325 results about "Polymer matrix composite" patented technology

A medical electrical lead having a conductor assembly covered by an insulating layer, and a shield covering positioned adjacent or proximate to at least a portion of the insulating layer in order to shield the conductor assembly from one or more electromagnetic fields. The shield covering is formed of a polymer-matrix composite. The polymer-matrix composite includes a polymeric resin having discontinuous conductive fillers provided therein. The discontinuous conductive fillers include one or more of nano-sized metal structures and nano-sized non-metallic conductive structures. The nano-sized non-metallic conductive structures can have a coating formed of one or more metals. The nano-sized non-metallic conductive structures can be formed of carbon. In turn, the nano-sized non-metallic conductive structures can include one or more of carbon nanofibers, carbon filaments, carbon nanotubes, and carbon nanoflakes.

Al2O3-Y2O3-ZrO2/HfO2 ceramics (including glasses, crystalline ceramics, and glass-ceramics) and methods of making the same. Ceramics according to the present invention can be made, formed as, or converted into glass beads, articles (e.g., plates), fibers, particles, and thin coatings. The particles and fibers are useful, for example, as thermal insulation, filler, or reinforcing material in composites (e.g., ceramic, metal, or polymeric matrix composites). The thin coatings can be useful, for example, as protective coatings in applications involving wear, as well as for thermal management. Certain ceramic particles according to the present invention can be are particularly useful as abrasive particles.

The invention discloses a graphene filled polymer matrix composite material. The composite material is prepared through using 90-99 parts by weight of a thermoplastic resin, 0.1-10 parts by weight of a graphene microchip, 0.01-1 part of a coupling agent, and 1-10 parts of a lubricant. The invention also discloses a preparation method of the graphene filled polymer matrix composite material. Compared with other carbon system filled composite materials, the graphene filled polymer matrix composite material has the advantages of easy processing, easy forming, less filler filling amount, wide raw material source, environmental protection and the like. The composite material has the characteristics of excellent electric conductivity, excellent thermal conductivity, good mechanical properties, good dimensional stability, good weather resistance and the like; and compared with present technologies for preparing a graphene/polymer composite material through in-situ polymerization or solution polymerization, the melt blending method for preparing the graphene filled polymer matrix composite material in the invention has the advantages of continuous production, suitableness for the large-scale production, and the like.

The invention discloses a self-repairing fiber reinforced polymer matrix composite and a preparation method thereof. In the method, a double-capsule repairing system respectively containing epoxy resin prepolymer and curing agent is evenly mixed into a resin matrix, then, the matrix curing agent and catalyst are added to be evenly mixed, the obtained mixture is used for dipping fiber reinforcing material, and at last, the self-repairing fiber reinforced polymer matrix composite is obtained by solidifying and shaping. When the self-repairing composite of the invention generates cracks or fiber unsticking damage owing to heat, force, environment corrosion and the like during processing, storing and using process, cracks pass through a restorative capsule which cracks along with the matrix to release reacting substance and quickly polymerize, thus preventing crack from expanding, repairing crack damage, keeping the mechanical property of the composites and prolonging the service life thereof. The self-repairing composite prepared by the invention can automatically finish repairing cracks at the temperature of negative 50-250 DEG C, and the repairing process totally needs no artificial intervention.

The invention discloses a high-flexible polymer matrix composite membrane with high energy density and a preparation method thereof. The composite membrane is composed of a polymer matrix and core-shell structured nano-fibre dispersed in the polymer matrix; the core layer of the core-shell structured nano-fibre is ceramic fibre; the shell layer is an organic matter coated layer, wherein the mass percentage of the polymer matrix is 50-95%; and the mass percentage of the core-shell structured nano-fibre is 5-50%. The polymer matrix and the core-shell structured nano-fibre are composited into the membrane by adopting a solution blending and tape casting method or a bidirectional membrane pulling method, so that a flexible polymer matrix composite material having the advantages of being good in dielectric property, high in breakdown field strength and high in energy density is obtained. The dielectric constant of the composite material can be modulated to 10-40 by adjusting the content of nano ceramic fibre; simultaneously, the dielectric loss Tan delta is kept to be less than 5%, the breakdown field strength is more than 210 kV/mm, and the energy density is 2-6 kJ/L; and the composite material is a material which can be used for capacitors and high power static energy storage.

Polymer-based selective radiative cooling structures are provided which include a selectively emissive layer of a polymer or a polymer matrix composite material. Exemplary selective radiative cooling structures are in the form of a sheet, film or coating. Also provided are methods for removing heat from a body by selective thermal radiation using polymer-based selective radiative cooling structures.

A centrifugal compressor wheel for a turbocharger is disclosed. The wheel includes an axially extending hub having an inlet end, an outlet end, an arcuate outer surface and a shaft bore. The wheel also includes a blade array disposed on the outer surface of the hub, the blade array comprising a plurality of circumferentially-spaced, radially and axially extending, arcuate centrifugal impeller blades disposed thereon; the hub and the blade array comprising a non-woven, discontinuous-fiber-filled, polymer matrix composite material.

The invention discloses a plate capacitor and polymer-matrix composite dielectric material which can be filled with reactive nano particles, belonging to the technical field of the electronic materialand the electronic component. The reactive nano particles are conductive nano particles in core shell structures, the surface of each conductive nano particle is coated with a layer of insulating coating, and the surface of the insulating coating can carry reactive functional groups. The nano particles can be organically combined with polymer through the reactive functional groups and can be evenly dispersed in the matrix of the polymer. The polymer-matrix composite dielectric material which can be filled with the conductive nano particles can be used as the dielectric layer and flexible foilsheets can be used the upper electrode and the lower electrode of the plate capacitor.

