Patents
Literature
Patsnap Eureka AI that helps you search prior art, draft patents, and assess FTO risks, powered by patent and scientific literature data.

949 results about "Melting point" patented technology

The melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at a standard pressure such as 1 atmosphere or 100 kPa.

High-strength silver-free copper-based brazing filler metal

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.
Owner:ANHUI HUAZHONG WELDING MATERIAL CO LTD

Diffusion source for neodymium-iron-boron magnet as well as preparation method and application of diffusion source

The invention relates to a diffusion source for a neodymium-iron-boron magnet and a preparation method and application of the diffusion source. The invention discloses a rare-earth metal catalyst which comprises the following components in percentage by mass: 46%-49% of an organic solvent, 0.1%-2% of an adhesive, 0.1%-5% of a metal oxide and 46%-49% of rare-earth metal, and the melting point of the metal oxide is higher than that of the neodymium-iron-boron magnet. The specific organic solvent, the adhesive, the metal oxide and the rare earth metal are matched for use according to a specific matching relation, so that the diffusion source is more stable, the diffusion effect is improved, and when the magnet attached with the diffusion source is subjected to thermal diffusion treatment, the rare earth metal can be diffused into the magnet so as to improve the coercive force and other properties of the magnet. In the process, the high-melting-point metal oxide is adhered to the surface of the magnet and then serves as a spacer, the adhesion phenomenon of the magnet in the high-temperature sintering diffusion process is reduced or avoided, grain boundary diffusion is further promoted, and the performance of the magnet is improved.
Owner:HUNAN RARE EARTH NEW ENERGY MATERIALS CO LTD

Efficient film bag feeding control system and method

The invention relates to the field of co-extrusion production control, and particularly discloses an efficient film bag feeding control system, which is applied to a multi-raw-material synchronous conveying device of a co-extrusion process, and comprises a full-link data acquisition module, a full-link data processing module and a full-link data processing module, the raw material characteristic parameters comprise a melting point T, a stacking density rho and a magnetic sensitive particle loading amount M; the instantaneous load pressure P of each raw material conveying channel, the temperature Tm of a co-extrusion die head melting area, the real-time thickness H of a co-extrusion film layer, stock bin liquid level data and motor rotating speed data are collected and integrated to obtain a full-link original data set; the single-drive linkage conveying mechanism comprises a main servo motor, a plurality of sets of electromagnetic clutches and a plurality of sets of spiral conveying assemblies, and the main servo motor drives a transmission shaft through a synchronous belt. According to the technical scheme, for the co-extrusion process, the multi-raw-material synchronous conveying precision can be matched, and the problems that parameter adjustment lags behind, adaptability is poor and a downstream process feedback closed loop is lacked are solved.
Owner:CHANGXING JIANGMEI PACK CO LTD

Crystallization process of o-chloro-p-nitroaniline

The invention discloses a crystallization process of o-chloro-p-nitroaniline, which comprises the following steps: feeding a material into a crystallization kettle to crystallize the o-chloro-p-nitroaniline, regulating and controlling the temperature in the kettle body in the crystallization process, cooling to a metastable region of the o-chloro-p-nitroaniline, preserving the heat in the metastable region for a first preset time length, and then cooling to a second preset time length; continuously cooling to a first temperature lower than the melting point of the o-chloro-p-nitroaniline, keeping the temperature at the first temperature for a second preset duration, continuously cooling to a second temperature, and outputting the material out of the crystallization kettle for filtration and separation; in the cooling process, the cooling speed in the kettle body is controlled to be 0.1-0.2 DEG C / min. According to the invention, the interior of the kettle body can be slowly cooled, and the cooling speed of each part in the kettle body can be more uniform, so that the crystallization purity and the product quality of o-chloro-p-nitroaniline are finally improved.
Owner:WUJIANG TONGLUO AUXILIARY PLANT

Preparation method of high-strength, high-hardness and ablation-resistant CuWTaTeAl gradient nano composite material

