stage, and transforms from a continuous network to a discontinuous granular structure during homogenization heat treatment, weakening the adverse effects of brittle intermetallic compounds at grain boundaries. Simultaneously, Sn dissolved in the aluminum matrix forms a nanoscale MgSiSn precipitate during homogenization, serving as a heterogeneous nucleation core for the Mn-containing second phase, lowering its nucleation energy barrier, and promoting high-density, fine, and uniform precipitation, thereby achieving a synergistic improvement in the alloy's strength and ductility.

This invention provides a collector for recovering platinum group metals (PGMs) from spent catalysts, its preparation method, and its application, belonging to the technical field of precious metal recovery. The collector comprises a copper matrix, a flux, a framework support, and a lattice activator: the copper matrix, flux, and lattice activator are loaded on the surface of the framework support; the copper matrix is ​​elemental copper or a copper-based compound; the flux is boric acid or a borate; the framework support is a porous inorganic material; and the lattice activator is tin, a tin alloy, or a metal sulfide. The collector serves as a collector for the pyrometallurgical recovery of PGMs from spent catalysts. This invention constructs a multi-component synergistic collector composed of a copper matrix, flux, framework support, and lattice activator, which significantly improves the recovery rate of PGMs, especially rhodium, from spent automotive exhaust purification catalysts in pyrometallurgical treatment, and reduces the smelting temperature required for pyrometallurgical treatment, thus significantly reducing energy consumption.

The application discloses a kind of PEI or PEEK-based 3D printing wave-absorbing materials and preparation method thereof.The 3D printing wave-absorbing material includes the following components by mass fraction: polyetherimide resin or polyether ether ketone resin: 45~65 parts;Electromagnetic wave absorber: 10~50 parts;Impact modifier: 4~12 parts;Flow aid: 2~8 parts;Antioxidant: 0.5~3 parts;Wherein, the electromagnetic wave absorber includes magnetic absorber and carbon-based absorber, the impact modifier and the carbon-based absorber are pre-coated to form the carbon-based absorber coated with the impact modifier on the surface, and the magnetic absorber is surface modified by silane coupling agent.The application significantly improves the mechanical properties and thermal stability of the material by using specific raw material composition and combining specific multi-layer co-extrusion and online heat treatment process.The preparation process is simple and easy to operate, and is suitable for industrial continuous production.

This invention discloses a high-nickel ternary cathode material, its preparation method, and a lithium battery, relating to the field of lithium battery technology. A coating layer is formed on a high-nickel ternary cathode material substrate using fluorinated liquid crystal molecules. These fluorinated liquid crystal molecules have a lower melting point, making it easier to form an ideal coating layer compared to traditional coating agents. Furthermore, the liquid crystal molecules exhibit better solvent and electrolyte corrosion resistance, significantly improving the high-temperature cycling performance of the cathode material.

The application discloses a preparation method of a titanium carbide doped polymer solid electrolyte, which can effectively reduce the crystallinity of PEO, enhance the ionic conductivity of the polymer solid electrolyte and widen the electrochemical window by grafting PCL (polycaprolactone) on the surface of a two-dimensional material titanium carbide (MXene) and blending the PCL with a PEO (polyethylene oxide) blend.The steps adopted by the application are as follows: firstly, PCL is grafted on the surface of MXene through a one-pot method; then, the grafted material is mixed with PEO and LiTFSI (lithium bis(trifluoromethanesulfonyl)imide) in a certain proportion, is subjected to ultrasonic oscillation and is uniformly mixed by heating; finally, the solution is poured on a glass culture medium, the solvent is volatilized at room temperature, the solvent is removed by heating, and a solid polymer electrolyte film is obtained.The polymer solid electrolyte film prepared by the method of the application has good mechanical properties, high ionic conductivity, a wide electrochemical stability window, stable charge and discharge processes of an assembled battery and excellent cycle performance.

