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1733 results about "Gas protection" patented technology

Gas protection is a technical solution to prevent or to control gas penetration into properties. The control of gas migration is normally achieved by blocking the pathway or removing the source of the gas generation. There are several methods available to achieve the protection of existing/new build properties and also another factor is the use of the property and size (economic factors).

Marine engineering large thick steel plate submerged arc welding process method in low-temperature environment

The invention belongs to the field of welding, in particular to a process method applicable to marine engineering large thick steel plate submerged arc welding in low-temperature environment, which comprises a welding method, welding material selection, a welding order, a welding process and the selection and control of various welding process parameters. The method renders with carbon dioxide gas protection welding, and fills and faces through an automatic submerged arc welding; stops welding when the welding reaches more than two thirds of the thickness of a large groove during the welding process, clears chips on the back side and completes the welding of the other side; finally completes the welding of the first side; strictly controls all relevant process parameters of the welding during the welding process, and solves the problems of poorer anti-crack toughness of welding seams and heat affected zones caused by too high cooling speed of the welding seams and too high temperature; can ensure good anti-crack toughness of a welding seam connector without heat treatment after welding; and can meet the requirements of welding of an E36 plate with the thickness of 35 to 77mm under the working environment at the temperature of above -30DEG C, simplifies the production process, shortens the production cycle and reduces the cost.
Owner:PENGLAI JUTAL OFFSHORE ENG HEAVY IND CO LTD

Method for preparing bimetal composite plate by stirring friction braze welding

The invention discloses a method for preparing a bimetal composite plate by stirring friction braze welding. The method comprises that: a plate with small hardness is used as a covering layer metal plate; a plate with high hardness is used as a base layer metal plate; the covering layer metal plate and the base layer metal plate are horizontally fixed on a working platform surface in a lap joint mode; solders which can generate eutectic reaction with one of the upper/base layer metal plates are preset between the upper/base layer metal plates; a non-needle type cylinder friction device is arranged over the covering layer metal plate; the non-needle type cylindrical friction device is made to rotate and be pressed to be closely contacted with the surface layer of the covering layer metal plate, but not penetrate the covering layer metal plate, and the non-needle type cylindrical friction device rotates in the original position or moves forward along the surface of the covering layer metal plate while rotating; by utilizing frictional heat to melt the solders, the upper/base layer metal plates are both quickly melted in the solders, thereby achieving excellent interface combination; and the excessive solders are squeezed out, and a thin and dense soldering seam is formed, so that the bimetal composite plate is prepared. Compared with the braze welding in a furnace, the method has the advantages of high efficiency, energy conservation, pressure lead-in, unnecessary soldering flux and gas protection and short holding time at a high temperature.
Owner:XI AN JIAOTONG UNIV

Method for preparing graphene-coated carbon microsphere material by coating graphene oxide on carbon microsphere

InactiveCN102544459AWide range of optional preparation equipmentCell electrodesSucroseHazardous substance
The invention relates to a method for preparing a graphene-coated carbon microsphere material by coating graphene oxide on a carbon microsphere. The method comprises the following steps of: preparing a graphene oxide dispersion solution; preparing the carbon microsphere through taking glucose, sucrose and starch as a carbon source by using a hydrothermal method under acidic conditions; adding the dried carbon microsphere into the graphene oxide dispersion solution; filtering and drying to obtain a graphene-oxide-coating carbon microsphere product; and carrying out thermal reduction on the graphene-oxide-coating carbon microsphere product under a gas protective atmosphere, and naturally cooling to room temperature to obtain a graphene-coaed carbon microsphere product. Compared with the prior art, the method provided by the invention has the advantages that no harmful substances are used in a preparation process, the range of selectable preparation equipment is wide, the raw materials, i.e. graphene and the carbon microsphere, are not required for being subjected to further modification and processing, the water resources used in the preparation process can be recycled and utilized, and products with different proportions and different degrees of reduction can be prepared according to different needs, so that a precondition is provided for the diversity of materials.
Owner:上海碳源汇谷新材料科技有限公司

Method for improving compactness of 3D (three dimensional) printing metal part by adopting second laser beam

The invention discloses a method for improving the compactness of a 3D (three dimensional) printing metal part by adopting a second laser beam. The method comprises the following steps of: (a) pretreating a printing base and a printing baseplate; (b) carrying out 3D printing on the printing baseplate by using a first laser beam and alloy powder according to a preset moving trajectory by the way of lap joint step by step and superimposing layer by layer, protecting the surface of a workpiece and the flow field of the alloy powder by an inert gas in the process of printing, and melting the alloy powder by using the first laser beam to form a printing layer; (c) remelting the printing layer which is obtained by carrying out 3D printing by using the following second laser beam, wherein the second laser beam advances spirally or zigzag or telescopes back and forth according to the moving trajectory of the first laser beam; and (d) post-processing the metal part. Because the printing layer is remolten synchronously by adopting the second laser beam, the defects of holes, air pockets, thermal cracks and interface cracks generated in the process of carrying out 3D printing can be reduced, and the compactness of a metal tool can be improved.
Owner:张翀昊

