73results about How to "Reduce embrittlement" patented technology

An Fe-based amorphous alloy ribbon having a composition comprising FeaSibBcCd and inevitable impurities, wherein a is 76 to 83.5 atomic %, b is 12 atomic % or less, c is 8 to 18 atomic %, and d is 0.01 to 3 atomic %, the concentration distribution of C measured radially from both surfaces to the inside of said Fe-based amorphous alloy ribbon having a peak within a depth of 2 to 20 nm.

The invention discloses nanostructure tungsten alloy and a preparation method thereof. The alloy mainly comprises tungsten, and also comprises 0.05 to 1.0wt percent of zirconium and 0.2 to 2.0wt percent of rare-earth metal oxide particles, wherein the rare-earth metal oxide particle adopts yttrium oxide particles, lanthanum oxide particles or cerium oxide particles distributed in tungsten crystal particle. The method comprises the steps of firstly preparing ammonium paratungstate, rare-earth metal nitrate, citric acid and deionized water into transparent mixed liquor, stirring the transparent mixed liquor, obtaining gel after reaction, heating and drying the gel, then calcining the gel, so as to obtain a mixed powder of tungsten oxide and rare-earth metal oxide, putting the mixed powder into hydrogen atmosphere, so as to obtaining a mixed powder of tungsten and rare-earth metal oxide after reduction reaction, mixing the mixed powder with zirconium and zirconium hydride powder, so as to obtain a mixed powder of tungsten, zirconium, or zirconium hydride, and rare-earth metal oxide, and finally performing compaction and sintering to the mixed powder, so as to obtain the nanostructure tungsten alloy. The nanostructure tungsten alloy can be applied to fields of lighting, high-temperature components, aerospace devices, high temperature resistance containers and the like.

The invention discloses a forging technology of a Hastelloy C-276. The forging technology comprises a pre-forging heat treatment process, a heating process and a forging process. The pre-forging heattreatment process is characterized in that an alloy material is heated to 980 DEG C-1020 DEG C, and heat is preserved for 1-1.5 hours; the material is heated to 1080 DEG C-1120 DEG C again, and heat is preserved for 15-16 hours; and the material is taken out of a furnace for air cooling. The heating process is characterized in that the alloy material is heated to 980 DEG C-1020 DEG C, and heat ispreserved for 1-1.5 hours; and the material is heated to 1140 DEG C-1160 DEG C again, and heat is preserved for 5-6 hours. The forging process is characterized in that multi-heating-number forging isadopted, wherein a temperature compensation device of a forging machine is adopted for heating during forging, and the final forging temperature of each heating number is controlled to be 1000 DEG C or above. According to the technology, a heat treatment technology is adopted, a precipitated phase of the Hastelloy C-276 is redissolved, so that grain boundary embrittlement is reduced, and forging cracks caused by weakening of grain boundary are eliminated; and the temperature compensation device is used for carrying out temperature compensation on the material in the forging process, so that the staying time of a blank in the forging temperature interval is prolonged, and then the forging time of each heating number is prolonged.

The invention provides phenolic foaming resin toughened with hydroxyl-terminated nitrile rubber and relates to phenolic foaming resin. The phenolic foaming resin is prepared from components a follows: phenolic compounds, aldehyde compounds, a modifier and a catalyst. The phenolic foaming resin is prepared through steps as follows: (1), the fused phenolic compounds and the basic catalyst are mixed, put in a water bath kettle and heated to 60 DEG C; (2), the aldehyde compounds are added in batches, and the addition is controlled to be finished within half an hour; (3), heat is preserved for half an hour after the aldehyde compounds are added completely, and the aldehyde compounds are enabled to react completely; (4), the modifier is added, a mixture is put in a magnetic stirrer, stirred for 10 min, heated, subjected to a reaction at the constant temperature for an hour and a half and cooled, PH is regulated to be 7-8 with a PH regulator, dehydration and cooling are performed for 24 h, and the modified target phenolic resin can be obtained. The modified phenolic resin has good mechanical properties and overall performance.

The invention provides a stir friction welding method for lap-joint welding of a first metal plate and a second metal plate. The hardness of the first metal plate is smaller than that of the second metal plate material, and a shaft shoulder and a stirring needle of a stirring head are pressed below the upper surface of the first metal plate and above the upper surface of the second metal plate. Pressure is applied to the stirring head, and the lower end face of the stirring needle is attached to and kept to the position above the upper surface of the second metal plate. Through stir friction welding, friction and heat generation are achieved on the surface of the upper-layer metal plate with the small hardness, the pressure is applied, an intermetallic compound is generated or diffusion happens or generation of the intermetallic compound and diffusion happen at the upper-lower junction face of the upper-layer plate and the lower-layer plate through control over the distance between thestirring needle and the upper surface of the lower-layer metal plate, and finally a dissimilar metal lap joint connector attractive in welding line forming and excellent in connector performance is obtained. The welding operation process is simple, and dissimilar metal lap-joint welding automation is easily achieved.

