829results about How to "Reduce porosity" patented technology

The invention relates to the technical field of nano ceramic materials, and discloses a high-strength nano aluminum oxide ceramic product and a preparation process thereof.The preparation process comprises the following preparation steps that aluminum oxide powder, a composite binder, composite gel, a plasticizer and a solvent are mixed and subjected to ball milling, and composite slurry is obtained; placing the composite slurry in a mold, and performing mold pressing and drying to obtain a green body; and putting the green body into a high-temperature sintering furnace, carrying out high-temperature sintering, and cooling to room temperature to obtain the nano aluminum oxide ceramic product. Nano zirconium oxide and nano magnesium oxide are formed on the surfaces of the pretreated silicon carbide whiskers, and can form a solid solution with nano aluminum oxide in the sintering process to serve as a bridge of the silicon carbide whiskers and nano aluminum oxide particles, so that the binding force of the silicon carbide whiskers in a nano aluminum oxide ceramic matrix is remarkably enhanced; phosphoric acid and aluminum ammonium sulfate are firmly combined on the surfaces of nanometer aluminum oxide particles through carboxymethyl cellulose, and the situation that phosphoric acid and aluminum ammonium sulfate are not firmly combined with the nanometer aluminum oxide particles is avoided.

The invention relates to the technical field of building materials, and particularly discloses high-strength lightweight concrete containing hollow glass beads and a preparation method of the high-strength lightweight concrete. The high-strength lightweight concrete containing the hollow glass beads is prepared from cement, fly ash, carbon fiber grafted hollow glass beads, lightweight sand, deionized water, polypropylene fiber grafted rubber particles and a water reducing agent according to the mass ratio of (58-75): (25-38): (45-65): (20-40): (42-55): (35-55): (5-12) through mixing, mold filling, vibration molding, covering and demolding. The addition amount of the hollow glass beads is strictly controlled, the influence on the overall strength of the concrete is avoided, the density and weight of the concrete are reduced due to the addition of the light sand and the hollow glass beads, the compactness and integrity of the concrete are improved due to the synergistic effect of the two added fibers, and the raw materials have excellent cohesiveness; the concrete can effectively absorb and disperse stress, and has the advantages of excellent strength, light weight, good durability and excellent comprehensive performance.

The invention discloses a high-strength short fiber carbon ceramic brake disc and a preparation method thereof, and the preparation method comprises the following steps: carrying out ball milling on silicon powder and carbon powder, mixing with thermosetting resin powder and thermoplastic resin powder, uniformly mixing carbon fiber and a coupling agent, adding the mixed powder, and uniformly mixing again. According to the short fiber carbon ceramic brake disc provided by the invention, the ball-milled silicon powder and carbon powder are uniformly dispersed in the matrix, meanwhile, the thermoplastic resin with good fluidity is added to form a network structure in the matrix, through holes are formed after carbonization, and the high-strength short fiber carbon ceramic brake disc is obtained. Silicon steam can enter in the ceramization process, and the problem that the carbon-ceramic composite material which is high in fiber content and large in thickness and formed at high temperature and high pressure is difficult to infiltrate can be effectively solved. The carbon-ceramic short fiber brake disc prepared by the method is low in aperture ratio and high in impact strength.

The invention relates to the technical field of semiconductors, in particular to a preparation method of a graphite piece containing a tantalum carbide coating, which at least comprises the following steps: preparing a slurry suspension containing a tantalum source, a carbon source, a sintering agent, a dispersing agent and an adhesive; coating the surface of a graphite piece with the slurry suspension, and drying to form a pre-coating layer; the pre-coating layer is subjected to high-temperature sintering, the tantalum carbide coating layer is formed after natural cooling, the grain size of the tantalum carbide coating layer is 30-90 microns, the tantalum carbide coating layer graphite piece which is high in bonding strength, large in grain size and of a porous structure is obtained through slurry suspension preparation, graphite coating and high-temperature sintering, operation is easy, the production cost is low, and the actual application requirement is better met.

