48results about How to "Reduce coarsening" patented technology

The invention discloses an abrasion-proof and corrosion-resistant nickel-based alloy wire and a preparation method thereof. The alloy wire comprises the following components: 17-21% of C, 20-25% of Co, 1.8-2.2% of W, 6.4-9.5% of Mo, 1.4-1.8% of Al, 3.2-4.5% of Ti, 0.1-0.5% of Nb, 0.1-0.5% of Hf, 1.2-1.8% of Ta, 0.03-0.06% of Re, 0.01-0.05% of Ce, 0.02-0.1% of C, 0.005-0.015% of B, 0.02-0.07% of Zr, 0.005-0.008% of Mg, and the balance Ni. The preparation technology of the alloy comprises the steps of vacuum smelting, remelting, forging, hot rolling, drawing, solid solution treatment and aging treatment, namely, raw materials are prepared and smelted based on mass percent and then smelted; the smelted materials are forged and rolled into obtain alloyed wire rods; the alloyed wire rods are drawn at a plurality of times to obtain phi 0.05-0.4mm alloy wires; finally the alloy wires are subjected to solid solution treatment and aging treatment. The abrasion-proof and corrosion-resistant nickel-based alloy wire can be used as a brush wire material for brush sealing of an aircraft engine, a gas turbine, etc., thus the brush sealing effect can be effectively improved, and the service life can be prolonged.

The invention relates to a preparation method of a directionally-distributed TiB whisker reinforced titanium-based composite material, and belongs to the field of metal-based composite materials. Thepreparation method comprises the following steps that nano TiB2 powder and titanium powder, or nano TiB2 powder and titanium alloy powder are uniformly mixed; sintering treatment is carried out on themixed powder by adopting a discharge plasma system to obtain a composite material block body; and the dried composite material block body is packaged in a quartz tube in a vacuum mode, heat treatmentis carried out in a heat treatment furnace, and then the composite material is obtained by step-by-step cooling. The method can effectively regulate and control the organization evolution of a TiB whisker in the titanium-based composite material, the problem that the orientation regulation and control means of the TiB whisker is single is fully solved, a thermal deformation means is used for regulating and controlling the crystal whisker form, and the crystal whisker length-diameter ratio is greatly reduced and the like.

The invention discloses a structure controlled preparation method for an Nb-Si-based complex alloy. According to the method, the structure of the Nb-Si-based complex alloy is controlled by adopting a combined process of unbalanced quick directional solidification and heat treatment; and the faceted growth property of silicide in the alloy is weakened, dimensions of a reinforcing phase Nb5Si3 and an anti-oxidation phase Cr2Nb in the alloy are remarkably reduced, a Nbss phase is used as the matrix in the steady-state structure of the Nb-Si-based complex alloy, the reinforcing phase Nb5Si3 is uniformly distributed on the matrix in a wormlike shape, and the anti-oxidation phase Cr2Nb is uniformly distributed or fixedly dissolved in the matrix in a granular shape, wherein the average length of the wormlike Nb5Si3 phase is less than 20 microns, the width of the Nb5Si3 phase is 5 microns, the size of the granular Cr2Nb phase is less than 10 microns, and the content of the two phases is not less than 35 percent. By structure control, the alloy contains enough Nb5Si3 and Cr2Nb phases, so that the alloy has good room temperature toughness and ductility on the premise of achieving excellent high-temperature mechanical property and oxidation resistance.

A frozen aerated confection comprising an ice structuring protein (ISP) and a hydrophobin is provided.

An electrolyzer cell is disclosed which includes a cathode to reduce an oxygen-containing molecule, such as H2O, CO₂, or a combination thereof, to produce an oxygen ion and a fuel molecule, such as H₂, CO, or a combination thereof. An electrolyte is coupled to the cathode to transport the oxygen ion to an anode. The anode is coupled to the electrolyte to receive the oxygen ion and produce oxygen gas therewith. In one embodiment, the anode may be fabricated to include an electron-conducting phase having a perovskite crystalline structure or structure similar thereto. This perovskite may have a chemical formula of substantially (Pr(_1-x)La_x)(z-y)A′_yBO(3-∂), wherein 0<x<1, 0≦y≦0.5, and 0.8 ≦z≦1.1. In another embodiment, the cathode includes an electron-conducting phase that contains nickel oxide intermixed with magnesium oxide.

The invention provides a martensitic steel whose main elements include: 8.0-8.8wt% Cr, 1.3-1.7wt% W, 0.15-0.25wt% V, 0.15-0.25wt% Ta, 0.30- 0.70wt% Mn, 0.06-0.10wt% C, 0.02-0.06wt% N, 0.005-0.015wt% Zr; this application reduces Cr content and adds N element to partially replace C element, so that the material can be processed During the process, the precipitation of M23C6 is reduced; and by strictly controlling the composition ratio of each forming element of the MX phase, it is ensured that Ta and V are precipitated in the form of MX phase to the greatest extent. At the same time, the application adopts a special heat treatment process to obtain dispersed and fine MX phases, effectively improving the high-temperature performance of the material during service.