The invention discloses a preparation method of a high-strength, high-hardness and ablation-resistant CuWTaTeAl gradient nano composite material. The method comprises the following steps: 1, mechanically mixing Cu80Al20 spherical coated powder, Cu90W10 spherical coated powder, WTe2 alloy powder, Ta powder and Cu powder, and then carrying out ball milling and mixing; 2, performing SPS (spark plasma sintering); thirdly, after soaking treatment, multi-pass hot rolling deformation is carried out, and then quenching treatment is carried out; and 4, annealing heat treatment. The binary spherical coating powder, the alloy powder and the elementary substance powder are subjected to ball milling and mixing to achieve uniform distribution of all elements, high-melting-point W and Ta are added to improve the ablation-resistant temperature of the composite material, large-scale copper dendrite powder is added to form gradient distribution nanocrystals, the proportion of all the elements is controlled, the lattice distortion degree is increased, and the ablation-resistant temperature of the composite material is improved. The high-strength, high-hardness and ablation-resistant CuWTaTeAl gradient nano composite material is suitable for the fields of contacts, switches, electrical connectors, resistance welding electrodes and the like.
Owner:NORTHWEST INSTITUTE FOR NONFERROUS METAL RESEARCH

One-time sintering repairing method for reactive sintering silicon carbide material defects

The invention relates to the technical field of ceramic material repairing, in particular to a one-time sintering repairing method for reactive sintering silicon carbide material defects. Comprising the following steps: measuring the defect size of reactive sintering silicon carbide, and cutting a silicon-based alloy block slightly larger than the defect size; carrying out ultrasonic cleaning on the defect part of the reactive sintering silicon carbide by adopting an organic solvent, wherein the ultrasonic time is 20-40 minutes; placing the silicon-aluminum alloy block above the defect of the reactive sintering silicon carbide, and uniformly paving silicon powder on the surface of the reactive sintering silicon carbide; the mass fraction of the silicon powder is 3-8% of that of the reactive sintering silicon carbide; setting a proper sintering temperature, heating according to a heating rate of 3-10 DEG C / min, and keeping the temperature for 1-3 hours after the sintering temperature is reached; the sintering temperature is higher than the melting point of the silicon-based alloy; and polishing the surface of the repaired reactive sintering silicon carbide to obtain the repaired reactive sintering silicon carbide. The method has the advantages that low-porosity and high-density repair of the crack area is guaranteed, and the optical performance of the reflector is not reduced.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI

Foundry COKE products, and associated systems, devices, and methods

A coke product configured to be used in foundry cupolas to melt iron and produce cast iron products is disclosed herein. In some embodiments, the coke product has a Coke Reactivity Index (CRI) of at least 30% and an ash fusion temperature (A FT) less than 1316° C. Additionally or alternatively, the coke product can comprise a fixed carbon content of at least 80% and / or a volatile matter content of no more than 1.0%.
Owner:SUNCOKE TECH & DEV LLC

Nitro binary fused salt and preparation method thereof

The invention relates to the technical field of molten salt, in particular to nitro binary molten salt and a preparation method thereof. The preparation method comprises the following steps: mixing sodium carbonate and a potassium hydroxide solution, and then adding a starch-based grafted crystal inhibitor to inhibit crystallization; adding a nitric acid aqueous solution in two stages, and introducing eutectic seed crystals to guide nucleation at the end of the first stage; crystal distribution is optimized through falling film evaporation and concentration and setting of partial reflux; and after spraying granulation, carrying out short-time melting reforming and controlled cooling in an inert atmosphere. According to the method, the composition uniformity and the structural stability of the molten salt are remarkably improved, so that the product has a melting point close to a theoretical eutectic point, low supercooling degree, high melting latent heat and excellent thermal cycling stability and corrosion resistance, and is suitable for an industrial heat storage system running for a long time.
Owner:SHANXI WOJIN NEW MATERIAL CO LTD

Method and device for growing crystal

In a first step S101, the raw material is directly induction heated using a high-frequency induction heating coil (103) while cooling the outer periphery of a raw material (151) to or below the melting point of the raw material by a cooling mechanism (102) to form a raw material melt (152) (raw material melting step). In a second step S102, a seed crystal (161) is brought into contact with the melt (seeding step). In a third step S103, a crystal (153) is grown from the seed crystal (crystal growth step). In the third step S103, the high-frequency induction heating coil and the seed crystal are gradually separated from each other while maintaining the relative distance between the high-frequency induction heating coil and the outer periphery of the raw material, and the crystal is grown in the melt.
Owner:C&A CORP +1

Rapid repairing material for tapping hole and furnace lining of intermediate frequency furnace