The invention discloses a stainless steel laser welding parameter optimization method based on a dynamic annular scanning path. The stainless steel laser welding parameter optimization method comprises the steps that S1, welding parameter setting is initialized to be suitable for controlling welding heat distribution; s2, measuring the material thickness of the welding area of the stainless steel workpiece before welding; s3, the scanning path layer number and the progressive speed are determined according to the welding parameters; s4, the welding control system adjusts welding parameters according to the temperature monitoring data; s5, the laser welding control system adjusts the layer number, the progressive speed and the scanning path radius of the dynamic annular scanning path in real time; s6, the scanning amplitude, the scanning frequency and the welding speed are optimized in real time; and S7, after welding is completed, quality detection is conducted on a welding seam, and detection data are compared with a preset welding quality standard. According to the method, accurate control over welding heat input, remarkable improvement of the welding seam quality and comprehensive optimization of the welding efficiency are achieved.

The invention provides an ultrahigh-ductility cement-based composite material for ocean engineering and a preparation method of the ultrahigh-ductility cement-based composite material for ocean engineering. The concrete is prepared from the following raw materials in parts by weight: 250 to 500 parts of cement clinker, 400 to 600 parts of fly ash, 200 to 300 parts of mineral powder, 100 to 150 parts of silica fume, 160 to 240 parts of metakaolin, 600 to 900 parts of quartz sand, 10 to 20 parts of organic synthetic fiber, 20 to 30 parts of organic corrosion inhibitor, 180 to 240 parts of water and 1 to 8 parts of water reducing agent. The organic corrosion inhibitor provided by the invention can be combined with chloride ions to form a passive film, so that the corrosion of reinforcing steel bars and the invasion of the chloride ions into concrete are inhibited, and the durability of the concrete is improved; by regulating and controlling the mixing ratio of the four mineral admixtures and the mixing amount of the synthetic fiber component, the concrete can well consider high strength, high ductility, high durability, high flow state and excellent deformation resistance. The ultrahigh-ductility concrete for ocean engineering, which can meet the toughness requirements of high compression resistance, fracture resistance and impact resistance and the requirements of high chloride ion permeation resistance and steel bar corrosion resistance, can be obtained.

The invention provides a composite exciting agent and application thereof, and relates to the technical field of exciting agents, and the composite exciting agent comprises an alkaline exciting agent, a calcium source exciting agent and an auxiliary exciting component. Industrial solid waste materials such as the slag, the fly ash and the steel slag can work cooperatively in the same system, the gelling performance, the mechanical strength and the durability of the material are remarkably improved, and the purposes of solid waste resource utilization and low-carbon environmental protection are achieved.

The invention relates to the technical field of lithium ion battery materials, and provides a lithium iron phosphate positive electrode material, a preparation method thereof and a lithium battery. The preparation method of the lithium iron phosphate positive electrode material comprises the following steps: performing a first coprecipitation reaction on a first iron source solution and a first phosphorus source solution in the presence of a polymer monomer to obtain an iron phosphate seed crystal; performing a second coprecipitation reaction on the second iron source solution and the second phosphorus source solution in the presence of a polymer monomer and an iron phosphate seed crystal to obtain iron phosphate dihydrate; iron phosphate dihydrate, a lithium source and a carbon source are mixed and then subjected to spray drying, the mixture is placed in a rotary kiln to be sintered, carbon-coated lithium iron phosphate with the large particle size and carbon-coated lithium iron phosphate with the small particle size are prepared at different sintering temperatures respectively, and the carbon-coated lithium iron phosphate with the different particle sizes are mixed according to the mass ratio to obtain the lithium iron phosphate positive electrode material. The lithium iron phosphate positive electrode material has relatively good spherical morphology, so that the lithium iron phosphate positive electrode material has relatively high compaction density and electrical properties after grading.

The invention provides a high-performance all-solid-state sodium ion battery, and belongs to the technical field of power batteries, the sodium ion battery comprises a Prussian white positive electrode, a metal sodium negative electrode and an NASICON type solid electrolyte; preparation raw materials of the Prussian white positive electrode comprise Prussian white, the general formula of the Prussian white is NaxFe [Fe (CN) 6], and x is larger than or equal to 1.8 and smaller than 2.2; the composition of the NASICON type solid electrolyte is NaxZr2-yMySiuPvO12, x is more than 0 and less than or equal to 4, y is more than or equal to 0 and less than 2, u is more than 0 and v is less than 3; in the NaxZr2-yMySiuPvO12, M is at least one of a Zn element, a Mg element, a Cu element, an Al element, a Ni element, a Ga element, a Fe element and a K element. The sodium ion battery has excellent electrochemical performance at room temperature, is high in safety, and is beneficial to commercialized development and application of all-solid-state sodium ion batteries. The invention also provides a preparation method of the high-performance all-solid-state sodium ion battery.

