13results about How to "Tight bond" patented technology

The application discloses a full-wrapping concrete truss structure and a construction method thereof, and belongs to the technical field of building structures. The full-wrapping concrete truss structure comprises a steel pipe truss assembly arranged between a plurality of steel plates, a wrapping assembly arranged outside the steel pipe truss assembly, and a concrete layer arranged outside the wrapping assembly. The construction method comprises the following steps: S1, preparing a top chord, a bottom chord, a vertical rod and a horizontal rod, wrapping the rods with a reinforcing mesh and welding to obtain a steel pipe truss shell; S2, arranging a diagonal web member assembly inside the shell and arranging a connecting mesh outside the shell to form a steel pipe truss monomer; S3, bolt connecting a plurality of monomers and bolt connecting the steel plates and the monomers at edges to form a steel pipe truss structure; and S4, vibrating the steel pipe truss structure after concrete partition pouring to obtain the full-wrapping concrete truss structure. The application can realize full wrapping of the steel pipe, ensure that the concrete layer is tightly bonded with the steel pipe, and improve the stability and safety of the structure.

The invention relates to the field of refractory materials, in particular to a high-strength refractory material and a preparation method thereof, which are used for solving the problem that the existing traditional refractory material is low in strength and difficult to meet the high-standard requirement of modern industry on equipment. The high-strength refractory material comprises the following components: silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride and a phosphorus-containing phenyl multi-epoxy-group binding agent, according to the preparation method, silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide and titanium diboride are taken as main raw materials, the main raw materials are endowed with excellent mechanical properties, and after a phosphorus-containing phenyl polyepoxy binding agent is added, the mechanical properties of the main raw materials can be further remarkably improved, so that the prepared refractory material has the characteristics of high strength, high temperature resistance and the like. The composite material shows high durability and reliability in a high-temperature environment, and is suitable for thermal protection in the high-temperature environment and internal construction of high-temperature equipment.

This invention discloses a high-crack-resistant cement-fly ash stabilized base course material, belonging to the field of road engineering technology. The material comprises the following components by mass percentage: 2.0-3.0% cement, 16-20% fly ash, and the balance being stabilized aggregate. The cement is an external admixture, the fly ash is an internal admixture, and the gradation of the stabilized aggregate conforms to the specifications of CF-A-2L or CF-A-2S in JTG / T F20-2015. This invention, by adopting a "low cement, high fly ash" mix design, controls the 7-day unconfined compressive strength within a reasonable range of 3.5-4.5 MPa, effectively avoiding the problem of regular transverse cracks in the base course caused by excessively high early strength. Simultaneously, the high fly ash content ensures the continuous growth of the material's later strength, with its 21-day unconfined compressive strength remaining stable above 6 MPa. Its overall performance is superior to the mix ratios recommended by current standards. This invention is particularly suitable for highway base course construction in arid regions with large temperature differences, such as Xinjiang.

The present invention relates to the technical field of electronic ceramic substrate materials, and more specifically, to a tape casting slurry, a green porcelain tape and a preparation method thereof. The tape casting slurry of the present invention is made of component A, component B and component C, wherein component A comprises: calcium borosilicate glass powder; component B comprises: solvent, binder, plasticizer and dispersant; component C comprises: one or more of acrylic adhesive, alkane mixture, pre-dispersant and auxiliary agent; the mass ratio of component A, component B and component C is 100:(50-150):(0.02-20). The tape casting slurry provided by the present invention has moderate viscosity and good fluidity, and can obtain a green porcelain tape with uniform film thickness and smooth surface.

