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170results about How to "Low melting point" patented technology

Method for preparing compact ultrafine-grain boron carbide ceramic material with reduced sintering temperature

ActiveCN106854080ALow melting pointLower densification temperatureHigh entropy alloysEnergy consumption
The invention discloses a method for preparing a compact ultrafine-grain boron carbide ceramic material with a reduced sintering temperature. The method comprises the following steps: selecting coarse boron carbide powder with an average particle size of less than 20 [mu]m and carrying out ball milling and settlement so as to obtain ultrafine boron carbide powder with a particle size of less than 1 [mu]m; mixing the ultrafine boron carbide powder with MnNiCoCrFeX high-entropy alloy powder and carrying out ball milling so as to obtain B4C-MnNiCoCrFeX mixed powder; and subjecting the mixed powder to pressure sintering so as to obtain the compact ultrafine-grain boron carbide ceramic material with a reduced sintering temperature. According to the invention, the MnNiCoCrFeX high-entropy alloy powder is added into a boron carbide matrix, so a liquid phase is formed during high-temperature sintering and can fill in pores, and thus, the sintering densification temperature of the boron carbide ceramic material is effectively reduced, and energy consumption is decreased; and a boron carbide product with a density of greater than 99% is obtained after a temperature of 1900 DEG C is maintained for 5 min, and compared with the prior art, sintering temperature is reduced by 200 DEG C and heat preservation time is substantially shortened.
Owner:CENT SOUTH UNIV

Method for separating cynomorium songaricum polysaccharides through deep-eutectic solvent/salt two-aqueous-phase extraction

The invention discloses a method for separating cynomorium songaricum polysaccharides through deep-eutectic solvent/salt two-aqueous-phase extraction. The method comprises the following main steps: adding a deep-eutectic solvent with a certain moisture content into cynomorium songaricum powder, fully leaching at room temperature, performing ultrasonic pulse treatment under ice-bath conditions, andcentrifuging to collect the supernatant so as to obtain a crude cynomorium songaricum polysaccharide extract; adding dipotassium phosphate into the crude cynomorium songaricum polysaccharide extract,mixing, dissolving, standing and centrifuging to form a two-aqueous-phase extraction system, wherein the upper phase is the deep-eutectic solvent, and the lower phase is a solution containing sugar and dipotassium phosphate; performing freeze drying recovery on the upper phase; and dialyzing the lower phase, and performing freeze drying, thereby obtaining the cynomorium songaricum polysaccharide.The deep-eutectic solvent adopted in the invention has the advantages of being non-toxic, excellent in biodegradability and biocompatibility and low in melting point, the extraction, separation and purification operations are simple, the conditions are mild, the separation efficiency is high, the yield of the cynomorium songaricum polysaccharide is high, the deep-eutectic solvent can be recycled,the production cost is effectively reduced, and the method is suitable for large-scale industrial production.
Owner:NORTHWEST NORMAL UNIVERSITY

High-reliability low-temperature lead-free solder paste and preparation method thereof

The invention discloses a high-reliability low-temperature lead-free solder paste and a preparation method thereof. The high-reliability low-temperature lead-free solder paste is prepared by mixing solder powder and flux according to a weight ratio of 88.5-90.0:10-11.5. The solder powder is composed of, by weight, 48-56% of Sn, 1.0-1.4% of Ag, 0.1-0.15% of rare earth Ge/Nd and the balance In. In the selected raw materials, solder powder alloy is low in melting point, excellent in mechanical property and thermal fatigue resistance and capable of meeting high reliability in use of the solder paste in a low-temperature environment; the flux is low in boiling point and capable of meeting the requirement that other components of the flux are dissolved by a solvent in a soldering process, and the flux is basically volatilized to reduce after-soldering residues after soldering is finished; an active agent with a low melting point can guarantee greatest functions in the soldering process to realize removal of an oxide film of a substrate, reduction of surface tension of soldering flux and promotion of moistening of the solder paste and the substrate; a thixotropic agent can guarantee freeness of sedimentation and layering in a solder paste storage process and continuity and smoothness in a printing process.
Owner:广东中实金属有限公司

