8results about How to "Avoid making" patented technology

The invention discloses a gallium nitride groove type MOSFET device and a preparation method thereof, and belongs to the field of semiconductor devices. The device comprises a substrate, an epitaxial structure formed on a first surface of the substrate, a gate dielectric layer formed on the epitaxial structure, a source electrode, a gate electrode and a drain electrode, the epitaxial structure comprises an n-GaN drift layer, a C-doped high-resistance GaN layer and an n +-GaN layer which are sequentially formed on the first surface of the substrate, the C-doped high-resistance GaN layer is located between the n-GaN drift layer and the n +-GaN layer, and the n +-GaN layer is located between the gate dielectric layer and the n +-GaN layer. And a high-resistance current blocking layer. The preparation method comprises the following steps: sequentially growing an n-GaN drift layer, a C-doped high-resistance GaN layer and an n +-GaN layer on a first surface of a substrate to form an epitaxial structure; forming a gate dielectric layer on the epitaxial structure; and forming a grid electrode, a source electrode and a drain electrode. Compared with the prior art, the C-doped high-resistance GaN layer is adopted to replace the Mg-doped p-GaN layer, preparation and activation of the p-GaN layer in a traditional method are avoided, and the vertical voltage endurance capability and the leakage current suppression capability of the device are effectively improved.

The utility model relates to the field of anchor rod drilling machine, specifically is a kind of anchor rod drilling machine auxiliary workbench, including workbench, the top of workbench is fixedly connected with fixed plate, the top of workbench is slidably connected with slide plate, the top of fixed plate is provided with limiting assembly, the side of slide plate is provided with clamping mechanism, the bottom of slide plate is provided with pusher assembly, limiting assembly includes mounting plate, the bottom of mounting plate is set on the top of fixed plate, the top of mounting plate is fixedly connected with connecting plate;The utility model is clamped to the component outside the anchor rod body by clamping mechanism, and is clamped and is limited to anchor rod body by limiting assembly, so that pusher assembly can smoothly drive slide plate and component to move together when using, and using the thread on component and anchor rod body and the reason that anchor rod body can rotate, component can be smoothly connected to the surface of rod body in turn.

This invention belongs to the technical field of automotive sub-instrument panel assembly processing, specifically relating to a rapid changeover processing device for automotive sub-instrument panel assemblies. The device includes a laser welding apparatus and a rapid changeover fixture. The rapid changeover fixture comprises a fixture base, a mounting block, a threaded plate, and a screw. The mounting block is slidably connected to the upper part of the fixture base. The threaded plate is fixedly installed below the fixture base and has threaded holes on its surface. The screw is threaded into the threaded holes and has two limiting blocks at its upper end. A mounting cavity is slidably connected inside the mounting block, with the two limiting blocks located on the upper and lower sides of the mounting cavity, respectively. This device solves the problem that current processing of automotive sub-instrument panel assemblies requires multiple processing devices for multiple models, significantly increasing costs. Furthermore, the processing devices used cannot achieve rapid changeover, leading to reduced production efficiency and negatively impacting the assembly's production quality.

The application discloses a preparation method of metrafenone, which comprises the following steps: (1) reacting 5,5-dimethyl-4,5-dihydroisoxazole-3-sulfonyl chloride under the action of a sulfite to obtain 5,5-dimethyl-4,5-dihydroisoxazole-3-sulfinate; (2) reacting the 5,5-dimethyl-4,5-dihydroisoxazole-3-sulfinate with a pyrazole intermediate 3 to obtain the metrafenone; wherein, a general structure of the pyrazole intermediate 3 is as follows: Y is halogen, or the application provides a new route for synthesizing metrafenone, avoids using hydrogen peroxide, meta-chloro peroxide benzoic acid, ozone and other oxidants to prepare the metrafenone in a traditional route, greatly reduces the production risk, improves process safety, and is suitable for large-scale industrial production.

This invention discloses a method for preparing powdered high-speed steel billets, the powdered high-speed steel billets themselves, and their applications, relating to the field of advanced manufacturing technology for metallic materials. This invention employs a high-frequency induction hot pressing sintering method to prepare powdered high-speed steel billets, enabling rapid manufacturing of these billets and achieving product performance comparable to that obtained through traditional hot isostatic pressing (HIP). Compared to traditional HIP methods, this process is simpler, has a shorter cycle time, and avoids the need for encapsulation, thus reducing costs and improving safety. The powdered high-speed steel prepared by this invention achieves a density of 98.5%, a microhardness of 365 Hv, and tensile strength and yield strength of 723 MPa and 687 MPa, respectively. This allows for short-process, low-cost preparation of powdered high-speed steel billets, which can be used to manufacture hardware cutters, mechanical molds, etc.

The invention relates to a synthetic method of substituted 2-nitrobiphenyl, and belongs to the technical field of organic synthesis.The method comprises the steps that under nitrogen protection, magnesium chips and substituted bromobenzene serve as raw materials to prepare a Grignard reagent; then, in the presence of a catalyst, carrying out coupling reaction on the Grignard reagent and o-nitrobenzene sulfonate; after the reaction is finished, post-treatment is performed to obtain substituted 2-nitrobiphenyl, and the substituted bromobenzene is parachlorobromobenzene or 3, 4, 5-trifluorobromobenzene. According to the method, substituted bromobenzene and o-nitrobenzene sulfonate are directly used as raw materials, the problems of multi-step operation and low yield of phenylboronic acid preparation in a traditional route are solved, meanwhile, precious metal is replaced with the cheap copper catalyst, the raw material cost and environmental protection pressure are remarkably reduced, and the method is short in reaction route, easy to operate, high in yield and suitable for industrial production. The method is suitable for industrial large-scale production.

The utility model provides a power track and a power track socket, and relates to the technical field of electrical connection devices. The power rail comprises a shell, a fixed connecting piece, a clamping piece and a first connecting piece. The fixed connecting piece is fixedly connected to one side of the shell and comprises a clamping part and a fixing part which are arranged at an interval; the clamping piece is used for being fixedly connected to the panel structure and connected with the clamping part in a clamped mode. The first connecting piece penetrates through the fixing part and is connected to the panel structure. Wherein the electric power track is connected to the panel structure through the cooperation of the clamping part and the clamping piece, or the electric power track is connected to the panel structure through the cooperation of the fixing part and the first connecting piece. According to the electric power track provided by the invention, the connection mode of the electric power track and the panel structure is expanded, the assembly flexibility of the electric power track socket can be improved, and an operator can select the corresponding connection mode of the electric power track and the panel structure according to user requirements.

The invention discloses a digital surveying and mapping analysis method for mounting a rail of a floating dock gate seat rail type crane by using a total station. The method comprises the following steps of: a, measuring data of a dock wall top deck at each rib position station at the rail through the total station; b, drawing a deflection curve of the dock wall top deck at the track in drawing software in a spline curve fitting mode according to the data; c, selecting a reference thickness cushion block value and a design slope value; d, linearly arranging the steel rails in the drawing software; e, measuring the accurate thickness value of the cushion block at the required position; according to the method for mounting the rail-mounted crane rail on the floating dock gate seat by using the digital surveying and mapping analysis method of the total station, repeated remanufacturing of cushion blocks with different thicknesses can be avoided, and in order to ensure the mounting precision of the crane rail, the mounting and adjusting working hours of the crane rail in a shipyard site are greatly reduced, so that the docking period is shortened.