29 results about "Aluminium carbide" patented technology

The invention discloses a method for growing titanic acid / titanium dioxide nanoparticles on a titanium carbide Mxene sheet layer, and relates to a method for growing titanic acid / titanium dioxide nanoparticles on the surface of a titanium carbide Mxene sheet layer structure. The method comprises the following steps: firstly, etching titanium aluminum carbide at room temperature by adopting hydrofluoric acid to obtain a layered titanium carbide Mxene material, then dispersing the layered titanium carbide Mxene material in hydrogen peroxide with the mass percent concentration of 20-30%, simultaneously adding 0.6 ml of 65% nitric acid, and reacting for 24-72 hours at the temperature of 20-80 DEG C, so that titanic acid nanoparticles can grow on the surface of a titanium carbide Mxene lamellar structure; and subsequently carrying out heat treatment in an air atmosphere at 200-500 DEG C, and converting the titanic acid into anatase titanium dioxide. The preparation temperature is low without high pressure; the nanoparticles keep a lamellar structure aggregation state, and are expected to be applied to the fields of adsorption, photocatalysis and the like.

The present application relates to a composite current collector (10). [Solution] The composite current collector (10) includes: a base layer (1) having a first surface (11) and a second surface (12) arranged back to back along the thickness direction, the base layer (1) being made of a polymer material; a first modified layer (3) arranged on the first surface (11) of the base layer (1), the first modified layer (3) being made of one or more of silicon carbide oxide, titanium carbide oxide, and aluminum carbide oxide nanomaterials; and a first metal layer (2) arranged on the surface of the first modified layer (3) facing away from the base layer (1).

The invention discloses an integrally-formed carbon-free special-shaped foamed aluminum electrolytic capacitor anode and a preparation method thereof, and belongs to the technical field of electrolytic capacitor electrode materials. Spherical atomized pure aluminum powder is used as a base body and matched with a carbon-free pore forming agent and a carbon-free inorganic binder, a mold matched with a cavity is customized according to the installation space of target equipment, and the integrated special-shaped open-cell foamed aluminum anode with the solid welding area is prepared through layered powder laying and cold pressing forming, low-temperature curing and synchronous pore forming at the temperature of 180-250 DEG C, aftertreatment and global anodic oxidation. No carbon source is introduced in the whole process, aluminum carbide is prevented from being generated from the source, and the problems of capacitor swelling and internal resistance soaring pain points caused by carbon residues in the prior art are solved; excessive oxidation of the aluminum powder is avoided through low-temperature curing, integral forming is achieved without splicing, the device can adapt to any special-shaped installation space, and the space utilization rate is increased by 3-10 times; the effective specific surface area of the prepared anode reaches 500-800 times and is far better than that of a traditional corrosion aluminum foil, and the customized application requirement of a liquid / solid electrolytic capacitor is perfectly met.

The invention belongs to the technical field of aluminum ash detection, and discloses a device for measuring the content of metallic aluminum in aluminum ash, which comprises a nitrogen bottle, an ammonia gas absorption bottle, a double-elbow gas measuring pipe, a reaction bottle, a sample bottle, a leveling bottle, an electric furnace, a copper oxide pipe, a first gas guide pipe, a second gas guide pipe and a breather pipe, the breather pipe is provided with a first valve, a third valve, a fourth valve, a fifth valve and a sixth valve in sequence; the upper end of a spherical pipe of the double-elbow gas measuring pipe is connected with the breather pipe through a fifth valve, and the lower ends of a straight pipe and the spherical pipe of the double-elbow gas measuring pipe are connected with the leveling bottle through a seventh valve and an eighth valve respectively; one end of the copper oxide tube is connected with the third valve, and the other end of the copper oxide tube is connected with the fourth valve. Ammonia gas absorption and copper oxide reduction are achieved through valve switching, the hydrogen amount is obtained by measuring the volume, temperature and air pressure of gas in the device before and after copper oxide reduction through hydrogen, then the metal aluminum content in the aluminum ash is obtained, and the influence of aluminum nitride and aluminum carbide in the aluminum ash is effectively avoided.

