499results about How to "High melting point" patented technology

The invention relates to a high-temperature-resistant nylon engineering plastic and a preparation method thereof, and belongs to the technical field of high polymer materials. The high-temperature-resistant nylon engineering plastic comprises the following components in parts by weight: 80-120 parts of nylon resin, 4-6 parts of inorganic filler, 4-6 parts of glass fiber, 2-10 parts of a heat-resistant modifier, 1-2 parts of a coupling agent, 1-3 parts of polyethylene wax, 0.5-1.5 parts of an antioxidant and 1-2 parts of a flame retardant, carbonyl and maleimide groups of the heat-resistant modifier strengthen intermolecular interaction and improve the glass transition temperature and the melting point, intermediate products 1 and 2 strengthen high temperature resistance, in addition, sulfonyl attracts electrons to strengthen thermal stability, tetrahydrofuran ring and acrylate are resistant to decomposition, and stability and water resistance are improved; boron and nitrogen of the flame retardant cooperate, a B-O-C carbon layer is formed at high temperature, flame-retardant gas is released, the flame-retardant property is remarkably improved, and the high-temperature-resistant nylon engineering plastic prepared by the preparation method has good high-temperature-resistant and water-resistant effects and also has excellent flame-retardant property.

The invention relates to a high-strength wear-resistant polyethylene gas pipeline and a preparation method thereof, and belongs to the technical field of high polymer materials. The high-density polyethylene, the modified ethylene propylene diene monomer, the modified chlorinated polyethylene rubber, the modified basalt fiber, the silicon carbide ceramic material, the magnesium oxide, the lubricant, the hindered amine light stabilizer, the hindered phenol antioxidant, the antistatic agent and the like are adopted as raw materials for compounding; and according to the material properties and dispersion characteristics of all the components, the process steps and parameters of mixing, banburying, extruding and the like are designed, so that the production of the pipeline can be well realized, and the gas pipeline with uniform quality and excellent performance is obtained. The compressive strength, the impact resistance and the wear resistance of the pipeline are greatly improved, the weather resistance of the pipeline is effectively improved, the service performance of the pipeline is comprehensively improved, the service life of the pipeline is comprehensively prolonged, and the pipeline is more suitable for being used in various severe environments, can meet the use requirements of long-distance construction, long-term friction and high-pressure environments and can be widely applied to high, medium and low-pressure gas conveying. Civil and industrial fuel gas conveying is achieved.

The embodiment of the invention discloses a ZrO2 doped CMA material preparation method and a structure and function integrated regulation and control method thereof. The method comprises the following steps: S1, mixing an aluminum oxide source, a calcium oxide source and a magnesium oxide source according to a set proportion to obtain a mixed source material, and adding an additive zirconium dioxide into the mixed raw material to obtain a raw material mixture; wherein the particle sizes of the alumina source, the calcium oxide source and the magnesium oxide source are equivalent, and the mass ratio of the zirconium dioxide to the mixed source material is not greater than 4wt%; s2, stirring and mixing the raw material mixture, and adding a water binder to obtain a uniformly mixed material; wherein the mass ratio of the water to the raw material mixture is 5-50%; s3, carrying out compression molding on the uniformly mixed material under the pressure of 80-120 MPa to obtain a green body; and S4, firing the green body in an air atmosphere at 1650-1750 DEG C to obtain the ZrO2 doped CMA material. The content of the C2M2A14 phase in the CMA material can be regulated and controlled between 80% and 100% by regulating and controlling the doping amount of ZrO2, the firing temperature and the heat preservation time.

