5results about How to "Stable structure and performance" patented technology

This application relates to the field of material sealing technology, and particularly to a high-performance insulating ceramic sealing method for neutron tubes. The method includes: sequentially performing organic solvent ultrasonic cleaning and argon plasma etching activation treatment on the sealing surface of a cylindrical high-purity alumina ceramic part, followed by magnetron sputtering deposition of a titanium transition layer to obtain a ceramic part with a titanium transition layer; acid washing to remove the oxide layer from the sealing surface of a Kovar alloy cylindrical flange, followed by cleaning and drying to obtain a metal sealing part; preparing an active brazing filler metal sheet; sequentially assembling the sheet to form a pre-assembled assembly; placing the pre-assembled assembly in a vacuum brazing furnace, applying axial preload to complete the sealing, followed by controlled cooling to form a sealing part with an airtight brazed joint; and annealing to obtain the finished sealing assembly. This method solves the problems of low dielectric strength, large differences in thermal expansion coefficients, and difficulty in controlling interface quality in existing technologies.

The application discloses a kind of composite PP-R pipe materials and preparation method and application thereof, it is related to PP-R pipe material technical field, the composite PP-R pipe material, including by inside to outside sequentially connected PP-R inner layer, impact resistance oxygen barrier layer and PP-R outer layer, the impact resistance oxygen barrier layer includes parylene, polyglycolic acid, compatibilizer.The composite PP-R pipe material adds impact resistance oxygen barrier layer as middle layer in it, the material of the impact resistance oxygen barrier layer uses the cooperation of parylene and polyglycolic acid (PGA), with excellent mechanical properties and gas barrier property, and can keep structural performance stable under low temperature environment below-10 DEG C, can be applied in PP-R pipe material system to improve its low temperature brittleness, improve low temperature impact resistance.

The invention relates to the technical field of aircraft cushion pads, and discloses a foamed rubber low-altitude aircraft cushion pad which comprises a cushion pad body. The cushion pad body is designed to be of a gradient density structure, the cushion pad body comprises functional layers which are compounded into a whole from top to bottom in a co-vulcanization mode, and the functional layers comprise an impact layer which is a high-density foaming rubber layer; the transition layer is a medium-high density foamed rubber layer; the buffer layer is a low-density high-resilience foaming rubber layer; through the synergistic effect of the gradient density structure and the macroscopic cavity, efficient absorption and step-by-step dissipation of impact energy are achieved, and the low-density high-resilience layer ensures excellent permanent deformation resistance. A co-vulcanization process and a specific material system endow the product with an integrated stable structure and fatigue resistance, the defects that a traditional cushion pad is prone to collapse, aging and cracking are fundamentally overcome, the reliability of the buffering performance is remarkably improved, and the service life of the buffering performance is remarkably prolonged.

The utility model relates to communication vibrator equipment technical field especially a kind of mesh octogram ultra-wideband vibrator, it includes support, set up the radiation metal plate and feed piece of octogram structure.The radiation metal plate includes four radiation sheets.The area enclosed by four radiation sheets is coaxially arranged with support.The vertex of two adjacent radiation sheets is provided with concave point, and the vertex of other two adjacent radiation sheets is provided with protruding convex point, and feed piece is coupled and connected in two concave points, two convex points.Feed piece is electrically connected by feed hole, cable core hole and cable core, feed column on it.Radiation metal plate on support is set into diamond type plane structure, so that vibrator can work in the frequency range of 680-960MHz VSWR≤1.4, can realize the antenna of more uniform beam width within horizontal plane 3dB width, can realize wideband and ultra-wideband in low frequency band, and compatibility is stronger.