425 results about "Solid phase reactions" patented technology

The invention discloses a negative temperature coefficient medium-entropy thermistor material as well as a preparation method and application thereof. According to the invention, manganese dioxide, nickel oxide, cobalt sesquioxide, zinc oxide and copper oxide are used as raw materials, and a solid-phase reaction method is adopted to prepare the negative temperature coefficient medium-entropy thermistor material with a chemical formula of (NiX1CoX2ZnX3CuX4) Mn2O4. Wherein the values of X1, X2, X3 and X4 are 0.075-0.425, and X1 + X2 + X3 + X4 = 1. The negative temperature coefficient medium-entropy thermistor material is of a single spinel structure. The material has the hysteresis diffusion effect of medium-entropy ceramic, and by combining the coordinated optimization effect of multiple components, the material constant and the resistivity of the thermal sensitive ceramic can be remarkably reduced, and the anti-aging performance can be improved.

The invention relates to the technical field of new energy, in particular to a nickel-free lithium-rich manganese-based positive electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a precursor: mixing a lithium source, a sodium source and a manganese source according to a stoichiometric ratio of a chemical formula # imgabs0 #, grinding, and calcining in an oxidizing atmosphere to form a P3 type layered precursor; (2) ion exchange: mixing the P3 type layered precursor obtained in the step (1) with a lithium salt, and carrying out sodium-lithium ion exchange through a solid-phase reaction to form a sodium-deficient intermediate; and (3) annealing treatment: carrying out heat treatment on the material subjected to ion exchange to obtain the lithium-rich manganese-based positive electrode material with the O3 type layered structure. According to the invention, only substances composed of three elements of Li, Mn and O are used for synthesizing the positive electrode material, so that the use of materials containing cobalt and nickel is avoided.

The invention discloses a method for preparing an adsorbent from clay minerals and carbide slag, and belongs to the technical field of deep processing of natural nonmetallic minerals and preparation of heavy metal adsorption functional materials. According to the method, natural clay and carbide slag serve as raw materials, the composite adsorption material containing various metal active sites is prepared through a solid-phase reaction, and the composite adsorption material is suitable for efficient removal of high-concentration and low-concentration heavy metal ions. The raw materials are cheap and easy to obtain, the preparation process is simple and efficient, and the product has excellent performance, wide application and wide prospects.

The invention discloses a composite heavy metal adsorbent synthesized through mineral conversion and a preparation method of the composite heavy metal adsorbent, and belongs to the technical field of deep processing of natural nonmetallic minerals and preparation of heavy metal adsorption functional materials, and the main preparation method comprises the following steps: S1, crushing and crushing natural clay minerals, and sieving with a 80-mesh sieve to obtain mineral powder; s2, mixing the obtained mineral powder with a calcium compound, and carrying out ball milling; s3, adding a boron compound, and continuing ball milling; s4, adding water into a solid material obtained by ball milling according to a solid-to-liquid ratio of (1: 5)-(1: 20), putting into a microwave hydrothermal reaction kettle, adding an organic auxiliary agent, carrying out gradient heating to 100-200 DEG C, reacting for 30-120 minutes, then naturally cooling to room temperature, separating, drying and crushing; according to the invention, natural clay raw ore is taken as a raw material, and the borate-silicate composite adsorption material is prepared in a preparation mode of combining solid-phase reaction and microwave hydrothermal treatment, so that high-concentration and low-concentration heavy metal ions are efficiently removed.

The invention discloses a (TiCrMoNbTa) C-series high-entropy ceramic and a preparation method thereof, and belongs to the technical field of high-entropy ceramic material preparation, the (TiCrMoNbTa) C-series high-entropy ceramic is a ceramic with a single-phase face-centered cubic structure, and the raw materials comprise Ti, TiC, Mo2C, TaC, NbC and Cr3C2; the preparation method comprises the following steps: S1, uniformly mixing five kinds of carbide raw material powder to obtain mixed powder A; s2, the mixed powder A and metal Ti are evenly mixed according to the proportion, and mixed powder B is obtained; and S3, putting the mixed powder B into a graphite mold with good heat-conducting property, and carrying out solid-phase reaction sintering to obtain the (TiCrMoNbTa) C-series high-entropy ceramic. The non-stoichiometric ratio high-entropy carbide ceramic is prepared by selecting and combining Ti powder and carbide powder with different molar contents, introduction of carbon vacancies is achieved, the diffusion coefficient of the material is effectively improved, a solid solution with a single phase is finally formed, and the prepared high-entropy ceramic has high density and high hardness.