The invention relates to the field of furnace lining materials, in particular to a rapid repairing material for a tapping hole and a furnace lining of an intermediate frequency furnace. The rapid repairing material comprises the following components in parts by weight: 50-70 parts of tabular corundum, 10-20 parts of fused magnesite, 8-15 parts of alumina micro powder, 3-8 parts of nano zirconia, 5-12 parts of silicon carbide, 10-15 parts of silica sol and 2-5 parts of a reinforcing agent. Wherein the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride. The tabular corundum is mainly used as an integral framework; the fused magnesite is matched with the alumina micro powder to form magnesium aluminate spinel with a high melting point; the nano zirconium oxide can fill pores and is excellent in toughness; the silicon carbide has the advantages of high hardness, high thermal conductivity and high melting point; the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride, although the adding amount is small, the high-temperature strength, toughness and thermal shock resistance of the repairing material can be remarkably improved, and especially the long-term corrosion resistance can be remarkably improved.
Owner:JIANGSU JIANGNENG NEW MATERIAL TECH

Multi-material plastic plate extrusion molding device

The invention discloses a multi-material plastic plate extrusion molding device which comprises a plurality of double-screw extruders, the output ends of the double-screw extruders are communicated with a conveying pipe, and the end, away from the double-screw extruders, of the conveying pipe is communicated with a conveying shell. The invention relates to the technical field of plastic plate production equipment, through cooperation of the double-screw extruder, the conveying pipe, the conveying shell, the mixing and conveying assembly and the extrusion shaping assembly, extrusion shaping of multi-material plastic plates is achieved, targeted temperature and rotating speed setting can be conducted according to the characteristics of different raw materials, and the production efficiency is improved. Different raw materials are mixed in an optimal molten state, the problems of layering, uneven mixing and the like caused by large differences of melting points and flowability in the mixing process of the different materials are avoided, the overall stability and reliability of the plastic plate are improved, the requirements of the market for the multi-material composite plastic plate are met, and the market prospect is wide. The large-scale application of the plastic plate in more fields is promoted.
Owner:SHANGHAI JOBBETTER PLASTIC MASCH CO

Thermal fatigue resistant ceramic and production process thereof

ActiveCN120441294AThermal fatigueKaolin clay
The invention relates to thermal fatigue resistant ceramic and a production process thereof, and belongs to the technical field of ceramic material preparation, the thermal fatigue resistant ceramic comprises the following raw materials by mass: 90-100 parts of a base material, 5-10 parts of a flexibilizer, 1-3 parts of a sintering aid and 1-3 parts of an additive; wherein the base material is obtained by mixing calcium carbonate, talc, aluminum oxide, kaolin and a nano zirconium oxide precursor according to the mass ratio of (0.75-1.25): (2-3): (80-85): (3-4): (3-4). The base material in the thermal fatigue-resistant ceramic selects the aluminum oxide as a main component, and the aluminum oxide has extremely high melting point and hardness and excellent chemical stability, so that the ceramic can keep stable physical and chemical properties in a high-temperature environment, and the thermal fatigue resistance of the ceramic is remarkably enhanced.
Owner:JIANGXI GRAPE RICE CERAMICS CO LTD

Low-temperature separation and enrichment system and method for elements in multi-element complex metallurgical material

PendingCN120366576AMetalReaction chamber
According to the low-temperature separation and enrichment system and method for the elements in the multi-element complex metallurgical material, the multi-element complex metallurgical material is pretreated to form powder with a certain particle size, the powder is mixed with pulverized coal and subjected to a reduction reaction with hydrogen in a reaction chamber, meanwhile, different valuable metal elements are separated and enriched through the difference between melting points and boiling points, and the elements in the multi-element complex metallurgical material are separated and enriched. The method not only realizes efficient separation and recovery of elements such as iron, lead, zinc, potassium and sodium in the multi-element complex metallurgical material, but also solves the problems of high energy consumption, low reduction rate and the like in the reduction process of the multi-element complex metallurgical material, and has the advantages of short flow, less equipment, safety in operation, economy, high efficiency and easiness in industrial large-scale production.
Owner:CHANGLI XINGGUO PRECISION PARTS CO LTD +2

