10results about How to "Stable thickness" patented technology

This application discloses a semiconductor structure and its fabrication method, relating to the field of semiconductor technology. The fabrication method includes: providing a substrate, the substrate including a first device region and a second device region spaced apart; forming an initial stacked structure on each device region, the initial stacked structure including an initial gate structure and a first dielectric layer, the first dielectric layer being located on the side of the initial gate structure away from the substrate; using the first dielectric layer of the first device region as a mask, forming a device filling trench in the first device region; forming a first source / drain electrode in the device filling trench, and removing the first dielectric layer of each device region; forming a second source / drain electrode in the second device region. This stabilizes the gate thickness corresponding to the initial gate structure, improving the performance of the semiconductor structure.

This invention discloses a composite preform for aluminum-steel induction brazing, a welding method, and an anode guide rod assembly. The composite preform includes an aluminum base skeleton and annular brazing filler metal on its upper and lower surfaces. The aluminum base skeleton is disc-shaped with through holes, through which the annular brazing filler metal is connected as a whole. The annular brazing filler metal includes an inner ring wetting zone, a middle ring control zone, and an outer ring compensation zone, with the solid-liquid phase temperature of the brazing filler metal increasing sequentially in these three zones. During welding, a two-stage induction heating process is employed: first, the inner ring brazing filler metal is fully softened and spread in the central region; then, the outer ring brazing filler metal is completely melted and fed to the joint edge, while a controlled Fe-Al-Si reaction layer is formed at the steel-side interface through the middle ring control zone. This invention transforms the inherent radial temperature difference of induction heating into a step-by-step melting process window, simultaneously solving the problems of insufficient central spreading, edge brazing filler metal loss, and uncontrolled brittle phase at the interface. It is suitable for large-section connections between anode steel claws and aluminum guide rods in the electrolytic aluminum industry.

The invention relates to the field of advanced non-ferrous metal material high-heat-insulation coating protection, in particular to a composite oxide ceramic coating preparation method based on an electrophoretic deposition technology. Firstly, the heat-resistant steel surface is pretreated, and surface oil stains and oxidation impurities are removed; then a nickel-based electroplating solution containing rhenium chloride and ruthenium chloride is prepared, the pretreated heat-resistant steel part is placed in the nickel-based electroplating solution to be subjected to electro-deposition, and a nickel-rhenium-ruthenium composite metal bonding layer is formed on the surface of the nickel-based electroplating solution; then preparing a composite ceramic suspension, taking acetonitrile as a solvent, taking 3, 3-dimethoxypropionic acid as an additive, containing YSZ powder and nano ruthenium dioxide-rhenium oxide mixed powder, and putting the part with the metal bonding layer into the suspension for electrophoretic deposition to form a composite oxide ceramic coating precursor; and then the ceramic coating is placed in a high-temperature furnace protected by inert gas to be sintered, interface fusion of the bonding layer and the ceramic coating and densification of the ceramic coating are achieved, and the ceramic coating has excellent heat insulation performance and strong interface bonding force.

The utility model provides a rotational flow synergistic tray, which relates to the technical field of flue gas treatment equipment, and comprises a rotational flow area and cofferdams arranged upwards on the edges of the rotational flow area, the rotational flow area comprises a bottom plate and a plurality of rotational flow elements which are uniformly distributed on the bottom plate; a circular blocking area is arranged in the center of the cyclone, a plurality of truncated fan-shaped cyclone blades are arranged on the outer side of the circular blocking area in the circumferential direction, and the truncated fan-shaped cyclone blades are bent upwards along the truncated radius of the truncated fan-shaped cyclone blades to form a spiral shape; and the cyclone directions of the plurality of cyclones on the bottom plate are the same. The cyclone synergistic tower is arranged below a spraying layer or among a plurality of spraying layers in the desulfurization tower in a layered manner, when flue gas passes through the cyclone from bottom to top, the flue gas can be uniformly distributed and the gas-liquid mass transfer can be enhanced, and meanwhile, desulfurization slurry sprayed by the spraying layers can be dynamically and uniformly distributed in the cyclone synergistic tower tray through the flow guide structures of the cyclone synergistic tower tray, so that the desulfurization efficiency is improved. Flue gas short circuit caused by slurry bias current is avoided, and the desulfurization efficiency of the desulfurization tower can be effectively improved.