The invention relates to the technical field of road asphalt materials, in particular to a preparation method of high-strength composite modified emulsified asphalt. The asphalt has the advantages that the stability is better, the bonding strength is high, and the problems of wheel sticking, infirm inter-layer bonding, long maintenance time, insufficient shearing property and durability and the like in the construction process are reduced. The process is simple, the production cost can be effectively reduced, the viscosity and bonding performance of the emulsified asphalt are enhanced, and thedemulsification speed of the emulsified asphalt is increased; the composite modified emulsified asphalt is composed of high-strength composite modified asphalt and an emulsifier aqueous solution, theoil-water mass ratio of a mixture of the high-strength composite modified asphalt and the emulsifier aqueous solution is 60: 40-65: 35, that is, the content of evaporation residues of the high-strength composite modified emulsified asphalt is 60%-65%, and the preparation method comprises the following steps: S1, carrying out asphalt heating treatment; S2, preparing high-strength SBS modified asphalt; S3, preparing high-strength composite modified asphalt; S4, preparing an emulsifier aqueous solution; and S5, preparing the high-strength composite modified emulsified asphalt.

The invention provides a corrosion-resistant metal porous material and a preparation method and application thereof, and relates to the technical field of metal porous materials. The corrosion-resistant metal porous material comprises a metal porous material base material and a corrosion-resistant deposition layer metallurgically bonded on the surface of a porous framework of the metal porous material base material through chemical vapor deposition, wherein the corrosion-resistant deposition layer is a metal Ta layer or a metal Mo layer or an alternate composite layer of the metal Ta layer andthe metal Mo layer. The metal porous material can be bonded with Ta and Mo at a melting point far lower than that of Ta and Mo through chemical vapor deposition, and the chemical vapor deposition hashigh diffractivity, so that Ta and Mo can evenly and compactly surround the surface of the metal porous framework, and the corrosion resistance of the metal porous material is improved. The corrosion-resistant metal porous material has good corrosion resistance in sulfuric acid, hydrofluoric acid, hydrochloric acid, nitric acid and mixed acid of the sulfuric acid, the hydrofluoric acid, the hydrochloric acid and the nitric acid.

An additive for a silicone encapsulant has the structure: (I) R¹Ce(OSi—R²) I I a R³ wherein a is 3 or 4, wherein R¹ and R² are each —O—Si(R⁴)(R⁵)(R⁶) and each of R⁴, R⁵, and R⁶ is independently chosen from C₁-C₁₀ hydrocarbyl groups, C₁-C₁₀ alkyl groups, C₂-C₁₀ alkenyl groups, and C₆-C₁₀ aryl groups, and wherein R³ is independently chosen from C₁-C₁₀ hydrocarbyl groups, C₁-C₁₀ alkyl groups, C₂-C₁₀ alkenyl groups, and C₆-C₁₀ aryl groups. More specifically, the cerium is cerium (III) or (IV). The additive is formed using a method that includes the step of reacting cerium metal or a cerium (III) or (IV) compound with a hydroxyl functional organosiloxane. An encapsulant includes the additive and a polyorganosiloxane. The encapsulant can be utilized to form a device that includes an optoelectronic component and the encapsulant disposed on the optoelectronic component. The device is formed using a method that includes the step of disposing the encapsulant on the optoelectronic device.

The invention discloses a formula of an austenite heat-resisting alloy mesh belt wire for a continuous mesh belt furnace and a preparation method of the mesh belt wire. The austenite heat-resisting alloy mesh belt wire consists of the following components in percentage by weight: 0.01-0.20% of C, 0.005-3.5% of Si, 0.01-2.5% of Mn, less than or equal to 0.035% of P, less than or equal to 0.030% of S, 22-27% of Cr, 18-26.0% of Ni, 0.05-2.5% of Co, 0.05-1.0% of Nb, 0.05-0.25% of Mo, 0.02-0.50% of N, 0.05-1.0% of W, added mixed metal rare-earth alloy that contains 0.003-0.50% of rare earth, and the balance of Fe and inevitable impurities. The austenite heat-resisting alloy mesh belt wire is provided in order to overcome the problems of a mesh belt wire for an existing continuous heat treatment furnace which is short in service life and is easy to become deformed and to cause brittle fracture. The austenite heat-resisting alloy mesh belt wire can further improve the high-temperature strength of austenite heat-resisting alloy, prolong service life and significantly reduce an effect of embrittlement.