The invention relates to the technical field of superhard material tools, and discloses a diamond saw blade for cutting granite and a preparation process of the diamond saw blade for cutting granite, the matrix raw materials of the diamond saw blade for cutting granite comprise reduced iron powder, carbonyl nickel powder, reduced cobalt powder, water atomized Cu-Sn pre-alloy powder, Cu-P pre-alloy powder, titanium hydride powder and boron carbide powder. The preparation process comprises the steps of ingredient mixing, cold press molding and step-by-step temperature control hot press sintering, and coordination of exhaust and densification is achieved by accurately controlling the temperature and pressure of solid degassing, liquid-phase relay and in-situ reaction stages. According to the method, the gradient of melting points of the Cu-P and Cu-Sn pre-alloy is utilized to construct a stepped liquid phase, so that the foaming problem caused by conflict between titanium hydride exhaust and liquid phase hole sealing is solved; and the formula does not contain aluminum, strength attenuation caused by hydrolysis of aluminum carbide is eliminated, the density of the saw blade is remarkably improved, the diamond holding force is remarkably improved, and the service life of the saw blade under the wet cutting working condition is remarkably prolonged.

The application provides a preparation method and application of melamine-formaldehyde modified Mxene, first, melamine-formaldehyde prepolymer is synthesized, then Mxene is prepared by stripping aluminum carbide through a lithium fluoride acid solution, finally, the melamine-formaldehyde prepolymer and the stripped Mxene are in-situ polymerized to obtain melamine-formaldehyde modified Mxene, the melamine-formaldehyde modified Mxene is compounded with each component of ink, and grinding and filtering are carried out, so that high-efficiency heat-conducting UV-LED ink is obtained, the melamine-formaldehyde resin is used for embedding treatment of Mxene, so that the dispersibility of Mxene is improved, the technical problem of poor compatibility of Mxene and an ink matrix is solved, and then, the connecting material, the pigment and various kinds of additives are supplemented, UV-LED heat-conducting ink is prepared, the agglomeration of Mxene is effectively prevented, and the heat conductivity of the heat-conducting ink is greatly improved, and the heat conductivity coefficient of the ink film after printing is up to 1.32 W / m.K in the plane direction.

The invention belongs to the technical field of diamond copper composite materials, and particularly relates to a preparation method of a high-strength and high-thermal-conductivity copper-based composite material and the high-strength and high-thermal-conductivity copper-based composite material. The preparation method of the high-strength and high-thermal-conductivity copper-based composite material comprises the following steps that (1) diamond particles and copper-aluminum alloy powder are mixed and then subjected to heat treatment in an inert atmosphere, and diamond-copper mixed powder is obtained; and 2) mixing the diamond-copper mixed powder obtained in the step 1) with an oxygen source, performing compression molding, and performing internal oxidation reduction sintering. Aluminum carbide and Cu-Al-C are generated on the surface of diamond in situ through interface reaction to improve the interface bonding strength of the diamond and a copper matrix, Al2O3 nanoparticles are generated in situ through internal oxidation-reduction-sintering, the interface bonding capacity and the heat conduction performance are further improved, and then preparation of the high-strength and high-heat-conduction copper-based composite material is achieved.

The present invention relates to a method for producing an electrical insulation layer on an iron sheet for laminated cores of an electrical machine, comprising the steps: a) providing at least one uncoated iron sheet, in particular steel sheet, deep-drawn sheet or electrical sheet, which is a sheet lamination for a laminated core or a sheet coil, b) providing an aluminum-containing first reaction component, in particular in the form of a powder, a paste or a foil, c) providing a carbon-containing second reaction component, in particular in the form of a powder, a paste or a foil, d) applying the two reaction components to at least one side of the at least one uncoated iron sheet to form at least one coating layer, e) heating the at least one coating layer to initiate a reaction between the two reaction components to form aluminum carbide in the coating layer,in particular in a hydrogen atmosphere, f) treating the coating layer with moisture, in particular water vapor, to convert the aluminum carbide present in the coating layer into aluminum hydroxide, and g) thermally converting, in particular decomposing, the aluminum hydroxide of the coating layer into aluminum oxide to produce an electrically insulating property of the coating layer, thereby forming the insulating layer.

