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150results about How to "Thermodynamically stable" patented technology

Method for acquiring highly-adaptive abrasion-proof titanium-based composite material on titanium alloy surface

The invention discloses a method for preparing a Ti-based composite with high adaptability on a Ti-alloy surface, which pertains to the field of surface modification of metallic materials. The method comprises such procedures as: weighing by certain proportion spherical Ti alloy powder particles in proper particle sizes (45-150 micro meter) and TiB2, Cr3C2, TiC or B4C powder particles (3.4-30vol%, particle size 38-106 micrometer); mixing the powder evenly by a mechanical way; sending at the set powder-feeding rate the mixed powder by a powder feeder and coaxial powder-feeding nozzles into a molten bath formed by a high-power laser at the surface of a Ti-alloy substrate; the mixed powder carrying out in-situ reaction by the high temperature from the molten bath, and forming such steady and dispersion reinforced phases as in-situ self-grown TiC or TiB. The reinforced phases are featured by small particle size, steady thermal and mechanical properties, free pollution in interfaces, and high bond strength with the substrate. The method can substantially improve the hardness and wear resistance of Ti alloy surfaces, guarantees the high adaptability between the surface modified layer and the substrate, can be used for repairing and surface reinforcing treatment of Ti alloy parts bearing impact vibration load and thermal fatigue, etc.
Owner:有研科技集团有限公司

Preparation method of core-shell structured Fe3O4@MCM-41 magnetic nano material

The invention provides a preparation method of a core-shell structured Fe3O4@MCM-41 magnetic nano material, and relates to a method for synthesizing Fe3O4 magnetic nano material from a vesicle phase. The preparation method of the core-shell structured Fe3O4@MCM-41 magnetic nano material aims to solve the problems of uneven core-shell structure and small specific surface area of the magnetic nano material. The preparation method comprises the following steps of: 1, preparing a vesicle phase solution from hexadecyl trimethyl ammonium bromide and sodium dodecyl benzene sulfonate; 2, dissolving FeCl3 and FeSO4 in secondary distilled water, and then adding the vesicle phase solution to the obtained iron salt solution, adding quadrol to adjust the pH value of the system after ultrasonic treatment to obtain a black suspension; and 3, adding hexadecyl trimethyl ammonium bromide and TEOS (Tetra Ethyl Ortho Silicate) to the black suspension, carrying out a crystallization reaction after pH adjustment, washing and drying the solid-phase crystals and then roasting the solid-phase crystals to obtain the magnetic nano material. The preparation method of the core-shell structured Fe3O4@MCM-41 magnetic nano material is characterized in that the vesicles formed by compounding an anionic surfactant with a cationic surfactant are taken as micro-reactors, the thermodynamic performance of the system is stable, and in the meantime, the specific surface area of the magnetic nano material is large.
Owner:QIQIHAR UNIVERSITY

Carboxyl separator of additive self-assembly layer of lithium-sulfur battery and preparation method of carboxyl separator

ActiveCN108172739AObvious repelling effectAchieve selective permeabilityCell seperators/membranes/diaphragms/spacersLi-accumulatorsCyclic processElectrochemical response
The invention relates to a carboxyl separator of an additive self-assembly layer of a lithium-sulfur battery. In the separator, a conventional battery separator is used as a substrate material by carboxylation, at least one blocking layer formed from the self-assembly layer is introduced to a surface of the substrate material, the self-assembly layer comprises constituents of sodium polystyrene sulfonate, polarized polyvinylidene fluoride or sodium carboxymethyl cellulose, carboxyl on the self-assembly layer and the separator has dual blocking effects on a polysulfide lithium intermediate bodyformed during the charge-discharge process of a sulfur positive electrode, and the stability of the separator can be further ensured by the self-assembly layer. Active substance sulfur in electrochemical reaction can be limited at one side of the positive electrode by the carboxyl separator of the additive self-assembly layer, the polysulfide lithium intermediate body formed during the circulation process of the sulfur positive electrode is prevented from being dissolved in an electrolyte to generate irreversible capacity attenuation, and the cycle property of the sulfur positive electrode isimproved. The invention also comprises a preparation method of the carboxyl separator of the additive self-assembly layer.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL

Extraction vanadium recovery process

The invention discloses an extraction vanadium recovery process. Spent vanadium catalysts are subjected to water leaching and reductive acid leaching treatment to obtain VOSO4-containing extracted raw liquid, the raw liquid is subjected to the single-stage extraction, tail liquid concentration, separate reextraction and back extraction vanadium recovery process, vanadium precipitation is carried out with ammonium hydroxide, and roasting is conducted to produce vanadium pentoxide. Saponified P204 is adopted as a main extraction agent, it is ensured that the pH value of the whole system is within the optimal pH value range in the extraction process, the extraction system can maintain a stable pH value, and the single-stage extraction rate of vanadium is greatly improved to above 96.4%; tetravalent vanadium obtained through extraction can be directly subjected to vanadium precipitation without oxidation, a high-purity vanadium product is produced, the technological process is simplified, and atmosphere pollution caused by chlorine generated by chlorate vanadium oxide is avoided; meanwhile, the selectivity characteristic of the saponified P204 is utilized, the influences of iron, phosphorus and arsenic on purity of extracted vanadium are effectively avoided, a part of impurity removal work is reduced, raw material consumption is reduced, enterprise cost is reduced, and economic benefits are remarkable.
Owner:KAIFENG UNIV

Spinel structure coated modified lithium cobalt oxide-based material, preparation method and lithium battery

The embodiment of the invention relates to a spinel structure coated modified lithium cobalt oxide-based material, a preparation method and a lithium battery. The spinel structure coated modified lithium cobalt oxide-based material comprises a lithium cobalt oxide-based positive electrode material body and a spinel structure coating layer, wherein the spinel structure coating layer comprises a co-doped transition coating layer which is constructed on the surface of the lithium cobalt oxide-based positive electrode material body and has a spinel structure coating material; the molecular formula of the spinel structure coating material is Li1 + x (MnaMb) O4-zFz, x is more than or equal to 0 and less than or equal to 1, z is more than 0 and less than or equal to 1, a is more than 0 and b is more than 0 and less than or equal to 1, and M is a + 2, + 3 or + 4 valence element for doping Mn site; in the co-doped transition coating layer, chemical bond combination exists between material elements of the spinel structure coating material and the lithium cobalt oxide-based positive electrode material body to form a co-doped structure, and in the co-doped transition coating layer, Mn and M elements are in gradient distribution; the spinel structure coating material accounts for 0.1%-10% of the mass of the lithium cobalt oxide-based positive electrode material body; and the average thickness of the co-doped transition coating layer is 2 nm to 100 nm.
Owner:INST OF PHYSICS - CHINESE ACAD OF SCI
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