67results about How to "Wide range of applicable materials" patented technology

The invention relates to a preparation method of a three-dimensional artificial random porous structure tissue engineering scaffold, belonging to the technical field of biomaterials. The invention aims to solve the design and manufacturing problems of the bionic structure of tissue engineering scaffold, provides a design method for constructing a random distributed scaffold porous structure with a bionic shape under expected porosity and pore size requirements, and molds by using a 3D additive manufacturing method to produce tissue substitute. The preparation method provided by the invention has the following advantages that the scaffold has a 3D through-hole structure meeting bionic requirements, and ensures nutrient substance transfer and waste metabolism and has certain bionic mechanical properties; the porosity and pore size distribution range of the scaffold can be conveniently controlled, and the random pore structure with expected function gradient is constructed to realize the bionic characteristic of the structure; and the method is suitable for a large range of materials such as metal materials, non-metal materials and medical high molecular materials, and can meets user-personalized tissue repair requirements.

The invention relates to an embedded stirring friction spot welding method which can be used for the overlapping spot welding of heterogeneous or homogeneous metal and is particularly suitable for theoverlapping between aluminum or magnesium and a harder heterogeneous metal material. The method comprises the following procedures: firstly, drilling on a harder second base material in advance and tapping in a hole or respectively drilling two coaxial holes with unequal diameters on both surfaces of the harder second base material; adopting a subplate with a glenoid die on light holes with equaldiameters; then assembling in an overlapping form and demanding that an aluminum plate is arranged above the harder second base material and the hole of the harder second base material, which has a small diameter, is arranged at the upper side; starting a pin-free type stirring head to rotate and leading the pin-free type stirring head to be in contact with the surface of an upper base material;limiting the press depth of the stirring head within 0.25-1 mm or so without penetrating through the welding interface; rubbing for several seconds and then rotatably extruding an upper plate into thehole of a harder lower plate to finish welding. Compared with the traditional stirring friction spot welding technology, the method prevents the abrasion of the hard second base material on a tool, prolongs the service life of the tool, has no keyhole on a joint and has smooth appearance.

The invention discloses a high-speed continuous photocuring type 3D printing device and a working method thereof. The 3D printing device comprises a machine case body which is divided into an upper cavity and a lower cavity by a middle partition board, wherein an image forming module is arranged in the lower cavity, a window box and an oxygen supply cooling module are arranged in the upper cavity and are combined to be fixedly mounted on the middle partition board, the oxygen supply cooling module is arranged right below the window box, and the image forming module I is arranged right below the window box; a printing platform is arranged right above the window box and is mounted on a Z-direction worktable; and the window box is connected with a raw material feeding unit. The 3D printing device is integrated with the advantages of a compound oxygen-rich film, oxygen supply cooling and liquid surface auxiliary pressurization of the window box, so that the low-cost and efficient continuous printing of large-sized products with arbitrary shapes is realized, the range of applicable materials is wide, the printed products are high in precision and quality and good in uniformity, and the process is stable and reliable. An industrial-grade solution is provided for the high-speed continuous photocuring type 3D printing.

The invention discloses a forming window for high-speed continuous photocuring 3D printing. The forming window applied to a photocuring 3D printer comprises a window box and an oxygen supply cooling module. The photocuring 3D printer is divided into an upper cavity and a lower cavity through a middle partition. The window box and the oxygen supply cooling module are arranged in the upper cavity of the case of the photocuring 3D printer. The window box and the oxygen supply cooling module are fixedly mounted on the middle partition in a combined manner. Two ends of an oxygen supply cooling chamber are respectively connected with a cooling gas inlet pipeline and a cooling gas outlet pipeline, and the oxygen supply cooling chamber, the o cooling gas inlet pipeline and the cooling gas outlet pipeline form the oxygen supply cooling module. The forming window has the advantages that low-cost and efficient continuous printing of large-size optional-shape parts can be achieved, the forming window is wide in applicable materials, the precision and quality of the printed parts are high, the printed parts are good in consistency, and process stability and reliability are achieved. In addition, the forming window is high in industrial application value and applicable to a desktop-level 3D printer and industrial 3D printing.

