200results about How to "Improve isotropic performance" patented technology

The invention discloses a carbon composite high-performance thermal-conductive plastic and a preparation method thereof; the thermal-conductive insulating plastic is prepared from a resin basic material, a carbon composite material, a thermal-conductive agent, a coupling agent, an antioxidant and other processing agents; by means of the special crystalline structure of the carbon composite material added in the formula of the thermal-conductive insulating plastic disclosed by the invention, the inter-particle bridging effect is realized; a thermal-conductive passage composed of the thermal-conductive agent is more and more perfect; therefore, the thermal conductivity of the composite material can be rapidly increased; a filling material gathering and thermal-conductive passage is more and more perfect; simultaneously, with the help of the processes, such as a pre-mixing process, an extrusion process, a cooling process, an air drying process and a granulating process, the problems of being degraded in high filling property and low in thermal-conductive property of the plastic are solved; the thermal-conductive composite material having excellent mechanical property and good thermal-conductive effect and insulating property can be prepared; and the thermal-conductive composite material can be widely applied in the fields, such as electrons, automobiles and LED (Light Emitting Diode) lamps.

The invention discloses a modified bamboo fiber/polymer composite high-toughness concrete and a preparation method thereof. In the method, bamboo fibers are modified successively through a coupling agent and a maleic anhydride grafted terpolymer and are added to an epoxy resin toughening emulsion. With water, the epoxy resin toughening emulsion containing the modified bamboo fibers, a polyurethane toughening emulsion, cement, coal ash, slag powder, a fine aggregate, crushed stone and a water reducing agent are employed as raw materials, the modified bamboo fiber/polymer composite high-toughness concrete are prepared through a stirring and mixing process. A test proves that the high-toughness concrete has a significant strain hardening characteristic or a significant deformation hardening characteristic under an effect of a direct stretch load of a direct bending load. The high-toughness concrete has a bending strength being 17-26 MPa, a compressive strength being 75-92 MPa and a tensile strength being 6-15 MPa. The high-toughness concrete can be applied in fields such as a bridge floor of a long-span cross-sea or cross-river bridge, the bridge floor of a viaduct of a high-speed railway, and various tunnel arch walls, in a subway and the like, and the like.

A laser machining system for roughening the surface of roller in such manner that the roughened dots are irregularly deflected is composed of a machine-tool for driving the roller to be machined to rotate, a laser machining unit moving axially along said roller, and a pseudo-random deflecting mechanism consisting of pseudo-random signal generator, the driver of the motor for making lens to vibrate, and the lens vibrating assemblage comprising lens vibrating motor and reflector. Its method is also disclosed.

The invention discloses a six-free-degree 3-3 orthogonal type parallel robot which comprises a motion platform, a fixed framework and a mechanical branch chain set, wherein the mechanical branch chain set is arranged between the motion platform and the fixed framework and connected with the motion platform and the fixed framework, the mechanical branch chain set comprises six mechanical branch chains in 3-3 orthogonal arrangement. The 3-3 orthogonal arrangement refers to that the six mechanical branch chains are divided into two sets, and each set comprises three mechanical branch chains. The axes in the three driver directions of the three mechanical branch chains in the first set are positioned in the same plane surface, and each two axes form a 120-degree angle but do not cross at one point; the axes in the three driver directions of the three mechanical branch chains in the other set are parallel to one another, but do not in the same surface, and the axes are in pairwise orthogonal with the axes in the direction of the three mechanical branch chains in the first set. The six-free-degree 3-3 orthogonal type parallel robot provided by the invention has the advantages of high system rigidity, high positioning accuracy, excellent dynamic response property, excellent isotropy of mechanical properties such as rigidity, bearing and the like, small occupied space, low energy consumption, long service life, low manufacturing cost, less maintenance cost, zero contamination and the like.

The invention provides a three-degree-of-freedom parallel serial joint plastic operation robot. The problems of uneven operation level of doctors and low overall precision in the present prosthesis joint replacement are solved. The three-degree-of-freedom parallel serial joint plastic operation robot comprises a workbench, wherein a vertical mechanism and horizontal mechanisms are arranged on the workbench; an abrasive drilling mechanism is arranged on each of the horizontal mechanisms; the quantity of the horizontal mechanisms is two; the horizontal mechanisms are respectively arranged on the two sides of the vertical mechanism; the vertical mechanism comprises a vertical sliding table and a vertical driving component; each of the horizontal mechanisms comprises a horizontal sliding table and a horizontal driving component; connecting arms are fixedly connected with the two sides of the vertical sliding table; an outer end of each connecting arm is hinged to the horizontal sliding table on the corresponding side; a claw arm forward extends from each of the horizontal mechanisms; a sleeve ring is arranged at the front end of each claw arm; the sleeve rings forward extending from the horizontal mechanisms on the two sides are vertically overlapped and formed into a communicated sleeve hole; the abrasive drilling mechanism is penetrated through the sleeve hole; an inner wall of the sleeve hole is in sliding contact with an outer wall of the abrasive drilling mechanism. According to the invention, a triangular structure is adopted by the robot, so that the accurate route of a three-dimensional space track is realized and the face cutting precision of a bone joint is increased.

