498results about How to "Reduce chipping" patented technology

Provided is a method for producing a semiconductor chip, comprising applying a photothermal conversion layer on a light-transmitting support, provided that upon irradiation of radiation energy, the photothermal conversion layer converts the radiation energy into heat and decomposes due to the heat; laminating the semiconductor wafer and the light-transmitting support through a photocurable adhesive by placing the circuit face and the photothermal conversion layer to face each other, thereby forming a laminated body having a non-circuit face on the outside; grinding the non-circuit face of the semiconductor wafer until the semi-conductor wafer reaches a desired thickness; dicing the ground semiconductor wafer from the non-circuit face side to cut it into a plurality of semiconductor chips; irradiating radiation energy from the light-transmitting support side to decompose the photothermal conversion layer, thereby causing separation into a semiconductor chips having the adhesive layer and a light-transmitting support; and optionally removing the adhesive layer from the semiconductor chips.

In the invention, the composite bullet-proof armour plate consists of a metal panel, a honeycomb core board, a ceramic wafer core and a metal rear panel bonded with the metal brazing layer via the organic adhesive layer. The preparing method is that using the brozing and the line-cutting method are finished the honeycomb core board and the plain or curved ceramic wafer core, whose size must fit in that of the honeycomb hole of the honeycomb core board. The panel and the rear panel must be made of the bullet-proof steel plate through heat treating after cold rolling. The Ag72Cu metal brazing material and the epoxy resin group high strength structural sizing for connecting the interface are assembly welded.

The invention discloses a graphene grinding and stripping device which comprises an upper grinding disc, a lower grinding disc, a driving mechanism for driving the upper grinding disc to rotate, and a material collection mechanism for collecting a product after grinding, wherein the upper grinding disc and the lower grinding disc are matched with each other; a horizontal contact surface is formed between the upper grinding disc and the lower grinding disc, the upper grinding disc is provided with an upper feed inlet, the lower grinding disc is provided with a lower feed inlet, the upper feed inlet and the lower feed inlet are both connected with the contact surface between the upper grinding disc and the lower grinding disc, and the lower end of the lower feed inlet is in sealed connection with one water inlet tube; moreover, the upper end face of the lower grinding disc is provided with a groove, and an annular region formed by rotary surrounding of the lower end of the upper feed inlet is surrounded in the groove. The graphene grinding and stripping device can realize large-size successful stripping of graphene. The invention also relates to a graphene production system containing the graphene grinding and stripping device and a graphene production method.

The invention discloses a diamond grinding wheel for cutting a silicon crystal circle and a preparation method thereof. The method comprises the following steps: (1) preprocessing an aluminum alloy basal body; (2) configuring electroforming liquid: configuring the electroforming liquid according to the weight ratio of (38-43):(15-20):(43-57):(50-180):(4-8) of nickel sulphate, cobalt sulphate, deionized water, a diamond grinding material and a suspending agent; fully stirring evenly and obtaining the electroforming liquid; (3) carrying out insulation processing on the aluminum alloy basal body obtained in the step (1), putting the aluminum alloy basal body into the electroforming liquid, electroforming in an ultrasonic field, evenly precipitating the diamond grinding material in the electroforming liquid and metal on the basal body together and obtaining a grinding wheel blank body with a compound electroforming layer; and (4) taking out the grinding wheel blank body completing electroforming, and carrying out accurate processing on the grinding wheel blank body on a numerical control grinder and a numerical control lathe respectively according to the accuracy requirements of the required basal body and the required cutting edge. The diamond grinding wheel obtained by the invention meets the ultrathin and superfine technical conditions and also has favorable strength and rigidity.

The invention provides a high-efficiency low-cost solar cell diffusion technology, which is a multi-step variable temperature diffusion and annealing technology under the protection of small-flow nitrogen, and is characterized by adopting the following eight steps of diffusion processes under the protection of small-flow nitrogen: step 1, ultralow temperature boat entering process; step 2, constant temperature field process; step 3,variable temperature oxidation process; step 4, fixed temperature diffusion process; step 5, variable temperature diffusion process; step 6, knot pushing diffusion process; step 7, variable temperature annealing process; step 8, ultralow temperature boat exiting process. Compared with traditional constant temperature diffusion technology, the high-efficiency low-cost solar cell diffusion technology provided by the invention shortens diffusion technology time, reduces technology gas cost, improves uniformity and repeatability of diffusion sheet resistor.