The invention provides a method for synergistically preparing aluminum carbide through aluminum electrolysis anode scrap and aluminum-containing waste, and belongs to the field of solid waste recycling. The method comprises the following steps: crushing and pickling the aluminum electrolysis anode scrap to remove fluoride and metal impurities in the aluminum electrolysis anode scrap to obtain a mixture; performing solid-liquid separation on the mixture to obtain filtrate and first filter residues; washing and drying the first filter residues to obtain second filter residues; the second filter residues and aluminum-containing waste are ground, and mixed powder is obtained; adding a fluxing agent into the mixed powder, and pressing into blocks to obtain blocks; under the atmosphere of argon and / or helium, roasting, crushing and grinding the lumps to obtain roasted powder; and the roasted powder is subjected to ultrasonic cleaning, and an aluminum carbide product is obtained. According to the method, aluminum carbide is prepared through cooperation of the aluminum electrolysis anode scrap and the aluminum-containing waste, two kinds of solid waste difficult to treat are treated with waste, the production cost can be effectively reduced, and cooperative recycling of the solid waste is achieved.

The invention provides a chromium aluminum carbide-cerium oxide hybrid filler and filler-reinforced self-lubricating fiber fabric composite material as well as a preparation method and application thereof, and relates to the technical field of solid lubricating materials. The chromium aluminum carbide-cerium oxide hybrid filler provided by the invention comprises aminated chromium aluminum carbide particles and cerium oxide nanoparticles loaded on the surfaces of the aminated chromium aluminum carbide particles, the aminated chromium aluminum carbide particle comprises a chromium aluminum carbide particle and a polydopamine-polyethyleneimine copolymer layer coated on the surface of the chromium aluminum carbide particle. Wherein the chromium aluminum carbide has the characteristics of high bearing capacity and strong wear resistance; cerium oxide can form a self-healing friction transfer film under the action of stress, and the friction reducing and lubricating effects are achieved. In addition, the cerium oxide nanoparticles show a high specific surface area, so that the filler can better interact with the fabric and the resin, and frictional wear on the nanoscale is reduced. The hybrid filler provided by the invention can obviously enhance the tribological performance of the self-lubricating fabric composite material.

Methods, systems, and apparatus are disclosed for depositing a composite film, including providing a substrate in a reaction chamber, depositing a first material layer comprising a first metal nitride according to a first cyclic deposition process, depositing a second material layer comprising aluminum carbide according to a second cyclic deposition process, and depositing a second metal nitride according to a third cyclic deposition process. And depositing a third material layer comprising the second metal nitride according to a third cyclic deposition process.

A method and apparatus for detecting aluminum carbide content includes a right-angle tube I connected to a round-bottom flask via a rubber stopper I at its inlet. One end of the rubber tube I is connected to one port of a three-way valve, and the other two ports of the three-way valve are connected to rubber tubes II and III, respectively. The other end of the rubber tube II is connected to the gas inlet of a gas chromatograph. The other end of the rubber tube III is connected to the inlet of the right-angle tube II. The outlet of the right-angle tube II, a thermometer, and the inlet of the right-angle tube III are all embedded in the rubber stopper II and installed at the mouth of a specially designed measuring cylinder. The outlet of the right-angle tube III is connected to the inlet of the right-angle tube IV via a rubber tube IV. The outlet of the right-angle tube IV, along with a glass tube, is embedded in the rubber stopper III and installed at the mouth of a conical flask. By measuring the gas volume and composition sequentially through the three-way valve, the aluminum carbide content in the sample is determined using a function model. This allows for direct observation of changes during the detection process, effectively reducing operational errors and improving the accuracy of the detection results.

