34results about How to "Increased mechanical occlusion" patented technology

The invention discloses a stone aggregate wrapped by a microfine fibre polymer mortar thin layer and a preparation method thereof; the stone aggregate is formed by stone aggregate inner cores, an adhesive inner wrapping layer, a polymer cement mortar outer wrapping layer and an adhesive microfine fibre hair layer, wherein the adhesive inner wrapping layer and the stone aggregate are adhered firmly; microfine fibre filaments are anchored and rooted on the adhesive inner wrapping layer; and the polymer cement mortar outer wrapping layer and the adhesive inner wrapping layer are soluble mutually and can effectively form a whole body. Active powder in the polymer cement mortar outer wrapping layer contains silica fume, zeolite powder, finely-ground mineral slag, pulverized coal ash and the like, and can generate volcanic ash reaction with Ca(OH)2 crystal at the interface position of the set cement so as to generate gelled materials, and further carry out improved treatment on the weakest interfaces of set cement and the stone aggregate in concrete. The modified stone aggregate of the invention has good affinity with the set cement, and has higher binding power with the set cement.

The invention provides a method for connecting plastic and a metal heterostructure. The method comprises the following steps that S1, laser roughening treatment is conducted on the surface of a to-be-connected metal part, and local protrusions and dents are generated on the surface of the metal part, so that a metallic oxide layer is formed; S2, the metal part subjected to laser roughening treatment and a to-be-connected plastic part are hot-pressed, so that the metal part and the plastic part are bonded together; and S3, out-of-focus laser beams are adopted to penetrate through the plastic part so as to reach the interface between the plastic part and the metal part, and the portion, at the interface, of the plastic part is partially melted. According to the method for connecting the plastic and the metal heterostructure, operation is easy, the mechanical engaging and chemical bonding degree of the plastic and metal is increased through the required local protrusions and dents formed on the surface of the metal part and partial heating and temperature control of the interface, tight bonding of the plastic and the metal at the interface is facilitated, and the interface bonding strength and airtightness of the plastic and the metal heterostructure are improved accordingly.

An aramid fibre/epoxy resin composite interface performance improving method relates to a macromolecule material modification processing method. The invention solves the problems that the interface between the prior Kevlar-49 fibre and the prior epoxy resin has weak combination and the fiber surface modification processing method is not suitable for industrialized production. The Kevlar-49 fibre surface modification processing method of the invention is as follows: firstly the Kevlar-49 fibre is dried, then the dried Kevlar-49 fibre and liquid medium are sealed in a glass reactor; under the condition of normal temperature, normal atmosphere and the protection of protective gas, a gamma ray with <60>Co as radiation source is adopted to radiate; the radiation dosage is between 0.1 and 1000 kGy and the radiation dosage rate is between 3 and 7 kGy/h. The invention has the advantages of simple operation, stable technique, reliable product quality, environmental protection and industrialized production. The method of the invention improves the fibre surface energy, thereby improving the combination intensity of the interface between the fibre and the epoxy resin matrix and exerting the comprehensive performance of Kevlar-49 fiber reinforced composite farthest.

The invention relates to the technical field of lithium ion batteries and in particular relates to a lithium ion battery with the high energy density and a preparation method of the lithium ion battery with the high energy density. The lithium ion battery comprises a positive electrode, a negative electrode, an isolation film and electrolyte, wherein the positive electrode comprises a positive current collector, an active material A layer and an active material B layer; the active material A layer is arranged between the positive current collector and the active material B layer; the particle diameter of an active material B is greater than that of an active material A; the weight ratio of the active material A layer to the active material B layer is 0.1-10; the negative electrode comprises a negative current collector, a conductive polymer C layer and a negative film; the conductive polymer C layer is arranged between the negative current collector and the negative film; the thickness of the conductive polymer C layer is less than or equal to 5 microns. The lithium ion battery prepared by adopting the method is relatively high in dynamics performance; the problem of risk of separating lithium out of a thickly-coated system lithium ion battery at the low temperature can be effectively solved. The prepared battery is safe, reliable, and long in cycle life.

The invention provides a method for preparing a graphite-reinforced anti-attrition heat and electricity conduction coating layer by supersonic laser deposition. The method is to synchronously introduce a laser beam in the cold spraying process; and through a radiation effect of the laser, powder particles are softened without being molten, so that the critical deposition speed of powder is lowered, the deposition efficiency of the powder is improved, the bonding force of the coating layer is increased, multiple defects of the coating layer prepared by single cold spraying are solved, the comprehensive performance of a composite coating layer is greatly improved, both economy and environmental protection are achieved, and the idea of green development is quite met.