The present invention belongs to the technical field of alkali metal ion batteries, and discloses a negative electrode of a lithium / sodium ion battery with a dual gradient structure and a preparation method thereof. The dual gradient negative electrode is a double gradient sandwich structure constructed by a current collector modified with a strong lithium / sodium-philic conductive layer at the bottom of the negative electrode, an active layer in the middle of the negative electrode, and a lithium / sodium-phobic insulating passivation layer at the top of the negative electrode, wherein the bottom of the negative electrode is lithium / sodium-philic and conductive, the middle negative electrode active layer has moderate lithium / sodium-philicity and conductivity, and the top is lithium / sodium-phobic and insulating. By introducing a conductive and lithium / sodium-philic component at the bottom of the negative electrode with a low lithium / sodium nucleation barrier, after the negative electrode active layer accommodates lithium / sodium, it can induce excess lithium / sodium ions to nucleate and grow from the bottom of the negative electrode, avoid lithium / sodium precipitation on the surface of the negative electrode, effectively utilize the lower layer space of the negative electrode, realize dual-phase lithium / sodium storage, and greatly improve the specific capacity and cycle life of the negative electrode. At the same time, the insulating lithium-repellent passivation layer on the negative electrode surface is not only thin, but also well preserves the original pore structure of the negative electrode active layer, and has little effect on the wettability of the electrolyte and the diffusion process of lithium / sodium ions. Moreover, the insulating lithium-repellent property effectively hinders the reduction growth of lithium / sodium on the electrode surface. The synergistic effect of the dual-gradient structure not only greatly improves the specific capacity of the negative electrode through the dual-phase lithium / sodium storage characteristics, but also prevents the occurrence of lithium / sodium precipitation on the surface, significantly improving the cycle performance of the battery.

The invention discloses a preparation method and device of an Anshan basalt stratum grouting material, and relates to the technical field of grouting. Primarily stirring the slurry; shearing and dispersing at high speed; performance detection; and a grouting step. According to the invention, the superfine fly ash microbeads, silica fume and nano-silica are compounded, and a high-speed shearing process is adopted, so that the particle size of the slurry is remarkably reduced, the flowability of the slurry is improved, and the slurry can be smoothly injected into micro cracks of anshan basalt; the main component Portland cement clinker has the characteristics of early strength and micro-expansion; the filling effect of the secondary components silica fume and nano-silica further compacts the structure of the stone body, so that the stone body has high later strength and tight cohesiveness with bedrock; under the synergistic effect of a small amount of hydroxypropyl methyl cellulose and nano silicon dioxide, segregation and bleeding of the slurry are effectively prevented, and it is ensured that the slurry is fully filled in cracks.

The invention provides a preparation method of a high-voltage composite positive electrode, which comprises the following steps: mixing a low-melting-point solid electrolyte or a precursor of the low-melting-point solid electrolyte, a high-voltage polycrystalline positive electrode material and a conductive agent to obtain a composite positive electrode precursor; and carrying out low-temperature heat treatment on the composite positive electrode precursor to melt and permeate the solid electrolyte into the high-voltage polycrystalline positive electrode material, and uniformly adhering the conductive agent to the surface of the positive electrode along with the solidification of the molten electrolyte during cooling to obtain the high-voltage composite positive electrode. The preparation method synchronously solves the problems that internal pores of the high-voltage polycrystalline positive electrode material hinder ion and electron transmission and the polycrystalline morphology of the positive electrode material is easy to break. The invention also provides the high-voltage composite positive electrode prepared on the basis of the preparation method and a solid-state battery comprising the high-voltage composite positive electrode. The solid-state battery based on the high-voltage composite positive electrode is high in utilization rate of active substances and excellent in rate capability and cycle performance.

The invention relates to the technical field of grouting materials, in particular to a high-performance prestressed duct grouting material which comprises water, cement, silica fume, mineral powder, limestone powder, a water reducing agent, microbeads, a plastic expanding agent, a suspension stabilizer and a defoaming agent.The cement, the silica fume, the mineral powder, the limestone powder and the microbeads are used for constructing a multi-element mineral admixture system; the powder materials with different particle sizes are mutually filled, so that close accumulation among particles is realized, and the void ratio among the powder is effectively reduced, thereby reducing the water consumption required for filling gaps and improving the compactness and the homogeneity of the slurry; meanwhile, the water reducing agent efficiently disperses cement particles through the steric hindrance effect, the microbeads reduce the friction resistance in the slurry through the spherical ball effect of the microbeads, the plastic viscosity and yield stress of the slurry are remarkably reduced through the combined action of the water reducing agent and the microbeads, and the slurry is endowed with excellent initial fluidity and long-time fluidity maintaining capacity; and it is ensured that the slurry can be rapidly and smoothly filled in the prestressed duct.