Method for preparing transdermal microneedle based on gallium-based liquid metal

The invention discloses a method for preparing a transdermal microneedle based on gallium-based liquid metal, which comprises the following steps: (1) heating the gallium-based liquid metal at a temperature higher than the melting point of the liquid metal, so that the gallium-based liquid metal is completely molten into a liquid state; (2) sucking the liquid metal preheated in the step (1) by using a microsyringe or a pipettor, and quickly injecting the liquid metal into a microneedle mold, so that the liquid metal is spread and completely covers a cavity of a needle tip in the mold; (3) transferring the mold in the step (2) into a constant-temperature vacuum box, and decompressing and degassing under vacuum; in the degassing process, the degassing temperature enables the liquid metal to be kept in a flowing liquid state all the time, and vacuumizing is conducted till the pressure is not higher than 10 Pa; the degassing time is not less than 5 hours; (4) continuously injecting the preheated gallium-based liquid metal or a degradable polymer solution into the mold to form a substrate of the microneedle; and (5) transferring the mold in the step (4) to a temperature far lower than the melting point of the liquid metal, and freezing and forming to obtain the transdermal microneedle.
Owner:SOUTHEAST UNIV

Antioxidant and application thereof in steel ladle slag line brick

The invention relates to the technical field of refractory materials, in particular to an antioxidant and application thereof in steel ladle slag line bricks, and the antioxidant comprises a Si / SiC multiphase material, modified nano Al2O3 and CaF2; the ladle slag line brick comprises an antioxidant, fused magnesite, crystalline flake graphite and phenolic resin. Si-SiC compound waste is subjected to magnetic separation and acid pickling, then a SiO2 passivation layer is formed through pre-oxidation, moisture and air in the storage period are isolated, and a titanate coupling agent is introduced to improve the wettability and compatibility with phenolic resin. P2O5 released by phosphate on the surface of the modified nano Al2O3 at a high temperature reacts with alkali (earth) metal migrated to a SiO2 oxide layer to prevent the alkali (earth) metal from forming a low-melting-point eutectic substance, CaF2 reacts with SiO2 along with temperature rise, a passivation layer is broken, internal Si and SiC are directly exposed, and boron oxide of the modified nano Al2O3 remarkably reduces activation energy and a temperature threshold value of the reaction of CaF2 and SiO2.
Owner:ZHONGMIN CHIYUAN IND

Ethylene copolymers with improved melting and glass transition temperature

The present inventions concerns a copolymer of ethylene and an C3 to C8 alpha-olefin, wherein the copolymer has a density of 870 to 890 kg / m3 measured according to ISO 1183, a MFR2 of 0.5 to 8.0 g / 10 min measured according to ISO 1133, wherein the alpha-olefin is present in the copolymer in an amount of 20 to 35 wt.-%, wherein the copolymer has a first melting temperature Tm1 measured according to ISO 11357-3, characterized in that the first melt point Tm1 is between 90 and 115° C.
Owner:BOREALIS GMBH

Rare earth alloying inoculant

ActiveCN120228255AFoundryRare-earth element
The invention relates to the technical field of casting materials, and particularly discloses a rare earth alloying nucleating agent. According to the rare earth alloying nucleating agent, rare earth elements are added on the basis of a traditional silicon-based nucleating agent, the rare earth elements can react with S, O and N in molten iron to generate rare earth sulfide, oxide and nitride particles, and the particles can serve as nucleation substrates of graphite. The melting point of the particles is higher than the temperature of molten iron, so that the nucleation number of rare earth inoculation is large, the anti-recession time is long, the inoculation effect can be ensured, graphite is finer, and the strength of a casting is improved.
Owner:NANJING PUJIANG ALLOY MATERIALS CO LTD

Polypropylene Composite Material Having Melting Point Gradient Structure, Preparation Method Therefor and System and Use Thereof

A composite material includes a plurality of polypropylene sheet layer unit groups that are sequentially stacked; each polypropylene sheet layer unit group comprises at least one of the same or different polypropylene sheet layer units, the structure of each polypropylene sheet layer unit is BiAiB′i; the structure of the polypropylene composite material is . . . i-th group, . . . second group, first group, second group, . . . i-th group, . . . ; the melting point of polypropylene composition Ai is greater than the melting point of polypropylene compositions Bi and B′i; and the average value of the melting points of all outer layers in the i-th group is greater than the average value of the melting points of all outer layers in an (i-1)th group. The polypropylene composite material has a very good tensile property and very good impact resistance, and also has good interlayer stripping strength at a relatively low hot-pressing temperature.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1

