12results about How to "Strong bonding between layers" patented technology

The invention discloses a sulfur-free FR-4 copper-clad plate and a preparation method thereof, and belongs to the technical field of copper-clad plates. The copper-clad plate is prepared from sulfur-free epoxy resin, a sulfur-free curing agent, a sulfur-free flame retardant, organic silicon hybrid macromolecules, tetrafunctional epoxy resin, linear phenolic resin, microencapsulated ammonium polyphosphate, melamine cyanurate, surface grafting modified boehmite nanorods and filler. Through the design of a sulfur-free system, the sulfur content of the product is lower than 50 ppm, and the problems of contact resistance increase, unstable signal transmission and the like caused by sulfide migration of a traditional FR-4 copper-clad plate in a high-temperature and high-humidity environment are thoroughly solved. Meanwhile, the organic silicon hybrid macromolecules and the high-functionality epoxy resin have a synergistic effect, so that the balance of high glass transition temperature and high toughness is realized. The copper-clad plate has excellent dielectric property, flame retardant property and long-term reliability, and meets the development requirements of high reliability and high performance of electronic products.

This invention relates to the field of functional filtration materials technology, specifically to a gradient interlocking knitted-woven composite filter cloth. It comprises a woven dual-pore structure superoleophilic and oil-guiding surface layer, a knitted three-dimensional fluffy structure superoleophobic filter core layer, a conductive electret transition layer with a textured surface that eliminates static electricity and adsorbs fine oil mist, and a woven continuous microgroove structure superoleophobic and oil-draining bottom layer. These four layers are composited from top to bottom, forming an interlocking weave structure. The pore size of the filter core layer decreases gradually from top to bottom, while the pore size of the oil-draining bottom layer increases gradually from top to bottom. The overall pore size of the filter cloth first decreases gradually from top to bottom, then increases gradually. This filter cloth achieves graded and precise filtration through multi-layer composite structure and gradient pore size design. The interlocking weave structure enhances the overall structural stability, while also possessing multifunctional properties such as directional oil guidance and drainage, conductive electret antistatic properties, and more.

This invention discloses an extruder head flow channel orifice structure and its application in tire tread winding, belonging to the field of tire manufacturing technology. The extruder head flow channel orifice structure includes an extruder body with a flow channel orifice connected to its end. Its core improvement lies in the non-circular shape of the extrusion orifice. This breaks through the limitations of traditional circular orifices; the non-circular design, such as rectangular or near-circular shapes, allows for adjustment of the rubber strip cross-sectional shape according to the functional requirements of different parts of the tread (such as the crown and shoulder), optimizing the contact area and bonding pressure distribution between the rubber strip and the forming drum, reducing bonding air bubbles, and improving interlayer bonding strength. The tire tread winding method involves extruding a continuous rubber strip using the extruder head flow channel orifice structure and then winding this strip onto the forming drum in a seamless manner to form the tread.

The invention relates to a chip solid capacitor and a coating process thereof, the chip solid tantalum capacitor is composed of a tantalum block, a dielectric oxide layer, a cathode layer, a transition layer, a silver layer and a plastic package layer, the cathode layer is a manganese dioxide layer, and the manganese dioxide layer is formed by thermal decomposition on the tantalum block on which the dielectric oxide layer grows through the coating process; the specific operation of the coating process is specifically limited, and the tantalum block is sequentially impregnated with thin-thick-thick-thin coating liquid, so that the prepared cathode layer is high in density, high in interlayer binding force and free of bubbling and delamination defects, the qualification rate and the moisture resistance of the product are greatly improved, meanwhile, parameters of all stages are controllable and adjustable, and the production cost is reduced. And the production requirements of high-specific-volume tantalum capacitors with different specific volume grades can be met, and the method has a good industrial application prospect.

