3637results about How to "Reduce residual stress" patented technology

A microbolometer infrared sensor utilizes a porous silicon bridge as its thermal isolating and mechanical supporting structure. Porous silicon formed from single crystal silicon on lightly doped p-type silicon has a thermal conductivity lower than silicon dioxide and silicon nitride, and, therefore, when used as a mechanical supporting structure, can offer better thermal isolation performance. The porous silicon layer can be fabricated much thicker than silicon dioxide and silicon nitride membranes since there is almost no residual stress therein. A thicker porous silicon bridge has higher mechanical support strength. The porous silicon process is a low temperature process. It facilitates a fabrication strategy of microelectronics first and micromechanics last.

A chip-type sensor against ESD and stress damages and contamination interference includes a substrate structure and a protection layer covering over the substrate structure. The protection layer includes, from bottom to top, a first layer for providing a first stress against the substrate structure, a second layer for providing a second stress against the substrate structure, and a third layer for providing a third stress against the substrate structure. The first stress and the third stress belong to one of a tensile stress and a compressive stress, and the second stress belongs to the other of the tensile stress and the compressive stress.

Coating-film furnished coated tools that are lubricative while maintaining resistance to wear are realized by coated tools in which a plurality of coating films is furnished on a base part. Furnished as the coating are one or more layers of, respectively: a first film composed of one compound selected from nitrides, carbides, carbonitrides, oxynitrides and carboxynitrides of TiSi; and a second film composed of one compound selected from nitrides, carbides, carbonitrides, oxynitrides and carboxynitrides of one metal M selected from Ti, Cr, and TiCr. The first film and the second film are laminated in alternation.

The invention relates to an aluminum alloy product suitable for structure and function integration, and a preparation method thereof. The aluminum alloy product comprises the components of, by weight, 5.5-10.0% of Zn, 1.5-2.8% of Mg, 1.5-2.5% of Cu, 0.01-0.50% of Cr, 0.05-0.50% of Mn, 0.01-0.20% of Zr, and balance of of Al and incidental elements and impurities. In the aluminum alloy product: (a) Zn+Mg+Cu is no lower than 10.0% and no higher than 14.0%; (b) (Zn / Mg)+Cu is no lower than 4.4 and no higher than 6.5; (c) Cr+Mn+Zr is no lower than 0.10 and no higher than 0.60; and (d) the content of Cr is no higher than that of Mn, and content of Mn is no higher than that of Cr+0.20. The aluminum alloy product has high strength, high electric conductivity, and good thermal conductivity. Also, the aluminum alloy product has low residual stress, good surface quality, and good dimensional precision. The invention also relates to a preparation method of the aluminum alloy product.

An abrasive tool insert includes (a) a substrate having a support face that includes (1) an inner support table, (2) an outer shoulder having a width, Sw, and (3) a downwardly sloping interface from the support table to the shoulder, which interface has a slope angle, Sa. A continuous abrasive layer, integrally formed on the substrate support face, includes (1) a center having a height, Dc, (2) a diameter, Dd, (3) a periphery having a height, Dp, in contact with the shoulder and which periphery forms a cutting edge. Sw:Dd ranges from between 0 and about 0.5. For each Sa and Sw:Dd, Dc:Dp is selected so as to diminish residual stress in the abrasive layer.

The invention relates to an anti-bending multimode fiber and manufacturing method thereof. The fiber comprises a core and a cladding and is characterized in that the radius of core R1 is 24-26 microns, refractive index section of the core is like a parabola, refractivity maximum delta1 is 0.9-1.1%, the cladding outside the core is composed of three parts, the radius of inner cladding R2 is 1.04-1.6 times of the radius of core R1, delta2 is minus 0.01-0.01%, intermediate cladding is gradually changed in refractive index, the radius of intermediate cladding R3 is 1.06-1.8 times of R1, refractivity is gradually changed into delta4 from delta2, the radius of outer cladding R4 is 2.38-2.63 times of R1, and delta4 is minus 0.20% to minus 0.40%. The invention reduces fiber bending additional attenuation and improves anti-bending performance of fiber but also basically eliminates inner stress of fiber, greatly improves mechanical properties of fiber, and service life of fiber operating in minor radius for a long time also can be guaranteed. The manufacturing method of the invention is simple, convenient and effective and is applicable to mass production.

A rare-earth-containing ultrahigh strength collapse-resistant petroleum casing and a production method thereof belong to the technical fields of ferrous metal smelting and metal press working. The petroleum casing comprises the following raw materials by weight percent: 90% of blast furnace molten iron and 10% of high quality steel scrap. The casing blank comprises the following chemical components by weight percent: 0.18-0.35% of C, 0.10-0.35% of Si, 0.55-1.10% of Mn, less than or equal to 0.025% of P, less than or equal to 0.020% of S, 0.60-1.10% of Cr, 0.15-0.50% of Mo, 0.01-0.03% of Al, 0.0005-0.0100% of RE ( RE is the mixed rare earth metals of Ce and La and the weight percents of Ce and La are 67% and 33% respectively), less than 0.10% of Cu, less than 0.10% of Ni and the balance of Fe and trace elements. The process flow of the production method is as follows: pretreating molten iron, smelting in a top-bottom blowing converter, refining in a ladle furnace (LF), performing VD vacuum treatment, performing continuous casting of round billets, performing flame cutting, heating the casing blanks, boring, performing continuous rolling, performing sizing and diameter reducing, cooling, performing saw cutting, performing heat treatment, straightening, performing flaw inspection and lathing screw threads. The mechanical properties of the petroleum casing are as follows: the strength is no less than 140000PSI, the residual stress is no more than 80MPa, the impact power is no less than 80J and the grain size is no less than the grade 8. The product is characterized in that the residual stress is low, the content of harmful elements is low, the impact toughness is high, the grains are small, and the product resists extrusion and is difficult to damage.