The invention relates to the technical field of concrete preparation, in particular to fiber-reinforced building solid waste recycled aggregate concrete and a preparation method thereof.The preparation method comprises the following preparation steps that S1, recycled coarse aggregate, slag, fly ash and river sand are mixed and stirred according to the proportion, and a cement mixture is obtained; s2, calcining the cement mixture for 2-3 hours to obtain cement clinker; s3, cement clinker, modified fibers, modified graphene oxide and tetrasodium iminodisuccinate are mixed according to the proportion and then poured into a stirrer to be stirred for 5-6 min; and S4, adding water into the stirrer according to the proportion, continuously stirring for 6-10 minutes, and taking out to obtain the fiber-reinforced building solid waste recycled aggregate concrete. According to the invention, the polystyrene fiber and the concrete are connected more tightly by using the modified fiber, and the polystyrene fiber can be subjected to multiple reactions with components in the concrete in an alkaline environment of the concrete to form a stable network structure, so that mechanical indexes such as crack resistance and breaking strength of the concrete are improved.

The invention discloses a graphene composite perovskite manganese oxide polycrystalline ceramic and a preparation method and application thereof, and belongs to the technical field of non-refrigeration high-sensitivity infrared detection. The chemical expression of the graphene composite perovskite manganese oxide polycrystalline ceramic is La < 0.81 > (Ca < 0.03 > Sr < 0.16 >) MnO3: Gy, G is graphene, y is the mass fraction of graphene in perovskite manganese oxide composite powder, and y is equal to 0.1-0.2%. The TCR value of the prepared polycrystalline ceramic can reach 30% or above, the Tk value is close to 300K, the polycrystalline ceramic has excellent adaptability to room temperature work and excellent sensitivity to temperature change, and when the polycrystalline ceramic is applied to an uncooled infrared detector, the detection precision of the uncooled infrared detector can be effectively improved.

The invention provides a concrete admixture with sulfate corrosion resistance and rust resistance functions. The concrete admixture is prepared from the following raw materials in parts by weight: 50-65 parts of fly ash, 8-12 parts of barium carbonate, 8-12 parts of barium hydroxide, 8-12 parts of mineral powder, 5-8 parts of modified hydrotalcite or hydrotalcite, 1-3 parts of nano silicon dioxide and 1-3 parts of calcium nitrite. Nano silicon dioxide is adopted as a compact component, the porosity of the material is reduced, the compactness of concrete is improved, sulfate in the environment is inhibited from being transmitted into the concrete, meanwhile, hydrotalcite is modified by polymaleic acid serving as a scale inhibition component, and the scale inhibition effect is improved through the dual effects of high adsorbability and slow release of the scale inhibition component of hydrotalcite. The preparation method has the advantages that generation of ettringite and gypsum in a sulfate radical environment is inhibited, calcium nitrite is added as a corrosion-inhibiting component, a protective film is formed on the surface of a reinforcing steel bar, the corrosion phenomenon of the reinforcing steel bar in a concrete structure is inhibited, and finally, the concrete admixture with sulfate corrosion resistance and corrosion-inhibiting functions is formed through compounding.

The invention discloses a preparation method of a ceramic particle reinforced high-temperature alloy wear-resistant coating of a boiler water-cooled tube. The preparation method comprises the following steps: carrying out roughening treatment on a matrix; the prepared NiCr powder and ZrB2 powder are subjected to high-energy ball milling and mixing, drying is conducted after treatment, and dried NiCr-based composite powder is obtained; niCr-based composite powder is sprayed through atmospheric plasma, and a composite coating with the thickness ranging from 200 micrometers to 300 micrometers is deposited on the roughened surface of the base body; the composite coating is subjected to remelting treatment, and a remelting coating is formed on the surface of the base body; wherein the matrix is 304 stainless steel, and the composition proportions of the NiCr powder and the ZrB2 powder are as follows: 80-99 wt% of NiCr and 1-20 wt% of ZrB2 respectively; by means of the method, the wear resistance of the coating is remarkably improved, and controllable deposition of the high-performance ceramic particle reinforced high-temperature alloy wear-resistant coating is achieved.