The invention relates to the technical field of energy storage, in particular to an iron monatomic modified carbon nanotube array, a preparation method and application of the iron monatomic modified carbon nanotube array in an aqueous zinc-iodine battery, simple and convenient solid-phase reaction and high-temperature carbonization strategies are adopted, carbon cloth serves as a substrate, ferric acetylacetonate, boric acid, polyethylene glycol and urea serve as an iron source, a boron source, a carbon source and a nitrogen source respectively, and the iron monatomic modified carbon nanotube array is prepared. And after high-temperature calcination, growing an iron monatomic modified carbon nanotube array on the carbon cloth in situ. The iron single atom not only enhances the chemical capture capability of the carbon nanotube on the polyiodide, but also promotes the oxidation-reduction conversion of iodine; the carbon nanotube array provides a physical space for limited adsorption of iodine species and effectively promotes ion diffusion. Therefore, the obtained water-based zinc-iodine battery shows high specific capacity and good cycling stability. The whole technological process is simple and convenient to operate, has industrial application prospects, and provides a novel preparation method for the carbon-based iodine positive electrode host material of the aqueous zinc-iodine battery.

The invention relates to a thermal / environmental barrier coating and a preparation method thereof. The coating is of a three-layer structure and sequentially comprises a silicon bonding layer, an ytterbium silicate environment barrier layer and a (RE1xRE21-x) 3TaO7 thermal barrier surface layer from inside to outside. The ytterbium silicate environmental barrier layer is formed by mixing Yb2SiO5 and Yb2Si2O7; a (RE1xRE21-x) 3TaO7 thermal barrier surface layer, wherein x is more than or equal to 0.5 and less than 1; in the preparation method, the high-performance thermal / environmental barrier coating is efficiently prepared by adopting the scheme of synthesizing target powder through a solid-phase reaction, preparing a spraying feed through spray granulation and depositing the coating layer by layer through plasma spraying and utilizing the mechanisms of synergistic improvement of functions of the multi-layer coating, doping modification of rare earth elements and the like. The thermal / environmental barrier coating disclosed by the invention has the advantages of excellent CMAS corrosion resistance, good thermal insulation effect and high layer-to-layer thermal matching, and the service life of the SiCf / SiC composite material can be prolonged under the temperature condition of 1500 DEG C by the thermal / environmental barrier coating.

The invention relates to a purple-light-excited blue-light fluorescent material for a sunlight-like LED (light-emitting diode) as well as a preparation method and application of the blue-light fluorescent material. The chemical expression of the fluorescent material is Ca2LuZr2Al1. 5Ga1. 5O12: xCe < 3 + >, wherein x is more than or equal to 0.02 and less than or equal to 0.07. The blue light fluorescent material for the purple light excitation type sunlight LED is a brand new and unreported purple light excitation Ce < 3 + > doped oxide blue light emission fluorescent material, the fluorescent powder has a wide excitation band, the effective absorption range covers 300-450 nm, the fluorescent powder can be excited by purple light, and blue light with the central wavelength being 485 nm is emitted. The fluorescent powder has the advantage of stable physical and chemical properties, can be prepared by adopting a conventional solid-phase reaction method, has the characteristics of simple preparation process and facilitation of industrial production, and can be used as a good candidate material for wide application of a next-generation full-spectrum illumination white light LED (light-emitting diode). The fluorescent powder can be completely and well matched with the existing purple light chip, meets the commercial market requirements, and is suitable for application of white light LEDs, sunlight-like LEDs, full-spectrum LEDs and the like.