An expandable biodegradable polymeric stent is fabricated with biodegradable polymer fibers (Poly-L-lactic acid, PLLA) in a coil shape that is constructed with both central and external or internal peripheral lobes. It is delivered and expanded using a conventional angioplasty balloon system. The disclosed stent can serve as a temporary scaffold for coronary vessels after PTCA or for peripheral endovascular stenting, or it can provide mechanical palliation for strictures of ductile organs (trachea, esophagus, bile and pancreatic ducts, ureter etc.). The disclosed stent also serves as a unique device for specific local drug delivery. Therapeutic agents (chemical compounds, protein enzyme and DNA sequences) and cells can be loaded into the stent and gradually released to target tissues. Local radiation therapy can also be delivered by a specially adapted stent.

The invention relates to a self-lubricant composite soft coat blade, and relative production. Wherein, said blade uses the MoS2 / Zr / Ti composite coat blade made from middle-frequency magnetic-control multi-arc plating method; the surface of blade is MoS2 layer, between which can base there are Ti, MoS2 / Zr / Ti, and MoS2 / Zr transition layer; when using said blade to cut, the surface of blade can form continuous lubricant layer, to realize self-lubricant function; since the solid lubricant has low shearing strength, the solid lubricant layer will be transferred to the surface of work piece, to form transfer film and the friction in the cutting process will generate inside the solid lubricant layer, to reduce friction, reduce shearing force and reduce shearing temperature.

The invention relates to a field welding repair method especially for larger and penetrating defects in a steel casting with heavy wall thickness. The method comprises a pre-welding preparation process, a welding repair process and a post-welding quality inspection process, wherein the welding repair process comprises the steps of (1) preheating; (2) carrying out 1 to 2 layers of backing weld for all positions of a groove by adopting TIG weld, and filling the whole bottom of the groove with solid wire materials; (3) warming up to 220 to 330 DEG C, carrying out constant thermal insulation for 3 to 8 hours, adopting manual arc welding to implement the filler welding for the groove, hammering the welded bead immediately with an air hammer, and ensuring the dense and uniform traces of the hammer; (4) carrying out dehydrogenation heat treatment; (5) carrying out post-welding treatment: carrying out stress annealing at the temperature of 500 to 550 DEG C, then carrying out high tempering at the temperature of 700 to 750 DEG C, and finally, cooling at the speed of 65 to 150 DEG C / h to the room temperature. After welding repair, a welding seam is tested to be good in quality, and have low possibility of cracking again.

Polycrystalline diamond constructions comprises a diamond body attached to a metallic substrate, and having an engineered metal content. The body comprises bonded together diamond crystals with a metal material disposed interstitially between the crystals. A body working surface has metal content of 2 to 8 percent that increases moving away therefrom. A transition region between the body and substrate includes metal rich and metal depleted regions having controlled metal content that provides improved thermal expansion matching / reduced residual stress. A point in the body adjacent the metal rich zone has a metal content that is at least about 3 percent by weight greater than that at a body / substrate interface. The metal depleted zone metal content increases gradually moving from the body, and has a thickness greater than 1.25 mm. Metal depleted zone metal content changes less about 4 percent per millimeter moving along the substrate.

The invention provides a production method of a large caliber high steel-grade corrosion-resistant seamless steel tube with the diameter of phi 219.0-phi460.0mm, which comprises the steps of the techniques of: steel making, tube rolling, thermal treatment and processing of the steel tube, and the like, and produces the large caliber high steel-grade corrosion-resistant seamless steel tube with the diameter of phi 219.0-phi460.0mm. The method has the effects of solving the problem of extremely unfavorable influence of the harmful elements such as P, S, and the like on the corrosion resistance of a petroleum-special tube and obtaining a high-quality round billet, adopts the combination of phi 460 three-roller retained mandrel POF rolling mill with high-end thermal rolling control technique to obtain fine quality tube bodies with different sizes, and obtains pipeline tubes with eligible surface quality and combination property by reasonable thermal treatment technique and the control technique of the residual stress of the steel tube, which not only has high strength and excellent corrosion-resistant property but also has good toughness. The invention has the beneficial effects that the steel tube has good physical-chemical properties, high tube body size precision, and convenience for use as well as being beneficial for the safety of long-distance delivery ducts, and can be widely used for the acid oil-gas fields containing hydrogen sulfide.

The invention belongs to the field of metal part manufacturing, and particularly discloses a metal part manufacturing system and method adopting the micro-casting-forging and milling-grinding in-situcomposite. The system involves a micro-casting-forging module, a milling module, a five-axis linkage workbench and a control device, wherein the micro-casting-forging module is connected with the milling module and comprises a fusion deposition sub-module and a roller-pressing rolling sub-module, the five-axis linkage workbench is positioned below the micro-casting-forging module and the milling module, and is used for containing metal parts to be formed, and the control device is connected with the fusion deposition sub-module, the roller-pressing rolling sub-module, the milling module and the five-axis linkage workbench. According to the system and method, micro-casting-forging and a milling process are composited to process and manufacture the metal parts, so that the problems that whenthe metal parts are made through the additive manufacturing, the structure is not uniform, the deformation is serious, the residual stress is large, the structure performance is poor, and the surfacequality is poor are solved, and the system and method is especially suitable for processing a high-performance complicated special-shaped element.