The invention provides a metallized film for a capacitor, a preparation method of the metallized film and the capacitor, and relates to the technical field of capacitor manufacturing. The preparation method of the metallized film comprises the following steps: preparing an inorganic reinforcing material from raw materials including 1, 4-phthalaldehyde, zirconium diboride and tetraethoxysilane; the preparation method comprises the following steps: preparing a modified polypropylene material from raw materials including 4, 4 '-diaminobiphenyl, triphenyl phosphate, an ethylene-1-octylene copolymer, polyethylene and polypropylene; raw materials including polyvinyl alcohol, a silane coupling agent, N-hydroxynaphthalimide trifluoromethanesulfonic acid, an inorganic reinforcing material and a modified polypropylene material are subjected to melt mixing, casting piece forming and two-way stretching, and a base film is obtained; applying a polyester coating on the base film, and carrying out irradiation treatment on the base film by adopting an electron beam and an ultraviolet light source to obtain a modified base film; a metal layer is formed on the modified base film through vacuum evaporation, and the metallized film is obtained. The metallized film obtained by the invention has good thermal stability and mechanical properties.

The invention relates to an anti-yellowing automobile composite film and a preparation method thereof, and belongs to the technical field of high polymer materials. The yellow-resistant automobile composite film is prepared from the following components in parts by weight: 60 to 70 parts of PVC (Polyvinyl Chloride) master batch, 10 to 20 parts of TPU (Thermoplastic Polyurethane) master batch, 1 to 2 parts of plasticizer, 0.5 to 0.8 part of flatting agent, 0.1 to 2 parts of yellowing-resistant modifier and 0.1 to 2 parts of modified flame retardant, sym-triazine cyanuric chloride and a benzotriazole intermediate in the anti-yellowing modifier absorb ultraviolet rays and reduce yellowing of the ultraviolet rays on the composite material, and maleimide groups, maleic anhydride and isocyanurate rings for increasing the crosslinking density cooperate with one another, so that the heat resistance of the material is improved, and the yellowing is reduced; phosphorus and nitrogen main chains of phosphonitrilic chloride trimer in the modified flame retardant have a conjugation effect, so that a protective film is formed, oxygen is isolated, and the phosphonitrilic chloride trimer and nitrogen are synergistically flame-retardant; the anti-yellowing automobile composite film prepared by the invention not only has excellent ultraviolet absorption performance, heat resistance and anti-yellowing effects, but also has a good flame retardant effect.

The invention provides a polycrystalline diamond material with a double-peak structure and a preparation method of the polycrystalline diamond material, and relates to the technical field of superhard materials. The polycrystalline diamond material comprises the following raw materials: nano onion carbon and micron graphite, and the preparation method comprises the following steps: weighing the nano onion carbon and the micron graphite, carrying out mechanical grinding treatment, fully mixing to obtain mixed powder, pressing the mixed powder with a mold, and wrapping with boron nitride to obtain a green body; and the blank is loaded into a high-temperature and high-pressure synthesis cavity for high-temperature and high-pressure synthesis treatment, then heat preservation and pressure maintaining treatment is carried out, cooling and pressure relief treatment are carried out, and the polycrystalline diamond material with the double-peak structure is obtained. According to the method disclosed by the invention, the grain size with a'double-peak structure 'is constructed in the polycrystalline diamond, so that the fracture toughness of the polycrystalline diamond is improved by more than two times while high hardness is maintained, the extremely-hard and high-toughness polycrystalline diamond is successfully synthesized, and a reference is provided for toughening of other ceramic materials.

The invention provides a diamond / copper multi-layer composite material capable of being subjected to high-temperature silver-copper welding, a preparation method of the diamond / copper multi-layer composite material and a heat dissipation device comprising the diamond / copper multi-layer composite material capable of being subjected to high-temperature silver-copper welding. The diamond / copper multilayer composite material capable of being subjected to high-temperature silver-copper welding is of a sandwich structure, a middle layer is made of a diamond / copper composite material, and an upper layer and a lower layer are respectively made of any one of tungsten copper, molybdenum copper and copper / molybdenum copper / copper (CPC material). The surface of the diamond / copper multilayer composite material is covered with the metal alloy material, so that the diamond / copper multilayer composite material has remarkably improved strength and lower thermal expansion coefficient at high temperature, and can be welded with ceramic at high temperature, so that a silver-copper solder can be used for replacing a gold-tin solder, and the application cost of the diamond / copper multilayer composite material is reduced.