The invention relates to a variable rigidity shock insulation integral intelligent support seat and belongs to the technical field of building structure shock absorption. The variable rigidity shock insulation integral intelligent support seat is characterized by comprising an upper connecting plate (1), a lower connecting plate (4), a magnetic conduction steel plate (2), a magnetorheological elastic body (3), an excitation coil (5), a magnetic conduction iron core (6), a polymer matrix composite permanent magnet material (7), a lead core (8), a conducting wire passage (9), an upper connecting screw bolt hole (10), a lower connecting screw bolt hole (11) and a driving power supply (12), wherein the a magnetorheological elastic body (3) and the magnetic conduction steel plate (2) are in a circular ring shape or a square ring shape, the excitation coil (5) and the magnetic conduction iron core (6) are arranged inside a support seat, and the polymer matrix composite permanent magnet material (7) provides a bias magnetic field for a closed magnetic circuit. The variable rigidity shock insulation integral intelligent support seat has the effects and benefits that the shock insulation and the variable rigidity are integrated, the structure is simple, the anti-interference performance is high, the two-way rigidity regulation can be realized, different horizontal rigidities can be provided for the structure according to different quake waves, and the destroy of earthquake disasters on building structures and bridge structures is effectively reduced.

The invention belongs to the field of shape memory functionalized application technology of high performance polymer matrix composite materials, and provides a thermotropic type shape memory composite material. The material comprises the following components: a shape memory polymer and carbon nanotube, wherein the content of the shape memory polymer is 15-85wt%, and the content of the carbon nanotube is 85-15wt%. The carbon nanotube has excellent mechanical properties, electrical property and thermal conductance performance; the carbon nanotube can be used as an enhancer of the polymer matrix composite material, and can be used as a heating element of the thermotropic type shape memory composite material. The thermotropic type shape memory composite material needs to be heated to a certain temperature in order to realize the function thereof, the carbon nanotube of the carbon nanotube enhanced polymer matrix shape memory composite material can be directly electrified for heating, so that dual functions for enhancing and heating the shape memory composite material are realized.

The present invention generally relates to a woven preform for reinforced composite materials and a method of making thereof. Specifically, the present invention is a method of machine weaving fiber preforms for polymer matrix composites that consist of closed perimeters with multiple intersecting members in their interiors. More specifically, the invention is a woven preform and a method of forming thereof with closed cells at the outer edges with continuous hoop reinforcement in each cell of the preform. The woven preform is woven flat in both the warp and weft directions, and then unfolded to achieve the final shape of the structure, and can be processed into composite structural components using known methods such as resin transfer molding or chemical vapor infiltration. Thus, complicated shapes of all sizes can be woven on a conventional loom using the instant method.

A method for forming a graphene -reinforced polymer matrix composite is disclosed. The method includes distributing graphite microparticles into a molten thermoplastic polymer phase; and applying a succession of shear strain events to the molten polymer phase so that the molten polymer phase exfoliates the graphite successively with each event until at least 50% of the graphite is exfoliated to form a distribution in the molten polymer phase of single- and multi-layer graphene nanoparticles less than 50 nanometers thick along the c-axis direction.

Polymer-based selective radiative cooling structures are provided which include a selectively emissive layer of a polymer or a polymer matrix composite material. Exemplary selective radiative cooling structures are in the form of a sheet, film or coating. Also provided are methods for removing heat from a body by selective thermal radiation using polymer-based selective radiative cooling structures.

A stator vane is provided that includes an airfoil and a coating. The airfoil comprises a polymer matrix fiber composite having a melting point, glass transition temperature, or maximum exposure temperature that is less than about 150° C. The coating is formed over the airfoil and comprises a material that is more erosion-resistant than the polymer matrix fiber composite, where the material is the selected from a group of constituents consisting of titanium, chromium, vanadium, and zirconium, and nitrides, carbides, mixed carbonitrides, oxides, oxynitrides, oxycarbides, and oxycarbonitrides thereof. Methods for making the stator vane are provided as well.

Load-bearing structures constructed from polymer matrix composite (PMC) materials, and processes for their production. The structures are produced from at least one shaped panel formed of a continuous fiber reinforcement in a thermoplastic resin matrix. The shaped panel has been thermoformed to have a substantially constant cross-sectional thickness and portions that lie in different planes and are interconnected by one or more bends. The shaped panel is machined to alter its shape, and optionally to produce multiple separate subcomponents therefrom. The machined shaped panel can constitute the entire structure, or the structure can be formed by joining the machined shaped panel with other shaped panels or by joining two or more of the subcomponents. The structure can be installed on an aircraft engine to secure components to the engine.

Fiber-reinforced polymer matrix composites with anisotropic properties are produced by extruding a mixture of very short fibers and a polymer through a die having a surface to volume ratio of at least about 10 in⁻¹.

Methods and systems for controlling a three(3)-dimensional distribution of structural reinforcement elements in a polymer-matrix composite. One embodiment of the invention provides a method that includes adding and curing a shape memory polymer in a plurality of flexible preforms attached with each other after preforming each of the flexible preforms to form a spatially controlled preform and variable stiffness material composite laminate. Here, in this embodiment, at least one of the preforms includes a flexible support formed from a patterned supporting material on a first surface of a stiff-structural sheet and the stiff-structural sheet that has been patterned on the support.