The utility model provides a height-adjustable truncated cone test mold. The height-adjustable truncated cone test mold comprises a base and a splicing mold, the base is of a circular plate structure, and a circle of inserting groove is formed in the upper end face of the base. A plurality of groups of splicing molds are arranged, and each group of splicing molds comprises a mold I and a mold II; the bottom of the first mold is provided with a circle of inserting-connecting protruding blocks matched with the inserting-connecting grooves, and the first mold is detachably arranged on the base. The mold II is detachably spliced on the mold I; the mold I and the mold II are spliced to form a molding cavity with a circular truncated cone structure inside; the total height of the first mold and the second mold in each set of splicing mold after splicing is not larger than 30 mm, and the height of the second mold is 2-10 mm. The height-adjustable truncated cone test mold disclosed by the utility model is simple to operate, high in test piece forming precision and small in error, the thicknesses of all parts of a coating are uniform and consistent, the coating is tightly bonded with basic mortar, and the periphery is smoothly connected; meanwhile, basic mortar test pieces with different heights can be formed, and the requirement for preparing coating test pieces with different thicknesses is met.

The application provides a ceramic capacitor encapsulation process, which comprises the following steps: S1, encapsulating a 0.8mm-1.0mm insulating paint layer on the surface of a ceramic capacitor; S2, coating a 1.6mm-1.8mm hyperbranched epoxy resin layer on the surface of the capacitor obtained in step S1; and S3, coating a 0.4mm-0.6mm bisphenol A type epoxy resin layer on the surface of the capacitor obtained in step S2. The application adopts three different encapsulation materials for three times of encapsulation, simultaneously optimizes the thickness of each encapsulation layer, fully utilizes the characteristics of the three encapsulation materials, can significantly reduce the residual stress of the encapsulation layer, improves the interfacial bonding force between the encapsulation layer and the ceramic capacitor, reduces the cracking risk, improves the stability and reliability of the ceramic capacitor, and further improves the voltage resistance strength of the ceramic capacitor.

The invention belongs to the technical field of pipeline materials, and particularly relates to a composite pipeline material and a preparation method and application thereof. The composite pipeline material comprises an inner surface layer, an inner fiber cloth reinforcement layer, an inner fiber winding layer, a fiber reinforcement structure layer, an outer fiber cloth reinforcement layer, an outer fiber winding layer and an outer protection layer which are sequentially stacked from inside to outside. The inner surface layer is made of epoxy resin; fibers in the inner fiber cloth reinforcing layer, the inner fiber winding layer, the fiber reinforcing structure layer, the outer fiber cloth reinforcing layer and the outer fiber winding layer are basalt fibers; and the outer protection layer is made of epoxy resin. According to the invention, the epoxy resin and the basalt fiber have good electrical insulation performance and shielding performance, so that the pipeline material has a good stray current resisting effect.

This application discloses a fabric for bags and a method for preparing the same, belonging to the technical field of bag fabrics. The bag fabric includes a base layer, an adhesive, and an abrasion-resistant layer. By weight, the abrasion-resistant layer comprises the following raw materials: 60-70 parts PE resin, 15-20 parts modified corn fiber, 4-8 parts coumarone resin, 10-18 parts modified diatomaceous earth, 2-4 parts dioctyl sebacate, 2-6 parts antioxidant, 0.5-1 part calcium stearate, and 1-1.5 parts rosin. The abrasion-resistant layer prepared by this application has good mechanical strength and abrasion resistance. When applied to the surface of the bag fabric, it is not easily worn or torn, thus extending the service life of the bag fabric.

This invention discloses a low-cost, high-density graphitized carbon block and its preparation process, which is prepared from the following raw materials: sponge coke with a particle size of 6-9 mm; sponge coke with a particle size of <0.5 mm; shot coke with a particle size of 0.5-6 mm; shot coke with a particle size of <0.5 mm; and coal tar pitch. The shot coke is calcined at 1300℃-1500℃ for 1-5 minutes and then at 1900℃-2200℃ for 1-5 minutes before being pulverized. This invention extensively utilizes shot coke, which is not used in the traditional production of graphitized cathode carbon blocks, thus solving the bottleneck in shot coke usage and reducing production costs. It employs an optimal particle size ratio of sponge coke and shot coke, as well as a mixing and molding process; combined with a unique calcination temperature rise curve, it achieves excellent strength, thermal conductivity, resistivity, sodium penetration expansion rate, and yield; making it highly suitable as a cathode material for electrolytic cells and fully meeting the needs of low-cost mass production in industrial applications.