The invention relates to a flame-retardant rubber and plastic thermal insulation material and a preparation method thereof, and belongs to the technical field of high polymer materials. The flame-retardant rubber-plastic thermal insulation material comprises the following components in parts by weight: 50-75 parts of nitrile rubber, 20-45 parts of PVC resin, 10-15 parts of a plasticizer, 1-10 parts of a foaming agent, 1-5 parts of a foaming promoter, 10-40 parts of a composite flame retardant and 2-6 parts of a modified anti-aging agent, cyclohexanehexol phosphate in the composite flame retardant is heated and dehydrated into phosphoric acid, a barrier layer is formed to inhibit release of combustible materials, and dimethylallylamine combusts to absorb heat and cooperates with phosphorus-oxygen double bonds for flame retardance; a pre-product in the modified anti-aging agent reacts with a free radical of a rubber molecular chain, so that the heat resistance and the aging resistance of the material are improved, a maleimide group enhances an intermolecular acting force, the rigidity and the heat resistance of the molecular chain are improved, and material aging caused by high temperature is reduced; the flame-retardant rubber and plastic thermal insulation material prepared by the invention not only has an excellent anti-aging effect, but also has good flame retardance.

The invention relates to hydrolysis-resistant polyester polyol with high bio-based content, polyurethane resin for a synthetic leather surface layer and a preparation method of the hydrolysis-resistant polyester polyol. The hydrolysis-resistant polyester polyol with high bio-based content comprises the following raw materials: bio-based dihydric alcohol, bio-based dibasic acid, an antioxidant and a catalyst. In the hydrolysis-resistant polyester polyol with high bio-based content, provided by the invention, the bio-based dihydric alcohol not only comprises micromolecular bio-based 1, 3-propylene glycol, but also comprises low-carbon environment-friendly long-chain polypropylene carbonate dihydric alcohol with molecular weight of 1000, so that the crystallinity and hardness of the bio-based polyester polyol are reduced; the hydrolysis resistance and flexibility of the bio-based polyester polyol are improved, the hydrolysis resistance of polyurethane resin for a synthetic leather surface layer prepared from the hydrolysis-resistant polyester polyol with the high bio-based content is synchronously improved, and the stable dispersion performance of pigment is good.

The invention discloses a vanadium-based neutron transparent alloy material and a preparation method thereof, the alloy is a disordered solid solution of a body-centered cubic structure formed by a single crystal phase, the chemical composition is V < 1-x > Mx, x is less than 0.1, V is a metal element vanadium, and M is selected from one or more of Al, Nb, Ta, Fe, Sn or Mo. According to the alloy, neutron diffraction peaks generated by metal vanadium can be effectively eliminated while a metal vanadium body-centered cubic crystal structure is not damaged, the neutron transparent alloy material is successfully prepared, the process is simple and feasible, the formula has diversified choices, multiple novel double-element vanadium-based neutron transparent alloys are prepared, and the neutron transparent alloy material has good application prospects. In addition, the multi-element vanadium-based transparent neutron alloy is prepared for the first time, all the materials have excellent chemical and mechanical properties, and compared with an existing Ti2.08Zr alloy, the multi-element vanadium-based transparent neutron alloy has better high-temperature chemical stability.

The invention discloses a method for improving the strength and long-term service performance of a brazed joint in a skutterudite thermoelectric device by using a cobalt-based barrier layer, and belongs to the technical field of thermoelectric material connection. The problems that the long-term service performance of existing skutterudite and electrode brazing is poor, and the strength of a brazed joint is low are solved. The cobalt-based barrier layer added between the skutterudite and the electrode is cobalt and the refractory metal, and the refractory metal is high in melting point, bond energy and diffusion activation energy, so that diffusion of the Sb element through the barrier layer to the electrode is inhibited, and the components of the cobalt-based barrier layer can be flexibly adjusted, so that the thermal expansion coefficient of the barrier layer is easily matched with that of the skutterudite. The barrier layer powder and the skutterudite powder are subjected to integrated hot pressed sintering, and staggered interfaces are formed between the powder and the powder; and the interface stress can be well relieved. Due to the fact that the barrier layer contains fewer grain boundaries, diffusion of the Sb element can be better restrained. The shearing strength of the obtained brazed joint of skutterudite and the electrode reaches 33.6 MPa.

