14 results about "Density reduction" patented technology

The invention relates to 1300MPa-grade low-density steel and a hot rolling short-process preparation method thereof, and belongs to the technical field of metal materials and metallurgy. The low-density steel prepared by the invention comprises the following chemical components in percentage by mass: 0.65%-0.75% of C, 5.0%-8.0% of Al, 17.5%-20.0% of Mn, 0.40%-0.50% of Si, 0.10%-0.40% of Nb, 0.10%-0.20% of Mo, 0.10%-0.28% of V, 1.0%-3.5% of Ni, 0.10%-0.30% of Ti, 0.001%-0.003% of B, less than or equal to 0.008% of P, less than or equal to 0.020% of S and the balance of Fe and inevitable impurities. According to the preparation method, the steel forms a stable high-strength structure state in a hot rolling state while the density of the steel is reduced, the strength and plasticity of the steel plate are coordinated and matched, and the preparation process of the steel plate is simplified.

The invention relates to the technical field of powder metallurgy, and particularly discloses a lubricant-containing composite composition for warm-pressing powder metallurgy. The composition comprises the following components in percentage by mass: medium-high molecular weight polycaprolactone, a low-melting-point organic lubricant component, a solid lubricating phase, polysiloxane powder and the balance of iron-based powder. Wherein the polycaprolactone is softened to form a film in the medium-temperature stage of warm-pressing forming, and continuous lubrication and compact strength are provided; the low-melting-point organic lubricant melts and wets the powder in the low-temperature stage, and the initial fluidity is improved; the solid lubricating phase forms a stable boundary layer in a high-temperature stage to prevent mold sticking; and the polysiloxane powder can construct an elastic buffer film layer in the forming and demolding stages, so that the demolding resistance is remarkably reduced. The composition disclosed by the invention can be used for remarkably improving the density of a pressed blank, reducing friction and abrasion, improving the surface quality of a product and prolonging the service life of a mold, is suitable for warm-pressing manufacturing of a high-density iron-based gear and a complex special-shaped part, and has excellent environment-friendly characteristic and industrial application prospect.

The invention discloses a double-sided wave-absorbing continuous alumina fiber reinforced alumina composite material compatible with infrared stealth and a preparation method thereof, and belongs to the technical field of stealth materials. According to the double-sided wave-absorbing continuous alumina fiber reinforced alumina composite material compatible with infrared stealth, on the premise that the strength of the continuous fiber alumina fiber reinforced alumina composite material is guaranteed, the relative dielectric constant of a composite material body is reduced by controlling the porosity (the density of the composite material); and the frequency selective surface layer and the resistance type metamaterial layer are arranged, so that the thin double-sided wave-absorbing continuous fiber alumina fiber reinforced alumina composite material is obtained, and meanwhile, the material has relatively low infrared emissivity.

The utility model discloses a fused material extruding mechanism which comprises a runner wheel support, a support connecting plate is installed on the runner wheel support, at least one wheel runner fixing frame is fixed to the lower end face of the support connecting plate, the wheel runner fixing frame is connected with a wheel runner through a rocker, and the wheel runner rotates in the fixed direction to extrude materials. The method has the beneficial effects that the use of an adhesive can be reduced, the material viscosity is increased, the material density is improved, and the production cost of cold-pressed balls is reduced.

A thermoplastic foam article comprising a thermoplastic polyurethane composition. The thermoplastic polyurethane composition includes a blowing agent and a nucleating agent. The thermoplastic polyurethane foam article has an average density reduction or porosity greater than 10%.