The invention belongs to the technical field of chemical cleaning of metal surfaces, and particularly relates to a metal surface cleaning anti-scaling agent containing compound acid. The agent comprises two or more components in parts by weight as follows: 70-98 parts of sulfamic acid, 0.05-20 parts of glycolic acid, 0.05-20 parts of tartaric acid, 0.05-20 parts of lactic acid, 0.05-20 parts of gluconic acid, 0.05-20 parts of salicylic acid, 1.5-1.8 parts of a sulfamic acid corrosion inhibitor and 0.2-0.45 part of a surfactant. The agent utilizes sulfamic acid as the main pickling potion, the material status is solid, therefore the transportation is convenient, the cost is low, the pickling temperature is low, the implementation is facilitated, and time, labor and energy are saved. During water washing after pickling, the temperature difference born by a water wall can be reduced greatly under the condition of insufficient heat source capacity, and the protection of the water wall is facilitated. The agent is further provided with characteristics of simple postprocessing, low cleaning cost, and the like, can be applied to chemical surface cleaning of various metal materials such as carbon steel, stainless steel, alloy steel and the like, and can be widely applied to chemical cleaning of various large-capacity boilers and heat exchangers.

The invention relates to powder material quantitative feeding devices, and in particular relates to a dual-channel star-shaped feeder. The dual-channel star-shaped feeder comprises a dual-cavity shell, two star-shaped impellers and a deceleration motor, wherein the dual-cavity shell consists of a sharing feeding hole, two unique discharging openings and two middle cylindrical cavities arranged in parallel, the two unique star-shaped impellers are respectively arranged in the two cylindrical cavities, and output shafts of the two star-shaped impellers are respectively arranged in shaft holes of the two shaft-mounted deceleration motors; and blades of the star-shaped impellers are elastic blades, the plurality of elastic blades and the end parts of the impellers form star-shaped bays, a floating seal structure is arranged between the outer edge of a baffle of the end part of each impeller and the dual-cavity shell, and the feeding hole and the discharging openings of the dual-channel star-shaped feeder are separated through the floating seal structure. The dual-channel star-shaped feeder disclosed by the invention divides one path of material flow into two paths of quantitative feeding of any proportion, any flow and controllable material flow, has the characteristics of pressure isolation, high temperature resistance and long service life, and solves a material feeding problem of changing a dual-path single system to be a dual-path double system.

The invention discloses a continuous surface exposure ceramic 3D printing device and a working method thereof. Before printing, a raw material feeding unit pours ceramic slurry into a window box; after a water pump pulls out the ceramic slurry in a first slurry tank, the ceramic slurry is conveyed into a second slurry tank through a second slurry conveying pipeline, the ceramic slurry in the second slurry tank flows into aliquidstorage tank of the window box through the second slurry conveying pipeline, the ceramic slurry in the liquid storage tank of the window box flows into the first slurrytank through the first slurry conveying pipeline, and the circulation flow of ceramic slurry in the first slurry tank, the liquid storage tank, and the second slurry tank is realized throughthe waterpump; and the continuous surface exposure technology is adopted, continuous molding of ceramic 3D printing is realized, and continuous printing is realized.

The invention discloses a preparation method of a co-injection multi-layer structure part. The preparation method of the co-injection multi-layer structure part comprises the following steps of respectively mixing and granulating powder A and powder B formed by mixing bonding powder B1 and strengthening powder B2 with a binder to obtain uniform feeds A and B; then sequentially injecting the two feeds into a mold cavity by utilizing a co-injection molding technology to obtain a product green body, and removing the binder in the green body through a degreasing process; and finally, carrying out co-sintering densification and annealing heat treatment so as to obtain the multi-layer structure part. The preparation method of the co-injection multi-layer structure part provided by the invention has the advantages of being free of component limitation, high in interface bonding strength, simple in process, suitable for large-scale production and the like, is beneficial to improving the comprehensive performance of parts, solves the problems of large component limitation, low interface strength, complex process, high cost and the like in the prior art, and is very suitable for preparing multi-layer structure parts.

The present invention discloses the preparation of micron/submicron micro lens array on polymer surface and belongs to the field of nanometer/micron micro structure material and preparing technology. The preparation process is combination of self-assembling process and pressure molding process, and includes the first preparation of micron/submicron print die plate via combination of colloid crystal template and hot treatment technology, and the subsequent hot press demolding to prepare micron/submicron micro lens array. The present invention has the advantages of low cost, simple technological process and apparatus, capacity of mass production, high micro lens performance, etc.

The invention discloses a method for connecting two thin plates by using a countersunk riveting bushing, and aims at providing a method which is simple in structure and high in reliability, is capable of decreasing the opening number of thin plates and is suitable for the connection of different thin plate materials. The method is realized through the technical scheme as follows: the lower end of the countersunk riveting bushing for connecting an upper thin plate with a lower thin plate is cylindrical and the upper end thereof is inverted truncated cone-shaped; the wall thicknesses of the upper end and lower end are the same; a connection hole for fixing the thin plates is combined with an external mounting hole; the contact surfaces of the upper and lower thin plates are coated with glue to be adhered and fixed; a through hole and a double-sided countersink are formed in a thick plate; a countersink in the upper surface of the upper thin plate is matched with the truncated cone-shaped appearance of the upper end of the bushing; a 90-degree countersink is formed in the lower surface of the lower thin plate; the upper end of the countersunk riveting bushing is mounted in the countersink of the upper thin plate; at the lower end of the bushing, a riveting tool is used for expanding the 90-degree countersink of the lower thin plate; a countersunk rivet penetrates through a through hole in the countersunk riveting bushing so as to fix a riveted assembling component onto a mounting platform; the upper thin plate and the lower thin plate are connected to form the assembling component.