This invention relates to the field of knife manufacturing technology and discloses a method for preparing a knife with antibacterial effects, comprising the following steps: smelting a nitrogen-containing antibacterial martensitic stainless steel blade blank; heating, cooling, and tempering the nitrogen-containing antibacterial martensitic stainless steel blade blank to obtain the blade; hot isostatic pressing of a pure titanium ingot to obtain a densified titanium metal handle; and connecting the blade to the densified titanium metal handle using a tin-silver-based brazing filler metal at 680°C to 750°C via induction heating. This invention solves the problems of decreased hardness and corrosion resistance caused by silver precipitation through the synergistic effect of nitrogen and silver, utilizing nitrogen solid solution strengthening and potential compensation mechanisms; and employs a low-temperature tin-containing brazing process to construct a physical barrier layer, blocking carbon diffusion to the titanium side and the formation of brittle phases, thus avoiding over-tempering softening of the blade substrate, resulting in a knife with high hardness, corrosion resistance, long-lasting antibacterial properties, and high connection strength.

The application belongs to the technical field of organic electroluminescence, and discloses a compound, a composition containing the compound and a light-emitting device thereof. The compound has a structure shown in the following formula (1) or formula (2): formula (1); formula (2); wherein Y is selected from O or S; X1-X5 are each independently selected from CR0 or N. The compound has a suitable HOMO energy level, is beneficial to the injection of holes, can reduce the accumulation of holes at the interface of a light-emitting layer when the compound is used as a host material of an organic electroluminescence device, thereby significantly reducing the driving voltage of the device, balancing the transport of holes and electrons, and being beneficial to improving the light-emitting efficiency and service life of the device.

The invention discloses a flexible PET-based copolyester and a preparation method thereof, and relates to the technical field of high polymer materials, and the flexible PET-based copolyester is prepared from dibasic acid and dihydric alcohol through esterification and condensation polymerization; the binary acid comprises aliphatic flexible binary acid and terephthalic acid; the dihydric alcohol comprises ethylene glycol and flexible dihydric alcohol; the flexible dihydric alcohol comprises diethylene glycol and polyethylene glycol; the feeding amount of the diethylene glycol accounts for 1.0%-5.0% of the total molar weight of the dihydric alcohol; the feeding amount of the polyethylene glycol accounts for 3.0%-8.0% of the total molar weight of the dihydric alcohol. The copolyester has the advantages of high flexibility and low melting point.

This invention relates to the field of tin alloy solder technology and discloses a lead-free multi-element alloy solder, a tin material. The tin material is formed by pouring molten liquid metal into the interior of a mold assembly and cooling it. The composition of the tin material includes tin, silver, copper, bismuth, antimony, and nickel. The weight ratio of the composition of the tin material is: tin: 92-93 parts; silver: 2-3.5 parts; copper: 0.46-0.54 parts; bismuth: 1-2 parts; antimony: 2.5-3 parts; nickel: 0.05-0.1 parts. This invention uses a first scraper that moves on the top of the mold body to scrape off oxides and impurities on the surface of the liquid metal. When the first scraper moves to one side of the fixed frame, it moves to the side of the second scraper. Then the first scraper moves upward, and the second scraper can scrape off the oxides and impurities on the first scraper, avoiding secondary pollution. This allows for the cyclical scraping of oxides and impurities on the surface of the liquid metal, improving the aesthetics of the tin material and the overall quality of the soldering.

This invention relates to the field of polyurethane adhesive technology, specifically to a thermoplastic polyurethane resin for bonding water-repellent fabrics, its preparation method, and its application. It is prepared from the following raw materials: polyol, isocyanate, blocked isocyanate, chain extender, bonding accelerator, water-repellent synergist, and catalyst; the bonding accelerator is a compound of γ-aminopropyltriethoxysilane and tetrabutyl titanate; the water-repellent synergist is epoxy-terminated polydimethylsiloxane. This invention, through optimized formulation, solves the technical problems of insufficient bonding strength and poor resistance to damp heat aging of existing polyurethane resins for water-repellent fabrics, while also considering the synergistic effect of resin processing fluidity and water-repellent performance. It is suitable for composite processing of water-repellent fabrics in high-frequency use scenarios and has broad industrial application prospects.

This invention discloses a low-melting-point molten salt energy storage material and its preparation method, belonging to the technical field of physical heat transfer energy storage materials. This method involves introducing modified silicon carbide nanowires and modified sheet-like zinc-aluminum flakes as functional fillers generated through a mercapto-olefin click reaction to composite modify a ternary nitrate molten salt. Compared to the unmodified basic molten salt system, the prepared low-melting-point molten salt energy storage material achieves comprehensive improvements in thermal performance, corrosion resistance, cycle stability, and physical structural stability. Its melting point is approximately 81-93℃, which is lower than that of SolarSalt. Compared to existing mixed molten salts, its melting point is lower to varying degrees, significantly reducing the overall system cost, improving system safety and stability, achieving a wider operating temperature range, and increasing power generation efficiency.