The invention discloses a method for machining slotted holes on carbon fiber laminated boards, which belongs to a machining method for nonmetallic materials, solves the problem that by the existing milling and drilling methods, carbon fiber laminated boards are easy to laminate, split and burn, and aims at improving the machining precision of carbon fiber composite products and reducing the surface roughness of carbon fiber composite products. The method disclosed by the invention comprises a clamping step, a machining step and a post-processing step, wherein the machining step is one or two of a milling machining step and a drilling machining step. According to the invention, in the machining process, a non-deformed clamping mode is used, and through selecting reasonable cutting tool materials, geometric parameters of cutting tools, and milling and drilling machining parameters, the appearance allowances in machining are reasonably arranged, thereby solving the quality problems of laminating, splitting and burning and the like existing in the process of opening or drilling carbon fiber thin-wall revolution bodies and carbon fiber laminated boards by using the traditional methods, so that the qualified rate of carbon fiber parts is increased from 50% to more than 99%.

The invention discloses a lithium sulfur battery anode material and preparation method thereof, melamine formaldehyde resin rich in nitrogen is taken as a carbon source and nitrogen source, a nitrogen-rich hollow eggshell with the diameter of 100-300 nm is prepared with a nanometer SiO2 casting method, the interfacial adsorption of polysulfide is enhanced by the aid of the combined effect of physical adsorption and chemical adsorption, migration and shuttle effects of the polysulfide are effectively restrained, and charge and discharge stability of a lithium sulfur battery is enhanced. At the same time, an eggshell structure is formed after the hollow eggshell is filled with sulfur, and an interior gap exists between a sulfur inner core and a polymer shell so as to accommodate volume expansion in a sulfur atom lithiation process. The lithium sulfur battery anode material is applied to preparation of a lithium sulfur battery anode and the lithium sulfur battery. The lithium sulfur battery has excellent cycle performance and capacity retention ratio.

The invention relates to a casting method. Ceramic anti-wearing grains are used for replacing fireproof materials, and a liquid coating formed by mixing the ceramic anti-wearing grain and a binding agent is coated on the surface of a module to prepare a section mould; a fired mould is smelted, and alloy liquid is injected; a casting piece is formed along with the cooling and the condensation of the injected alloy liquid; the ceramic anti-wearing grains are led to the surface of the casting piece to carry out heat treatment so as to increase one layer of a ceramic hardening layer on the surface of the casting piece and improve the surface hardness of the casting piece. With the adoption of the casting method, the casting piece is formed for one time, the surface is smooth and clean, and the size is accurate, so that the aim of less cutting or no cutting is achieved; and the surface is provided with the ceramic hardening layer, and the hardness is greatly improved, so that the casting method is particularly suitable for preparing an alloy casting piece such as a gear, which need higher surface hardness.

The invention discloses a method for preparing a tungsten-copper alloy based on a loose-loading infiltration method. The method comprises the following specific steps of: one, grain size selection of tungsten powder, copper powder and nickel powder; two, material mixing, namely calculating the masses of the tungsten and the copper according to the mass percentage of the tungsten-copper alloy to be prepared, weighing the tungsten powder, weighing the nickel powder which accounts for 0.05 to 0.15 percent of the total mass of the tungsten and the copper and weighing ethanol which accounts for 5 to 15 percent of the total mass of the tungsten and the copper according to the grain size selected in the step one, weighing pre-adding copper powder which is 5 percent of the total mass of the tungsten and the copper, and mechanically mixing the tungsten powder, the nickel powder, the ethanol and the pre-adding copper powder weighed in the step together; three, die-filling, namely filling the mixed powder into a graphite die, dropping gasoline into the die, and tamping the mixture to obtain a blank material; four, infiltration sintering, namely performing the infiltration sintering in a sintering furnace; and five, demoulding. The tungsten-copper alloy prepared by the method has sizes, shapes and components of any requirements, and is prepared without a steel die and a special pressing or forming device.

