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2914results about How to "Stress relief" patented technology

Method for preparing nano-scale pattern substrate for nitride epitaxial growth

The invention relates to the semiconductor technical field and discloses a method for manufacturing a nanometer pattern substrate used for the epitaxial growth of a nitride. The method comprises the followings steps: settling a layer of silicon dioxide or silicon nitride film on a substrate used for the epitaxial growth of the nitride; the silicon dioxide or silicon nitride film is coated with a layer of thin metal layer through vapor deposition; conducting the annealing heat treatment, and forming uniformly distributed nano-scaled metal particles; utilizing the formed nano-scaled metal particles as masks to etch the silicon dioxide or silicon nitride film so as to form a nanometer pattern structure; using the silicon dioxide or silicon nitride film with the nanometer pattern structure as a mask etching substrate to transfer the nanometer pattern structure of the substrate; and etching to remove the silicon dioxide or silicon nitride film, cleaning the substrate, and obtaining the nanometer pattern substrate. The invention can reduce the dislocation density in the epitaxial layer of the nitride, improve the crystal quality of epitaxial materials, improve the performance of devices and help to realize the scaled and large area manufacture.
Owner:UNILUMIN GRP

High-strength-and-toughness low alloy wear resistant steel and manufacturing method thereof

The invention relates to high-strength-and-toughness low alloy wear resistant steel and a manufacturing method thereof, belonging to the technical filed of metallurgy. The high-strength-and-toughness low alloy wear resistant steel comprises the following components by weight percent: 0.15-0.20% of C, 0.1-0.5% of Si, 1.2-1.6% of Mn, less than or equal to 0.015% of P, less than or equal of 0.005% S, 0.02-0.04% of Al, 0.016-0.022% of Ti, 0.16-0.20% of Cr, 0.16-0.22% of Mo, 0.001-0.0015% of B and the balance of Fe, and simultaneously the carbon equivalent Ceq (%) is less than or equal to 0.55. The manufacturing method comprises the following steps: smelting molten steel and pouring into a slab, and carrying out rough rolling after heating and heat insulation; and then carrying out complete quenching treatment, or sub-temperature quenching treatment, or carrying out the complete quenching treatment and then carrying out the sub-temperature quenching treatment, and adopting low temperature tempering to eliminate stress after the quenching. The method of the invention ensures higher hardness, simultaneously can obviously improve the impact toughness of steel plates, increase the impact resistance of the steel plates, and prolong the service life of mechanical equipment, and can obtain wear resistant steel plates with different strength and toughness grades by using the steel with same components and different quenching processing methods.
Owner:NORTHEASTERN UNIV +1

Automatic welding treatment integrated machine for flange plates of pipeline installing and connecting joints

The invention relates to an automatic welding and processing integrated machine for pipe installation and connection joint flanges, which includes a supporting base plate, a fixing device, a grinding device, a welding device, a rotating device and a post-welding processing device. The fixing device is installed in the middle of the supporting base plate Above, the grinding device is located above the fixing device, the grinding device is installed on the supporting base plate, the rotating device is located outside the fixing device, the rotating device is connected with the supporting base plate, the welding device and the post-welding processing device are installed on the rotating device, the welding device Located on the front side of the post-weld treatment unit. The present invention can solve the existing problems that the flange cannot be fixed multiple times when the flange and the steel pipe are welded, the flange is not firmly fixed, the flange needs to be manually polished before welding, and the flange is not polished before welding. Good, the welding action cannot be performed automatically, the post-weld treatment of the flange and the steel pipe is required manually, and the manual post-weld treatment is not thorough, etc.
Owner:范满香

Dual-beam laser selective melting and moulding equipment with exchangeable powder cylinder

The invention discloses dual-beam laser selective melting and moulding equipment with an exchangeable powder cylinder. The equipment comprises two optical systems, a frame, a workbench plate, a powder feeding cylinder, a powder storage cylinder, a moulding cylinder, a powder returning cylinder, a moulding cavity, and two first driving mechanisms, which are used to respectively drive the moulding cylinder and powder feeding cylinder to move up and down. The workbench plate is fixed on the frame, the moulding cavity is fixed on the upper surface of the workbench plate, and the powder returning cylinder, the moulding cylinder, the powder feeding cylinder, and powder storage cylinder are fixed on the lower surface of the workbench plate from left to right in sequence. A scraper is arranged in the moulding cavity, and a second driving mechanism is arranged on the frame. A substrate is arranged in the powder feeding cylinder, a substrate is arranged in the moulding cylinder, the lower ends of the powder feeding cylinder and the moulding cylinder are both provided with a cylinder end cover, and the substrates are connected to a first piston system. A second piston system is arranged in the powder storage cylinder. The provided equipment has a high moulding efficiency and is capable of effectively reducing the deformation and cracking of members.
Owner:XI AN JIAOTONG UNIV

Infrared energy-saving coating with anti-corrosion and anti-coking functions and preparation method thereof

The invention relates to an infrared energy-saving coating with anti-corrosion and anti-coking functions, which is prepared from a component A and a component B according to the weight ratio of 1: 1-2. The particle size of powder materials in the component A is not less than 280 meshes and the component A is prepared from the following powder materials according to the weight ratio: 40-60 parts of spinel structure infrared composite darkening agent, 10-30 parts of corundum powder and 3-10 parts of high-temperature binding agent. The component A further comprises an anti-coking agent, and the anti-coking agent is prepared from the following powder materials according to the weight ratio: 3-10 parts of graphite, 0-10 parts of boron nitride and 1-5 parts of manganese sesquioxide. The component B is of a film-forming substance and prepared from the following raw materials according to the weight ratio: 60-80 parts of water glass, 10-30 parts of silica sol and 0-20 parts of water-borne resin solution. The invention further discloses a preparation method of the coating. The coating provided by the invention has the advantages: corrosion prevention, capability of reducing coking, high temperature resistance and excellent infrared radiation performance.
Owner:KING STRONG MATERIAL ENG LTD