Production process and equipment of spherical wax micro powder

The invention relates to the technical field of high polymer materials, and particularly discloses a production process of spherical wax micropowder, which comprises the following steps: melting solid wax into a wax melt, and preserving at a constant temperature in an environment which is at least 20 DEG C higher than the melting point of the wax; the wax melt and hot water are mixed according to the flow ratio of 1: (10-20) and then sprayed out to form mist spray, the mist spray enters mist spray pool water with the temperature of the wax melting point + / -5 DEG C, and wax liquid drops in the mist spray are subjected to condensation polymerization in the mist spray pool water to form spherical wax melt; the spherical wax melt gradually rises into cooling water flow in the water of the spraying pool, the temperature of the cooling water flow is 10-20 DEG C lower than the wax melting point, the spherical wax melt flows in the cooling water flow and is cooled, the spherical wax melt is separated from the cooling water flow, and dewatering and drying are conducted to obtain the spherical wax micro powder. The process can improve the sphericity and particle size uniformity of the wax micro powder.
Owner:NANJING TIANSHI NEW MATERIAL TECHNOLOGIES CO LTD

Silicon-manganese alloy smelting method

The invention relates to the technical field of metallurgy and chemical industry, in particular to a silicon-manganese alloy smelting method which comprises the following steps of raw material pretreatment, gradient reduction smelting, tapping and refining and flue gas slag cooperative treatment. In the silicon-manganese alloy smelting process, lanthanum-cerium oxide in the rare earth composite material reacts with impurities such as sulfur, phosphorus and oxygen in a melt at high temperature to form a high-melting-point compound which is separated along with slag, the impurity content is effectively reduced, meanwhile, rare earth elements are segregated at the grain boundary, atomic diffusion migration is inhibited, the alloy grain size is remarkably refined, and the alloy yield is improved. And the rare earth composite material optimizes the alloy solidification structure through the double effects of chemical purification and physical modification, the problems of impurity segregation and insufficient toughness in the traditional silicon-manganese alloy smelting process are solved, and the mechanical property of the silicon-manganese alloy is remarkably improved.
Owner:FUGU COUNTY YUANDA ACTIVATED CARBON CO LTD

Hot-melt adhesive composition

To provide a hot-melt adhesive composition which exhibits a low reactivation temperature, and superior thermal resistance and workability.SOLUTION: The hot-melt adhesive composition comprises: polyolefin component A with a melting point of 120 to 150°C and a melting enthalpy of 60 to 100 J / g; polyolefin component B having a melting point of 80 to 120°C and a melting enthalpy of less than 60 J / g, polymerized by a single-site catalyst; and tackifying resin component C having a softening point in the range of 130 to 150°C.SELECTED DRAWING: None
Owner:ASAHI CHEM SYNTHETIC

Preparation method of composite pipe, composite pipe and processing device of composite pipe

ActiveCN120243856ARigid pipesLiquid metalPipe
The invention provides a preparation method of a composite pipe, the composite pipe and a processing device of the composite pipe, relates to the technical field of composite pipes, and aims to solve the problem that in the prior art, a bimetal composite pipe only has compressive strength and cannot give consideration to vibration reduction and sound absorption performance, so that the application range of the bimetal composite pipe is small. The preparation method of the composite pipe comprises the steps that the metal pipe, the hollow balls and the metal base material are provided; the melting point of the metal tube and the melting point of the hollow ball are both larger than that of the metal base material. Melting the metal substrate to obtain a liquid metal substrate; the liquid metal base material and the hollow ball are injected into the rotating metal pipe through centrifugal casting, so that the liquid metal base material and the hollow ball are located on the inner wall of the metal pipe, and a composite structure with the hollow ball is obtained; and the composite structure with the hollow balls is cooled, so that the liquid metal base material is solidified, and the composite pipe with the hollow balls is obtained.
Owner:TAIYUAN UNIVERSITY OF TECHNOLOGY

Process method for regulating and controlling melting point and viscosity of aluminum deoxidized steel refining slag based on rare earth cerium