The invention discloses a single-arc dual-wire pipeline welding method. The single-arc dual-wire pipeline welding method comprises the following steps of firstly, carrying out preparation before welding, wherein the specifications and the quality of two pipelines to be welded are checked, and groove preparation and polishing are carried out; secondly, carrying out groove condition checking, wherein the two sides of each groove are cleaned, and it is guaranteed that grooves are flat and smooth; thirdly, sending the two pipelines to be welded into a spot welder for butt joint, and completing root welding; fourthly, setting the mode and technological parameters of self-adaptation control automatic welding apparatus; and fifth, using the set self-adaptation control automatic welding apparatusto carry out hot welding, and filling welding and cosmetic welding on the pipelines subjected to root welding till completing the whole process of welding operation. With the single-arc dual-wire pipeline welding method, the welding deposition rate is large, the welding speed is high, welding cracks are effectively lessened, the welding speed is obviously increased, the welding quality is obviously improved, the degree of welding heat affected zone microstructure coarsening and softening is reduced, and it is beneficial for improvement on the mechanical properties of a welded joint.

The invention belongs to the technical field of nonferrous metal material manufacturing, and particularly relates to a heat treatment process of a low-alloying Al-Mg-Si alloy. The process is aimed atthe phenomenon that the low-alloying Al-Mg-Si alloy is used for extruding a product, the special heat treatment systems of high-temperature extrusion, three-level online quenching cooling and dual-stage aging high firstly and low at the later period are adopted, and the alloy obtains mechanical property and electrical property good matching. The heat treatment process is adopted, the low-alloyingAl-Mg-Si alloy can obtain the property matching with the tensile strength being 150 MPa, the elongation being 14%, and the specific conductance being 59% IACS or above, or the tensile strength being 180 MPa, the elongation being 12%, and the specific conductance being 57% IACS or above, and through the process, the application of the Al-Mg-Si alloy to the power industry is effectively promoted.

A method for producing a weldable titanium alloy and/or composite wire. The method includes: a) forming a green object by blending particulates of titanium sponge with one or more powdered alloying additions and cold compacting the blended mixture and subjecting the blended mixture including lubricant to pressure; b) forming a work body of alloyed titanium by heating the green object in a protected atmosphere and holding the temperature for a period of at least 4 hours, and then hot working the green object at a temperature of less than 200° C. apart from the beta transition temperature of the titanium alloy and shaping the green object to obtain an elongated profile; and c) forming the welding wire by placing the elongated profile of the work body in a rolling mill having one or more rolls disposed in series.

The invention discloses a bismuth telluride nanoparticle strengthened tin, silver and copper solder and a using method thereof. The solder is prepared from, by weight percent, 0.5%-1% of bismuth telluride nanoparticles, 80%-90% of tin, silver and copper micrometer powder and 10%-20% of soldering flux. The average particle size of the bismuth telluride nanoparticles is 20 nm, and the atom ratio of the tellurium element to the bismuth element is 3:2. The average particle size of the tin, silver and copper micrometer powder is 30 microns, and the weight percentage of the tin element to the silver element to the copper element is 96.50%:3.0%:0.5%. The soldering flux is a rosin soldering flux. The invention further provides the using method of the bismuth telluride nanoparticle strengthened tin, silver and copper solder. According to the bismuth telluride nanoparticle strengthened tin, silver and copper solder and the using method of the bismuth telluride nanoparticle strengthened tin, silver and copper solder, by selecting the proper nanoparticles, the problems, such as nanoparticle losses, nanoparticle coarsening and interfaces of the nanoparticles and the tin, silver and copper solder, of the nanoparticle strengthened tin, silver and copper solder are solved.

The invention relates to a preparation method for a magnesium-based composite material, in particular to a preparation method for lost foam casting of a high-entropy alloy particle-reinforced magnesium-based composite material. The method aims to solve the technical problem that in the preparation process of an existing magnesium-based composite material, the addition proportion of magnesium alloywaste is small, and the strength is poor when a large amount of magnesium alloy waste is added. By adopting a lost foam casting method, utilizing two-way shear stirring, adding high-entropy alloy particles and performing ultrasonic treatment in the casting process, structure heredity is effectively improved, uneven dispersion of the particles at different positions of a magnesium alloy melt is avoided, structure coarsening is reduced, grain growth in the solidification process is inhibited, grains are refined, the utilization rate of magnesium alloy waste is increased, and the performance ofthe lost foam casting product is improved. In the method, the utilization rate of AZ91D waste is high, the maximum waste addition amount accounts for 34% of the total mass, raw materials are saved, and costs are reduced. The method is also suitable for continuous production operation and is an environment-friendly method.

The invention belongs to the field of casing manufacturing and particularly relates to a low-chrome-alloy grinding ball. The low-chrome-alloy grinding ball is prepared from 2.0-3.3% of C, 1.75-2.2% ofSi, 1.3-2.6% of Mn, 1.5-2.5% of Cr, 0.25-0.50% of Cu, 0.05-0.12% of Ti, smaller than or equal to 0.02% of S, smaller than or equal to 0.02% of P and the balance Fe. According to the low-chrome-alloygrinding ball, through reasonable matching of high chrome alloy, the content of precious metal Mo is lowered, and the cost is reduced. The obtained high-chrome casting gold material is high in rigidity and impact toughness, the HRC can reach 60, and the impact value reaches 12 J/cm<2>. The impact fatigue life of a falling sphere is greater than or equal to 9,500 times, the damage percentage is smaller than 0.9%, and the cost is lowered.