The preparation method comprises the following steps: preparing PET non-woven fabric raw paper, preparing a nano-zinc oxide particle dispersion liquid, dipping the PET non-woven fabric raw paper in a solution, carrying out heat treatment to form a functional PET non-woven fabric, preparing a functional alkenyl ionic liquid, carrying out heat treatment to form a PET non-woven fabric, and carrying out heat treatment to form the PET reinforced bi-crosslinked polyionic liquid composite solid electrolyte. Adding a cross-linking agent, a lithium salt, a plasticizer and a photoinitiator to prepare an electrolyte precursor solution; the functional PET non-woven fabric is placed in the electrolyte precursor solution, standing and dipping are carried out under the vacuum condition, then thermal polymerization and photopolymerization are carried out, and the solid electrolyte is prepared and applied to the solid polymer lithium ion battery; the zinc oxide particles are compounded into the PET non-woven fabric to form the non-woven fabric which is thin in thickness, high in tensile strength and appropriate in porosity, and the non-woven fabric is cross-linked with the functionalized alkenyl ionic liquid and the electrolyte precursor solution step by step, so that the ionic conductivity, the electrochemical window and the thermal stability of the solid electrolyte and the safety performance of the battery in use are improved.

The invention discloses a glabridin-nicotinamide eutectic crystal and a preparation method and application thereof, and belongs to the technical field of eutectic crystals, the eutectic crystal comprises nicotinamide and glabridin molecules, the molecular formula of nicotinamide-glabridin is C26H26N2O5, and the molar ratio of nicotinamide to glabridin is 1: 1. According to the invention, the cocrystal is used as a raw material, complete characterization is carried out on the cocrystal to prove that the cocrystal has certain physical and chemical stability, the stability of nicotinamide is improved after the cocrystal is prepared, and no irritant substance nicotinic acid is generated in cosmetics in a cocrystal stability experiment. And the eutectic crystal is generally neutral, mild, non-irritant, natural and suitable for cosmetics or health care products.

The invention belongs to the technical field of coating materials, and provides an anti-laser radiation coating composition and a coating preparation method, the coating composition comprises a heat insulation layer composition, a transverse heat dissipation layer composition and a reflection layer composition; wherein the heat insulation layer composition is prepared from the following components in parts by mass: 60 to 65 parts of film-forming resin, 17.5 to 20 parts of ceramic particles and 17.5 to 20 parts of ceramic hollow spheres; the transverse heat dissipation layer composition is prepared from the following components in parts by mass: 90 to 95 parts of film-forming resin and 5 to 10 parts of high-thermal-conductivity boride; the reflecting layer composition comprises the following components in parts by mass: 58-65 parts of film-forming resin, 30-39 parts of ceramic particles and 3-5 parts of chopped fibers.

The invention discloses high-crystallinity copolyester based on furandicarboxylic acid as well as a preparation method and application of the high-crystallinity copolyester. The structural formula of the high-crystallinity copolyester is as follows: # imgabs0 # R1 is-O (CH2) aO-, R2 is-O (CH2) bO-, a, b, x, y, z and n are integers, a = 2-6, b = 6-12, x = 1-10, y = 1-10, z = 1-10, and n = 20-100; and (x + z): y = 1: 1-1: 10. The present invention also provides a highly crystalline copolyester article made from the highly crystalline copolyester. The high-crystallinity copolyester disclosed by the invention not only has excellent crystallization capacity, relatively high crystallinity, excellent thermal stability and mechanical property, but also has excellent barrier property, and has obvious advantages in various gas barrier aspects compared with PET (Polyethylene Terephthalate) on the market; the material can be widely applied to the fields of high-temperature-resistant materials, express packages, food packages, food tableware and the like.