The invention discloses a uniform-heat photocatalytic reactor suitable for gas-solid phase reaction, and aims to solve the problems of non-uniform heating of a sample, insufficient contact between a catalyst and reaction gas and generation of a thermocatalytic effect in a metal reaction cavity in the existing reactor. According to the reactor, the nonmetal reaction cavity is adopted, so that thermocatalytic background noise generated by metal materials is avoided, and meanwhile, it is ensured that a sample is uniformly heated in the photocatalytic reaction process. The quartz reaction chamber provided by the invention can ensure full contact between the catalyst and the reaction gas, and improves the catalytic efficiency. The reactor is simple in structure, convenient to operate and suitable for various gas-solid phase photocatalytic reaction experiments. The catalyst is suitable for gas-solid phase catalytic reactions such as ammonia decomposition hydrogen production and carbon dioxide reduction, and is widely applied to the fields of environmental protection and energy conversion.

The invention relates to the technical field of novel environment-friendly materials, in particular to a ZnO / ZnFe2O4 desulfurization adsorbent with a stable porous structure and a preparation method of the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure, and the preparation method of the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure comprises the following steps: step 1, preparing a zinc-iron salt mixed solution; preparing an alkaline mixed solution; step 2, dropwise adding the alkaline mixed solution prepared in the step 1 into the zinc-iron salt mixed solution while stirring, and adjusting the pH value to 9-10; then carrying out a water bath reaction to obtain a zinc iron-double metal hydroxide; 3, the zinc iron-bimetal hydroxide prepared in the step 2 is subjected to high-temperature calcination, and the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure is obtained.The zinc iron-bimetal hydroxide (ZnFe-LDH) serves as a raw material, under the high-temperature calcination condition, the ZnFe-LDH is decomposed to generate ZnO and Fe2O3, then the ZnO and the Fe2O3 are further subjected to a solid-phase reaction to generate ZnFe2O4 (excessive ZnO), and the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure is obtained. And finally, the ZnO / ZnFe2O4 desulfurization composite adsorption material is prepared.

The invention belongs to the field of application of lead-based piezoelectric ceramics, and particularly relates to a preparation method of piezoelectric ceramics capable of obtaining piezoelectric property without polarization. The surface of PZT-BZnI powder is uniformly coated with a nano film ZSO through an oil-phase nano reactor, the PZT-based piezoelectric ceramic is prepared through solid-phase reaction, rapid sintering and rapid cooling, the phase change of the ZSO occurs in the rapid cooling process, pressure stress with proper size and uniform distribution is generated at the grain boundary of the PZT-based ceramic, the piezoelectric effect is induced, and the piezoelectric ceramic can directly obtain the piezoelectric property without polarization. The oil-phase nano-reactor has the advantages that the surface of the lead-based powder is uniformly coated with the nano-film, and the defects that an existing core-shell structure is complex in preparation process and uneven in distribution are overcome; the uniformly coated nano-film ZSO generates lasting and uniform pressure stress through phase change, so that the piezoelectric property of the lead-based piezoelectric ceramic is obtained without polarization, and depolarization is avoided.

The invention belongs to the technical field of batteries, and relates to an organic-inorganic compound halide solid electrolyte material, a preparation method thereof and a battery, the structural general formula of the solid electrolyte is (DaZc) m (at) (BdWe) n, D represents at least one of Sc, In, Y, Hf, Zr, Ta, Nb, Al, Mo, Ti, V, Ga, Sb, Cd, La, Ce, Pr, Sm, Nd, U, Eu, Er, Ho, Dm, Yb, Lu and Gy; z represents at least one of F, Cl, Br, I, O and S; b represents at least one of Li, Na, Ag, Cu, Cs, K, Mg and Ca; w is an organic acid ion. DaZc and BdWe are mixed in a water-free and oxygen-free environment, a solid-phase reaction is carried out, and the halide solid electrolyte is obtained. The halide solid-state electrolyte material provided by the invention can be simultaneously matched with an oxide positive electrode and a lithium metal negative electrode, is beneficial to solving the technical problem of poor matching property of an existing electrolyte material and the lithium metal negative electrode, and improves the energy density and the cycling stability of a solid-state battery.