The invention relates to a method for a MEMS wafer. The cutting method comprises the following steps of pasting a membrane on the front surface of the wafer to protect an MEMS structure; focusing a laser on the inner part of the wafer, irradiating to form a modified layer at a position from the front surface of the wafer to the inner part of the wafer; irradiating the laser to the back surface of the wafer at a position corresponding to that of the modified layer so as to form a mark groove on the back surface of the wafer; performing water jet cutting on the back surface of the wafer along the position of the mark groove but do not reach the bottom so as to form a water jet cutting groove from the back surface of the wafer to the inner part of the wafer, wherein one end far away from the back surface of the wafer of the water jet cutting groove is connected with the modified layer; and extending splits along the modified layer till to all the MEMS structures are separated completely from each other. The method for the MEMS wafer combines the advantages of laser irradiation and water jet cutting, and realizes the edge breakage-free and low-contamination cutting for the MEMS wafer.

The invention relates to a small underwater cable cutting device which comprises an oil cylinder barrel, wherein a piston rod is mounted inside the oil cylinder barrel; a movable cutting knife is connected with one end part of the piston rod through a shaft pin and a set screw; a guiding frame is connected with one end of the oil cylinder barrel; after extending out of the guiding frame, the movable cutting knife is matched with a fixed cutting knife to cut off a cable; the fixed cutting knife is mounted on the bottom surface of the guiding frame; two limiting frames are correspondingly mounted on the upper surface of the guiding frame and the lower surface of the fixed cutting knife; one end of the upper limiting frame and that of the lower limiting frame are simultaneously connected witha vertically-mounted gasket; the movable cutting knife and the fixed cutting knife are positioned between the two limiting frame; and the gasket is positioned between the movable cutting knife and the fixed cutting knife. By the adoption of the small underwater cable cutting device provided by the invention, the technical problem that a conventional underwater cutting device is complex in structure, large in weight and occupied space, high in operating difficulty and low in autonomous operability can be solved; the space can be greatly saved; and the underwater cutting efficiency can be improved.

The present invention relates to forging technology, and is especially valve rod forging and cold extruding formation process. The valve rod as the part of valve is one rod, and has one thicker end with slots as the head, the other end with thread and one middle part of smooth rod. The formation process includes the steps of cutting rod, end chamfering, slotting in the head, chamfering the sealing surface, chamfering the root of the thread part, cold extruding threads, rolling the smooth rod, etc. The production process has saving in material, high production efficiency and low cost.

Provided is a small deformation wind tunnel train balance, comprising a rod-type balance and a support pole. Two ends of the rod-type balance have a conical structure. A balance element is arranged between the two ends of the rod-type balance. The balance element has a conical structure, which is provided thereon with a five-component element adjacent to the large-end part and a resistance element adjacent to the small-end part. The support pole comprises a conical front end and a straight segment. The rod-type balance and the conical front end of the support pole are matched via a conical surface and are tensioned via a wedge. The rod-type balance is arranged in an inner cavity of a tested model. The minimum diameter of the inner cavity of the tested model is greater than the maximum diameter of the rod-type balance. The invention breaks through the traditional equal-diameter balance support rod design method and the three-segment type rod-type balance structure, increases the diameter of the balance, shortens the balance length, realizes little deformation of the balance, improves the rigidity and the bearing ability of the balance, is applicable to balance development for wind tunnel experiments with large impact load or severe vibration, and achieves good practicability and popularization values.