The invention belongs to the technical field of a building material, and provides fast hardening early strength type composite repair mortar. The mortar is prepared from the following ingredients in percentage by weight: 5 to 10 percent of water, 20 to 30 percent of cement, 1 to 5 percent of silicon ash, 1 to 5 percent of fly ash, 50 to 70 percent of quartz sand, 0.4 to 0.5 percent of compound early strength agents, 0.06 to 0.1 percent of water reducing agents, 1 to 5 percent of rubber powder and 0.06 to 0.8 percent of hybrid fiber, wherein the composite early strength agent is prepared from an ingredient A and an ingredient B; the ingredient A is lithium carbonate; the ingredient B is a mixture of triethanolamine and aluminum sulfate; the quartz sand consists of coarse sand, medium sand and fine sand; and the hybrid fiber consists of basalt fiber and polypropylene fiber. The fast hardening early strength type composite repair mortar solves the problems of reduced strength, high dry shrinkage rate and low bonding strength of the repair mortar in the prior art.

The invention belongs to the technical field of building materials, and provides rapid hardening early strength type composite repair mortar. The rapid hardening early strength type composite repair mortar comprises, by weight, 5%-10% of water, 20%-30% of cement, 1%-5% of silica fume, 1%-5% of fly ash, 50%-70% of quartz sand, 0.4%-0.5% of composite early strength agents, 0.06%-0.1% of water reducing agents, 1%-5% of gelatin powder and 0.06%-0.8% of hybrid fibers. The composite early strength agents comprise components A and components B, the components A are nanometer calcium carbonate whiskers, the components B are mixtures of triisopropanolamine and aluminum sulfate, the quartz sand comprises coarse sand, medium sand and fine sand, and the hybrid fibers include basalt fibers and polypropylene fibers. The rapid hardening early strength type composite repair mortar has the advantage that the problems of strength decreasing, high dry shrinkage and low bonding strength of repair mortar in the prior art can be solved by the aid of the rapid hardening early strength type composite repair mortar.

The invention belongs to the technical field of surface engineering, and relates to a preparation method for a high-strength high-hardness synchronous gear ring coating with a self-lubricating property, in particular to a preparation method for a CFx-BN-Mo2S/Cr3C2-Mo2C-VC synchronous gear ring coating. According to the preparation method for the high-strength high-hardness synchronous gear ring coating with the self-lubricating property, on the basis of the high strength, the high hardness, the wear resistance, the corrosion resistance and the structure stability of a chromium carbide-molybdenum carbide-vanadium carbide material, carbon monofluoride, boron nitride, molybdenum disulfide and a trace amount of WC-10Co-4Cr are added to serve as reinforcing agents, and the reinforcing agents are sprayed to the surface of a synchronous gear ring through a supersonic-speed flame spraying technology; and compared with a traditional synchronous gear ring, the fatigue resistance, the oxidation resistance, the corrosion resistance and the wear resistance are significantly improved, the coating has the very good structure stability and self-lubricating property, and the service life of the synchronous gear ring is greatly prolonged.

The invention provides a method for preparing an aluminum oxide reinforced copper-based wear-resistant, heat-conducting and electric-conducting coating through laser-assisted low-pressure cold spraying. The method comprises the following steps that a laser beam is synchronously introduced in a low-pressure cold spraying process, powder particles are softened but not melted under the irradiation action of laser, a matrix is heated at the same time, the critical deposition velocity of powder is reduced, the deposition efficiency of the powder is improved, the binding force of the coating is improved, and the porosity of the coating is reduced; and irregular aluminum oxide particles are added into the copper powder to enhance the wear resistance of the coating, so that the content of aluminum oxide in the coating is low, the mechanical performance is good, many problems of the copper coating prepared through single low-pressure cold spraying are solved, the wear resistance is greatly improved while the heat conduction and electric conduction performance is kept, the comprehensive performance of the composite coating is good, the resource utilization rate is high, and the green development concept is met.