The utility model discloses an underwater communication wireless optical signal transmitting device, which comprises a transmitter main body, fixing rings are arranged on two sides of the surface of the transmitter main body, mounting seats are mounted on the front sides and the rear sides of the bottoms of the fixing rings, counterweight plates are mounted at the bottoms of the mounting seats, and the transmitter main body comprises a shell. The shell has the advantages that the strength layer has the excellent performance of bearing impact, extrusion, material abrasion and the like, the use strength and abrasion resistance of the shell are improved, the use strength and corrosion resistance of the shell are improved, and the effects of high temperature resistance, corrosion resistance and the like of the shell are improved; and the paint does not contain heavy metals, meets the environmental protection standard, is suitable for stainless steel and aluminum alloy surfaces, has stable chemical properties, hard texture, fine particles and excellent filling property, improves the density of a paint film, reduces the permeability of the paint film, and thus, plays a role in rust prevention.

This invention discloses a laser cutting method, which includes hot-pressing a structure to be cut, applying an adhesive to a predetermined cutting area of ​​the hot-pressed structure, and finally cutting the hot-pressed and adhesive-coated structure using a laser cutting method. Through these steps, this invention improves the density of the structure to be cut, reduces the surface area exposed to oxygen, and effectively prevents discoloration or even shrinkage of the material due to high-temperature burning during the cutting process. This improves the smoothness and aesthetics of the cut of the final product, resulting in a higher yield rate.

A polyarylene sulfide (PAS) foam layer that circumscribes a hollow inner tube and may have a 50% or greater density reduction relative to the density of an un-foamed PAS polymer material and / or a 50% or greater thermal conductivity reduction relative to the thermal conductivity of an un-foamed PAS polymer material and / or 50% or greater thermal effusivity reduction relative to the thermal effusivity of an un-foamed PAS polymer material. The PAS foam layer may have a low density (e.g., less than 0.67 g / cc) and / or a low thermal conductivity (e.g., anywhere from 0.017 W / (m-K) to 0.145 W / (m-K)) and / or a low thermal effusivity (e.g., less than 316 Ws1 / 2 / m2 / K, optionally anywhere from 38 Ws1 / 2 / m2 / K to 316 Ws1 / 2 / m2 / K) even at high temperatures (e.g., above 400 degrees Fahrenheit (° F.) (about 204 degrees Celsius (° C.)). Such a PAS foam layer may have characteristics appropriate for use as part of a steam hose.

This invention relates to the field of polymer materials and discloses a lightweight noise-reducing foam component for automotive interiors and its preparation method. The invention aims to solve the technical problems of reduced sound insulation performance due to density reduction in existing automotive interior materials during the pursuit of lightweighting, as well as sound leakage caused by poor installation fit. This invention constructs a microscopic resonant sound-absorbing network by introducing coupling agent-grafted modified hollow glass microspheres, significantly improving noise blocking capability across the entire frequency band while significantly reducing density. Simultaneously, it utilizes the shape memory effect to achieve adaptive volume control, supporting high compression ratio storage and thermally induced in-situ expansion sealing, effectively eliminating the risk of sound leakage through gaps, and achieving a synergistic improvement in lightweighting, high noise reduction, and excellent mechanical properties.

The embodiment of the invention provides a defect metamaterial and a preparation method thereof, and relates to the technical field of metamaterial manufacturing. The method comprises the following steps: based on an initial TPMS (Tire Pressure Monitor System) structure, constructing an initial triangularization grid limited by a predetermined straight line segment in a tetrahedron; by introducing new vertexes and increasing boundary straight line segments, the defect level of the grid is improved, and a plurality of non-overlapping triangular patches formed by connecting the original vertexes and the new vertexes are formed; performing iterative evolution and Bonnet rotation on the grid according to an energy criterion to obtain a TPMS conjugate surface limited in a tetrahedral cell element; and generating a TPMS unit cell structure along the surface of the basic tetrahedron in a mirror symmetry manner by utilizing the symmetry of the initial structure. According to the method provided by the embodiment of the invention, the specific stiffness and specific strength of the deficient metamaterial under low density are remarkably improved, the industrial problem that the mechanical property of the deficient metamaterial is sharply attenuated along with the reduction of the density is solved, and the process bottleneck that residues such as uncured resin / unsintered powder are difficult to discharge in additive manufacturing is thoroughly solved.

