8results about How to "Improved stress distribution" patented technology

The invention relates to the field of heat dissipation structures, and discloses a preparation method of a graphene heat dissipation structure and the graphene heat dissipation structure. The preparation method comprises the following steps: carrying out die cutting operation on a single-sided adhesive to obtain a molded single-sided adhesive layer, carrying out die cutting operation on a graphene heat dissipation layer to obtain a molded graphene heat dissipation layer, oppositely attaching the molded graphene heat dissipation layer to a first adhesive layer, and carrying out die cutting operation on a first double-sided adhesive to obtain a molded double-sided adhesive tape; the formed double-faced adhesive tape is attached to the first adhesive layer in an opposite mode, the second double-faced adhesive tape is subjected to die cutting operation, a formed double-faced adhesive tape layer is obtained, the formed double-faced adhesive tape layer is attached to the double-faced adhesive tape and the graphene heat dissipation layer in an opposite mode, and the graphene heat dissipation structure is obtained. The width of the covered edge structure is increased, the stress dispersion performance of the covered edge structure is enhanced, the waterproof performance is improved, the covered edge layering phenomenon is avoided, the heat dissipation performance of the graphene heat dissipation layer is guaranteed, the overall structure stability is improved, and the service life is prolonged.

This invention discloses a hip joint prosthesis for bone defects, comprising a crescent-shaped acetabular rim filler assembly, a bone-metal defect block, an acetabular wall defect support block, a cylindrical support block, an angle pad, a locking screw, a locking nut, an assembly screw, an acetabular sealing screw, and an acetabular support block. The crescent-shaped acetabular rim filler assembly includes two sets of crescent-shaped acetabular rim fillers, which are assembled by engaging pins through pin holes. The outer circumference of the bone-metal defect block of the acetabular support block is connected to the crescent-shaped acetabular rim filler assembly via bone cement. This hip joint prosthesis for bone defects effectively fills irregular defect areas of the acetabular rim. The various screw holes and Kirschner wire holes on its surface provide multi-dimensional fixation options. The overall structure, through the synergistic action of multiple components, achieves precise reconstruction while ensuring biomechanical performance, significantly reducing the risk of postoperative prosthesis loosening and wear.

The application discloses a kind of organic silicon modified amine epoxy curing agent and preparation method thereof, the curing agent structure is composed of organic silicon, phenol, amine structure, preparation method includes the following steps: (1) the phenolic compound of double bond substituent group, catalyst and hydrogen-containing silicone oil are stirred and mixed uniformly under 50~75 ℃ nitrogen atmosphere, then heated to 65~90 ℃ and react for 4~6h, then solvent is removed by evaporation to obtain organic silicon modified phenol;(2) polyamine, organic silicon modified phenol, aldehyde compound and solvent are mixed uniformly, stirred uniformly under 50~75 ℃ nitrogen atmosphere, then refluxed and react for 2~4h, after solvent is removed by evaporation to obtain organic silicon modified amine epoxy curing agent.The application solves the problem that the bonding performance of epoxy adhesive is poor in humid or underwater environment, effectively improves the bonding performance of epoxy adhesive in seawater, freshwater and other underwater environment, and provides technical support for the bonding and sealing of moisture-resistant and heat-resistant electronic packaging, deep-sea underwater marine equipment and facilities.

The invention provides an Ag-WC-C electric contact material and a preparation method thereof, and the method comprises the steps: mixing silver powder, tungsten carbide powder, carbon fiber powder and additive powder according to a preset proportion to obtain mixed powder; carrying out wet ball milling on the mixed powder; carrying out drying treatment on the materials subjected to ball milling; pre-sintering the dried material; the pre-sintered material is subjected to isostatic pressing treatment, and an Ag-WC-C spindle is obtained; the Ag-WC-C ingot is sintered, and a green body is obtained; carrying out hot extrusion on the green body to obtain an Ag-WC-C strip; the Ag-WC-C strip is subjected to heat treatment; and thermally compounding the thermally treated Ag-WC-C strip with a pure silver strip to obtain the Ag-WC-C electric contact material. According to the invention, a powder mixing process and an extrusion process are combined, so that the conductivity, compactness, arc ablation resistance, mechanical fatigue resistance and the like of the Ag-WC-C electric contact material product are improved, and the service life of the Ag-WC-C electric contact material product is prolonged.

The utility model discloses an aluminum alloy cardba hub, including the rim and the spoke, the spoke is connected on the rim one end top, be equipped with a plurality of air holes on the spoke, and the one end of spoke is the mounting surface, and the center of mounting surface is the center's positioning hole, and be equipped with a plurality of mounting holes on the mounting surface, the recess of spoke and rim junction is provided with the air valve hole, and the air valve hole and air hole are staggered. Compared with the prior art, the air valve hole of the utility model is located in the recess of the junction of the spoke and the rim, and the air valve hole and the air hole are staggered, which is beneficial to stress dispersion, avoids the common crack caused by the overlapping of the air valve hole and the air hole position, and improves the safety performance of the aluminum alloy cardba hub.

The application discloses a multilayer distributed current collector with improved binding force and a preparation method thereof, a pole piece and a battery, and comprises a polymer film, a copper foil and an aluminum foil, the two sides of the polymer film are respectively provided with a first adhesive layer and a second adhesive layer, the polymer film is combined with the copper foil on one side through the first adhesive layer and is combined with the aluminum foil on the other side through the first adhesive layer, the side of the copper foil and the side of the aluminum foil facing the polymer film are respectively provided with a hole array, and the combination of the polymer film, the copper foil and the aluminum foil is provided with controllable corrugation. Through the synergistic scheme of nano-hole anchoring and controllable corrugation structure, the interface stability and safety of the pole piece are significantly improved.

This utility model relates to the field of motion platform technology, specifically a stress reinforcement mechanism for a motion platform, including a first panel, a second panel fixedly welded to the right side of the first panel, a second reinforcement frame fixedly welded to the bottom of the second panel, the top of the second reinforcement frame fixedly welded to the bottom of the first panel, and the bottom of the first panel fixedly welded to the bottom of the first panel. The right side of the first reinforcement frame abuts against the left side of the second reinforcement frame. When the motion platform is running, the second reinforcement frame can disperse some of the stress, while the first reinforcement frame can support the second reinforcement frame, further dispersing the stress, thereby avoiding stress concentration at the weld between the first and second panels and preventing the first and second panels from breaking apart.

This invention discloses a corrosion-resistant and wear-resistant epoxy coating, which is made from the following raw materials in parts by weight: 1-5 parts carbon nanotubes, 5-10 parts chopped carbon fibers, 10-20 parts silicon carbide powder, 80-150 parts dimethylformamide solvent, 100-200 parts epoxy resin, 100-200 parts curing agent, and 1-2 parts leveling agent. This invention also discloses a method for preparing the corrosion-resistant and wear-resistant epoxy coating, involving surface modification of carbon nanotubes, silicon carbide, and chopped carbon fibers; preparation of a composite modified epoxy coating of carbon nanotubes / chopped carbon fibers / silicon carbide; and preparation of the corrosion-resistant and wear-resistant epoxy coating using the composite modified epoxy coating. The epoxy coating prepared by this invention can give the coating properties such as corrosion resistance, wear resistance, and crack resistance, greatly improving the service life of the coating in complex environments, and has important theoretical significance and engineering application value.