The invention discloses a method for reducing corner cracks of a medium-carbon boron-containing steel continuous casting sheet billet. The method mainly solves the technical problem that the corner crack defect of an existing medium-carbon boron-containing steel continuous casting sheet billet is difficult to control. The method for reducing the corner cracks of the medium-carbon boron-containing steel continuous casting sheet billet comprises the following steps of 1) adjusting the equipment precision of a straight arc-shaped continuous casting machine, and ensuring that the arc alignment precision of a crystallizer foot roller and a bent section is less than or equal to 0.15 mm; and (2) pouring the continuous casting sheet billet, specifically, adopting the straight arc-shaped continuous casting machine for pouring the sheet billet, enabling the superheat degree of tundish molten steel to be 15-25 DEG C, increasing the corner temperature in a weak cooling manner, enabling the water amount of the wide face of a crystallizer to be 3650-3850 L/min, enabling the water amount of the narrow face of the crystallizer to be 460-480 L/min, and controlling the temperature of the corners of the sheet billet before straightening to be 900 DEG C. By means of the method, titanium is adopted as an optimized alloy element, the equipment precision of the continuous casting machine is controlled, and the corner crack rate of the continuous casting sheet billet is smaller than or equal to 0.05%.

The invention mainly relates to the technical field of construction and discloses a weather-proof modified asphalt. The weather-proof modified asphalt is prepared from the following raw materials: 95-100 parts of matrix asphalt, 2.2-2.4 parts of water, 2.1-2.3 parts of nanometer titanium dioxide, 1.7-1.9 parts of SBS asphalt modifier, 1.1-1.3 parts of fatty alcohol polyoxyethylene ether ammonium sulfate, 0.3-0.5 part of asphalt stabilizer and 0.5-0.7 part of graphene. The weather-proof modified asphalt provided by the invention has the advantages of extensive source of raw materials, simple preparation, low cost, high weather fastness, ageing delaying effect, high fatigue damage resistance and anti-rutting performance under high-temperature and rainy conditions, capability of avoiding embrittlement and cracking under low temperature, high stability and capability of prolonging service life of road. Nanometer titanium dioxide and SBS asphalt modifier are added after matrix asphalt is heated and molten, so that fluidity and weather fastness of asphalt can be promoted and construction difficulty can be reduced.

The invention relates to a wire rod for a Cr-Mo steel submerged arc welding wire and a manufacturing method thereof. The wire rod is prepared from the following chemical components in percentage by mass: 0.10-0.20% of C, 0.10-0.60% of Si, 1.0-1.5% of Mn, 2.0-3.0% of Cr, 0.95-1.15% of Mo, 0.3-0.5% of V, 0.01-0.05% of Nb, 0.01-0.20% of Ni, 0.01-0.20% of Cu, and the balance of Fe and inevitable impurity elements. The wire rod produced through steelmaking, refining, continuous casting, controlled rolling and cooling and annealing can be used for welding during manufacture of high-strength Cr and Mo steel, and good temper brittleness resistance and good high-temperature endurance performance of welded metal are guaranteed through the component design and high-purity requirements of the wire rod.

The invention discloses a high chromium steel roller which comprises a jacket and a core, wherein the jacket comprises the following components by mass percentage: 1.1-1.3% of C, 0.9-1.1% of Si, 0.4-0.6% of Mn, less than or equal to 0.03% of P, less than or equal to 0.03% of S, 10.4-10.6% of Cr, 0.7-0.9% of Ni, 0.9-1.1% of Mo, 0.2-0.4% of V, 0.2-0.4% of Re, and the balance of Fe; and the core comprises the following components by mass percentage: 3.3-3.5% of C, 1.9-2.1% of Si, 0.4-0.6% of Mn, less than or equal to 0.1% of P, less than or equal to 0.03% of S, less than or equal to 0.03% of Cr, 0.4-0.8% of Ni, 0.2-0.4% of Mo, 0.04-0.06% of Re, and the balance of Fe. With the adoption of the mode, the rigidity of the high chromium steel roller can be improved; the roller has good abrasive resistance and hot tearing resistance; and the possibility of slipping during steel rolling is low.

A laser block assembly (LBA) gas fill process device with improved cathode electrode connectors. An example device includes a gas fill component that attaches to an LBA under test and electrical connectors that receive a voltage bias from a voltage source and apply the voltage bias to cathodes of the LBA. The electrical connectors include an end having a torsion spring that is sized based on the cathodes of the LBA. Also, the electrical connectors may include a strain relief spring.