The invention discloses a super-wear-resistant super-hydrophobic coating in the technical field of coatings, the super-wear-resistant super-hydrophobic coating comprises a primer and a finishing coat, the primer comprises solvent-free aliphatic polyether polyol resin, micro-powder particles, di-tetratoluene diisocynate, fumed silica nanoparticles and a primer magnetic attraction material; the finishing paint comprises hydrophobic nanoparticles, a diluent, a finishing paint magnetic attraction material and a hydrophobic treatment agent, the primer magnetic attraction material is ferrite powder, and the finishing paint magnetic attraction material is nickel powder. The preparation method comprises the following steps: 1, preparing the primer; secondly, primer is sprayed; step 3, roughening the primer; 4, finish paint is manufactured; step 5, spraying finish paint; and step 6, detecting the performance of the coating. The preparation method is scientific and reasonable, the uniformity and stability of the coating in the preparation and coating process are ensured by optimizing the composition of the coating material, improving the preparation process and introducing a magnetic suction device, and therefore the wear resistance, hydrophobicity and adhesive force of the coating are improved.

The invention provides magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete is prepared from the following raw materials in parts by weight: 10-20 parts of phosphate, 30-50 parts of active magnesium oxide, 0.5-3 parts of a retarder, 5-15 parts of a mineral admixture, 0.5-4 parts of a functional additive, 20-30 parts of fine aggregate, 2-5 parts of reinforced fibers and 10-28 parts of water. The invention also provides a preparation method of the magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete provided by the invention has a multi-layer anti-corrosion barrier, a compact microstructure, an intelligent ion barrier and good environmental adaptability, and can meet the use requirements in complex and severe environments.

The invention relates to multifunctional self-adaptive laser metal 3D printing equipment and a control method thereof.The device comprises a spray head bottom plate and a laser cladding spray head, the laser cladding spray head comprises a spray nozzle used for outputting powder and a pipeline connected to the spray nozzle and used for conveying the powder, and a first converging assembly is installed on the spray head bottom plate; the end, away from the nozzle, of the pipeline is arranged on the inner side of the first gathering assembly, the powder is magnetized when passing through the first gathering assembly in the pipeline, and a gathering processing assembly used for repelling the magnetic powder is arranged on the outer side of the nozzle. Through the design of the first gathering assembly and the gathering processing assembly, powder is magnetized through the first gathering assembly during conveying, then the magnetized powder and the gathering processing assembly generate like-pole repulsion acting force when the powder is sprayed out of the nozzle, the powder is promoted to be gathered together to form a powder beam, powder divergence and irregular arrangement are reduced, and the powder quality is improved. And the position precision and the forming quality and precision of powder conveyed to the molten pool are improved.

The invention relates to the technical crossing field of polyphenylene sulfide fiber paper, special papermaking and insulation paper, in particular to high-temperature-resistant polyphenylene sulfide fiber composite insulation paper and a preparation process thereof. The high-temperature-resistant polyphenylene sulfide fiber composite insulation paper with a dense structure similar to reinforcing steel bar-mortar is prepared by preferably selecting the polyphenylene sulfide fiber with higher cost performance as a raw material and taking the aramid fibrid as a filling agent and an adhesive and adopting a wet papermaking process. The prepared composite paper has excellent temperature resistance and chemical corrosion resistance, the production process flow is short, the production process is free of pollution, the industrial production cost of the composite paper can be reduced, the temperature resistance and chemical stability of medium-and-low-end application insulation paper are improved, the application field of the composite paper in a more severe environment is widened, and the composite paper has good application prospects. Good economic benefits and application values are realized.

The invention relates to the technical field of circuit board manufacturing, and provides a circuit board manufacturing method and a circuit board, and the method comprises the steps: electroplating a golden finger on a production board through an electroplating lead; covering selective printing ink on the part of the electroplated lead and the golden finger; forming at least one finished board on the production board along the routing forming line; carrying out bevel edge processing on the finished board; covering an OSP film on the finished board; and removing the selective ink. According to the circuit board manufacturing method, after the golden finger is electroplated, the part of the electroplated lead and the golden finger are covered with the selective ink, and the selective ink is removed after the OSP process, so that the ratio of the area of the exposed gold layer to the area of the nickel layer and the copper layer at the bevel edge in the OSP process is small, that is, the galvanic effect is not obvious, and the nickel layer and the copper layer are slightly corroded; and the risk that the nickel-gold layer tilts and falls off is reduced, so that the risk of short circuit is reduced.