The invention relates to a method for preparing lithium sulfide through a high-temperature solid-phase reaction. Weighing lithium carbonate and powdered sulfur, and putting the lithium carbonate and the powdered sulfur into an agate mortar for grinding; transferring the ground mixture into a high-temperature-resistant ceramic crucible, and putting the ceramic crucible into a vacuum tube furnace for presintering; after the presintering is finished, carrying out high-temperature reaction; after the reaction is finished, turning off a heating power supply of the vacuum tube furnace, and naturally cooling the crucible to room temperature in the furnace; after cooling is completed, opening a furnace door, and taking out the crucible to obtain a lithium sulfide crude product; putting the lithium sulfide crude product and the wear-resistant dispersing agent into the mortar, and grinding and crushing again; then screening by a standard screen to obtain lithium sulfide powder products with different particle sizes; the wear-resistant dispersing agent is prepared by reacting dioctadecylamine, an epoxy succinic acid polymer and ethidene diamine; the lithium sulfide prepared by the method disclosed by the invention has relatively high purity and yield.

The invention discloses an atomic-scale catalyst for laser solid-phase synthesis as well as a preparation method and application of the atomic-scale catalyst. The preparation method comprises the steps that a solid-phase reaction system is formed, the solid-phase reaction system comprises a carbon-based material with a plurality of anchoring points on the surface and a metal salt precursor loaded on the carbon-based material, and the metal salt precursor is combined with the anchoring points; and carrying out laser irradiation on the solid-phase reaction system, so that the metal salt precursor is reduced to form the atomic-scale catalyst. The atomic-scale catalysts prepared by the method are diversified and comprise monatomic catalysts, diatomic catalysts, monatomic alloys, diatomic alloys, atomic clusters and the like. The preparation method is simple in process, high in universality and suitable for various carbon-based materials containing anchoring points and metal elements with catalytic activity, atomic-scale catalysts can be produced in batches, and the requirements for various catalysts in the fields of chemical industry, petroleum processing industry, energy, pharmaceutical industry, environmental protection and the like can be met.

The invention provides an alkyne selective hydrogenation catalyst with high activity and high selectivity and a preparation method thereof. The catalyst is a compound of metallic nickel and alkali metal hydride and is marked as nickel-alkali metal hydride, high catalytic reaction activity and high olefin selectivity can be both considered by regulating and controlling the proportion of the nickel elementary substance and the alkali metal hydride, and compared with the metallic nickel and the alkali metal hydride as the catalyst, the catalyst has the advantages that the catalytic activity is high; the catalytic activity and the olefin selectivity are greatly improved. The nickel-alkali metal hydride catalyst is suitable for alkyne selective hydrogenation reaction in a high-temperature and high-pressure fixed bed gas phase reaction system, is also suitable for alkyne selective hydrogenation reaction in a high-temperature and high-pressure reaction kettle liquid-solid phase reaction system, and has a good application prospect.

The present invention discloses an abnormal thermal quenching near-infrared fluorescent ceramic and its preparation method and application. The chemical formula of the fluorescent ceramic is: (Lu 0.34+z Y 0.66‑y‑z Sc y )3(Sc 0.85‑x Al 0.15 Cr x )2Al3O 12 , 0.0005≤ x ≤0.02, x : y =1:(5‑10), x : z =1:(10‑20). y Sc 3+ The mole percentage of dodecahedral sites occupied, x Cr ions occupy the octahedron Sc 3+ The molar percentage of the lattice site. z is the Lu in the dodecahedron 3+ The molar percentage of the metering control. The ceramic green body is formed and sintered by using the acrylamide gel injection molding method combined with high temperature solid phase reaction. The luminescent center ion in the ceramic of the present invention presents a +3 valence state under the influence of the matrix microenvironment regulator (calcium carbonate, magnesium oxide and zirconium oxide, silicon dioxide, hafnium dioxide). The excitation peak of the ceramic is between 430nm-460nm, the half-height width is between 90nm-130nm, and the half-height width is between 150nm-160nm. o The luminous intensity at 200°C is 105%-165% of the room temperature. o The luminescence intensity at 400°C is 130%-200% of that at room temperature. When excited by a 430-460 nm excitation source, the emission wavelength ranges from 650 nm to 900 nm. The ceramic preparation process is simple, and the resulting anomalous thermally quenched near-infrared fluorescent ceramic is suitable for high-power near-infrared imaging and detection.