The invention discloses a component sprayed with a condensed heat dissipation membrane. Pelleted and selected silicon carbide which is prepared with a weight filling proportion substance, and accounts for 25%-30% of the total amount, teflon resin which is prepared with the weight filling proportion substance and accounts for 10% of the total amount, and a ketone/alcohol dilute material which is prepared with the weight filling proportion substance and is 60%-65% of the total amount are commonly mixed, stirred, and sprayed on the surface of a workpiece to be subject to heat dissipation, and are dried and condensed into a spraying material of the heat dissipation membrane with predetermined thickness, thus simply improving heat dissipation efficiency, and lowering the dependence on a large heat dissipation piece; the component has economical cost, is easy for recycling, and does not need high-pollution anodic antioxidant processing, and has good acid and base resistance and weather fastness.

The invention discloses a method for improving the high-temperature creep resistance of rare-earth-containing magnesium alloy by virtue of anomalous twin crystals. According to the method, the rare-earth containing magnesium alloy is subjected to predeformation treatment in the direction forming a 15-75-degree angle with the normal direction of a base plane at 25-300 DEG C, the true strain amount is 0.001-0.1, {10-12} anomalous twin crystals are prearranged in the rare-earth-containing magnesium alloy through deformation, the rare-earth-containing magnesium alloy with the prearranged anomalous twin crystals and rare-earth-containing magnesium alloy without prearranged anomalous twin crystals are subjected to stretching or compression creep property testing correspondingly within the temperature range from 200 to 350 DEG C, compared with the rare-earth-containing magnesium alloy without anomalous twin crystals, the rare-earth-containing magnesium alloy with the anomalous twin crystals has the advantages that the creep stain is obviously reduced, the steady-state creep rate is obviously lowered, and the creep resistance of is remarkably improved under the equal service conditions. The process which is reasonable in design, low in equipment requirement, convenient to operate, low in cost, high in efficiency and capable of stably improving the high-temperature creep resistance of the rare-earth-containing magnesium alloy is provided.

The invention provides an electric-arc additive manufacturing repair method adopting an auxiliary forming plate structure. The problems that in the existing electric-arc additive manufacturing repairprocess, especially, under the large-area defect additive manufacturing repair working condition, the situation that forming is poor due to the fact that metal flows and is insufficient in constraintoccurs in the open type multi-layer multi-pass stacking process are solved. In the electric-arc additive manufacturing repair process, metal inert gas arc welding (MIG), tungsten inert gas arc welding(TIG) and plasma welding electric arcs are adopted as a heat source, by adding wires, the defect portion is subjected layer-by-layer cladding repair, and under the control of a program, the defect portion of a metal part is gradually formed from line to surface to body according to a three-dimensional digital model. According to the electric-arc additive manufacturing repair method adopting the auxiliary forming plate structure, one or more auxiliary plate structures of which the material is the same as the parent metal are adopted, the auxiliary plate structures and a metal parent part forma repairable zone through spot welding, then, the repairable zone is completely welded through the multi-layer multi-pass stacking method, and finally, auxiliary plates are removed through the machining method.

The invention relates to a method for manufacturing a micro-spring by using a fracture control method. According to the method disclosed by the invention, the micro-spring is manufactured on the basis of controlling three-dimensional fracture. The method comprises the following steps of: coating a layer of oxide sol on a hard fiber material of which the diameter is of a micron scale; forming a core-shell-structure spindle knot taking the hard fiber material as a core and the oxide sol as a shell by fracturing a liquid membrane of the oxide sol; and forming the core-shell-structure spindle knot taking the oxide sol as the shell when a solvent in an oxide sol shell layer of the spindle knot is volatilized. Because of a special core-shell structure and heterogeneous core-shell components of the spindle knot, the spindle knot not only has a weak core-shell interface, but also has different thermal expansion coefficients. When the spindle knot is subjected to heating treatment, a core-shell material with different thermal expansion coefficients generates a heat stress. Under the action of the heat stress, the weak interface of the spindle knot cracks, and then the regular micro-spring is formed on the shell layer.

