9results about How to "Large strain" patented technology

The application provides a semiconductor laser and a manufacturing method, comprising the following steps: providing an InP substrate; forming a plurality of spaced-apart openings in the InP substrate, the openings extending from the upper surface of the InP substrate to the interior of the InP substrate; forming a buffer layer on the InP substrate, the buffer layer covering the openings to form air gaps, the material of the buffer layer comprising InGaAs and / or InGaAsP; and forming a laser functional stack on the buffer layer. In the semiconductor laser and the manufacturing method, stress is released by introducing air gaps, a buffer layer with a larger lattice constant is obtained on the InP substrate, and a 2.1-2.3 mu m laser functional stack is grown based on the buffer layer, so that a laser epitaxial structure with the characteristics of large strain and high-quality material is obtained on the InP substrate.

The utility model relates to efficient preparation equipment for pure iron and particle reinforced composite materials thereof, which comprises a pure iron pay-off reel, a pay-off reel guide wheel, a high-frequency electromagnetic induction heater, a former, a take-up guide wheel, a take-up reel, a motor, a main shaft and a nano-particle feeding tank, and the pure iron pay-off reel, the pay-off reel guide wheel and the high-frequency electromagnetic induction heater are arranged above the former. The forming device comprises a shell, a rolling wheel, a lower sealing cover and an extrusion die, the shell is a cylinder with the lower end open, a plurality of iron wire inlets are formed in the periphery of the upper end of the shell, a feeding port is formed in the center of the upper end of the shell, a nano-particle feeding tank is installed on the feeding port, a motor is installed at the upper end of a main shaft, the lower end of the main shaft enters the shell to be connected with the rolling wheel, and the motor drives the rolling wheel to rotate. An upward protruding disc is arranged at the upper end of the rolling wheel, outward protruding embossing or threads are arranged on the wall of the cylinder, a lower sealing cover is installed in the shell below the rolling wheel and is in an inverted cone shape, the periphery of the lower sealing cover is fixed to the inner wall of the shell, and an extrusion die is installed close to the periphery of the lower sealing cover.

The invention provides a corundum mullite ceramic material, a molybdenum metal heterogeneous component and a brazing manufacturing method and application of the corundum mullite ceramic material and the molybdenum metal heterogeneous component. The corundum mullite ceramic takes corundum and mullite as main crystal phases and is prepared by sintering corundum micro powder and mullite at high temperature. The corundum mullite ceramic material has better thermal shock resistance while having better mechanical properties such as strength, toughness, impact resistance and the like, and can be used as an insulating material for a thermoelectric conversion device instead of aluminum oxide ceramic. According to the corundum mullite ceramic-molybdenum metal heterogeneous component and the brazing manufacturing method thereof, corundum mullite ceramic and molybdenum metal are welded together mainly through a brazing process, so that a corundum mullite ceramic and molybdenum metal brazed joint which is high in connection strength, stable and reliable is obtained. Therefore, the corundum mullite ceramic-molybdenum metal heterogeneous component can be used in a thermoelectric conversion device.

This invention discloses a multi-directional water-impact frequency-upgrading piezoelectric energy harvesting device and method, belonging to the field of piezoelectric material energy harvesting control. The device includes: an outer frame, a cantilever base plate, a piezoelectric sheet, a mass block, a cylindrical water tank, and an elastic film. One end of the cantilever base plate is fixed to the inner side wall of the outer frame, and the other end is fixed to the mass block. The piezoelectric sheet is attached to the cantilever base plate to form a low-frequency drive system. The bottom end of the cylindrical water tank is fixed to the lower surface of the outer frame, and the elastic film is attached to the cavity at the top of the cylindrical water tank to form a high-frequency piezoelectric system. Under external low-frequency vibration excitation, the low-frequency drive system, which has a lower natural frequency, resonates, greatly increasing the vibration amplitude of the water tank. This causes the water in the water tank to continuously and significantly impact the high-frequency piezoelectric system, achieving the purpose of frequency upgrading. This invention utilizes water impact to drive the high-frequency piezoelectric beam to upgrade its frequency, improving the energy harvesting efficiency and output power of the piezoelectric energy harvesting device. Simultaneously, it has advantages such as simple production and assembly, being environmentally friendly and pollution-free, and having a miniaturized structure.