A nine-rope driving robot device for simulating zero gravity and low gravity comprises a foundation framework, ropes, a rope driving unit, a rope guiding device, a simulation load platform, a sensor and a control system. According to the nine-rope driving robot device for simulating the zero gravity and the low gravity, a nine-rope redundant driving scheme is adopted, the nine ropes are distributed in a mode with six ropes being arranged at the top and three ropes being arranged at the bottom; extension and shortening of the ropes are achieved through a driving unit which is driven by a motor according to a command of the control system; the control system achieve closed-loop or semi-closed-loop control on the length and force of every rope according to the force and pose position data from the sensor; meanwhile the upper six ropes can be adopted to control and simulate the pose position and movement of a load platform, the lower three ropes perform force tensioning or compensation control, and accordingly the nine-rope driving robot device for simulating the zero gravity and the low gravity has the capability of stimulating six degrees of freedom under the zero gravity or low gravity environment in large working space and meanwhile can apply the distributing force in a superposition mode through the lower three ropes or mote ropes. The nine-rope driving robot device for simulating the zero gravity and the low gravity is good in isotropy performance and has an application potential in other fields such as rehabilitation equipment.

The invention relates to the technical field of lithium ion battery carbon cathode materials and in particular to a modified microcrystal graphite cathode material of a lithium ion battery as well asa preparation method and application thereof. The material has the advantages that (1) a modified core-shell structured natural graphite cathode material with artificial graphite embedded into and onthe surface of natural graphite in situ is prepared, the overall structural properties of natural microcrystal graphite are maintained, pores of the natural microcrystal graphite is filled with the artificial graphite, and the outer surface of the natural microcrystal graphite is wrapped by the artificial graphite; (2) compared with a conventional cathode material, the cathode material prepared byusing the method provided by the invention is good in isotropy, is capable of inhibiting and absorbing expansion of electrodes in the charge and discharge process, is high in primary coulombic efficiency, long in service life and good in high-magnification charge and discharge performance and is capable of replacing artificial graphite to manufacture cathode materials of power batteries, so as tolower the cost greatly; and (3) the method is simple in preparation process, low in cost and relatively high in practicability.

A cold-rolled sheet is provided. The cold-rolled sheet includes a steel substrate with a carbon content C₀ between 0.07% and 0.5%, expressed by weight, and a metal pre-coating on at least the two principal faces of the steel substrate. The substrate has a decarburized area on the surface of each of the two principal faces. The depth p_50% of the decarburized area is between 6 and 30 micrometers, and p_50% is the depth at which the carbon content is equal to 50% of the content C₀. The sheet does not contain a layer of iron oxide between the substrate and the metal pre-coating.

The invention provides a production method of heavy-gauge large-single-weight low-alloy high-strength structural steel plates. The method comprises the steps of smelting, casting, electroslag remelting, electroslag ingot cleaning, heating, rolling, water cooling, hydrogen diffusion treatment, supersonic wave flaw detection, normalization, examination and warehousing. The largest thickness of the steel plates produced through the method of the invention can reach 410mm. The method allows the isotropy, the impact toughness and the Z-directional performances of the heavy-gauge steel plates to be realized through adopting large slab electroslag remelting treatment and a reasonable controlled rolling and heat treatment technology, the production cost to be reduced, the time of delivery to be substantially shortened and the specification range to be wide, and is used for satisfying continuously increased market application amount demands; and the steel plates can completely substitute import products to satisfy various requirements of heavy-gauge large-single-weight steel plates applied to water power, wind power and large building structures.

A laser system for generating the roughened dots with irregular circumference on the surface of a roller is composed of a machine-tool system, a laser processing system and a pseudo-random delay unit for randomly delaying the laser output signals. Its method features that the laser output signals emitted to the surface of roller are randomly delayed in a defined time range.