Preparation method for mu75 magnetic powder core of ferrosilicon aluminum

The invention belongs to the field of preparation of metallic soft magnetic materials, and particularly relates to a preparation method for a mu75 magnetic powder core of soft magnetic ferrosilicon aluminum, which includes steps of smelting, rough smashing, heat treatment, fine smashing, annealing treatment, powder grading, powder insulating, compression molding, secondary heat treatment and coating treatment and requires components, by weight, 9.10% of silicon, 5.95% of aluminum and the rest iron. The preparation is performed with the smelting temperature of 1600 DGE C, the compression molding pressure ranging from 1700MPa to 2000Mpa, magnetic powder core pressing temperature ranging from 600 DEG C to 800 DEG C, and one hour for warm keeping in a nitrogen-oxygen mixed atmosphere. The magnetic powder core mu=75+-6 at 100kHz, the magnetic conductivity mu is smaller than 1% in variation under 1000kHz, the magnetic powder core loss is accordant to Pcv (powder loss) 50kHZ/50mT<=100Mw/cm3, and the direct-current bias magnetic field is not lower than 70Oe when the magnetic conductivity is reduced to 50%. The preparation method for the mu75 magnetic powder core of soft magnetic ferrosilicon aluminum has the advantages that added binder is solid organic binder, the heat treatment after molding includes keeping warm for one hour in the nitrogen-oxygen mixed atmosphere, and the prepared magnetic powder core is free of pulverization, high in strength and stable in performance and has fine direct current bias characteristics, frequency stability and low loss.
Owner:TDG HLDG CO LTD

Stainless steel compound welding steel pipe and manufacturing method thereof

The invention discloses a stainless steel compound welding steel pipe and a manufacturing method thereof. The stainless steel compound welding steel pipe is formed by welding stainless steel compound hotly-rolled rolling plates through a welding line, wherein the welding line is formed by a stainless steel compound welding line and a carbon steel welding line. The manufacturing method comprises the following steps of: milling an edge and arranging a groove; when putting a stainless steel compound layer on the inner layer, firstly utilizing gas shield welding to weld a middle layer; then, utilizing a stainless steel welding strip to weld a stainless steel compound layer welding line in an argon arc welding manner; then, utilizing a carbon steel welding strip to weld the carbon steel welding line by a submerged-arc welding manner; when the stainless steel layer is less than 0.9 mm, directly welding a stainless steel welding line by submerged-arc welding; and when the stainless steel compound layer is located at the outer layer, firstly welding the carbon steel welding line by adopting the carbon steel welding strip and the submerged-arc welding, and adopting the stainless steel welding strip and the argon arc welding manner to weld the stainless steel compound layer welding line. According to the stainless steel compound welding steel pipe and the manufacturing method thereof, the manufactured stainless steel compound welding steel pipe has high structural strength and strong corrosion resistance; and the bonding strength of an inner pipe and an outer pipe is not less than 200 MPa.
Owner:ZHEJIANG KINGLAND & PIPELINE TECH

Fe-Si-Al magnetic core preparation method and inorganic composite insulation coating material for magnetic core

The invention discloses a Fe-Si-Al magnetic core preparation method and an inorganic composite insulation coating material for a magnetic core, belonging to the field of Fe-Si-Al magnetic material and used for solving the high eddy-current loss problem of existing magnetic cores and such problems caused by the fact that the existing magnetic cores usually use organic coating materials as stress is difficult to eliminate in a forming process, the insulation property of the material is poor, and the volatilization quantity of organics is large in heating processes such as heat treatment. The Fe-Si-Al magnetic core preparation method disclosed by the invention comprises the following steps: cast ingot smelting, powder making, surface phosphorization, insulation coating, compression moulding, annealing treatment and surface coating; the prepared Fe-Si-Al magnetic core has the advantages of low eddy-current loss, small magnetic conductivity temperature coefficient, good temperature stability, high direct current superposition characteristic, high saturation flux density and good high-frequency characteristic and meets the requirements for high frequency, small size, high power and electromagnetic interference resistance of electronic devices.
Owner:临沂银凤新材料技术服务有限公司

Green-removing and yellow-removing fluffer for bamboo

The invention relates to a green-removing and yellow-removing fluffer for bamboo. The device is provided with a pedestal, a main motor arranged on the pedestal, a main speed reducer and a case body. The improvement is that: the case body is also provided with two friction roller shaft systems, two fluffer shaft systems and a transmission gear shaft; each fluffer shaft system is formed by combining a shaft of which the two ends are provided with locking screw rods, a bearing and a plurality of deformed laminated untwining rotary blades fixed on the shaft by keys; each friction roller shaft system is formed by combining a roller shaft of which the two ends are provided with locking screw rods, the bearing, a gear and a textured friction roller body fixed on the roller shaft by a key; and an output shaft of the main motor is connected with the transmission gear shaft through a chain transmission device. The device can effectively remove wax green and yellow membrane and untwine bamboo fiber. The bamboo is processed into a meshed bamboo chip curtain which is not broken in the longitudinal direction and is transversely loose and connected in a staggered way, so the arrangement direction of bamboo fiber is kept. The bamboo curtain can produce restructured bamboo through an ordinary plate-making process, so the utilization rate of the bamboo reaches over 90 percent.
Owner:廊坊市双安结构胶合板研究所
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