The invention discloses an antioxidant carbon aerogel material and a preparation method thereof. The method comprises the following steps: sequentially adding a solvent, a boron-containing modifier and a silicon-containing modifier into phenolic resin for esterification reaction; sequentially curing, drying and carbonizing to obtain boron-silicon modified carbon aerogel; depositing a SiC inner coating on the boron-silicon modified carbon aerogel under the assistance of supercritical CO2; a Zr-Si ceramic oxygen barrier layer and a SiO2 sealing and filling layer are sequentially prepared through a sol-gel method, and the carbon aerogel material with the SiC-Zr / Si-SiO2 composite coating is prepared. The invention also provides the aerogel material prepared by the method, the oxidation resistance of the aerogel material is obviously improved, and the aerogel material can be used for preparing a thermal insulation material applied to the field of high-temperature thermal protection.

The invention discloses a novel low-cost high-entropy ceramic coating with a composite structure. The novel low-cost high-entropy ceramic coating comprises a supporting layer, a transition layer and a functional layer which are sequentially deposited, wherein the supporting layer comprises a TiZrAlCrSi layer and a TiZrAlCrSiN layer which are sequentially deposited, the transition layer comprises a TiZrAlCrSiN layer and a TiZrAlCrSiMN layer which are periodically and alternately deposited, and the functional layer comprises a TiZrAlCrSiMN layer; the invention further discloses a preparation method of the novel low-cost composite-structure high-entropy ceramic coating. The preparation method comprises the processes of cleaning, ion implantation, deposition of the supporting layer, deposition of the transition layer and deposition of the functional layer. The invention further discloses application of the novel low-cost composite-structure high-entropy ceramic coating in a superhard tough high-temperature-resistant tool. The novel low-cost composite-structure high-entropy ceramic coating provided by the invention solves the problems of low high-temperature hardness, poor wear resistance, weaker cracking resistance and the like of the existing cutter coating.

The invention relates to the field of welding materials of austenitic stainless steel, in particular to a flux-cored wire based on concentrated nitric acid corrosion-resistant austenitic stainless steel and a preparation method, and aims to solve the problems that an existing welding material of the austenitic stainless steel is poor in concentrated nitric acid corrosion resistance, intergranular corrosion and stress corrosion cracking are prone to occurring in a concentrated nitric acid environment, and the welding quality is poor. Therefore, the service life and the safety of the equipment are influenced. According to the austenitic stainless steel flux-cored wire, by optimizing the chemical components and the preparation process, the corrosion resistance and the welding performance of the welding wire in a concentrated nitric acid environment are remarkably improved, the use requirements in a high-corrosion environment can be met, and a welded joint has high strength and toughness; the performance requirement of an engineering structure on a welding joint can be met; the austenitic stainless steel flux-cored wire is suitable for welding equipment, pipelines and structures in contact with concentrated nitric acid in the industries of chemical engineering, petrochemical engineering, pharmacy and the like, and has wide application prospects.

The invention discloses a preparation method of an electric furnace lining gunning material and a gunning device thereof, and the preparation method comprises the following steps: 1, uniformly mixing fly ash and titanium-containing powder, and heating to a first temperature to obtain an initial material; 2, the initial material is subjected to heat preservation at the first temperature for 1.5-2.5 h and then naturally cooled to the room temperature, and a first material is obtained; and step 3, crushing the first material and preparing the first material into slurry to form the gunning material. According to the preparation method of the electric furnace lining gunning material and the gunning device of the electric furnace lining gunning material, the fly ash and the titanium-containing powder react at a high temperature to obtain TiC, magnesium aluminate spinel and perovskite, the three high-melting-point solid-phase substances have the characteristics of high corrosion resistance, high viscosity and the like at the same time, the three high-melting-point solid-phase substances are gunned to the damaged part of the furnace lining, and the damage to the damaged part of the furnace lining is avoided. The direct contact between the slag and the furnace lining can be effectively prevented, and the further melting loss and scouring consumption speed of the slag to the furnace lining is reduced, so that the service life of the furnace lining is prolonged.