This invention relates to a capacitor and a circuit board molded body using the same, and aims to avoid a decrease in mounting density on the circuit board and inefficiencies in resin molding work. [Solution] Noticing that strong pressure from the molded resin is applied to the first top surface 6 of the main body case 2 during resin molding, a cap 3 is placed over the surface of the first top surface 6 of the main body case 2. This cap 3 prevents damage to the capacitor 1 due to resin molding. Furthermore, the cap 3 is placed over the surface of the first top surface 6 of the main body case 2 in advance. This eliminates the need to place the cap 3 during the molding process, improving the efficiency of the molding process. In addition, the thickness of the second side surface 16 of the cap 3 is made thinner than the thickness of the second top surface 15 of the cap 3. This suppresses the need to increase the diameter of the capacitor 1 itself. As a result, a decrease in mounting density on the circuit board and inefficiency in the resin molding process can be avoided.

An ink jet recording method of recording an image on a recording medium using an aqueous ink that contains a particle, a first resin particle and a second resin particle. The method includes heating the recording medium, to which the aqueous ink has been applied, to a temperature higher than or equal to a glass transition temperature TgR1 or a melting point TmR1 of the first rein particle and lower than a glass transition temperature TgP or a melting point TmP of the particle. The particle has an average primary particle diameter DP of 150 nm or less. A density ratio of a density ρR1 of the first resin particle to a density ρR2 of the second resin particle is more than 1.0 times. The heating includes heating the recording medium to melt the first resin particle so that a hole is generated.

The present application relates to a kind of wide temperature range low-loss manganese-zinc ferrite material and its preparation method, belong to soft magnetic ferrite ceramic material technical field, solve the problem that the magnetic permeability of existing manganese-zinc ferrite material is unstable in wide temperature range, magnetic loss is larger, magnetic flux density is low.According to mass percentage, the content of each component in the ferrite material is respectively:Fe2O366wt%-69wt%, MnO 14wt%-16wt%, ZnO 16wt%-19wt%, Co2O3 0.25wt%-0.38wt%, V2O5 0.06wt%-0.12wt%, MoO3 0.06wt%-0.08wt%, Ce2O3 0.05wt%-0.08wt%, Sm2O3 0.03wt%-0.06wt%.Co2O3 can reduce hysteresis loss;V2O5 can reduce sintering temperature and can avoid the decrease of magnetic permeability;Ce2O3 can realize ferrite liquid phase sintering, improve amplitude permeability, reduce hysteresis loss;Sm2O3 can refine grain, reduce magnetic loss;MoO3 can improve ferrite microstructure density, reduce porosity, improve mechanical properties.The manganese-zinc ferrite material of the present application can be widely used in aerospace environment.

A negative electrode reinforcing composition, and a preparation method and the use. The negative electrode reinforcing composition comprises a component A and a component B. The preparation raw materials of the component A comprise an asphalt powder, a polyvinyl alcohol powder, a redispersible glue powder and a phenolic resin powder in a mass ratio of 10-90:10-90:0-10:0-40. The component B comprises an aqueous solution containing calcium chloride and hydrochloric acid. The mass ratio of the component A to the component B is 1-8:7-28. The negative electrode reinforcing composition can make a carbon micropowder present a good strength curve during the process of preparing artificial graphite, so as to avoid powdering and powder loss caused by slightly low strength, and rough surface, tap density reduction and low product quality of a terminal product caused by subsequent crushing and grinding required by excessively high strength. In addition, the negative electrode reinforcing composition can effectively reduce the impurity level of high-melting-point and high-boiling-point metal elements and compounds in obtained carbon particles, reduce the co-melting point by means of a blend, and avoid the enrichment, coking and hardening of high-melting-point impurities in a graphitization furnace.