The invention relates to the technical field of basalt concrete, in particular to basalt ultra-high performance concrete and a preparation method thereof, the preparation method comprises a raw material screening method and a preparation method, and the raw material screening comprises the steps of (1) selecting ultra-high performance concrete water, (2) selecting a cementing material, (3) selecting aggregate and (4) selecting fiber. The preparation method comprises the following steps: (1) the use amount of water should meet the design specification of the ultra-high performance concrete, and the water-binder ratio should be controlled within 0.25; and (2) according to the particle sizes of the cementing material and the sand, the dosage of each component is calculated on the basis of the closest packing theory, and the sand-cement ratio is controlled within 1.1-1.4. By adopting the method, in-situ utilization of the raw materials of the ultra-high-performance concrete can be realized in volcanic diagenetic regions, and design, preparation and application of the basalt ultra-high-performance concrete can be realized in practical engineering.

The invention belongs to the technical field of geotechnical engineering, and particularly relates to a nanocarbon reinforced superfine cement-based blocking material as well as a preparation method and application thereof. The superfine cement-based blocking material prepared by the invention is prepared by uniformly mixing 45-50 parts of cement, 0.5-2.5 parts of a solid waste sintered active material, 0-0.05 part of a water reducing agent, 0.015-0.1 part of carbon nanotubes, 0.5-2.5 parts of a 1% solution of carbon quantum dots and 45-50 parts of water. The material has relatively low porosity and is not dispersed; the high groutability is achieved, and the material can permeate into tiny holes; and it is guaranteed that the material has high strength, the crushed rock bonding and reinforcing strength is high, and the material has wide application prospects.

The invention discloses a corrosion-resistant neodymium-iron-boron magnet and a preparation method, and belongs to the technical field of neodymium-iron-boron magnets, and the preparation method of the corrosion-resistant neodymium-iron-boron magnet is characterized by comprising the following steps: S1, uniformly mixing neodymium-iron-boron powder obtained by jet milling with alloy nano-powder, and sieving to obtain a mixed material, wherein the adding amount of the alloy nanometer powder is 0.2-0.8% of the weight of the neodymium iron boron powder; s2, compression molding: carrying out compression molding and oil isostatic pressing on the mixed material to obtain a pressed blank; s3, sintering molding: sintering the pressed blank to obtain a neodymium-iron-boron magnet; s4, carrying out pretreatment on the neodymium-iron-boron magnet; and S5, preparing a coating solution, stirring and mixing silane, a solvent and water according to the weight ratio of 1: (0.8-1.2): (2.2-2.8) to prepare a silane hydrolysate, then adding zinc and aluminum sheet-shaped powder, uniformly stirring and mixing, spraying, and drying to obtain the corrosion-resistant neodymium-iron-boron magnet, thereby achieving the effect of improving the corrosion resistance of the neodymium-iron-boron magnet.

The invention provides a titanium alloy surface antifouling corrosion-resistant coating as well as a preparation method and application thereof. The antifouling and corrosion-resistant coating on the titanium alloy surface is prepared from raw materials including titanium-based composite powder, the titanium-based composite powder comprises titanium alloy powder and copper powder, the content of the titanium alloy powder in the titanium-based composite powder is 93 wt%-97 wt%, and the content of the copper powder in the titanium-based composite powder is 3 wt%-7 wt%. Through introduction of the copper element, the phase composition and microstructure of the alloy can be changed, formation of a beta phase is promoted, the ratio of an alpha phase to the beta phase is changed, the compactness and uniformity of a coating are effectively improved, and the corrosion resistance of the surface of the titanium alloy is remarkably improved. The invention further provides a preparation method and application of the antifouling and corrosion-resistant coating on the titanium alloy surface.