The invention relates to a combustion improver based on aluminum carbide waste salt and a preparation method thereof. The preparation method comprises the following steps: crushing the aluminum carbide waste salt, and then washing and drying by adopting a multi-stage countercurrent washing process; mixing the pretreated aluminum carbide waste salt with biomass charcoal powder, and then performing segmented carbonization modification in an inert atmosphere to obtain an aluminum carbide waste salt base material; adding a fluxing agent, a catalyst, a denitration auxiliary agent and a reducing agent into the aluminum carbide waste salt base material, uniformly stirring, and finally forming and post-treating to obtain the combustion improver based on the aluminum carbide waste salt. The technical problem to be solved is how to provide the preparation method of the combustion improver based on the aluminum carbide waste salt, and the technical problems that existing aluminum processing waste salt is difficult to dispose and wastes resources and a traditional combustion improver is high in cost, large in pollution and poor in combustion performance can be solved through a multi-stage process strategy of pretreatment impurity removal, carbonization modification and component compatibility. The harmless, recycling and high-value utilization of the waste salt is realized.

This invention provides a manufacturing process and portable assembly / disassembly device for a high-capture-efficiency fiberglass filter, comprising the following steps: S1: Precisely controlling the composition of the raw materials for manufacturing the fiberglass filter, and then calcining it in a crucible to form a molten fiberglass material; S2: Cooling the molten fiberglass material in S1 and then performing centrifugal spinning, while precisely controlling the temperature and humidity during the spinning process. Compared with the prior art, this invention has the following beneficial effects: The manufacturing process of the high-capture-efficiency fiberglass filter begins with the precise proportioning of raw materials. High-purity quartz sand, calcined aluminum carbide, and calcium borate are mixed according to a formula of 52±0.5% silicon dioxide and 15±0.5% alumina. After hot pressing and shaping, the edges are sealed with two-component polyurethane slit coating. The curing process is monitored by infrared thermal imaging. The finished product is cured in an FFU+HEPA clean environment, and the filtration efficiency, air permeability, and other indicators are monitored by SPC control chart. Waste fibers are crushed, air-separated, and then incinerated at high temperature for recycling, and are recycled by re-mixing raw materials at a ratio of 1:8.

The present invention provides an aluminum carbide alloy filament and its manufacturing method, a heating device, and relates to the technical field of filament cathode materials. The aluminum carbide alloy filament includes a matrix (100) and a carbide layer (200) attached to the outer surface of the matrix (100). The carbide layer (200) has a grain width of 1.0 μm to 15.0 μm. The components of both the matrix (100) and the carbide layer (200) include tungsten, carbon, oxygen, and an M element, where the M element is one or a combination of elements selected from the group consisting of La, Y, Sc, Nd, Sm, Lu, Ce, Gd, Tb, Dy, Ho, Pr, Er, Tm, Yb, Eu, Hf, and Zr. The tungsten carbide alloy filament does not include thorium. This material improves the emission stability of tungsten alloy filaments and achieves the stable emission capability of conventional thorium-tungsten filaments without adding thorium, solving the problem of the relatively poor stable emission capability of existing thorium-free tungsten filaments and also eliminating the problem of radioactive contamination that occurs with conventional thorium-tungsten filaments.

The invention belongs to the technical field of ceramic coatings, and provides a diamond particle with the surface plated with an aluminum nitride / aluminum carbide coating and a preparation method of the diamond particle. The method comprises the following steps: mixing diamond particles, aluminum powder and melamine powder to obtain mixed powder; placing the mixed powder in a closed device to obtain closed mixed powder; and the closed mixed powder is subjected to heat treatment under the protective atmosphere, and the diamond particles with the surfaces plated with the aluminum nitride / aluminum carbide coatings are obtained. The raw materials of the coating are low in cost, and the aluminum powder and the melamine powder are adopted as the raw materials of the coating, so that the cost is low, and the raw materials are easy to obtain; a simple sealing means is combined with a high-temperature heat treatment process, so that the process and operation are simple and convenient, and large-scale production is easy to realize; by optimizing the raw material ratio and heat treatment process parameters, controllable adjustment of the coating can be achieved, and the requirements of different application fields for diamond performance are met.