This invention belongs to the field of batteries, specifically relating to an electrolyte and battery for improving the ultra-low temperature performance of lithium iron phosphate batteries. By adding specific film-forming additives and ultra-low temperature functional additives to the electrolyte, the low-temperature liquid state is maintained through the synergistic effect of fluoroethylene carbonate (FEC), 1-ethyl-3-methylimidazolium difluorophosphate, and 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, thereby reducing the electrolyte viscosity. At the same time, it can form a weakly solvated sheath layer with lithium ions, significantly reducing the energy barrier required for lithium ions to desolvate at the negative electrode interface, reducing the SEI interface impedance, thereby promoting lithium ion transport and significantly improving the ultra-low temperature performance of lithium iron phosphate batteries.

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 utility model discloses a kind of adhesive paper, battery cell and battery, wherein adhesive paper includes: base layer and adhesive layer.Adhesive layer is connected to the surface of base layer, the first bonding surface of the surface of adhesive layer away from base layer, adhesive layer has bonding groove, bonding groove extends to first bonding surface along the thickness direction of adhesive paper, and first opening is formed in first bonding surface, bonding groove has with the first inner wall towards first opening, and with the second inner wall and the second bonding surface intersect, define first inner wall as second bonding surface.Second inner wall is third bonding surface;Wherein, first bonding surface is used to bond with current collector, bonding groove is used for pole ear to extend into, and the surface of pole ear is respectively bonded with second bonding surface and third bonding surface. Thus, not only can adhesive paper better with current collector fit, and adhesive paper can be bonded with the side of pole ear, increase the bonding area of adhesive paper, so that adhesive paper is more firmly bonded on current collector and pole ear, to improve the safety of battery.

This invention relates to the field of polymer materials, and discloses a modified polyether ester, its preparation method and application, an elastomer additive, and an elastomer. The modified polyether ester contains structural unit A as shown in formula (I) and structural unit B as shown in formula (II), where R1 is an alkylene group having 2-10 carbon atoms, m is an integer from 5-100, n is an integer from 10-125, and R2 is hydrogen or an alkyl group having 1-5 carbon atoms; the terminal carboxyl group content of the modified polyether ester is not higher than 5 mol / t. This modified polyether ester can efficiently load elastomer additives, resulting in high activity stability of the elastomer additives, thereby improving the modification effect of the elastomer additives on the elastomer, and enabling the multiple reuse of elastomer products. Formula (I), Formula (II).

This invention discloses a method for preparing in-situ reinforced polyethylene with low-melting-point liquid crystal polyarylate, including the composition and co-spinning of the low-melting-point liquid crystal polyarylate. By introducing long-chain flexible monomers to design the molecular structure of the liquid crystal polyarylate, the melting temperature of the synthesized low-melting-point liquid crystal polyarylate is matched with the stretching temperature of polyethylene. After melt-blending the low-melting-point liquid crystal polyarylate with polyethylene and then spinning, during the subsequent hot stretching process, the low-melting-point liquid crystal polyarylate and the polyethylene matrix deform in coordination and form a reinforcing microfiber structure in situ. This invention effectively improves the interfacial compatibility between the liquid crystal polymer and polyethylene, and significantly enhances the processing flowability and mechanical properties of the composite material.

The application provides a high-temperature brazing filler metal for silicon carbide-based ceramic connection and a preparation method and application thereof, and belongs to the technical field of silicon carbide ceramic materials. The high-temperature brazing filler metal for silicon carbide-based ceramic connection provided by the application comprises 2-15% of metal powder and the balance of Ti-Si powder in percentage by mass, wherein the metal powder comprises Fe powder, Al powder, Ni powder, Cr powder or Co powder. A small amount of metal elements is added in the Ti-Si brazing filler metal, so that the melting point of the brazing filler metal is reduced, the connection time is shortened, and the liquid brazing filler metal is promoted to generate the Ti3SiC2 MAX phase with high strength by in-situ reaction with the silicon carbide-based ceramic to connect the base material; meanwhile, the brazing filler metal is in a liquid state at high temperature, so that the densification of the weld is achieved without using pressure, and the mechanical properties of the connected parts at room temperature and high temperature are improved.