The invention provides a long-service-life magnesium-aluminum-carbon ladle wall brick for a steel ladle and a preparation method of the long-service-life magnesium-aluminum-carbon ladle wall brick. The long-service-life magnesium-aluminum-carbon ladle wall brick comprises the following raw materials in percentage by mass: 29%-63% of waste magnesium-aluminum-carbon bricks, 10%-20% of waste magnesium-carbon bricks, 10%-25% of fused magnesite, 2%-5% of white corundum, 3%-5% of alpha-alumina micro powder, 3% of liquid phenolic resin, 1%-3% of fused magnesite dust removal powder, 0.1%-3% of a CeSi2-SiC multiphase material and 1%-3% of high-temperature asphalt. And 1%-5% of graphite. The long-life magnesium-aluminum-carbon ladle wall brick prepared by the method has the advantages of favorable oxidation resistance, favorable molten steel scouring resistance, high thermal shock resistance, long service life and excellent use effect.

The utility model relates to the technical field of camouflage nets, in particular to a camouflage net which comprises a bottom net, the bottom net is of a latticed structure formed by longitudinally arranging multiple strands of metal ropes and transversely connecting the multiple strands of metal ropes through pressing buckles, every two adjacent rows of pressing buckles in the transverse direction are vertically arranged in a staggered mode, and the multiple strands of metal ropes are arranged in the latticed structure. A rope net is arranged on one side of the bottom net, camouflage cloth is arranged on one side of the rope net, and the peripheral edge parts of the bottom net, the rope net and the camouflage cloth are connected through lock catch assemblies, so that the bottom net, the rope net and the camouflage cloth are connected into a whole. The camouflage net is provided with a three-layer structure, so that the camouflage net is favorable for avoiding patrol of aircrafts such as unmanned aerial vehicles and the like, can block and protect attacks of self-destruction aircrafts, and can trigger fuses of armor-piercing bullets in advance, so that the armor-piercing bullets are far away from a strike point to be detonated, and the armor-piercing strike force on the strike point is reduced.

The invention relates to the technical field of casting powder, in particular to special casting powder for 2520 heat-resistant stainless steel and a preparation process of the casting powder. The high-temperature-resistant ceramic comprises the following components: 30-40 parts by weight of calcium oxide, 15-20 parts by weight of aluminum oxide, 8-12 parts by weight of zirconium oxide powder, 5-10 parts by weight of silicon dioxide, 10-15 parts by weight of manganese oxide, 3-5 parts by weight of titanium dioxide, 3-5 parts by weight of calcium fluoride, 8-10 parts by weight of a stabilizer and 3-5 parts by weight of rare earth element oxide. The zirconium oxide powder is prepared from zirconium chloride and yttrium nitrate through a coprecipitation method; the stabilizer is obtained by depositing aluminum oxide and silicon dioxide on the surface of magnesium oxide; the rare earth element oxide is a mixture of cerium oxide and lanthanum oxide. A layer of aluminum oxide and silicon dioxide composite coating is deposited on the surface of magnesium oxide, a layer of compact physical barrier is formed on the surface of magnesium oxide, erosion of harmful components in slag to magnesium oxide is effectively prevented, and the corrosion resistance of magnesium oxide is remarkably improved.