The invention relates to the technical field of cultural relic protection materials, in particular to high-activity beta-Ca2SiO4 for cultural relic protection as well as preparation and application of the high-activity beta-Ca2SiO4. On the basis of a traditional solid-phase synthesis process, a novel boron-containing crystal form stabilizer is adopted, high-activity beta-Ca2SiO4 is obtained through high-temperature solid-phase synthesis, or high-activity beta-Ca2SiO4 is obtained through jet mill smashing after high-temperature solid-phase synthesis. The boron-containing crystal form stabilizer with low water solubility is selected, so that on one hand, boron volatilization during high-temperature solid-phase reaction is effectively reduced; and on the other hand, during wet processing, the non-uniform phenomena of crystallization, layering and the like after drying caused by the use of water-soluble crystal stabilizers such as boric acid and sodium borate are effectively avoided. In addition, calcium and calcium-silicon elements contained in the introduced boron-containing crystal form stabilizer are essential components during synthesis of beta-Ca2SiO4, and the content of soluble salt in the high-activity beta-Ca2SiO4 prepared by the method is lower.

The preparation method comprises the following steps that hexagonal boron nitride is subjected to carbon coating treatment through a carbon source, then the carbon source is placed in a vacuum reaction furnace at the temperature of 1500-2000 DEG C to be subjected to a solid-phase reaction, and the carbon source comprises a carbohydrate compound and an oxygen-containing compound; the carbon coating treatment comprises the following steps: (1) mixing a carbohydrate compound and hexagonal boron nitride, carrying out ball milling, adding water into the obtained mixed powder, uniformly dispersing, and then carrying out hydrothermal carbonization to obtain primary carbon-coated boron nitride; and (2) spraying an oxygen-containing compound on the surface of the primary carbon-coated boron nitride obtained in the step (1), cooling, drying, carrying out closed carbonization at 500-1000 DEG C for 3-6 hours, and naturally cooling to obtain secondary carbon-coated boron nitride. According to the method, the carbon source is directly adopted to perform surface amorphous carbon coating on the nanoscale hexagonal boron nitride, so that the boron nitride powder is prevented from being agglomerated, the reaction of the carbon source and the boron nitride can be promoted, and the quality of the boron carbide nano powder is improved.

The present invention discloses an Al2O3 modified Yb2Si2O7 material for a hot end component surface environmental barrier coating, and its preparation method and application, belonging to the field of environmental barrier coating. The material is synthesized by a solid phase reaction combined with a sintering process. The obtained material contains both Yb2Si2O7 and Yb3Al5O 12 Compared with undoped Yb2Si2O7, the doped material is denser, has lower porosity and higher density, and at the same time, Yb3Al5O will be generated at high temperature after doping. 12 It will effectively improve the high-temperature corrosion resistance of Yb2Si2O7, increase its service life, and has good application prospects.

The invention provides a colorless high-permeability flame-retardant phosphorylated nanocellulose reinforced PVA film prepared based on secondary swelling, which is characterized in that cellulose is preliminarily swelled by a NaOH solution, then quantitative urea and NH4H2PO4 are added to be effectively mixed with the cellulose, solid-phase reaction is performed after water is dried, the subsequent phosphorylation degree is increased while secondary swelling is performed, and the film is prepared by using a one-step method to prepare the colorless high-permeability flame-retardant phosphorylated nanocellulose reinforced PVA film. The phosphorylated nanocellulose with high phosphorus content is prepared and serves as a filler, and the flame-retardant, colorless and transparent reinforced PVA film can be prepared through a solution method for molding. Through secondary swelling treatment, the yellowing and blackening problems of cellulose in the phosphorylation reaction process are prevented, and the prepared reinforced PVA film achieves a better flame-retardant effect by adding a smaller amount of flame-retardant components on the premise that the mechanical property is improved and the transparency is not damaged.

The invention relates to the technical field of electrocatalysis, in particular to a preparation method and application of a novel bismuth nanocrystal / nitrogen-rich graphite carbon electrocatalyst, and the preparation method comprises the following steps: S1, adding urea and ammonium chloride into water, stirring, freeze-drying and grinding to obtain a chelating ligand; s2, adding bismuth citrate into the chelating ligand, and carrying out solid-phase reaction to obtain a precursor; and S3, calcining the precursor under the protection of nitrogen to obtain the bismuth nanocrystal / nitrogen-rich graphite carbon electrocatalyst. The problems that reduction and reconstruction reactions are likely to happen in the CO2 electrocatalytic reduction catalysis process, and the difficulty of active site recognition and performance regulation and control is increased can be solved.