The invention discloses an insulation sheet production process. The insulation sheet production process comprises the following steps: S1, raw material selection; s2, raw material pretreatment; s3, co-extrusion outflow and tape casting are carried out; s4, online monitoring and post-processing are carried out; in the step S1, the insulating sheet comprises a functional surface layer A, an insulating layer and a functional surface layer B which are stacked in sequence, and the functional surface layer A is prepared from polymer particles A and filler A; the functional surface layer B adopts low-melting-point polyolefin to realize a hot melting bonding function; the insulating layer is made of polymer particles C and filler C; the raw materials also comprise key auxiliary agents such as an antioxidant and an ultraviolet light absorber. According to the production process of the insulating sheet, through the three-layer design of the functional surface layer A, the insulating layer and the functional surface layer B, the single insulating sheet simultaneously has multiple functions of surface protection, core insulation, hot melting bonding and the like.

The invention relates to the technical field of guide wheel ceramic plating, in particular to bus bar traction guide wheel ceramic plating equipment which comprises a base, and a vacuum tank communicated with a vacuum pump set is fixedly connected to the surface of the base. According to the bus bar traction guide wheel ceramic plating equipment, an operator only needs to sleeve the guide wheels into the placing rods in sequence, and the dead weight of the guide wheels during falling can trigger a pneumatic chain reaction. The first guide wheel presses the lowermost limiting block to drive the pressed pneumatic piston rod, compressed gas of the first guide wheel pushes the upper-stage ejection pneumatic piston rod through the pipeline, and therefore the upper side edge limiting mechanism is pushed out of the inner groove and exactly abuts against the upper surface of the guide wheel to form limiting. And the guide wheels are automatically and repeatedly placed along with successive placement of the guide wheels, and finally all the guide wheels are automatically separated and axially positioned by the side edge limiting mechanisms which extend out in pairs. Rapid batch feeding of multiple workpieces is achieved, it is ensured that constant isolation space exists between the workpieces, and preconditions are created for subsequent uniform coating.

The invention belongs to the technical field of preparation of high-purity metal materials, and particularly relates to a preparation method and device of high-purity selenium. The preparation method of the high-purity selenium comprises the following steps: under a protective atmosphere, immersing a first crystallization rod and a flow baffle into a melt of a raw material selenium, then carrying out first-stage rotary crystallization, and taking out the first crystallization rod to obtain a first-stage crystallization product; and under the protective atmosphere, immersing a second crystallization rod and a flow baffle into the melt of the primary crystallization product, and then carrying out secondary rotary crystallization to obtain high-purity selenium of more than 6N on the second crystallization rod, the crystallization rate of the first-stage rotary crystallization is 0.1-0.5 mm / h, the crystallization rate of the second-stage rotary crystallization is 0.5-1.5 mm / h, and the thickness of a solid-liquid boundary layer is less than or equal to 50 microns. The flow baffle is added in the rotary crystallization process to strengthen convection of the melt, the thickness of a boundary layer of a solid-liquid interface is reduced, and impurity diffusion is accelerated; the crystallization rate is controlled to improve the crystallization efficiency, the product purity is improved through two times of crystallization, and the obtained product is high-purity selenium of more than 6N.

The invention belongs to the technical field of production control, and discloses a plastic strip automatic production control system based on full-process parameter monitoring, which comprises an operation parameter monitoring module used for collecting operation parameter information of the operation state of a hot-pressing extruder and performing time synchronization and continuous reconstruction to form continuous extrusion operation state description; the plastic strip forming module calculates the instantaneous thickness of the plastic strip based on the extrusion operation state description, and compares the instantaneous thickness with a preset target thickness to obtain a thickness offset; the traction speed is adjusted in real time according to the thickness offset, and thickness stable interval parameters are output; the cutting pitch control module is used for determining a theoretical cutting pitch matched with the running linear speed of the plastic strip on the basis of the thickness stable interval parameters, and constructing a consistency constraint function to calculate and obtain a constraint value; and the stability and the automation level of the plastic strip production process are improved.

This invention discloses an ultra-wide width EPE foam and its preparation method. The ultra-wide width EPE foam, by weight, is composed of 100-155 parts resin matrix, 1-3 parts nucleating agent, 10-19 parts modified calcium carbonate, 10-20 parts foaming agent, and 10-25 parts additives. The specific preparation steps are as follows: Step 1, material preparation and mixing; Step 2, initial mixing; Step 3, foaming agent injection; Step 4, blending; Step 5, foaming; Step 6, cooling and shaping; Step 7, winding and forming. This invention, through formula adjustment, molding process optimization, and equipment innovation, utilizes a twin-screw extruder to achieve extrusion molding, effectively overcoming the process limitations of traditional wide width EPE foam preparation, improving product quality stability and production efficiency, and laying the foundation for its large-scale application in multiple fields. The product can be widely used in the packaging industry, construction industry, automotive interiors, and many other fields.