The invention provides an ultrasonic-assisted cavitation abrasive grain flow finishing method for titanium alloy surface oxide layers. The method comprises the following steps: stirring a solid-liquidtwo-phase mixed fluid to form high-speed turbulence vortex; extracting the solid-liquid two-phase mixed fluid, mixing the solid-liquid two-phase mixed fluid with micro-nano bubbles to form a high-speed and high-pressure gas-liquid-solid three-phase abrasive grain flow; spraying the high-speed and high-pressure gas-liquid-solid three-phase abrasive grain flow to a workpiece in a tank body for staged surface treatment; meanwhile, emitting ultrasonic waves by an ultrasonic device configured below the workpiece to form an ultrasonic cavitation effect, and forming a negative fluctuation environment with positive and negative pressure alternating rapidly in the high-speed fluid in the tank body to cause expansion and compression of micro-nano bubbles in the high-speed fluid. Under the comprehensive action of turbulence, jet, cavitaiton and ultrasonic waves, a manner of combining cavitation abrasive grain jet and turbulence integrated surrounding type processing and ultrasonic enhancement isadopted, synchronous stripping of different in-situ defects of oxide scale and derivative and chain stripping of new defect points can be realized, the removal efficiency is high, and the processinguniformity is good.

The invention discloses a molecular marker for identifying sex of haliotis discus hannai and a primer thereof. According to the molecular marker, when SNP of 522 bp, 528 bp and 532 bp of SEQ ID NO: 1 are homozygous, the genetic sex is female; and when SNP of 522 bp, 528 bp and 532 bp of SEQ ID NO: 1 are heterozygous, the genetic sex is male. The genetic sex molecular marker has advantages of being applicable to the whole life history, wider in applicable material range and the like.

The invention discloses a materials bit detecting method which comprises: (1) fixing a vibration signal generator and a vibration signal accepter on the materials bit cask, wherein the vibration signal generator and the vibration signal accepter is fixed on the lower part of the materials bit, while the other one is fixed on the upper part of the materials bit; (2) sending vibration signal by vibration signal generator; (3) accepting the vibration signal by vibration signal accepter; (4) ascertaining the materials bit by the degeneration between the sending position and the accepting position of the vibration signal.

The invention discloses single-component high-temperature glue and a preparation method thereof. The single-component high-temperature glue is prepared from the following raw materials in percentage by weight: 0 to 40 percent of modified maleic imide resin, 20 to 60 percent of liquid epoxy resin, 5 to 15 percent of latent curing agent, 1 to 10 percent of accelerant, 0 to 10 percent of active diluting agent, 15 to 40 percent of pigment and filler and 0 to 5 percent of auxiliary agent. The product is composed of a single component and has a good adhering effect on metal materials including an aluminum alloy, stainless steel, casting iron, a nickel-plated layer and the like after being heated and cured; an adhered part can work for a long period under the working condition of 300 DEG C and the service life can reach 1000h or more; meanwhile, the product disclosed by the invention also has the characteristic of rapid curing speed.

The invention relates to a method for manufacturing a conductive pattern by selectively activating an insulating material through combination of laser and chemistry, and the method comprises the following steps: finding out upper and lower limits of chemical and laser processing intensity, and determining processing parameters within the limits; acquiring the corresponding relation between the beam waist diameter of the focused light beam and the size of the circuit pattern through actual measurement, taking the beam waist diameter of the light beam as a variable, taking energy and power on the unit area as constant quantities, and generating laser machining parameters and machining data for the machining task; changing laser parameters on line, carrying out the laser processing and chemical treatment, and changing the surface performance and morphology of the material. According to the method, the effects of chemical action and laser action are controlled and accumulated, and only the area which is subjected to chemical treatment and laser processing at the same time has the activity needed by chemical plating and the surface state needed by electroplating. The quality is reliable and the speed is fast; the method is environment-friendly, clear in process route, specific in parameters and indexes and controllable in process. The method is suitable for manufacturing circuits on planar and three-dimensional plastic, ceramic and glass entities.

The invention discloses a method for improving the interface connection strength of a dissimilar resin or dissimilar resin-based composite material welding joint, relates to the field of welding, and aims to improve mechanical interlocking connection in the dissimilar resin or dissimilar resin-based composite material welding joint, reduce melting and outflow of low-melting-point resin and achieve the effect of improving the quality of the joint. According to the method, a welding material and a heating element are selected, two kinds of welded resin or resin of two kinds of welded resin-based composite materials are used for manufacturing a composite film layer, a test piece is clamped, and welding is carried out. According to the method, a mechanical interlocking structure can be constructed on the joint interface, diffusion bonding of the joint interface of resin difficult to be compatible is improved, excessive melting and flowing out of low-melting-point resin or low-melting-point resin matrix resin in a resin-based composite material in the welding process are inhibited, joint forming and performance are improved, and the method has good practical application prospects. The method is applied to the field of dissimilar resin welding.