The invention discloses an alloy wear-resistant sliding block and a preparation and production process, and belongs to the technical field of alloy sliding blocks. A position hole is formed in an upper base body, and position grooves are formed in the periphery of the position hole. The included angle between the position holes and the vertical axis is 17-35 degrees, an L-shaped pressing block is installed on the outer side of the arc-shaped body, and a curve part and a bevel part are arranged in the side direction of the L-shaped pressing block; the end parts of the curve parts are welded on the longitudinal water beam; and an anti-bending strip is arranged in the multiple groups of curve parts and is welded with the L-shaped pressing block. The alloy comprises the following components in parts by weight: 2 to 3 parts of C, 10 to 15 parts of Fe, 3 to 5 parts of S , 2 to 3 parts of Al, 15 to 19 parts of Cr, 3 to 5 parts of T , 0.3 to 1.5 parts of Nb, 6 to 9 parts of Co, 0.1 to 0.2 part of P and the balance of N and trace residual impurities, wherein REC is set to be equal to (A < l > + S + T + Cr) / 3N + (Nb + T ) / 2 (N + Cr), and REC is larger than or equal to 0.16 and smaller than or equal to 0.31. The technical problems that longitudinal expansive force is generated in the heat-resistant sliding block due to heating, cracks are generated on the surface of the longitudinal water beam under the action of tensile force, and then breakage is caused are solved.

The invention discloses a modified CM square electric power corrugated pipe, belongs to the technical field of electric power pipe processing, and aims to solve the technical problem that the burnthrough resistance and the mechanical strength of a square electric power corrugated pipe in the prior art need to be further improved. The corrugated pipe comprises a square pipe and a plurality of corrugated rings arranged outside the square pipe, the square pipe and the corrugated rings are made of a modified CM material, siloxane-enhanced modified chlorinated polyethylene rubber and chlorinated polyvinyl chloride are combined to form a mixed matrix, and the mixed matrix is enhanced by using a composite filler composed of modified inorganic powder and modified glass beads. The tensile property and the impact resistance of the modified CM square electric power corrugated pipe are effectively enhanced, the burn-through resistance and the low temperature resistance of the material are improved, and the modified CM square electric power corrugated pipe is more convenient and more advantageous in practical application by optimizing the structure of the electric power corrugated pipe.

The invention belongs to the technical field of low-melting-point alloys, and provides a low-melting-point gallium-based liquid alloy and a preparation method and application thereof. The preparation raw materials of the gallium-based liquid alloy comprise gallium, indium, tin, zinc, bismuth, antimony, lead and rare earth metal with specific mass content. The rare earth metal comprises one or two of lanthanum, cerium and neodymium. A trace amount of one or two of lanthanum, cerium and neodymium is added into the gallium-based alloy, so that the purity of the alloy can be improved, the viscosity can be reduced, and the surface tension can be adjusted; by adjusting the formula of the alloy, the smelting time is shortened in the alloy smelting process stage, the efficiency is improved, the alloy cost is reduced, the alloy is more uniform macroscopically, the low-temperature stability of the alloy is further improved, and the alloy can be kept in a stable liquid state at the low temperature even 10 DEG C below zero and better meet the special climate requirements.

The invention discloses a double-phase reinforced titanium-based composite material and a preparation method thereof, and belongs to the technical field of titanium-based composite materials, the double-phase reinforced titanium-based composite material comprises 0.5-2.2 wt.% of Si, 1.4-2.1 wt.% of TiB2 and the balance of TC4 titanium alloy, and the sum of the weight percentages of the components is 100%; a TiB reinforced phase is distributed around a Ti phase in the double-phase reinforced titanium-based composite material structure to form a first-stage net-shaped structure; a Ti5Si3 reinforced phase is distributed in the beta-Ti phase, and the beta-Ti phase forms a secondary net-shaped structure around the alpha-Ti phase. The preparation method comprises the step that the Si powder, the TiB2 powder and the TC4 titanium alloy are smelted together. The double-phase reinforced titanium-based composite material is prepared through in-situ reaction, and meanwhile, the problem that the double-phase reinforced titanium-based composite material is low in preparation uniformity is solved through repeated smelting.

