8results about How to "Increase nucleation sites" patented technology

The invention relates to the technical field of steel and iron materials and preparation thereof, in particular to extra-thick high-strength and high-toughness rack steel for an ocean platform and a manufacturing method of the extra-thick high-strength and high-toughness rack steel. The sum of the mass percent of the V element and the mass percent of the Nb element in the steel plate element composition ranges from 0.09% to 0.12%; the ratio of the mass percent of the V element to the mass percent of the Nb element is controlled to be 2: 1. A heat treatment process of quenching twice after controlled rolling and high-temperature tempering is adopted, a Ni-Cr-Mo alloying component system is utilized, steel of a tempered martensite structure is obtained, the maximum thickness can reach 210 mm, and the finally obtained steel plate has the yield strength larger than 880 MPa, the tensile strength larger than 1000 MPa, the Charpy V-notch impact energy at the temperature of-60 DEG C larger than 170 J and the percentage elongation after fracture larger than 17%. The steel plate is simple in production process, low in cost, good in structure uniformity in the thickness direction and excellent in obdurability matching, and can be used for manufacturing racks for ocean platforms.

The invention discloses a preparation process of a continuous carbon fiber reinforced PLA composite material for a 3D printing technology, and the preparation process comprises the following steps: S100: preparing raw materials: selecting continuous carbon fibers, PLA particles containing chopped CF, an antioxidant, a coupling agent, a nucleating agent and a lubricant required by production for preparing the composite material; s200, material pretreatment: in order to remove moisture contained in the material, before preparation, taking a certain amount of PLA / chopped CF particles, placing the PLA / chopped CF particles in an electrothermal constant-temperature forced air drying oven, setting a certain temperature, and drying for a certain time. By adding the antioxidant, the coupling agent and the nucleating agent into the raw materials, the resin is modified, nucleation sites are increased, PLA is promoted to crystallize rapidly, and the stability of the material is improved; and the antioxidant and the coupling agent are added to promote effective combination of the resin and the fibers and prevent unnecessary oxidation of the resin under a high-temperature condition at the same time, so that the mechanical property of the composite material is improved.

The invention discloses a poly caffeic acid interlayer MAF-6-based mixed matrix membrane as well as a preparation method and application thereof. The mixed matrix membrane is sequentially composed of a PVDF (Polyvinylidene Fluoride) base membrane, a poly caffeic acid interlayer with MAF-6 grown in situ and a polymer matrix layer dispersed with MAF-6 from bottom to top, the membrane material disclosed by the invention can be effectively applied to the field of alcohol / water separation, has the advantages of simplicity in preparation, environmental friendliness, small required site, high separation efficiency and the like, has excellent pervaporation performance when being applied to ethanol / water separation, and has a good application prospect in future biological alcohol recovery.

The present invention discloses a phase change liquid cooling device for improving the consistency of battery modules, including a porous battery rack, a temperature sensor, a flow guide assembly, an electromagnetic one-way valve, an immersion liquid cooling battery compartment and a pressure sensor. The present invention uses flow boiling technology to greatly improve the heat transfer performance of phase change liquid cooling, achieving a grouping efficiency of more than 90%. The present invention adopts gradient spacing to improve the temperature difference between groups caused by natural convection and heat accumulation effects in the design process of traditional battery modules, and reduces the maximum temperature difference of the battery module to below 2°C, with extremely high temperature consistency. The present invention can overcome the temperature difference of battery cells caused by the boundary layer effect and flow field structure of the working fluid during the immersion cooling design process through the introduction of porous battery racks and flow guide assemblies, thereby further improving temperature consistency.

The application provides a heat-conducting material suitable for local micro heat sources of integrated chips and a preparation method thereof, and the preparation method comprises the following steps: S1, obtaining a topological structure of a heat-conducting filler framework according to the parameters of the local micro heat source; S2, designing an ice template mold, comprising a heat-conducting metal block with a cavity protrusion on the upper surface and a heat insulation plate, the heat insulation plate is covered on the upper surface of the heat-conducting metal block and exposes the cavity protrusion as a cold source; S3, controlling the temperature to form uniform crystal nuclei on the cavity protrusion, adding a heat-conducting filler dispersion liquid, controlling the temperature of the cavity protrusion to be close to the freezing point, directional freezing, forming an ice template-heat-conducting filler composite, freeze-drying, and obtaining the heat-conducting filler framework; and S4, treating the heat-conducting filler framework and a polymer matrix prepolymer by a vacuum impregnation method to obtain the heat-conducting material. The heat-conducting material and method solve the problems of poor heat-conducting strengthening effect, and mismatching between the structure and the heat source of the existing material, and realize efficient reduction of the temperature of the micro heat source.

The invention belongs to the technical field of cementing materials, and particularly relates to an organic-inorganic composite alkali-activated cementing material and a preparation method thereof. The modified wollastonite added into the organic-inorganic composite alkali-activated cementing material has a large amount of silicon hydroxyl (Si-OH), and the groups are high in activity, so that the compatibility and binding force of the wollastonite and the styrene butadiene rubber emulsion can be greatly improved. The modified wollastonite provides CaO and SiO2 at the same time, a hybridization system composed of N-A-S-H gel, C-A-S-H gel and unreacted wollastonite needle-shaped particles is formed, the hybridization system can force cracks to deflect, bypass and branch in the expansion process, more fracture energy is consumed, and therefore the fracture toughness and toughness of the material are improved.

The invention relates to a preparation method of high-porosity ceramic with controllable pore diameter and structure. The preparation method comprises the following steps: taking the following raw materials in percentage by mass: 85-95% of alpha-powder, 0.5-5% of carbon black, 3-6% of camphor, 0.5-2% of powder and 1-3% of MgO powder; mixing and pretreatment: spheroidizing the raw materials by taking absolute ethyl alcohol as a medium to obtain slurry, and drying and sieving the slurry to obtain composite ceramic powder; molding: performing dry pressing molding on the composite ceramic powder to obtain a green body; and rubber discharging and sintering are conducted, specifically, the green body is placed in a high-temperature sintering furnace, heat treatment is conducted under the air atmosphere, and the heat treatment is divided into four steps including the stepped rubber discharging stage, the pre-sintering stage, the final sintering stage and the cooling stage.

The application provides a method for preparing a defect-free MOF membrane by a MOF gradient distribution seeding method. According to the fact that the density of ZIF-8 seeds is greater than the density of a polymer solution, a gradient distribution of the ZIF-8 seeds in a phase inversion membrane is obtained, and abundant nucleation sites are provided for subsequent ZIF-8 layer growth. The distribution of the ZIF-8 seeds in the membrane holes increases the rigidity of the phase inversion base membrane, and simultaneously increases the adhesion of the surface of the base membrane and the ZIF-8 layer. The addition of tannic acid in the ZIF-8 precursor solution assists the growth of the ZIF-8 layer, the tannic acid has abundant hydroxyl groups, provides CO2 groups, and improves the selectivity of the membrane for separating H2 / CO2. The ZIF-8 seeds in the compact defect-free ZIF-8 membrane rich in hydroxyl groups have a gradient distribution, which improves the mechanical properties of the base membrane and the adhesion of the ZIF-8 layer, and the ZIF-8 membrane prepared by directly seeding ZIF-8 seeds on the base membrane shows obvious superiority.