The invention discloses a novel inorganic thermal protection structure and a manufacturing method thereof. The novel inorganic thermal protection structure comprises an aluminum alloy basal body, a heat insulation layer and a heat-protection layer, wherein the heat insulation layer is a space reticular structure with a plurality of staggered hole gaps, the staggered hole gaps comprise a hollow sleeve pipe braided by a plurality of layers of quartz fibre wound on the aluminum alloy basal body, and the heat-protection layer is a model body which is formed by pressing a silicon nitride powder body and is matched with the heat insulation layer. The internal diameter of the quartz fibre sleeve pipe is 0.5-1.0 mm. The quartz fibre sleeve pipe is wound by a wet method, and the distance of the sleeve pipe is 1-4 mm; the quartz fibre sleeve pipe comprises the following parameters from the inside to the outside: the internal ring direction winding layer thickness H 1 is 1-4 mm, the spiral winding layer thickness H2 is 20-35 mm, and the external ring direction winding layer thickness H3 is 5-20 mm; the winding parameter of the spiral winding layer thickness is 75-85 degrees, and the winding direction between layers is formed by opposite superposition. The thickness of the silicon nitride heat-protection layer is 2-4 mm.

The invention discloses a solvent hot-liquid phase transforming method to synthesize superhard micro-nanometer material in the chemical and new material domain, which comprises the following steps: dispersing hexagonal boron nitride, graphite mold carbon nitride or graphite powder solid particle in the liquid dielectric organic solvent, proceeding ultrasonic dispersing disposal for suspension liquid, adding fitful addictive to reduce phase-transforming needed temperature and pressure, changing boundary energy condition between solid particle and liquid dielectric, accelerating the solid particle to change to needed material.

A preparation method of a large-size and fine-grain molybdenum tantalum alloy sputtering target material comprises steps of cold isostatic pressing molding through combination of a steel mold with a rubber plate, sintering, levelling and reshaping, hot isostatic pressing treatment, rolling and machining. The grain size of the produced target material is smaller than 50 microns, the change of the grain size is maintained within 20%, and grains are evenly distributed in the plane direction and the thickness direction of the target material; the relative density of the target material is higher than 97%; besides, the large-size sputtering target material with the length being about 2 m and the width being about 1.3 m can be produced.

The invention relates to a production method of a high-density long-life tungsten-molybdenum alloy crucible. The production method comprises the steps of preparing tungsten-molybdenum mixed powder, preparing powder blanks, lathing and machining the powder blanks, sintering, performing surface treatment, and then performing hot isostatic pressing. According to the production method, cold isostatic pressing, sintering treatment and the hot isostatic pressing are combined to treat the tungsten-molybdenum powder, so that the dislocation density in a product is high, and dislocations mutually intersect so as to form jogs, so that the intensity of the product is increased. Additionally, fibrous tissues of the blanks formed by the cold isostatic pressing are disconnected again and recrystallized by hot isostatic pressing molding, so that the conditions of tissue delamination, uneven grain distribution and uneven grain size are avoided, the obtained tissues are uniform, small and dense, and the service life is prolonged.

The invention discloses a preparation method of a high-performance graphite negative electrode material for a lithium ion battery. The method comprises the following steps of 1) collecting petroleum coke micropowder in a shaper and a grinder in normal graphite production, and mixing the petroleum coke micropowder, ground expanded graphite powder, raw mesocarbon microbeads and an adhesive in a mixer for 0.5-3 hours according to a mass ratio of 1 to (0.01-0.3) to (0.7-1.5) to (0.1-0.2) to form a solid-phase coated mixture, wherein the frequency of the mixer is 30-50HZ; and 2) graphitizing the solid-phase coated mixture obtained in the step 1) to obtain the high-performance graphite negative electrode material for the lithium ion battery. The method is simple and feasible; micropowder wastes in a dust collector are recycled, so that the cost is reduced; the method is easy for large-scale industrial production; and the obtained graphite negative electrode material has the characteristics of high energy density, good liquid absorption and retention performance, good cycle performance, good isotropic performance, good high-rate charge/discharge performance and low expansion rate in a charge/discharge process.

The invention discloses a preparation method of a C/C composite tube of an optical telescope. The method comprises the following steps: 1) carbon fiber fabrics and carbon fiber felts are spread layer by layer, needle-punching is performed on each layer to prepare a preformed reinforcement body, the density of the preformed reinforcement body is estimated before layer spreading and the radial density of the preformed reinforcement body is calculated according to the estimation result; 2) composite densifying is performed; 3) high temperature treatment is performed; and 4) the subsequent treatment is performed. The densifying process comprises the following steps: 201) performing gas-phase carbon-settling densifying treatment, namely using a gas-phase carbon-settling device to perform gas-phase carbon-settling treatment; and 202) performing resin impregnation, curing and carbonization treatment, namely performing further densifying treatment on the preformed reinforcement body after thegas-phase carbon-settling densifying treatment. The method has reasonable design, simple processing steps, low input cost, simpleness in operation and convenience in quality control; and the processed C/C composite tube has good performance, higher overall strength and stability and an ultralow thermal expansion coefficient.