The invention discloses a high-titanium nickel niobium-based alloy and a preparation method thereof, the method comprises the following steps: step 1, niobium alloy powder is prepared and subjected to vacuum drying, the atom proportion of Nb powder in the niobium alloy powder is 60%-75%, the atom proportion of Ti powder in the niobium alloy powder is 15%-25%, the atom proportion of Ni powder in the niobium alloy powder is 6%-12.5%, and the balance is refractory metal element powder; 2, the niobium alloy powder is made into a high-titanium-nickel-niobium-based alloy blank through laser additive manufacturing equipment; and 3, the high-titanium-nickel-niobium-based alloy blank is put into a high-temperature furnace with the high vacuum degree, after the air pressure in the furnace reaches 1 * 10 <-3 > Pa to 5 * 10 <-3 > Pa through a mechanical pump and a diffusion pump, the temperature is increased to 1000-1200 DEG C from the room temperature at the temperature increasing rate of 10 DEG C / min, annealing is conducted for 1-10 h, and after furnace cooling is conducted, the high-titanium-nickel-niobium-based alloy is obtained and has the high melting point and the excellent mechanical property.

The invention discloses Ag-free high-temperature active alloy brazing filler metal and a preparation method and application thereof. The brazing filler metal alloy comprises 9.5-12.5 wt% of Ge, 9-11 wt% of Ti, 0.1-1.5 wt% of Ni and the balance Cu, the melting point of the brazing filler metal alloy ranges from 960 DEG C to 975 DEG C, and the recommended brazing temperature ranges from 1000 DEG C to 1100 DEG C. The product forms comprise foil strips, wires and powder paste. The preparation method comprises the steps of vacuum alloying, spherical gas atomization powder preparation, centrifugal ball milling powder mixing, spark plasma sintering, homogenizing heat treatment, isothermal rolling, isothermal rotary swaging and precise drawing. The alloy brazing filler metal is suitable for ceramic high-temperature direct packaging, diamond material device high-temperature brazing, refractory metal vacuum brazing and the like, high-strength weld joints can be obtained, the service temperature is high, the cost is low, and the problem that Ag element steam pollutes devices can be effectively solved.

The invention relates to the technical field of ceramic membranes, in particular to a ceramic sintering aid and application thereof. The ceramic sintering aid is prepared from, by weight, 2-4 parts of manganese dioxide and 4-8 parts of modified aluminum powder, the modified aluminum powder comprises aluminum particles, and the surfaces of the aluminum particles are wrapped with epoxy resin layers. The mass ratio of the aluminum particles to the epoxy resin is (2-3): 1. Based on the fact that low-valence manganese ions are not resistant to corrosion, the corrosion resistance of the manganese ion-containing ceramic is improved by wrapping the ceramic particles with the corrosion-resistant layer. Meanwhile, the melting point of aluminum oxide is extremely high, and a coating layer is very difficult to form, so that aluminum powder is coated with resin, ceramic is sintered in an inert gas atmosphere, the resin is gasified at a high temperature, and aluminum is molten to form a liquid phase to coat raw material particles; after cooling, the atmosphere is changed into an air atmosphere, so that the molten aluminum is oxidized to form a compact aluminum oxide layer, low-valence manganese oxide which is easily corroded by acid is isolated, and the high-compactness and corrosion-resistant performance of the ceramic is achieved.

The present invention belongs to the technical field of nickel-based alloy connection, and specifically relates to a brazing method for improving the high-temperature welding performance of nickel-based alloy joints and a prepared multi-layer welded joint. First, the brazing material is processed into an amorphous brazing foil, and then the amorphous brazing foil is pre-placed between the joint surfaces of the workpieces to be welded of the Inconel625 nickel-based alloy, and then the workpieces to be welded are fixed and placed in a vacuum brazing furnace for brazing. After the brazing is completed, the workpiece group is cooled to below 100°C and then solution treated in a vacuum brazing furnace. The amorphous foil-shaped brazing material used in the present invention has a small difference in melting point from the parent material, which is conducive to capillary action and can optimize the formation and performance of the brazed joint; the solution treatment can improve the distribution and morphology of brittle phases such as borides in the brazing seam. The present invention can be used as a special brazing method for multi-layer brazing joints or Inconel 625 nickel-based alloys, and has great application prospects.