The invention discloses a preparation method of a gasoline car honeycomb ceramic carrier with an ultralow thermal expansion coefficient, and belongs to the technical field of honeycomb ceramic materials. The method comprises the following steps: selecting raw materials; performing pretreatment; mixing the materials; kneading mud; performing extrusion molding; and cutting and firing to obtain the cordierite honeycomb ceramic carrier. A magnesium source in talc and a part of an aluminum source in alpha-aluminum oxide are replaced by the monohydrate boehmite and the magnesium oxide which are higher in reaction activity, the sol is formed through a complexation reaction with citric acid, then the sol is mixed with silicon dioxide and aluminum oxide particles, the reaction activity of a solid-phase reaction is improved at the same firing temperature, and the solid-phase reaction time is shortened. The thermal expansion coefficient of the cordierite honeycomb ceramic carrier is effectively reduced, and the thermal shock resistance requirement of gasoline cars in the national sixth emission standard can be met.

The invention provides a low-melting-point composite lithium salt, a preparation method thereof and a lithium ion battery positive electrode material, and relates to the technical field of lithium battery positive electrode materials. The preparation method comprises the following steps: burdening and mixing a first lithium source, a second lithium source and a doping agent, then molding and smelting to obtain a melt, and carrying out gas atomization on the melt to obtain the low-melting-point composite lithium salt powder. According to the invention, the optimal proportion of each lithium salt is optimized, a certain amount of alkali metal or alkaline earth metal is added, and the low-melting-point composite lithium salt is prepared through a melting-gas atomization method technology, so that different lithium salts and doped raw materials can be fully mixed to achieve molecular-level uniformity, which is more beneficial to solid-phase reaction in the sintering process after lithium preparation, and the lithium-rich composite lithium salt is obtained. And the positive electrode material with more uniform structure and more excellent performance is obtained.

The present invention provides an oxide material and a preparation method thereof, a positive electrode sheet and a lithium ion battery. The chemical formula of the oxide material is Li m Ni x Co y Mn z A (1‑x‑y‑z) O2; wherein, 0.9≤m≤1.3, 0≤x≤1, 0≤y≤1, 0≤z≤1, 0<x+y+z≤1, and A includes at least one of Fe, Ti, Al, Mg, Nb, Ce, Sb, Y, La, Zr, and Zn. The present invention achieves atomic-level mixing of lithium with nickel, cobalt, and manganese elements to improve the mass transfer path during solid-phase reaction, and the oxide can be synthesized at a relatively low temperature, thereby saving manufacturing costs and improving the consistency of product batches. The lithium element and nickel, cobalt, and manganese elements are evenly distributed in the oxide material of the present invention, and the structure is stable. As a positive electrode material, it has good rate performance in a high limiting voltage system, and excellent high-temperature cycling and storage performance.

The invention relates to the technical field of soft magnetic ferrite materials, in particular to a preparation method of a high-permeability soft magnetic ferrite core material, which comprises the following steps: firstly, preparing FeSiCrBCu soft magnetic alloy powder with uniform components and controllable particle size through a single-roller quenching and hydrogen decrepitation process, and laying a structural foundation for excellent magnetic performance; and then a mechanical stirring-ultrasonic synergistic coating technology is utilized, so that the ferrite precursor uniformly coats the alloy powder, an effective core-shell structure is formed, and solid-phase reaction and crystal grain uniform growth during sintering are promoted. Besides, a multi-task deep learning model (MTL-DL) based on transfer learning is adopted to carry out multi-objective collaborative optimization on the sintering process, accurately match and dynamically adjust key parameters, and accurately regulate and control the material densification process, the grain size and the phase distribution on the microcosmic level, so that the problem that the microstructure and component uniformity are difficult to accurately control in the prior art is solved; therefore, the problems of poor material performance and high power loss are solved.