Lithium battery for inhibiting growth of lithium dendrites by utilizing liquid metal as well as preparation method and application thereof

InactiveCN110752375AUniform lithium metal depositionLow melting pointElectrode carriers/collectorsSecondary cellsMetallic lithiumLithium dendrite
The invention relates to the technical field of lithium ion batteries, and particularly relates to a lithium battery for inhibiting growth of lithium dendrites by utilizing liquid metal as well as a preparation method and application thereof. The method comprises the steps of coating a gallium-based liquid metal layer on a current collector, taking the current collector as a positive electrode, and assembling the current collector and components required by the lithium battery into a liquid battery in an inert atmosphere so as to obtain the lithium battery. According to the invention, the lithium affinity of the current collector is improved by using the low-temperature gallium-based liquid metal coating, the initial nucleation potential barrier of lithium is reduced, the growth of lithiumdendrites is finally eliminated, uniform metal lithium deposition is realized, the coulombic efficiency of the battery is remarkably improved, the SEI film is stabilized, the cycle life of the battery is prolonged, and the occurrence of safety problems induced by the lithium dendrites are reduced. According to the method, the preparation of the current collector can be completed through the simple liquid metal coating, and the large-scale production is greatly facilitated.
Owner:SHANDONG UNIV

Preparation method for high-strength wear-resistant alloy Cu-15Ni-8Sn

ActiveCN105886807AAvoid melt getteringLow melting pointElectric furnacesNitrogen gas
The invention discloses a preparation method for a high-strength wear-resistant alloy Cu-15Ni-8Sn. The process comprises the following steps: adding electrolytic copper and nickel; pouring the electrolytic copper and nickel in an intermediate-frequency coreless induction furnace; adding charcoal; charging nitrogen gas with one barometric pressure; melting; melting for 30-65 minutes at 1300-1350 DEG C; adding tin and melting at 1250-1300 DEG C; adding a refiner and a deoxidizer; stirring; adding a grain refiner; adding a modifier; slagging off; carrying out inspection before melting; carrying out electromagnetic casting after ingredients are qualified; cutting a head and a tail; scalping; carrying out ingredient inspection after melting; carrying out organization structure analysis; and carrying out performance detection. A Cu-15Ni-8SnC72900 alloy melt and cast by virtue of the intermediate-frequency coreless induction furnace, which is obtained by the preparation method disclosed by the invention, is low in production cost; and the developed products are high in quality. The developed products can be applied to national defense and military industry, ocean engineering and high-end preparation manufacturing industry; and the increasingly urgent needs of the national defense and military industry, ocean engineering and high-end preparation manufacturing industry on high-performance copper alloy materials are met.
Owner:JINCHUAN GROUP LIMITED

Anisotropic heat conduction material, and preparation method thereof

The invention discloses an anisotropic heat conduction material. The anisotropic heat conduction material is a composite material of liquid metal materials and a high-molecular polymer, wherein the high-molecular polymer possesses embedded runners, and the runners are filled with the liquid metal materials. According to the preparation method, the anisotropic heat conduction material is obtained via injecting and sealing room temperature liquid metals, including gallium, indium, mercury, sodium, potassium, caesium, or binary alloys and multicomponent alloys thereof, into the high-molecular polymer; anisotropism of heat conductivity of a composite material prepared via adding high thermal conductivity materials into a base material is increased greatly; and heat energy transmission direction can be controlled artificially based on practical requirements. Preparation is convenient; mixing process and mixing results of the high thermal conductivity additives with the high-molecular polymer can be controlled easily; material heat conductivity anisotropy rate range can be adjusted in a relatively range artificially; and the anisotropic heat conduction material possesses significant importance in the fields of micro-fluidic chips, biological medical testing equipment, cryogenic engineering, and electronic integration equipment.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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