The application provides a preparation method of a heat-conducting agent and a preparation method of a heat-conducting and flame-retardant rope. The application disperses nano aluminum nitride into an alcohol solvent, then adds a silicate material, coats the silicate material onto the surface of aluminum carbide through a liquid phase method, and prepares a silicon dioxide and carbon coated aluminum nitride material through high-temperature calcination (under an inert atmosphere). The method has the advantages of simplicity and controllable coating layer, and has hydrophobic and synergistic heat-conducting functions. The preparation method of the heat-conducting and flame-retardant rope is different from the traditional heat-conducting agent treatment of a textile rope. The isocyanate reacts with water to form a carboxylic acid group, and the carboxylic acid group and phytic acid and a ternary alcohol glycerol crosslink at high temperature. On the one hand, the phytic acid of the flame-retardant component is grafted in a chemical bond mode, and on the other hand, the isocyanate and the polyhydric alcohol form an organic coating layer similar to a polyurethane structure to firmly adhere the modified heat-conducting agent to the textile rope, so that a multifunctional material with heat-conducting and flame-retardant functions is formed.

The present application belongs to the technical field of ceramic coating, and provides a kind of diamond particles with surface plated aluminum nitride / aluminum carbide coating and a preparation method thereof.The method of the present application comprises the following steps: mixing diamond particles, aluminum powder and melamine powder to obtain mixed powder; the mixed powder is placed in a closed device to obtain closed mixed powder; the closed mixed powder is heat treated under a protective atmosphere to obtain diamond particles with surface plated aluminum nitride / aluminum carbide coating.The raw material cost of the coating of the present application is relatively low, and aluminum powder and melamine powder are used as the raw material of the coating, which is low in cost and easy to obtain; a simple sealing method is used in combination with a high-temperature heat treatment process, which is simple in process and operation and easy to realize large-scale production; by optimizing the raw material ratio and heat treatment process parameters, the present application can realize the controllable adjustment of the coating and meet the performance requirements of diamond in different application fields.

The invention relates to the technical field of catalytic materials, in particular to a CuFe2O4 / Mxene catalyst and a preparation method and application thereof. The specific preparation method comprises the following steps: dissolving a soluble copper salt and a soluble iron salt in a solvent, adjusting the pH value to 3.5-5.5, removing the solvent to a colloidal state, and calcining to obtain positively charged CuFe2O4; and adding an etching agent into the titanium aluminum carbide for etching to obtain the negatively charged Mxene. The preparation method comprises the following steps: dispersing positively charged CuFe2O4 and negatively charged Mxene in a solvent, and stirring to obtain the CuFe2O4 / Mxene catalyst. The CuFe2O4 / Mxene catalyst disclosed by the invention can be used for effectively activating peroxymonosulfate and rapidly degrading organic pollutants in an aqueous solution, and shows excellent catalytic performance.

The invention discloses an aluminum-based composite material with a gradient structure surface strengthening layer and a preparation method of the aluminum-based composite material. The aluminum-based composite material with the gradient structure surface strengthening layer comprises a composite material body and the gradient structure surface strengthening layer, wherein the composite material body is formed by a reinforcing body and a base body, and the gradient structure surface strengthening layer is generated on the surface of the composite material body in situ; wherein the reinforcement is carbide, and the matrix is pure aluminum or aluminum alloy; the gradient structure surface strengthening layer comprises an aluminum nitride and / or aluminum carbide strengthening layer, a nitrogen and / or carbon diffusion layer and a transition layer located between the aluminum nitride and / or aluminum carbide strengthening layer and the nitrogen and / or carbon diffusion layer. The carbide particles are introduced to serve as a reinforcing body, so that the overall hardness of the aluminum-based composite material is improved; the gradient structure surface strengthening layer is constructed on the surface of the composite material body in situ, so that the residual stress between the coating and the composite material body is obviously relieved, the bonding property of the coating and the composite material body is improved, and falling is prevented; and meanwhile, the gradient structure surface strengthening layer can further improve the hardness and wear resistance of the surface of the aluminum-based composite material.