The invention discloses a welding device for chemical container barrel assembly production, and belongs to the technical field of welding equipment.The welding device comprises a welding box, an inner welding mechanism, an outer welding mechanism and two sets of positioning mechanisms are arranged in the welding box, and the two sets of positioning mechanisms are arranged on the two sides of the outer welding mechanism; the outer welding mechanism comprises a welding frame and an arc-shaped seat, a round hole is formed in the welding frame, and the arc-shaped seat is slidably connected into the round hole; the inner welding mechanism comprises a fixed frame, a movable frame and a mounting disc. The other side of the mounting disc and one side of the arc-shaped base are both connected with welding assemblies. The welding assembly comprises a fixing plate, a mounting plate and a welding gun. Automatic and synchronous welding work of the inner ring and the outer ring of the barrel can be achieved through the inner welding mechanism and the outer welding mechanism, the power and the cooling rate of the welding gun can be automatically adjusted through the linkage mechanism and the adjusting mechanism according to the moving line of the welding gun relative to a workpiece, and uniform and efficient welding work is guaranteed.

The invention relates to a Cr-Mo-containing 5.5 Ni steel plate for an LNG (Liquefied Natural Gas) storage tank and a manufacturing method of the Cr-Mo-containing 5.5 Ni steel plate. The steel plate comprises the following chemical components in percentage by mass: 0.03-0.05% of C; 0.15% to 0.30% of Si; mn: 1.20% to 1.30%; p: < = 0.005%; s: < = 0.002%; al: greater than or equal to 0.020%; the content of Ni is 5.00 to 6.00 percent; 0.30% to 0.50% of Cr and Mo; h < = 1 ppm; 0.10% or less of As + Sb + Bi + Sn + Pb; and the balance of Fe and inevitable impurities. The invention relates to a 5.5 Ni steel plate for an LNG (Liquefied Natural Gas) storage tank, in particular to a steel plate for a pressure vessel with the thickness of 5-50mm and the temperature of minus 196 DEG C. A converter is used for production, and the delivery-state mechanical properties and process properties of the obtained steel plate meet the following requirements: the tensile strength Rm of transverse and longitudinal samples of the steel plate is 690-820 MPa, the yield strength Rel is greater than or equal to 590 MPa, and the elongation A is greater than or equal to 21%; at the temperature of-196 DEG C, the impact absorption energy KV8 of the transverse and longitudinal impact sample is greater than or equal to 100J; the sample is bent at normal temperature under the condition that D is equal to 2a and b is equal to 2a, the bending angle is 180 degrees, and no crack exists.

The invention relates to the technical field of welding materials, in particular to a high-efficiency deposited nickel-based welding wire capable of preventing welding cracks based on phase regulation and application of the high-efficiency deposited nickel-based welding wire, and the nickel-based welding wire comprises the following chemical components in percentage by weight: less than or equal to 0.03% of C, 0.10-0.20% of Si, 2.9-3.2% of Mn, and 1t of P; 0.005%, S: lt; 0.003% of Cu, 19.7-20.5% of Cr, less than or equal to 0.04% of Co, and 1t of Cu; the Ni-based alloy comprises the following components in percentage by weight: 0.10% of Ni, 0.3-0.6% of Ti, 0.4-2.0% of Fe, 2.1-2.9% of Nb, less than or equal to 0.3% of Mo, less than or equal to 0.01% of N, less than or equal to 0.005% of O, less than or equal to 0.50% of other impurity elements and the balance of Ni. The specific value of Ti to Nb is controlled to be 0.10-0.22, the specific value of C to Nb + Ti is controlled to be 0.012 or below, appropriate morphology and distribution of (Nb, Ti) C type intergranular precipitates are obtained, precipitation of grain boundary M23C6 is reduced, and the creep resistance and high-temperature deplasticity crack resistance of the material are effectively optimized.

The invention provides a capillary crystalline waterproof agent, a preparation method and application, and the capillary crystalline waterproof agent comprises the following raw materials in parts by weight: 80-100 parts of a non-cement-based cementing material, 15-25 parts of an alkali activator, 1.5-2.5 parts of a thickener, 12.5-22.5 parts of a flexibilizer, 0.1-0.3 part of a dispersant and 5-10 parts of a water reducer, the flexibilizer is formed by mixing carboxyl-terminated liquid rubber modified epoxy resin and inorganic ceramic particles according to the mass ratio of 7: (3-5), and the dispersing agent is alkylphenol polyoxyethylene ether. Under the action of the dispersing agent, the toughening agent can be uniformly dispersed in the concrete, so that the overall toughness of the concrete is improved. The improvement of the overall toughness not only can bear deformation or shrinkage cracking of the concrete caused by evaporation of moisture, temperature difference and external stress, but also can better resist cracking from the source, reduce cracks and pores, prevent moisture from permeating and improve the impermeability of the concrete; and the bending resistance of the concrete after complete water permeability and self-healing can also be improved.