The invention discloses a technological method for regulating and controlling the melting point and viscosity of aluminum deoxidized steel refining slag based on rare earth cerium, and belongs to the technical field of ferrous metallurgy refining. The redox characteristic of Ce and slag system structure modification are combined, the limitation of traditional single component adjustment is broken through, and the composite oxide effect of Ce is utilized: Ce generates CeO2 and Ce-Al-O composite oxide at high temperature, so that the liquidus temperature of a slag system is remarkably reduced, and the melt structure is optimized; by limiting the addition amount of Ce and balancing the cost and performance, the situation that the oxidability of a slag system is out of control due to excessive Ce is avoided, and the thermodynamic stability of the slag system is improved; the addition of Ce inhibits the generation of high-melting-point calcium aluminate and promotes the formation of a low-melting-point phase; by adding Ce, melting point reduction, viscosity optimization and molten steel purification are achieved at the same time, the additive is superior to an existing single-function additive, traditional fluorite is replaced, and fluorine pollution is reduced. The invention aims to provide the same environment-friendly and efficient method capable of accurately regulating and controlling the physicochemical properties of the slag.
Owner:BAOTOU IRON & STEEL (GROUP) CO LTD

A method of manufacturing a stiffener material

The present invention provides a method of manufacturing a stiffener material comprising: providing an uncompressed felt layer comprising a primary fibrous material having a density of between 0.08 g / cm3 and 0.16 g / cm3; passing the felt layer through a double belt press; wherein as the felt layer is passed through the double belt press it is maintained under constant pressure whilst first being heated to within 20° C. of a melting point of the primary fibrous material and is subsequently cooled to below the glass temperature of the primary fibrous material to form a compressed material. A stiffener material manufactured according to the method of the present invention is also provided.
Owner:TEXON MANAGEMENT LTD

Micron-scale high-melting-point oxide sheet layer enhanced ultra-high-temperature ceramic-based anti-ablation composite coating and preparation method thereof

The invention provides a micron-scale high-melting-point oxide sheet layer enhanced ultra-high-temperature ceramic-based anti-ablation composite coating and a preparation method thereof.The preparation method comprises the steps that ultra-high-temperature carbide / boride ceramic powder, silicide powder and high-melting-point metal oxide powder are mechanically mixed, and spraying mixed powder with uniform components is obtained; the mixed powder is sprayed on the surface of a base body in a plasma spraying mode, and the ultra-high-temperature ceramic-based anti-ablation composite coating containing a micron-scale oxide lamellar structure is obtained; the lamellar high-melting-point oxide phase is introduced into the ultrahigh-temperature ceramic-based composite silicide coating, so that the problem that the silicon-containing glass phase is easy to lose and splash under high-heat-flow scouring is effectively solved. The high-melting-point oxide sheet layer serves as a physical barrier, can effectively limit flowing of a silicon-containing glass liquid phase in the ablation process and allows gaseous oxidation products to escape at the same time, so that a firmly-attached composite oxide layer is formed, and the oxidation resistance and the anti-scouring and anti-stripping capacity of the coating are greatly improved.
Owner:XI AN JIAOTONG UNIV

Preparation method of free-cutting lead brass alloy

According to the preparation method of the free-cutting lead brass alloy, trace elements such as tellurium, cobalt, samarium and selenium are added into lead brass, the tellurium, the selenium and the like can easily form low-melting-point compounds with other elements, grain growth can be inhibited, dispersed distribution of fine lead particles is promoted, stress concentration is reduced, and the cutting performance is improved; by adding cobalt, samarium and the like, grain refinement is facilitated, distribution and forms of selenium, tellurium and other elements are changed, alloy fluidity is promoted, dispersed distribution of lead and the like is promoted to be more uniform, the cutting performance is further improved, in addition, dissolution of lead can be inhibited through the passive film layer, the environment-friendly performance is improved, and harm caused by dissolution of lead is reduced.
Owner:NINGBO XINGAODA ADVANCED METALLIC MATERIALS