The invention discloses a rotary graphene stripping device including a rotary cylinder body; a top cover is arranged above the rotary cylinder body, a bottom cover is arranged below the rotary cylinder body, the top of the top cover is provided with a feed inlet, the bottom of the bottom cover is provided with a discharge port, and the feed inlet is communicated with the interior of the rotary cylinder body; the outer side of the rotary cylinder body is provided with a first motor, and is used for driving the rotary cylinder body to horizontally rotate; the rotary cylinder body is also internally provided with an inner cylinder, and a second motor used for driving the inner cylinder to horizontally rotate in a direction opposite to the rotating direction of the rotary cylinder body is arranged below the rotary cylinder body; the upper part of the inner cylinder is shrunk in a certain angle, and a material storage space is left between the upper part of the inner cylinder and the upper part of the rotary cylinder body; the lower part of the inner cylinder and the lower part of the rotary cylinder body are in clearance fit to be used for grinding graphite sheets, and a clearance between the lower part of the inner cylinder and the lower part of the rotary cylinder body is successively decreased downward along the axial direction of the rotary cylinder body. The rotary graphene stripping device can achieve successful stripping of graphene. The invention also relates to a graphene production system containing the rotary graphene stripping device and a graphene production method.

An extruded light-weight blade support with a blade for a figure skate including an extruded holding means having a first portion and a second portion and a blade removably mounted to the extruded holding means. The first and second portions may be mounted to the figure skate. The extruded holding means may be made from aluminium and the blade may be made from a light-weight alloy such as titanium or magnesium. A strip of carbon steel may be adhered to a bottom edge of the blade

The invention discloses a virus detection kit. The virus detection kit comprises a kit body, a storage plate is fixedly arranged at the lower end in the kit body, test tubes are slidably connected ina storage plate through reserved storage holes, rubber pads are placed in the storage holes, sleeves are fixed at the lower ends of the storage holes in a welded mode, sliding rods are slidably connected in the sleeves, springs are fixed at the lower ends of the sliding rods in a welded mode, bottom plates are fixed at the upper ends of the sliding rods in a welded mode, and the rubber pads are arranged at the upper ends of the bottom plates. According to the virus detection kit, through shock absorption of the rubber pads of the springs, the possibility of test tube cracking is effectively reduced and reagent is prevented from flowing out; and by directly connecting a sealing facility with a box cover, the used test tubes can be sealed while the box cover is closed, and no test tube can be missed.

The invention relates to finish-coat-free matte water-based colored paint and a preparation method thereof and belongs to the field of building paint. According to the paint provided by the invention, styrene-acrylic emulsion, a phosphate type dispersant, cellulose, a colloidal solution and polyamide wax have a common effect so that color points are stable and the suspension property is high; COASOL and two types of silicone modified acrylic emulsion with obvious particle size difference, and the polyamide wax are used as continuous phases of multi-colored paint; compared with traditional finish-coat matte water-based multi-colored paint, matting powder does not need to be added into the multi-colored paint and matte finish-coat varnish does not need to be brushed, and the matting and vintage effects can also be realized; the finish-coat-free matte water-based colored paint has excellent water resistance, water white resistance and storage stability; the disadvantages of traditional finish-coat matte water-in-water multi-colored paint are successfully overcome; the finish-coat-free matte water-based colored paint is applicable to non-plane matte water-based water-in-water paint and finish-coat-free matte multi-colored paint and the like.

The invention discloses a processing method and device of a transparent material, and provides an optical fiber laser of which the wave length is 1020 nm to 1090 nm. The processing method is characterized in that laser beams output by a seed laser are subjected to energy amplification through an optical fiber amplifier, laser pulse trains are output, each pulse train comprises at least two laser pulses, pulse width is smaller than 200 ps, peak power of the pulses is larger than 100 kW, the time among the laser pulses in each pulse train is smaller than 90 ns, the interval among the pulse trains is larger than 240 ns, and the total pulse number in each second is larger than 50,000, wherein ultrafast laser beams output by the laser are subjected to energy amplification only through the optical fiber amplifier; and the laser is focused on a to-be-processed position of the transparent material, a focus position is moved, processing is carried out according to a set track, a focus point isgradually risen, and the transparent material is processed from bottom to up. According to the processing method, material removal efficiency can be greatly improved, a heating or etching follow-up procedure is not required, and bevel angles are avoided.