The invention discloses a method for producing a large-thickness lamination-crack-resistant tempered high-strength steel plate. The method is characterized by comprising the steps: smelting, performing continuous casting, performing electroslag remelting, heating, rolling, annealing and performing heat treatment. The steel plate comprises the following chemical components in percentage by weight: 0.14-0.18 percent of C, 0.20-0.50 percent of Si, 0.95-1.25 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.80-1.15 percent of Ni, 0.40-0.60 percent of Cr, 0.40-0.60 percent of Mo, 0.020-0.050 percent of Nb, 0.010-0.030 percent of Ti, 0.020-0.045 percent of TAl, and the balance of Fe and inevitable impurities. According to the method, electroslag remelting treatment is adopted, good overall performance of the large-thickness steel plate with the diameter of 30mm can be met due to the reasonable controlled rolling and heat treatment process, and the production cost is reduced; and the specification range is wide. The method adopts the steps of electric furnace smelting, continuous casting and electroslag remelting smelting, the contents of P and S in the obtained tempered high-strength steel plate are low, and the steel is pure; and moreover, a large-slab electroslag remelting technology is adopted, the round ingot hammer cogging process during electroslag remelting is reduced, the production period is shortened, and the cost is obviously reduced.

The invention discloses an eight-degree-of-freedom series-parallel combined automatic welding robot, which consists of two parts of a six-degree-of-freedom parallel robot and a double-degree-of-freedom direction regulation mechanism which are connected in series through a movable platform to form the eight-degree-of-freedom series-parallel combined robot, wherein the six-degree-of-freedom parallel robot comprises a base, the movable platform and a mechanical leg which is arranged between the base and the movable platform, and the two ends of the mechanical leg are respectively hinged with the base and the movable platform; the double-degree-of-freedom direction regulation mechanism is installed on a mechanism static platform, the mechanism static platform is designed in consistence with the movable platform and is connected with the movable platform in series, the double-degree-of-freedom direction regulation mechanism is driven with a linear drive mode, a connection plate is arranged on the mechanism static platform, two direction drive motors are installed on a box body of the mechanism static platform on the connection plate, and are connected with a connection part of a welding output mechanism in a linear drive transmission way. The eight-degree-of-freedom series-parallel combined automatic welding robot has higher bearing capacity and control precision, the movement space of the parallel robot is prevented from being limited, and the welding performance with higher quality is further improved.

The invention discloses an anti-impact flexible protective composite material based on a shear thickening adhesive, and a preparation method of the composite material comprises the following steps of:(1) preparing the shear thickening adhesive; (2) preparing a shear thickening adhesive diluent and a fixed shape shear thickening adhesive; (3) preparing a shear thickening adhesive composite flexible protective fabric; and (4) placing the fixed shape shear thickening adhesive obtained in the step (2) into an interlayer of two layers of the shear thickening adhesive composite flexible protectivefabric obtained in the step (3) or interlayers of multiple layers of the shear thickening adhesive composite flexible protective fabric obtained in the step (3), and sewing and fixing the periphery ofthe interlayers to obtain the flexible protective composite material. The anti-impact flexible protective composite material not only maintains good flexibility but also has excellent antistatic property and impact resistance.

The invention relates to a chemical imidization preparation method of nano rectorite/polyimide film. A binary surface modifying agent is adopted for organic modifying on rectorite, and the prepared organic rectorite has wider interlamination region and better dissociation effect and is easier to form polyimide/nano rectorite intercalation compound; in-situ polymerization is adopted for adding the organic rectorite, so as to cause the organic rectorite to be more evenly dispersed in polyimide acid; and chemical imidization is used for preparing polyimide nano composite material, so that film forming performance thereof is better. The nano rectorite/polyimide compound film prepared by the invention is improved in thermal stability and size stability with low thermal expansion coefficient.

The invention belongs to the field of cement mortar preparing, and particularly relates to high-tenacity crack-resistant grouting cement mortar and a preparing method thereof. The mortar comprises 80-100 parts of cement, 120-180 parts of 50-200-mesh silver sand, 20-50 parts of water, 5-10 parts of polyurethane solutions, 5-10 parts of epoxy resin emulsion, 10-15 parts of toughening composite materials, 1.5-6 parts of early strength agent, 2-9 parts of methacrylic acid, 2-6 parts of calcium formate, 2-8 parts of neopentyl glycol, 0.2-0.8 part of sodium dodecyl benzene sulfonate and 0.9-2.4 parts of water reducing agent. As toughening composite materials are added into the cement mortar, whole concrete has good tenacity, good isotropy and good fatigue resistance, the crack resistance of the grouting mortar is better facilitated, tenacity is improved, and the later-period maintenance cost of engineering is reduced.