Combination manufacturing method and device for injection mold with conformal cooling water path

The invention discloses a combination manufacturing method and device for an injection mold with a conformal cooling water path. The device comprises a light beam focusing system, a close wave length coaxial vision positioning system, a powder pavement system and a gas protection system. The gas protection system comprises a sealed forming chamber, a shielding gas device and a powder purification device, wherein the shielding gas device is connected to one side of the sealed forming chamber, and the powder purification device is connected to the other side of the sealed forming chamber. The method is a combination processing method combined with the laser region selection fusion technology and the precision cutting processing technology, the advantages of the laser region selection fusion flexible processing are retained, and the feature that the precision of the high-speed cutting processing is good is given to play. In the process of region selection laser fusion processing, laser surface refusion processing is carried out on each layer, and the compactness and the surface quality of the mold are improved. The technique of density changing rapid manufacturing is adopted, and manufacturing efficiency is improved. Precision mold components with the interior special-shape cooling water path and the complex inner cavity structure can be integrally processed at a time.
Owner:SOUTH CHINA UNIV OF TECH

Robot automatic welding production line of middle groove and technological method thereof

The invention relates to the technical field of production manufacturing of a cast middle groove by a heavy-duty scraper conveyor used on coal mines, and provides a robot automatic welding production line of a middle groove and a technological method thereof. The production line designs 8 stations according to the manufacturing process flow of the middle groove, comprises 6 parts of a primary assembly station, a middle plate preheating station, a backing welding station, a middle plate and bottom plate robot welding work station, a secondary assembly station and a bending rail rest robot welding work station, and forms an integrated production line layout of the middle groove. The invention integrates and uses multiple technologies of a welding robot, double-wire welding, digital double-pulse welding power source, computer control, high-efficiency flame preheating and the like, and establishes technical measures of preheating temperature, bevel form, welding sequence, welding parameters and the like; and the welding process is controlled by a computer, thereby realizing high-efficiency automatic robot welding of the middle groove in the overall process. Compared with the traditional manual gas shielded welding, the invention obviously improves the welding quality of the middle groove and increases the welding efficiency by 3-4 times.
Owner:CHINA COAL ZHANGJIAKOU COAL MINING MACHINERY

Preparation method of high-reaction-activity hydroxyl acrylic resin

The invention relates to a preparation method of high-reaction-activity hydroxyl acrylic resin. According to the invention, a solvent in a reactor is heated to a preset temperature under the protection of an inert gas; a mixture of a monomer component A with hard monomer as a main component (and comprising a small amount of soft monomer, hydroxyl monomer and carboxyl monomer) and an initiation agent is slowly added; a reaction is carried out for a certain period of time with maintained temperature; a mixture of a monomer component B with soft monomer as a main component (and comprising a small amount of hard monomer, hydroxyl monomer and carboxyl monomer) and an initiation agent is slowly added; and reaction is carried out for a certain period of time with maintained temperature, such that acrylic resin comprising hydroxyl is obtained. The invention has the characteristic that common monomers are adopted, and only the synthesis process is changed wherein monomer dropping sequence is changed, such that resin molecular structure is substantially changed, and the synthesized hydroxyl acrylic resin shows high reaction activity during a curing reaction. The method provided by the invention also has the advantages of low cost, simple process, and suitability for industrialized productions.
Owner:XI AN JIAOTONG UNIV +1

Device and method for use of impeller of laser 3D (three dimensional) -printing pump

The invention discloses a device and a method for the use of an impeller of a laser 3D (three dimensional) -printing pump, and belongs to the field of 3D printing technology. The device comprises a laser system, a gas protection system, a preheating system, a powder feeding system, a powder paving system, a powder recycle system and a computer system. The manufacturing method mainly comprises the following steps that 1, a CAD solid model of the pump impeller is drawn, and the model is subjected to hierarchical slicing along the Z direction; 2, the slice in each layer is zoned into a zone I and a zone II according to the performance requirements of the pump impeller; 3, the zone I of each slice layer is subjected to low-speed sintering by using powder A, and the zone II is subjected to low-speed sintering by using powder B. The surface of a workpiece and the powder flow filed are subjected to the inert gas shielding in the process of printing. According to the device and the method for the use of the impeller of the laser 3D-printing pump, different requirements of different positions of the pump impeller on mechanical performance can be met, the printing quality and speed are also improved, and the manufacturing cost is reduced.
Owner:江苏大学扬州(江都)新能源汽车产业研究所

Hot wire consumable electrode gas protection welding method and realization device thereof