The invention provides a composite positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the technical field of new energy. According to the method, on the basis of a coprecipitation-solid phase reaction, different complexing agent concentrations and rotating speeds are set in the two-stage coprecipitation process to obtain a composite positive electrode material precursor, and then a fluxing agent is added in the subsequent solid phase sintering process, so that the LLZO solid electrolyte is tightly coated on the surface of the high-nickel ternary positive electrode material. According to the synchronously synthesized high-nickel ternary / LLZO composite positive electrode material provided by the invention, the LLZO solid electrolyte and the high-nickel ternary material are in closer contact and more uniform coating, so that the direct contact between the electrolyte and high-activity Ni < 4 + > is prevented while the lithium ion transmission kinetics is improved, the generation of a rock salt phase is reduced, and the service life of the lithium ion battery is prolonged. And the garnet type LLZO electrolyte can enhance the phase change reversibility of the high-nickel ternary material through a lithium supplement strategy, so that the composite positive electrode material with high rate performance and high cycle stability is obtained.

The invention relates to a method for semi-solid-phase synthesis of a polycyclic compound and an intermediate, a long chain is synthesized through solid phase, then two-step ring closing is performed to form a key intermediate, and simple derivation is performed on the basis of the key intermediate to obtain a PCSK9 antagonist compound. According to the invention, starting materials for solid-phase synthesis are selected, steric hindrance is effectively avoided, and solid-phase reaction and subsequent liquid-phase correlation cyclization can be smoothly carried out, so that the yield is improved, and the cost is reduced.

This invention discloses a high-entropy transition metal nitride ceramic material and its preparation method. The preparation method includes the following steps: mixing n kinds of transition metal nitride powders and m kinds of transition metal powders, vacuum drying to obtain a precursor; placing the precursor in a mold and performing pre-pressing treatment to obtain a pre-pressed sample; sintering the pre-pressed sample in a sealed environment at a temperature of 500–3500℃ and a pressure of 2–28 GPa to obtain the high-entropy transition metal nitride ceramic material; wherein n≥1, m≥0, and the total number of transition metal elements in the precursor is four or more. This invention improves the stability of the precursor and reduces the size and distance of particles within the precursor through two pressure treatments, achieving for the first time the synthesis of high-density, high-purity high-entropy transition metal nitride ceramic materials via solid-state reaction.

The invention discloses an extrusion-molded magnesium oxide tube and a processing technology thereof, and relates to the technical field of functional ceramics, and the processing technology comprises the following steps: mixing magnesium oxide and inorganic auxiliary materials, and carrying out ball milling; adding a binder, carrying out extrusion molding, and sintering to obtain a magnesium oxide tube; the inorganic auxiliary material is a mixture of aluminum oxide and titanium boride in a mass ratio of (0.5-3.0): 1. According to the invention, by adding the inorganic auxiliary material, alumina and magnesium oxide are subjected to a solid-phase reaction to generate a magnesium aluminate spinel phase, so that the thermal shock resistance, high temperature resistance and thermal conductivity of a sintered product are improved. Introduced titanium boride can react with gas volatile matter generated by sintering of the binder, and cooperates with a sintered product of the binder to form three-dimensional ceramic among magnesium oxide particles, so that the hardness, high temperature resistance and stability of the sintered product are improved, and the heat transfer efficiency of the sintered product is improved.

The invention relates to the field of catalysis, in particular to a method for preparing a nickel-based catalyst through a solid-phase reaction, the nickel-based catalyst and a preparation method of synthesis gas. The invention provides a method for preparing a nickel-based catalyst through solid-phase reaction, which comprises the following steps of: 1, respectively mixing cerium nitrate and a silicon dioxide carrier with water to obtain two mixed solutions, mixing the two mixed solutions, adding a dilute ammonia water solution to adjust the pH value, adding an ammonia water solution of nickel nitrate, uniformly mixing, transferring into a hydrothermal kettle, and carrying out hydrothermal treatment to obtain a nickel-based catalyst precursor; the catalyst is separated by rotary evaporation. And 2, sequentially carrying out high-temperature heat treatment on the catalyst in a vacuum atmosphere and a hydrogen atmosphere to obtain a catalyst product. The preparation method provided by the invention is a solid-phase reaction strategy and is generally a two-step preparation method. The catalyst prepared by the method is used in a methane dry reforming reaction, and can maintain extremely high catalytic activity and high stability.