A preparation method and application of a two-dimensional nano-titanium carbide / nonacobalt octasulfide heterojunction photocatalytic material. This invention aims to address the problem that, during the H2O2 production process, existing photocatalysts primarily absorb light in the red and near-infrared regions of visible light, resulting in low photogenerated carrier separation efficiency. The preparation method includes the following steps: 1. Sequentially add CH3CSNH2 and NaOH to a cobalt nitrate solution and stir at room temperature to obtain a Co9S8 matrix; 2. Add titanium aluminum carbide to a hydrofluoric acid solution and react for a long period of time to obtain a precursor Ti3C2 powder. This precursor Ti3C2 powder is then dispersed in a dimethyl sulfoxide solution and stirred to obtain Ti3C2 powder; 3. Prepare the Ti3C2 / Co9S8 heterojunction photocatalytic material. The Ti3C2 / Co9S8 heterojunction photocatalytic material prepared by this invention can expand the visible light absorption range and exhibit excellent photocatalytic H2O2 production activity.

The invention provides a manufacturing process of a high-trapping-efficiency glass fiber filter screen and a portable dismounting and mounting device.The manufacturing process comprises the following steps that S1, components of manufacturing raw materials of the glass fiber filter screen are accurately controlled, and then the glass fiber filter screen is calcined in a crucible to form a glass fiber melt; s2, the glass fiber melt in the S1 is cooled and then subjected to centrifugal spinning operation, and the temperature and humidity in the spinning process are accurately controlled. Compared with the prior art, the manufacturing process has the following beneficial effects that the manufacturing process of the glass fiber filter screen with the high trapping efficiency starts from the accurate matching of raw materials; high-purity quartz sand, calcined aluminum carbide and calcium borate are mixed according to the formula of 52 + / -0.5% of silicon dioxide and 15 + / -0.5% of aluminum oxide, two-component polyurethane is adopted for slit coating and edge packaging after hot-pressing shaping, the curing process is monitored through infrared thermal imaging, a finished product is cured in the clean environment of FFU + HEPA, indexes such as the filtering efficiency and the air permeability are monitored through an SPC control chart, and the finished product is obtained. The waste silk is subjected to high-temperature incineration recovery after being crushed and winnowed, and raw materials are doped back according to the proportion of 1: 8 to realize cyclic utilization.

The application belongs to the technical field of energy storage, and discloses a lithium-aluminum carbide-zinc composite lithium metal negative electrode and a preparation method and application thereof. A multi-phase alloy phase (Li single element, Al single element, LiZn alloy, Li3Al2 alloy and Li2C2) is formed by smelting of metal lithium, aluminum carbide and zinc single element. The lithium-aluminum carbide-zinc composite lithium metal negative electrode enhances the tensile strength and controls lithium stripping and deposition due to the presence of the LiZn alloy, the Li3Al2 alloy and the Al single element. The Li2C2 carbon-containing compound enhances the mechanical toughness of the composite lithium metal negative electrode. Compared with the existing pure lithium metal negative electrode, the lithium-aluminum carbide-zinc composite lithium metal negative electrode greatly improves the tensile strength, essentially improves the mechanical performance, and this characteristic inhibits the formation of lithium dendrites in the deep stripping and deposition process of lithium.

The invention discloses an aluminum / carbon nano composite material for lithium storage and a preparation method thereof, and belongs to the technical field of lithium ion battery negative electrode materials, an organic aluminum precursor solution and a carbon-based material are mixed in an inert atmosphere, and low-temperature thermal decomposition is carried out at 50-350 DEG C after a solvent is removed, so that nano aluminum particles are generated on the surface of carbon in situ by organic aluminum. According to the method, aluminum oxidation and aluminum carbide side reaction are effectively inhibited, and uniform dispersion of the aluminum nanoparticles in the carbon matrix is realized. The obtained composite material has a compact aluminum-carbon interface, and shows high reversible capacity, excellent cycling stability and good rate capability when being used as a lithium ion battery negative electrode. The method is simple in process, low in energy consumption and suitable for large-scale production.