The invention belongs to the field of cement pouring, and particularly relates to cement pouring equipment for cement product production, which comprises a base, a supporting column is fixedly connected to the top of the base, a top plate is fixedly connected to the top of the supporting column, a pouring structure is arranged on the top plate, a through groove is formed in the top plate, and the pouring structure comprises a motor I; a first motor is fixedly connected to the outer wall of the top plate, a threaded rod is fixedly connected to the output end of the first motor, a movable block is in threaded connection to the outer wall of the threaded rod, and a stirring box is fixedly connected to the top of the movable block. According to the cement pouring equipment for cement product production, a bidirectional threaded rod is driven by a third motor to rotate, so that two sets of clamping plates move oppositely, pouring molds of different sizes can be rapidly clamped, then the bidirectional threaded rod rotates reversely through reverse rotation of the third motor, clamping of the pouring molds is conveniently and rapidly relieved, and the production efficiency is improved. The working efficiency is improved, and the stability in the pouring process is ensured.

The invention relates to a method for improving the binding force of a neodymium-iron-boron magnet coating and application. The method comprises the steps that rare earth hydroxide suspension liquid is prepared; spraying double surfaces of the neodymium-iron-boron magnet; and carrying out grain boundary thermal diffusion treatment. According to the method, the rare earth hydroxide is pyrolyzed into the rare earth oxide to be deposited on the surface of the sintered neodymium-iron-boron magnet, the diffusion depth of heavy rare earth elements in the magnet can be effectively increased, and the components and thickness of the coating are accurately controlled; the cost of preparing the rare earth oxide from the rare earth hydroxide is saved, the preparation process of the diffusion source is simplified, and the spraying efficiency is high; the obtained coating is high in quality and low in porosity, and the bonding strength of a diffusion source and a magnet interface is high; subsequent grain boundary diffusion can be promoted, and a new thought is provided for industrial application of the grain boundary diffusion technology.

The invention provides a silver paste composition and a preparation method and application thereof. The silver paste composition comprises the following components in parts by weight: 80-120 parts of silver-containing filler, 20-40 parts of an organic solvent, 5-15 parts of a non-noble metal auxiliary agent with an atomic number of 24-30, 8-10 parts of a peroxide organic auxiliary agent and 1-5 parts of a rheological agent, the silver-containing filler comprises elemental silver powder and a silver-containing compound, and the weight ratio of the elemental silver powder to the silver-containing compound is (18-20): 1; the elemental silver powder comprises micron-scale silver powder and nano-scale silver powder; the silver-containing compound is selected from one or more of silver carbonate, silver lactate, silver formate, silver citrate and silver oxide. According to the low-temperature pressure sintered silver paste composition, low-temperature and low-pressure sintering of the silver paste composition is achieved by adding nano-scale and micron-scale silver powder, a metal precursor, a non-noble metal auxiliary agent and the like.

The invention discloses a coated diaphragm and a preparation method thereof, and belongs to the technical field of lithium batteries. The coated diaphragm comprises a base film and a coating layer, the coating layer is attached to at least partial area of the base film, and the coating layer comprises a covalent triazine framework; a covalent triazine framework is used as a component of a coating layer, the covalent triazine framework is a porous organic polymer which is good in stability, ordered in structure, strong in polarity, large in specific surface area and controllable in pore diameter, and the thermal stability of the coated diaphragm can be improved due to the good stability of the covalent triazine framework; the relatively small mass density does not have obvious influence on the energy density of the battery; due to the high specific surface area and the strong polarity, the affinity of the diaphragm to an electrolyte can be improved, and the diaphragm has higher liquid absorption and liquid retention capabilities; the nano-scale pore structure can inhibit anion migration, reduce internal polarization of the battery, improve the capacity of the battery and prolong the cycle life of the battery, thereby achieving the effect of improving the comprehensive performance of the battery.