The application discloses a kind of high flame-retardant temperature-resistant corrosion-resistant optical fiber composite cable and preparation method thereof, belong to cable manufacturing technical field, from inside to outside include optical fiber unit, conductor layer, insulating layer, shielding layer, anticorrosive layer and sheath layer in sequence.Optical fiber unit uses ceramicized silicone rubber buffer layer;Conductor layer is nickel-plated copper alloy stranded wire, and oxidation resistance is enhanced by nano titanium dioxide sol treatment;Insulating layer is three-layer co-extrusion structure;Shielding layer uses aluminum-plastic composite tape and plated tin copper wire braided composite structure;Anticorrosive layer is polytetrafluoroethylene film treated by plasma;Sheath layer uses two-component ceramicized silicone rubber, and it is flexible at room temperature vulcanization, and it is converted into ceramic body at high temperature.The application realizes excellent continuous use stability, strong corrosion resistance in salt spray environment and other performances through the synergistic design of multilayer structure, is suitable for high temperature, corrosion, fire and other harsh environments, significantly improves the safety and durability of composite cable.

The present application belongs to the field of stainless steel surface treatment, and discloses a kind of stainless steel high-temperature oxidation resistant coating and preparation method and stainless steel product.The coating includes primer and topcoat: the primer contains micro-nano silicon sol, nano zinc / magnesium powder, potassium salt and polyethylene glycol; the topcoat contains polysiloxane, silicone oil, nano Zn powder, nano CuO powder, NiO powder, polyethylene glycol, water and leveling agent.The primer and topcoat are wet sprayed and then preheated at 100-180 DEG C and sintered at 250-350 DEG C to form a composite coating.The present application blocks diffusion by regulating and controlling film vacancy defects, and the coating has a contact angle > 90 DEG, a wear resistance > 5000 times, a weight gain ≤ 0.0141 mg / cm2 after 600 DEG C oxidation for 30 h, and excellent high-temperature oxidation resistance.

This invention provides a gradient silicon nitride ceramic femoral head prosthesis and its preparation method, relating to the technical fields of clinical medicine and biomaterials. The femoral head prosthesis is prepared from 88-94 parts of silicon nitride powder, 4-12 parts of sintering aid, 5-20 parts of tungsten carbide titanium, and 0-30 parts of pore-forming agent, wherein the pore-forming agent cannot be 0 parts. The gradient silicon nitride ceramic femoral head prosthesis of this invention retains the advantages of silicon nitride ceramics—low wear, low friction, high strength, high fracture toughness, and good chemical stability—at the interface between the femoral head prosthesis and the liner, while reducing wear on the titanium alloy femoral stem cone caused by the large hardness difference between the femoral head prosthesis and the liner. This reduces the incidence of organ toxicity, periprosthetic osteolysis, and aseptic loosening caused by metal wear debris, improves the survival rate of the femoral head prosthesis and the femoral stem cone, reduces the revision rate of replacement surgery, and saves patients' treatment costs.

The application discloses an Hf-Ta-Si / (Hf,Zr)B2 layered composite ultrahigh-temperature protective coating which is composed of a TaSi2 bottom layer, a ceramic layer surface layer with (Hf,Zr)B2 ultrahigh-temperature ceramic as a main phase and a Ta5Si3 interface reaction layer located at the interface between the substrate and the TaSi2 bottom layer, and the interface between each layer is an in-situ reaction autogenous interface; the coating is obtained by prepositioning the slurry of raw material powder on the surface of a tantalum alloy, drying, and then vacuum reaction sintering in one step; the coating has excellent ultrahigh-temperature oxidation resistance, heat scouring resistance and thermal shock resistance, and can effectively protect the tantalum alloy material under the conditions of oxygen, heat scouring and strong thermal shock at 1000 DEG C to 1800 DEG C; the method can reduce the adverse effects of the melting and sintering process on the microstructure and mechanical properties of the tantalum alloy, avoid the problem of preparing the ultrahigh-temperature ceramic coating on the surface of a tantalum alloy with a complex shape, and has higher coating deposition efficiency and lower cost.