InactiveCN101862886AFast meltingIncrease the melting speed, so that the welding deposition speedArc welding apparatusMelting tankWelding power supply
The invention relates to a hot wire consumable electrode gas protection welding method and a realization device thereof, which belong to the technical field of welding. The invention solves the problems of low welding efficiency and low welding quality in the existing consumable electrode gas protection welding method and the device for realizing the welding method caused by incapability of realizing the reasonable distribution of welding wires and hot input of fusing tanks. The welding method comprises the following steps: placing the tail end of the consumable electrode welding wire near a part to be welded of a work piece to be welded; forming a main arc between the tail end of the consumable electrode welding wire and the surface to be welded of the work piece to be welded under the effect of a constant voltage welding power supply for realizing the welding; placing the tail end of a conductive annular sleeve of a welding gun near the side wall of the consumable electrode welding wire in the welding process; and forming a preheating electric arc between the tail end of the conductive annular sleeve of the welding gun and the side wall of the consumable electrode welding wire under the effect of a constant current welding power supply for realizing the preheating on the consumable electrode welding wire. The realization device consists of the constant current power supply, the constant voltage welding power supply and the welding gun. The invention is used for the implementation of the gas protection welding.
Owner:HARBIN INST OF TECH

Active carbon for super capacitor and a preparation method thereof

The invention relates to an electrode material for an electrochemical super capacitor, more particularly to an active carbon for the super capacitor and a preparation method thereof. The inventive active carbon for the super capacitor is obtained by the steps of drying, carbonizing and activating starch that is taken as raw material. The preparation method thereof comprises the following steps of: 1) drying moisture in the starch; 2) putting the dried starch in an electric resistance furnace to be heated up to 350-550 DEG C under the protection of an inert gas, keeping constant temperature for 1-4 hours, and taking out after cooling to obtain a carbonizing material; 3) grinding and mixing the carbonizing material with potassium hydroxide saturated solution uniformly, drying the moisture and putting the mixture in the electric resistance furnace to be heated up to 750-850 DEG C under the protection of the inert gas, keeping constant temperature for 1-4 hours, and taking out the mixture after cooling to be ground, washing to a neutral state and drying to obtain the active carbon; the proportion by weight of the carbonizing material to potassium hydroxide solid is 1:4-8. The invention has extensive source of the raw materials, high specific surface area of the prepared active carbon and low production cost.
Owner:GUANGXI NORMAL UNIV

Porous silicon-based cathode for lithium battery and preparation method thereof

ActiveCN101894940AIncrease capacityGood high current discharge performanceCell electrodesCopper foilSolvent
The invention discloses a preparation method of a porous silicon-based cathode for a lithium battery and relates to a battery cathode and a preparation method thereof. In the invention, the problem that the great volume change produced in battery cathodes made of the conventional silicon-based materials during Li embedment and removal leads to destruction of the internal structure of the material and influences the circulation performance of electrode materials is solved. The porous silicon-based cathode for the lithium battery consists of a conductive current collector layer and a high-porosity active layer. The preparation method comprises: dissolving a bonder in a solvent; adding a conductive agent, a silicon active material and a pore forming agent; coating an electrode on the surface of a metal copper foil; and drying, rolling and performing heat treatment in an atmosphere of a protective gas. In the porous silicon-based cathode of the invention, gaps can buffer the volume change of silicon effectively, improve the circulation performance of the silicon-based cathode obviously and improve the contact area between the silicon material and electrolyte; and thus, the lithium ion embedding and removing speeds are improved, and the volume and high-current discharge performance of the silicon cathode can be improved.
Owner:HARBIN INST OF TECH

Welding method for high-performance weather-resistant steel which is at Q345qENH-Q420qENH level and used for bridges

The invention discloses a welding method for high-performance weather-resistant steel which is at the Q345qENH-Q420qENH level and used for bridges. Welding connectors selected according to specific chemical components, mechanical properties, welding connector corrosion-resistant indexes, applicable technological conditions and different plate thickness specifications of the high-performance weather-resistant steel which is at the Q345qENH-Q420qENH level and used for bridges are in the type of a butt joint and a T-shaped connector (including a corner connector); a welding method includes submerged automatic arc welding, solid wire argon-rich gas protection semi-automatic welding, flux-cored wire CO2 gas protection semi-automatic welding and shielded metal arc welding; and preheating temperature before welding is determined according to different plate thicknesses. The welding method comprehensively covers the connector types and the plate thickness specifications of the bridge steel structure; the technical scheme is high in practicability; the implementation effect totally meets the technological requirements of structural steel for existing bridges and relevant standards in the steel bridge manufacturing field; and the welding method can be used for welding the high-performance weather-resistant steel which is at the Q345qENH-Q420qENH level and has a great effect on prompting popularization of high-level weather-resistant bridge steel.
Owner:中铁宝桥(扬州)有限公司
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