34results about How to "Key length" patented technology

A composite structure comprises stacked sets of laminated fiber reinforced resin plies and metal sheets. Edges of the resin plies and metal sheets are interleaved to form a composite-to-metal joint connecting the resin plies with the metal sheets.

The invention belongs to the technical field of material preparation and in particular relates to a preparation method of a WC-Co-cBN composite material. The preparation method of the WC-Co-cBN composite material comprises the following steps: firstly weighing WC, metal Co powder and cBN raw material in proportion, uniformly mixing, mixing by carrying out ball milling, drying the mixed raw materials in a drying oven at the temperature of 50-200 DEG C, then sieving with a sieve of 100-300 meshes, putting the dried raw materials into a mould, then placing the mould into a hot-pressing sintering furnace, heating the sintering furnace to 1200-1400 DEG C at a speed of 30-50 DEG C / min, insulating for 5-30 minutes, and maintaining pressure to be 20-50MPa, so that the WC-Co-cBN composite material is obtained. The preparation method of the WC-Co-cBN composite material has the advantages that the hot-pressing method is adopted, the sintering temperature is low, sintering time is short, and no phase transformation of cBN can be guaranteed while the WC-Co-cBN composite material has high shrinkage percentage and high volume density; meanwhile, hot pressing energy consumption is low, cost is low, operation is easy, and safety coefficient is high.

The invention discloses a high-temperature-resistant blended yarn, which belongs to the technical field of textile yarns, and aims to provide a high-temperature-resistant blended yarn with excellent anti-oil performance and easy to popularize. The present invention includes an outer layer and a core layer, the outer layer is coated on the core layer, the outer layer includes a flame-retardant layer, an oil-proof layer and a skin layer polymer arranged from the inside to the outside, and the core layer includes a main core wire and a The temperature-regulating viscose fiber is a temperature-adjusting viscose fiber whose main cores are intertwined with each other. The main cores are formed by blending polyimide fibers and polyether ketone. The invention has the advantages of excellent high temperature resistance and oil stain resistance, suitable for manufacturing oil stain resistant carpets for restaurants, practical and effective, and strong popularization.

The invention discloses a medium dielectric constant high-Q microwave dielectric ceramic material and a preparation method thereof, which belong to the technical field of electronic functional materials and devices. Described ceramic material is made of BaO, SrO, La 2 o 3 、TiO 2 and Al 2 o 3 Composition, its weight percentage is: 0.1% ~ 3.0% BaO, 0.1% ~ 8.0% SrO, 59% ~ 74% La 2 o 3 , 21% ~ 30% TiO 2 ,0.1%~7.0%Al 2 o 3 ; The dielectric constant of the ceramic material is 39.2-48.6, the Q×f value is 51600-89900 GHz, and the temperature coefficient of resonance frequency is -0.8-30.3 ppm / °C. Compared with microwave dielectric ceramic materials with similar dielectric constants, the microwave dielectric ceramic materials of the present invention have a higher Q×f value and a near-zero resonant frequency temperature coefficient, and are expected to be used for making dielectric resonators, dielectric filters and High-performance microwave devices such as microwave capacitors.

The invention discloses an asymmetric dinuclear cyclometal platinum (II) complex with D-A-A configuration π conjugated system and its application. The metal platinum (II) complex is based on pyrene (triphenylamine, etc.)- Pyridine-pyridine (D-A-A configuration) is the main ligand, 2,2,6,6-tetramethyl-3,5-heptanedione is the auxiliary ligand, adopts a dinuclear coordination method, and the middle A unit Provide two coordination points; the metal platinum (II) complex enhances the external quantum efficiency by strengthening the molecular rigid structure and molecular spin-orbit coupling, providing more triplet energy levels, etc., and enhancing the external quantum efficiency. , it has obvious advantages as a near-infrared organic electroluminescent material, and the prepared near-infrared organic electroluminescent device shows considerable photoelectric conversion efficiency.

The invention relates to the technical field of lithium ion battery negative electrode materials, and discloses a lithium ion battery negative electrode material doped with phosphorus lithium vanadate, which comprises the following formula raw materials: activated porous carbon, Li 3 V 0.85‑0.95 P 0.05‑0.15 o 4 , Adhesive. The anode material of lithium ion battery of this kind of phosphorus-doped lithium vanadate, P-doped Li 3 VO 4 prepared Li 3 V 0.85‑0.95 P 0.05‑0.15 o 4 , which enhances the Li 3 V 0.85‑ 0.95 P 0.05‑0.15 o 4 The conductivity of the battery promotes the diffusion and migration of metal ions and charges between the electrode material and the electrolyte, thereby reducing the voltage polarization during the charging and discharging process of the battery, improving the specific capacitance and electrochemical reversible capacity of the battery, and enhancing the strength of the battery. electrochemical performance, and P-doped Li 3 VO 4 , which reduces the bond length of the Li-O bond, increases the bond energy, and promotes the Li‑O bond 3 V 0.85‑0.95 P 0.05‑0.15 o 4 form a structurally stable cubic octahedral pyramid structure, avoiding the Li 3 V 0.85‑0.95 P 0.05‑0.15 o 4 In the process of lithium intercalation and delithiation, the phenomenon of loss of its crystal structure due to slight strain leads to enhanced rate performance and electrochemical cycle stability of cathode materials.

The invention relates to a coating for the inner wall of an oil field pipeline and a preparation method thereof. A component A of the coating consists of the following components in part by weight: 15 to 50 parts of trifluoroethylene-vinyl ether fluoro-resin, 8 to 30 parts of lubricating filler, 1 to 3 parts of dispersing auxiliary agent, 10 to 20 parts of solvent, 15 to 45 parts of colour paste and 1 to 6 parts of lubricating auxiliary agent, wherein the colour paste consists of the following components in part by weight: 40 to 80 parts of film forming resin, 1 to 3 parts of dispersing auxiliary agent, 10 to 40 parts of solvent and 2 to 40 parts of pigment; and the film forming resin is three kinds of biphenol A epoxy resins, namely biphenol A epoxy resinE-20, biphenol A epoxy resin E-12and biphenol A epoxy resin E-06, or is trifluorochloroethylene-vinyl ether fluoro-resin. A component B of the coating is a curing agent aromatic toluene diisocyanate addition product. Before construction, the component A and the component B are mixed according to a weight ratio of 10 to 1. The coating of the invention is used for coating the inner wall of the oil field pipeline, is corrosion resistant, makes the inner wall of the pipeline have hydrophobic performance and fulfils the aim of reducing resistance and enhancing effect.