Disclosed is a method, system and apparatus for depositing a composite film, comprising providing a substrate in a reaction chamber, depositing a first material layer comprising a first metal nitride according to a first cyclic deposition process, depositing a second material layer comprising aluminum carbide according to a second cyclic deposition process and depositing a third material layer comprising a second metal nitride according to a third cyclic deposition process.

The invention belongs to the technical field of refractory materials. The invention provides a tundish prefabricated member and a preparation method of the tundish prefabricated member. The preparation method comprises the following steps: uniformly mixing 37 to 39 parts of mullite, 24.5 to 26.5 parts of flint clay, 21 to 22 parts of alumina fine powder, 3 to 3.5 parts of activated alumina micro powder, 3 to 3.5 parts of quartz fine powder, 5.7 to 6.5 parts of fused magnesia fine powder, 4.8 to 5.3 parts of silicon dioxide micro powder, 2.5 to 2.8 parts of titanium aluminum carbide, 4 to 4.5 parts of acid-washed silicon nitride and 0.2 to 0.25 part of a water reducing agent to obtain a dry mixture; s2, adding 13-14.5 parts of water into the dry mixture, and continuously stirring to obtain a castable; and S3, pouring the castable into a mold, naturally curing for 24 hours, demolding, curing for 24 hours, and drying, thereby obtaining the product. According to the method disclosed by the invention, the thermal-state breaking strength at 1400 DEG C is improved while excellent thermal-state breaking strength at 1200 DEG C of the prepared (tundish permanent lining) castable sample is ensured.

The application discloses a preparation method of superfine aluminum-magnesium carbide composite powder, which comprises the following steps: mixing aluminum powder and graphite powder, and grinding the mixture into a first substance in which carbon is in aluminum in a ball mill; adding magnesium powder into the first substance and continuously ball milling to prepare a second substance; and annealing the second substance to obtain the superfine aluminum-magnesium carbide composite powder material. The preparation method solves the problems of the aluminum carbide particles, such as air absorption and poor interface with the magnesium matrix, and makes the aluminum carbide particles have good wettability with the magnesium liquid. The superfine aluminum-magnesium carbide composite powder material solves the problem of high surface energy of the nano particles and easy agglomeration, and makes the aluminum carbide more easily dispersed in the magnesium liquid, so that the mechanical properties of the magnesium alloy are greatly improved. In addition, the ball milling time required by the method is short, and the chemical reaction temperature of carbon and aluminum is low, so that the energy consumption and time consumption of the method are lower than those of the prior art, and the aluminum powder in which carbon is solid-solved is fully converted into aluminum carbide, and the superfine powder is formed.

This method uses carbon-containing refractories, including magnesia, as a starting material to produce recycled magnesia refractory raw materials in which aluminum carbide is removed while suppressing the formation of brucite, and graphite is removed while reducing energy consumption compared to conventional technologies. [Solution] A method for producing recycled magnesia refractory raw material, comprising a heating and pressurizing step of heating and pressurizing a carbon-containing refractory material containing magnesia in a steam atmosphere to obtain a treated material, and a graphite removal step of removing at least graphite particles from the treated material.

The invention provides a high-thermal-conductivity diamond / aluminum composite material, a preparation method of the high-thermal-conductivity diamond / aluminum composite material and the high-thermal-conductivity diamond / aluminum composite material prepared through the method. Wherein the diamond / aluminum composite material comprises diamond particles and an aluminum-silicon alloy, and the volume fraction of the diamond particles in the diamond / aluminum composite material is 20%-80%; and the volume fraction of the metal aluminum-silicon alloy is 20-80%. The aluminum-silicon alloy is subjected to liquid-phase sintering, aluminum-silicon alloy powder serves as a matrix, silicon is well combined with the aluminum matrix through diffusion, generation of harmful interface product aluminum carbide is reduced, the phenomenon of selective combination of diamond and an aluminum interface is weakened, the interface bonding strength is enhanced, meanwhile, the phenomenon of interface heat conduction acoustic mismatch is easily weakened, and the service life of the diamond is prolonged. The interface high thermal resistance is reduced, and the thermal conductivity and thermal stability of the composite material are improved.