The invention discloses a surface modification method of aramid fiber and a preparation method of a product thereof. According to the surface modification method, irradiation modification is performed on the aramid fiber in the air by taking ultraviolet light as an irradiation source, and a silane coupling agent KH570 is grafted twice. The surface roughness of the aramid fiber is increased since the surface of the aramid fiber is etched by ultraviolet modification, thereby increasing the surface area of the fiber, enhancing the mechanical bite between the aramid fiber and natural rubber, and increasing the interfacial bonding strength between the aramid fiber and the natural rubber. The irradiation modification can also excite the activity of surface functional groups of the aramid fiber, the active functional groups can be reacted with the silane coupling agent KH570, and the other end of the KH570 contains double bonds which can participate in the vulcanization reaction of the natural rubber, thereby increasing the interfacial adhesion. The surface modification method has the advantages of safety, high efficiency, low pollution, low energy consumption, simple equipment and suitability for industrialized production, and has a good development prospect in the modification of the aramid fiber.

The invention relate to a preparation method of a dopamine modified glass fiber/unsaturated polyester composite material. Acetone is adopted to carry out desizing treatment on a glass fiber raw material, desized glass fiber is put into a dopamine hydrochloric acid solution for soaking, then the glass fiber is taken out and cleaned by deionized water, and dried to obtain modified glass fiber, and the modified glass fiber and unsaturated resin are mixed to prepare the dopamine modified glass fiber reinforced resin composite material. According to the preparation method, the glass fiber is modified by dopamine, the interface structure between the glass fiber and the resin on a microscopic scale is designed, adjusted and controlled, the wettability and the interface bonding strength between the glass fiber and the resin are increased, and the comprehensive performance of the modified glass fiber unsaturated polyester composite material is obviously improved. However, dopamine polymerization conditions are simple, and the environment is relatively mild. The thickness of the dopamine deposited on the surface of the glass fiber is controllable. Therefore, the preparation method is more conducive to the industrial production and wider application of the glass fiber composite material.

The invention discloses a method for improving crankshaft face plasma spraying Mo coating combination strength. The requirement of a large-displacement large-torque motor crankshaft for combination force between a coating and a base body and combination force between the coating and the interior of the coating is higher and higher, WC-10Co-4Cr with the granularity being -30+5 micrometers and the weight ratio being 20 to 40% is added into Mo powder, in the spraying process, WC-10Co-4Cr particles impact a deposited coating by virtue of a certain speed obtained through plasma jet flow spraying, in the impacting process, kinetic energy of the particles is converted into deforming capacity and inner energy of the deposited particles, along with increasing of the impact number of the WC-10Co-4Crparticles, the deforming degree of the deposited coating is larger, the gap between the coating particles is extruded to be small and even the closing probability is larger, the hole shrinkage and crack arresting are achieved, mechanical occlusion between the coating and the base body is enhanced, cohesion between layers inside the coating is increased, the combination strength of the coating isimproved, and is improved to 58 MPa from 36 MPa, and the applying working condition need of a large-diameter crankshaft and large loads can be met.

The invention discloses a method for vacuum brazing connection of a graphite material by using brazing filler metal with added rare earth, belongs to the field of welding of materials, and particularly relates to a connecting method for a graphite material or between a metal material and the graphite material. Firstly, BNi75CrSiB nickel-based brazing filler metal and rare earth Y powder are evenlymixed through a ball-milling method, paste brazing filler metal is prepared through an organic adhesive, related base metal is coated with the paste brazing filler metal to form a base metal/brazingfiller metal/base metal sandwich structure, then the base metal/brazing filler metal/base metal sandwich structure is placed in a vacuum molybdenum sheet furnace, and brazing is conducted. By means ofthe method, the problems that the two-phase thermal expansion coefficient difference is too large, the wettability of brazing filler metal is poor, and the joint performance is poor due to large deformation at the local position of a joint are effectively solved, and related welding of the graphite material is economically and effectively achieved.

The invention belongs to the technical field of sizing agents, and particularly relates to a sizing agent for graphene fibers and a preparation method of the sizing agent.The preparation method comprises the following steps: step 1, taking liquid bisphenol A epoxy resin, adding an emulsifier, heating to 105 DEG C and mixing uniformly, vacuumizing to remove residual moisture, then cooling to 80 DEGC, starting to add a chain extender, and then preserving heat for 6 h to obtain an epoxy resin emulsifier; step 2, mixing the liquid bisphenol A epoxy resin and the epoxy resin emulsifier according to a certain ratio and stirring uniformly, then starting to add deionized water, and continuing to stir when phase transformation begins to occur in a mixed system and adding deionized water at the same time to obtain an epoxy resin emulsion; step 3, adding a graphene aqueous solution to the epoxy resin emulsion, and adding deionized water and fully stirring at the same time to prepare the sizing agent for the graphene fibers.The sizing agent involved in the invention is used for protecting the graphene fibers, optimizing the physicochemical structure of the surface of the graphene fibers, andimproving the interfacial property of the graphene fibers and a polymer matrix material.