This invention relates to the field of cyanide-free conversion coating technology for aluminum alloys, and particularly to a synergistic multi-component conversion liquid, its preparation method, and its application. The synergistic multi-component conversion liquid provided by this invention utilizes the synergistic effect between specific components, combined with specific content limitations, to achieve a synergistic multi-component conversion film with excellent bonding performance. It not only has strong bonding strength with aluminum-based materials, but also strong bonding strength with subsequent coatings when an existing coating is present, resulting in lower porosity and better protection of the aluminum-based materials. The synergistic multi-component conversion liquid provided by this invention achieves the above effects with a relatively small dosage, thus making significant progress in lightweighting. The aluminum-based composite material provided by this invention uses aluminum-based materials as a matrix, and the synergistic multi-component conversion liquid of the above scheme forms a synergistic multi-component conversion film on the surface of the aluminum-based material. The interlayer bonding strength is strong, preventing corrosion of the aluminum-based material and significantly improving corrosion resistance.

The invention relates to the technical field of electronic information materials, and discloses a sulfur-free CEM-3 copper-clad plate preparation method and a CEM-3 copper-clad plate thereof. According to the preparation method of the sulfur-free CEM-3 copper-clad plate, the sulfur-free raw materials and the sulfur-free preparation technology are adopted in the whole process through the three steps of resin glue solution preparation, core material and surface material preparation and hot-pressing curing, especially the resin glue solution with a specific composition formula, and control over the specific temperature and time in the post-curing stage in hot-pressing curing are adopted, so that the sulfur-free CEM-3 copper-clad plate is obtained. The prepared CEM-3 copper-clad plate has the sulfur-free layering resistance, the copper foil peel strength is greater than or equal to 1.39 N / mm, the ion migration resistance is high, the dielectric loss Df is small, the dielectric constant Dk is stable, the relative tracking index CTI is remarkably improved, and the CTI value gt is remarkably increased; therefore, the stability and the reliability of the CEM-3 copper-clad plate in high-temperature welding and application environments are guaranteed.

This invention belongs to the field of biomedical materials and flexible sensing technology, and particularly relates to an implantable pressure sensor, its preparation method, and its application. The pressure sensor has a three-layer parallel plate structure, wherein the electrode layer is a conductive hydrogel prepared from polymerizable zwitterionic monomers, the dielectric layer is a microphase-separated hydrogel formed by copolymerization of acrylamide monomers and acrylate monomers, and the encapsulation layer is a biocompatible polymer fiber membrane. By controlling the material composition, polymerization conditions, and structure, the device achieves good matching with biological soft tissues in terms of water content and tissue adaptability. In terms of functional characteristics, the implantable sensor exhibits advantages such as sensitive pressure response and strong cyclic stability, and can be applied in fields such as tissue engineering, physiological or pathological signal monitoring, neural stimulation modulation, and drug delivery.

The application provides a cable sheath, a preparation method thereof and a cable. The cable sheath comprises a three-layer structure arranged in sequence from inside to outside: a core layer comprising a porous framework, a liquid metal and an encapsulation layer, the liquid metal forming a continuous conductive network; a middle layer comprising a light-curable elastic polymer matrix, microcapsules and reinforcing particles; and an outer protective layer comprising a light-curable stimulus-responsive polymer matrix and functional nanomaterials, at least one of the heat conduction performance and the electromagnetic shielding efficiency of the outer protective layer being capable of changing according to changes in the external environment, the core layer, the middle layer and the outer protective layer being covalently bonded through an interfacial compatibilizer and integrated light curing. The cable sheath can realize mechanical strength self-healing and electrical self-healing after mechanical damage, and self-adaptive adjustment to changes in the external temperature and electromagnetic field environment, and the layers of the cable sheath are covalently bonded, so that the interlayer bonding force is strong and the structure is stable.