The invention provides a semiconductor laser and a manufacturing method thereof. The manufacturing method comprises the following steps: providing an InP substrate; forming a plurality of openings arranged at intervals in the InP substrate, wherein the openings extend into the InP substrate from the upper surface of the InP substrate; a buffer layer is formed on the InP substrate, the buffer layer covers the opening to form an air gap, and the material of the buffer layer comprises InGaAs and / or InGaAsP; a laser function stack is formed on the buffer layer. According to the semiconductor laser and the manufacturing method, stress is released by introducing an air gap, a buffer layer with a larger lattice constant is obtained on the InP substrate, and a 2.1-2.3 [mu] m laser function lamination layer is grown by taking the buffer layer as a substrate, so that a laser epitaxial structure with large strain and high-quality material characteristics is obtained on the InP substrate.

The application relates to a self-sensing connecting piece with embedded intelligent aggregate and a connecting system, the connecting piece comprising a steel pipe (1), high-strength concrete (2) and piezoelectric intelligent aggregate (3); the high-strength concrete (2) is arranged in the steel pipe (1), and the piezoelectric intelligent aggregate (3) is arranged in the high-strength concrete (2); the connecting system comprises the self-sensing connecting piece with embedded intelligent aggregate, further comprises a first component and a second component, and the self-sensing connecting piece with embedded intelligent aggregate is arranged in the first component and connected with the second component. Compared with the prior art, the application provides the connecting piece with sufficient tensile bearing capacity and shearing bearing capacity, which can self-sense damage, and long-term and accurate monitoring of the performance of the connecting piece can be achieved.

An optical fiber acoustic wave sensitization structure disclosed by the present invention comprises a support, a flexible compliance member and a sheath optical fiber, the flexible compliance member is assembled on the support, the sheath optical fiber is wound on at least part of the surface of the flexible compliance member, the sheath optical fiber comprises a wire core and a sheath, the wire core is a standard single-mode optical fiber, the sheath wraps the wire core, and the flexible compliance member is assembled on the support. The Young modulus of the sheath is lower than the Young modulus of the wire core, the sheath is in contact fit with the flexible compliant component, under the action of external sound pressure, the sheath optical fiber can be directly coupled with sound waves to generate displacement and strain, and the flexible compliant component can deform along with the displacement and strain of the sheath optical fiber. The problems that in the prior art, sound wave energy coupling efficiency is not high, sensitivity is insufficient in a weak sound wave monitoring scene, and a standard single-mode optical fiber is prone to breakage and poor in stability in a complex stress environment are solved.

This application relates to a structural steel plate with a distinct yield plateau and its preparation method, belonging to the field of steel plate manufacturing technology. The chemical composition of the structural steel plate, by mass fraction, includes: C: 0.08%~0.18%, Si: 0.20%~0.40%, Mn: 1.00%~1.70%, P≤0.010%, S≤0.003%, Al: 0.020%~0.050%, Nb: 0.030%~0.110%, V: 0.050%~0.100%, Ti: 0.010%~0.030%, and the matrix element Fe. By optimizing the composition and process, without adding alloying elements such as Cu, Ni, Cr, and Mo, a large number of fine nanoscale Nb, V, and Ti precipitates are formed in the ferrite. These precipitates work synergistically through a dual mechanism: on the one hand, they strengthen the low dislocation density structure to improve the strength of the structural steel plate; on the other hand, they pin dislocations to induce a distinct yield plateau in the structural steel plate. By employing a specific high final cooling temperature process, the coiling or stacking cooling steps are eliminated, shortening the production process and expanding the production capacity of structural steel plate thickness specifications. Ultimately, this results in a significant reduction in alloy costs and an increase in production efficiency, forming a core technological advantage.

The application relates to a silver-coated copper particle, a preparation method thereof and application of the silver-coated copper particle in sintering paste, and belongs to the field of sintering materials. The application solves the problem of high sintering temperature of high-temperature solder in the prior art. The silver-coated copper particle is prepared by a multi-step chemical synthesis method, that is, silver-coated copper particle suspension is prepared first, and then a silver complex solution, a second chelating agent solution and a complexing agent solution are used to realize gradient structure evolution of the silver layer from compact to porous by controlling the release and reduction rate difference of silver ions, the surface of the silver-coated copper particle has a multi-stage pore structure, the contact resistance between particles can be effectively reduced, the sintering starting temperature can be effectively reduced, the poor oxidation performance of copper particles is solved, the silver consumption is reduced, the manufacturing cost is reduced, the ion migration path length and the electromigration life are increased, the silver-coated copper particle prepared by the application greatly meets the requirements of the electronic packaging field for new welding materials, and has remarkable social and economic benefits.