The invention discloses an HSC structure with tie bar end anchor connection joints and a construction method. The HSC structure comprises a steel plate and a wall body formed by pouring concrete, the steel plate is located on one side of the wall body, a reinforcing mesh which is in parallel alignment fit with the steel plate is embedded in the other side of the wall body, and the steel plate, the wall body and the main extension face of the reinforcing mesh are parallel to one another; a plurality of tie bars are arranged on the reinforcing mesh, the tie bars and the reinforcing mesh are in linkage in the direction perpendicular to the main extension face of the steel plate, a plurality of studs are evenly welded to the main extension face of the side, facing the wall body, of the steel plate in an array mode, and the free ends of the tie bars are provided with anchor heads which are in lap joint with the studs in an aligned mode and enhance the mutual anchoring effect. The HSC structure with the tie bar end anchor connection joints has a single-side steel plate structure, is simple, convenient and efficient to manufacture and form, is lower in construction difficulty and field workload, and is higher in overall construction efficiency. The invention further discloses a construction method for the HSC structure with a tie bar end anchor connecting joint.

The invention discloses a brake air chamber with a self-locking type parking mechanism. The brake air chamber comprises a front cover assembly, a first middle body assembly, a second middle body assembly, a cylinder body assembly, a push rod disc assembly and a piston assembly; a leather membrane is arranged in first hollow formed by the front cover assembly and the first middle body assembly, thefirst space is divided into two cavities through the leather membrane, the two cavities are a push rod disc assembly cavity and a driving brake cavity, the push rod disc assembly is mounted in the push rod disc assembly cavity, the piston assembly is arranged in a second space formed by the second middle body assembly and the cylinder body assembly, a self-locking mechanism is arranged in the second space, and the piston assembly is arranged between the self-locking mechanism and the cylinder body assembly. Original energy storage strong springs are replaced, parking tasks are finished, safety of the brake air chamber is higher, and the service life is longer.

The invention discloses thermoplastic epoxy resin and application thereof, and a surface modifier for carbon fibers. The thermoplastic epoxy resin comprises a structure as shown in a formula (I) whichis described in the specification, and can be applied as a surface modifier to surface treatment of carbon fibers. The carbon fibers treated by the thermoplastic epoxy resin have better interfacial compatibility with thermoplastic matrix resin, desizing treatment is not needed, influence on the strength loss of the carbon fibers is small, and good application prospects are obtained.

The invention relates to a solid-waste-based maritime work repair material and a preparation method thereof, in particular to a method for preparing the solid-waste-based maritime work repair material by utilizing industrial solid waste, and relates to the fields of physical chemistry, solid waste reutilization, environmental protection and the like. The maritime work repair material is composed of red mud, nickel slag, sulphoaluminate cement, rubber powder, limestone powder, fiber, silica fume, a curing agent and an exciting agent with a mass ratio of (30-60):(10-25):(10-25):(0.5-1.5):(10-20):(0.7-1.3):(4-7):(1-5):(5-10), and the total amount of the components is 100 percent. The maritime work repair material has the characteristics of good seawater erosion resistance, strong bonding capacity and the like, and is suitable for maritime work repair engineering such as cross-sea bridge pile foundation repair and the like.

The invention relates to the field of nylon materials, in particular to a multi-layer modified cast nylon material. The invention discloses a multi-layer modified cast nylon material, which is characterized in that it comprises a plurality of functional layers; the functional layer is one of a wear-resistant layer, a reinforcing layer, an aging-resistant layer and a heat-resistant layer. The invention solves the problem that adding a single component to the existing cast nylon can only slightly increase part of the performance of the cast nylon, and if more complex components are added, the performance of the cast nylon will decrease. Compared with the cast nylon modified by adding various fillers at the same time, the multi-layer nylon material of the invention not only has a plurality ofimproved properties, but also has different properties at different levels, and can meet the requirements of different use positions of parts for different properties.