The application relates to the technical field of preparation of rare earth alloy sputtering targets, in particular to a terbium-based alloy target and a preparation method thereof. The terbium-based alloy target is prepared by introducing specific amounts of Cu, Al, Ce and Ga elements on the basis of Tb, and through the mutual synergistic effect among the elements, a Tb-Cu-Al-Ga-Ce alloy target with low oxygen content, fine grains, dense and uniform structure and good processing performance is obtained; further, the alloy target can improve the sputtering film forming quality, can improve the heavy rare earth utilization rate and reduce the production cost when used for grain boundary diffusion of a neodymium-iron-boron magnet, can provide a basis for realizing the synergistic promotion of coercivity and remanence, and is suitable for large-scale industrial production in high-end application fields such as new energy vehicles and energy-saving home appliances.

This invention relates to a method for preparing thermotropic liquid crystal polymers, in which multiple catalysts are added in combination to the polymerization system of thermotropic liquid crystal polyarylates, which greatly accelerates the polymerization reaction rate and obtains a polymer product with high storage modulus, strong mechanical properties and low dielectric constant.

The invention discloses a diffused neodymium-iron-boron magnet, an alloy, diffusion slurry and application. The alloy consists of the following components in atomic percent: 30-50% of heavy rare earth element HRE, 20-40% of light rare earth element LRE, 5-15% of transition metal element T 'and the balance of low-melting-point metal element M, wherein HRE is selected from one or more of Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y; lRE is selected from one or more of La, Ce, Pr, Nd, Sm and Eu; t'comprises Co; m is selected from one or more of Cu, Al and Ga. The application of the alloy to the diffused neodymium-iron-boron magnet comprises the following steps that the alloy is smashed into alloy powder; mixing the alloy powder with a binder and a solvent to prepare diffusion slurry; a neodymium iron boron magnet is coated with the diffusion slurry; and carrying out diffusion heat treatment on the coated neodymium-iron-boron magnet.

The application provides a method for preparing an intermediate alloy for high-temperature alloy by a carbon reduction method. The method comprises the following steps: determining planned amounts of metal oxide raw materials according to weight percentages of each component of a target intermediate alloy to be prepared; selecting metal oxide powders with low contents of various impurity elements, screening all the powders, weighing and preparing for mixing; weighing a predetermined amount of carbon as a reducing agent; mixing the weighed metal oxide powders of different types with the carbon reducing agent to obtain mixed powders; compressing the mixed powders; drying the compressed block; placing the dried block into a vacuum sintering furnace for heating; and finally obtaining a binary or ternary intermediate alloy for high-temperature alloy.

This invention discloses a low-melting-point, high-barrier semi-aromatic polyamide copolymer, prepared by adding an antioxidant stabilizer and a nucleating agent to the following raw materials in parts by weight: 39-45 parts aromatic diamine, 10-32 parts adipic acid, and 23-51 parts long-chain aliphatic dicarboxylic acid; the antioxidant stabilizer and nucleating agent are added at 0.1-1% and 0.0001-0.1% of the total weight of the above raw materials, respectively; this invention also further discloses a method for preparing the copolymer. Compared with the prior art, the low-melting-point, high-barrier semi-aromatic polyamide copolymer provided by this invention has good mechanical properties and barrier properties, good flowability, and excellent processing performance. It can be added to low-melting-point polymers with a processing window of 140-190℃ to improve barrier properties, or it can be used alone as a barrier material.

The application provides a method for connecting titanium aluminum carbide and niobium by adopting a titanium intermediate layer and a connected joint, and relates to the technical field of welding. The method comprises the following steps: S1, preparing a component to be connected; the component to be connected is formed by sequentially stacking titanium aluminum carbide base material, an intermediate layer and niobium base material from top to bottom, and the material of the intermediate layer is titanium; S2, performing discharge plasma sintering on the component to be connected under a preset air pressure to obtain a connected joint. By adopting the method, the cracking of the joint can be inhibited, the decarburization or Al evaporation of Ti3AlC2 at high temperature can be inhibited, thereby the deterioration of the base material is inhibited; the generation of brittle intermetallic compounds can be avoided, which is helpful to improve the interface bonding strength, thereby the strength of the connected joint is improved.