5results about How to "Improve interface binding state" patented technology

This invention discloses a method for preparing high-entropy ceramic matrix composites using a reactive infiltration process, belonging to the technical field of ceramic matrix composites. The steps are as follows: at least four single-component carbides are ball-milled and mixed with a carbon source, then dispersed in a dispersion liquid to obtain a slurry; continuous fibers are woven into a preform, and an interface layer and a matrix layer are deposited to obtain a semi-dense composite material; the slurry is introduced through vacuum or pressure impregnation; and a high-entropy carbide matrix is ​​generated in situ and densified by reactive infiltration after embedding with a transition metal and its alloy. This invention solves the problems of long process cycles, high porosity, high cost, and insufficient introduction of high-entropy ceramics in existing processes, achieving rapid densification and improving the material's high-temperature stability, oxidation resistance, and ablation resistance. It is suitable for the large-scale production of thermal protection materials for hypersonic vehicles.

The application discloses a lithium niobate-based surface acoustic wave sensor and a preparation method thereof. The sensor is composed of an alumina lower protective layer, a lithium niobate piezoelectric layer, an AlN transition layer, an interdigital transducer (IDT), a reflective grating, and an alumina upper protective layer to form a sandwich multilayer structure. The interdigital transducer is made of a high-temperature-resistant metal. The device has a simple structure and can effectively monitor temperature. Through the synergistic design of the multilayer sandwich structure, the AlN transition layer and the high-temperature-resistant metal electrode, the device can adapt to a high-temperature complex environment, is wireless and passive, has strong stability, can widen the upper temperature limit of the lithium niobate-based temperature sensor, and effectively improves the performance and service life of the lithium niobate-based temperature sensor.

The invention discloses a polyethylene short fiber reinforced concrete outdoor hollow decorative plate and a preparation method thereof, and relates to the field of fabricated buildings. According to the decorative plate, Portland cement is used as a base material and matched with raw materials such as polymer-coated pre-water-absorbing ceramsite and polyethylene short fibers; during preparation, the acrylate polymer emulsion modified ceramsite is prepared through a core-shell step-by-step pre-emulsification technology, then the polyethylene short fibers are added into a concrete system in batches to be evenly stirred, and the polyethylene short fiber reinforced concrete outdoor hollow decorative plate is prepared through cast-in-place forming and curing. The problems that a traditional outer wall decorating plate is prone to cracking, large in dead weight, poor in heat preservation and insufficient in durability are solved, the compression resistance, crack resistance and bending strength of the decorating plate are improved, the water absorption rate is reduced, the light weight and heat preservation and heat insulation effects are considered, and the requirement for green building development is met.

The application relates to the technical field of high polymer composite materials, and discloses a carbon fiber reinforced polyether ether ketone composite material, a preparation method thereof and an elevator hub, wherein the composite material is mainly made of polyether ether ketone, polyether imide, diphenyl sulfone and pre-coated carbon fiber. The pre-coated carbon fiber is attached with a B-stage solid-state boron-modified thermoplastic phenolic resin on the surface, and when the pre-coated carbon fiber is heated during extrusion, the resin is converted into a C-stage network, topological-level physical entanglement occurs between the resin and the macromolecular chain segments of the matrix, and a semi-interpenetrating polymer network structure is formed in situ at the interface. When the composite material is prepared, the flash phase change of the diphenyl sulfone under specific temperature and pressure generates micro-bubbles, and the micro-bubbles carry water molecules released by interface polycondensation and discharge the high-viscosity melt. The application improves the interface bonding state between the carbon fiber and the matrix, reduces the micro-porosity of the composite material, improves the mechanical strength and the fatigue resistance of the material, and can be used for injection molding of structural parts such as large-load elevator hubs.

The invention relates to the technical field of sodium ion batteries, and discloses a diaphragm and a sodium ion battery using the diaphragm, the diaphragm comprises a porous base membrane and a functional coating coated on at least one surface of the porous base membrane; the functional coating is prepared from the following raw materials in parts by weight: 85-95 parts of a ferric sodium pyrophosphate active material, 4-10 parts of a binder and 1-5 parts of a conductive agent. In the sodium ion battery, one side of the diaphragm, which is provided with the functional coating, is arranged towards the positive pole piece, and the coating is in close contact with the positive pole through hot-pressing shaping. The high-proportion ferric sodium pyrophosphate is loaded on the diaphragm, and the sodium removal characteristic of the ferric sodium pyrophosphate during first-time charging is utilized, so that extra sodium ions are provided for the negative electrode to compensate for consumption formed by an SEI film, and the first-time coulombic efficiency and energy density of the battery are improved; meanwhile, high-temperature shrinkage of the base membrane is inhibited by utilizing a heat-resistant framework supporting effect of the coating, internal short circuit of the battery is prevented, and the thermal safety of the battery is enhanced.