Refining impurity cleaning and removing process for secondary copper

The invention discloses a refining impurity cleaning and removing process for secondary copper, which comprises the following steps: (a) pretreatment melting: melting a secondary copper raw material to form copper liquid, and controlling the temperature to be 1150-1250 DEG C; (b) oxidizing and slagging: introducing oxygen-containing gas into the copper liquid for 20-40 minutes to oxidize impurity elements to form scum; according to the refining impurity cleaning and removing process for the secondary copper, As and Sn are converted into high-valence oxides through oxidation, then a low-melting-point borate slag system is formed through borax in the composite flux, and efficient trapping of impurities is achieved. The mass transfer process is enhanced, flux agglomeration is avoided, and the impurity removal rate is increased by 30% or above. The borax / calcium fluoride combination significantly reduces the melting point of the slag system (actually measured lt; and the lead and tin removal efficiency is improved.
Owner:ANHUI CHUJIANG HIGH TECH ELECTRIC WIRE CO LTD

Rare earth synergetic deoxidized nickel-based alloy welding wire and preparation method and application thereof

The invention discloses a rare earth synergetic deoxidation nickel-based alloy welding wire and a preparation method and application thereof, and relates to the technical field of high-temperature alloy welding materials, and the rare earth synergetic deoxidation nickel-based alloy welding wire can accurately control the oxygen content of a molten pool and reduce the defects of pores and inclusions by means of dual-mode synergetic deoxidation of Y2O3 and CeO2 and complementation of steady-state and dynamic deoxidation characteristics on the deoxidation mechanism, so that the deoxidation performance of the welding wire is improved. Trace Ca and Mg participate in deoxidation in the form of Ni coated powder, Ca reacts with sulfur and phosphorus impurities to generate a high-melting-point compound which floats upwards to be removed, Mg gasifies and stirs a molten pool to promote element diffusion, a composite purification system is formed, in the design of the three-layer structure of the flux core, deep deoxidation is conducted on the inner layer, impurity purification is conducted on the middle layer, and component optimization is conducted on the outer layer, so that gradient metallurgical reaction is achieved; the problem that the mixing reaction efficiency of a single-layer flux core is low is solved, and the welding reliability and the comprehensive performance of the nickel-based alloy welding wire are comprehensively improved.
Owner:WUXI WEISHI POWER TECHNOLOGY CO LTD

Novel desulfurization process in vacuum induction melting process

The invention discloses a novel desulfurization process in a vacuum induction melting process. According to the technical scheme, the method comprises the steps that an alloy material is dissolved and clarified, after the pressure of a furnace chamber is smaller than 10 Pa, the temperature of molten steel is increased to 60-150 DEG C above the alloy melting point for refining, and sampling is conducted every 10-30 min in the refining process till the content of oxygen and nitrogen in the molten steel is smaller than 20 ppm; then, the temperature of the molten steel is maintained to be 60-80 DEG C above the alloy melting point, after a furnace chamber is filled with argon to 10000 Pa, 0.5-5% of a Ca element additive is added into the molten steel, and the high binding force of the Ca element and the S element is utilized; the invention has the following beneficial effects: the desulfurization characteristics of Ca element and rare earth element are used; the sulfur element in the molten steel is removed in the mode that Ca is firstly used for desulfurization and then rare earth elements are used for desulfurization, and the content of the S element in the molten steel can be reduced to 10 ppm or below.
Owner:XIAN JUNENG SUPERALLOY MATERIAL TECH CO LTD +2

Preparation method and application of Co-Ni-C-based high-temperature alloy material

The invention discloses a preparation method and application of a Co-Ni-C-based high-temperature alloy material. The preparation method comprises the following steps that S1, raw materials are prepared according to the proportion; s2, the other raw materials except TiC, Co and Ni are sequentially placed in a smelting furnace from high melting point to low melting point to be smelted, the raw materials with the low melting point are placed at the bottom, TiC is placed at the bottoms of all the raw materials, and Co and Ni are placed at the topmost part; smelting to obtain an alloy ingot; s3, the obtained alloy cast ingot is ground and polished, and an oxide layer is removed; and S4, the alloy ingot is packaged in a quartz tube for heat treatment. According to the preparation method of the Co-Ni-C-based high-temperature alloy material, the mechanical property and the high-temperature oxidation resistance of the Co-Al-V system high-temperature alloy are improved, the hardness of the alloy can be improved by increasing the C element, the strength of the alloy can be improved by the Laves phase dispersed and distributed at the grain boundary after the alloy is subjected to solid solution aging treatment, the structure of the alloy is refined by the C element, and the mechanical property of the Co-Ni-C-based high-temperature alloy material is improved. And the mechanical property is improved.
Owner:XIANGTAN UNIV