34results about How to "Strong pinning effect" patented technology

The invention belongs to the technical field of material processing, in particular to a casting infiltration method for enhancing hardness and abrasive resistance of a surface layer of low-carbon alloy cast steel. The method comprises the steps of uniformly mixing iron powder and aluminum powder, adding tungsten concentrate powder, mixing with polyvinyl alcohol after uniformly mixing the iron powder, the aluminum powder and the tungsten concentrate powder, adding water to prepare pasty paint, coating an internal wall of a mold with the paint for 3-5 times, then drying, injecting smelted molten low-carbon alloy cast steel into the mold for casting, and when casting is finished, taking a casting out of the mold after the casting is solidified and cooled completely. According to the method, a series of chemical reactions occur during casting of the molten steel, a hard particle phase is generated, surface alloy of a low-carbon alloy cast steel workpiece exerts very good solution strengthening and pinning effects; hard particles and dislocation in a matrix have interaction to avoid dislocation movement, so that the yield strength and microhardness of the matrix are improved, the strengthening effect is significant, the thickness of an infiltration layer is great, and the binding property with the matrix is good.

The invention provides a casting method of a highly-conductive and heat-resisting electrode cross beam component. The method comprises the following steps of: 1. selecting alloy materials; 2. manufacturing a metal mold according with sizes of the component; 3. founding and forming casting alloy materials; 4. and performing thermal process to cast formed pieces; wherein the composition ingredients of the adopted alloy materials include elements of Al, Mg, Si, Zr, Ce and B; the mass percent content of each composition ingredient contains 0.5-1.0% of Mg, 0.4-0.8% of Si, 0.6-0.8% of Zr, 0.05-0.1% of Ce, and 0.03-0.06% of B; the allowance is Al and inevitable impurities; the mass percent ratio of the impurity elements contained in the alloy materials is that: Fe is less than or equal to 0.2%, Cu is less than or equal to 0.05%, Mn is less than or equal to 0.02%, Cr is less than or equal to 0.02%, Zn is less than or equal to 0.05% and Ti is less than or equal to 0.05%. With the casting method, the aluminum alloy electrode cross beam component with good thermal resistance, mechanical property and high electrical conductivity performance can be cast, the electric conductivity can be up to 45% IACS (International Annealed Copper Standard), the temperature can be up to 250 DEG C in long-term application, and the casting method can be used for manufacturing the electrode cross beam components needed by the industrial field of electrolytic zinc.

The invention provides an ultra-fine crystalline nickel base high-temperature alloy and a method for preparing the same, belonging to the high-temperature alloy steel field. The ultra-fine crystalline nickel base high-temperature alloy is particularly applicable to a high-temperature structural component which has high requirement to high-temperature strength and fatigue property, requires superplastic forming and has a complicated structure. The chemical compositions by weight percent of the ultra-fine crystalline nickel base high-temperature alloy are: 17 to 19 percent of Fe, 17 to 20 percent of Cr, 2.8 to 3.3 percent of Mo, 0 to 1.5 percent of W, 0.8 to 1.5 percent of Al, 0.3 to 1.3 percent of Ti, 4.7 to 5.7 percent of Nb, less than or equal to 0.015 percent of C, and the balance beingNi. The preparation method reasonably controls the parameter of a deformation process to allow the deformation temperature to be positioned in a grain boundary precipitated phase region and an austenite phase region which have higher solution temperatures, and uses powerful pinning action of a precipitated phase to the grain boundary to produce the ultra-fine crystalline alloy with a grade of grain fineness of between ASTM12 and ASTM13 grade. Compared with the prior art, the ultra-fine crystalline nickel base high-temperature alloy has simple alloy compositions, greatly reduces the resistanceto deformation during forming, has small loss to forging and rolling equipment, and prevents crystal grains from growing when the ultra-fine crystalline nickel base high-temperature alloy is heated for a long time at a high temperature.

The invention discloses a magnesium-lithium alloy, a preparation method thereof, and a preparation method of a magnesium-lithium alloy plate, wherein the magnesium-lithium alloy is composed of the following components by weight percentage: 10% to 15% of Li; 3% to 6% of Al ; 0.3% to 2.0% of Sr; 0.05% to 1.0% of Sc; 0.05 to 0.5% of Zr; limiting impurity elements Fe≦0.005%, Ni≦0.002%, Cu≦0.02%; the rest is Mg. The magnesium-lithium alloy provided by the present invention not only improves the heat resistance of the alloy through the addition of elements Sr and Sc, but also effectively overcomes the significant reduction in the mechanical properties of the alloy due to overaging of the β-phase magnesium-lithium alloy, and the Al 3 The enrichment of Sc at the solid-liquid interface can hinder the growth of dendrites, thereby refining the as-cast structure of the alloy, because the Al 3 The Sc phase is mostly distributed in the grain boundary, which has a strong pinning effect on the grain boundary, and can significantly improve the yield strength and tensile strength of the alloy.

The invention discloses a graphite material with a SiC doped layer and a preparation method of the graphite material. The preparation method of the graphite material with the SiC doped layer comprises the following step: by taking mixed powder of silicon-containing powder and boron nitride as a silicon source, performing liquid-phase siliconing sintering on a graphite material, thereby obtaining the graphite material with the SiC doped layer. The graphite material with the SiC doped layer prepared by using the method comprises a graphite substrate and the SiC doped layer on the surface of the graphite substrate, the SiC doped layer is well combined with the graphite substrate without thermal mismatch, the graphite material is good in oxidation and corrosion resistance and relatively low in cost, and a small amount of silicon is adhered to the surface of the graphite material.

The invention provides a preparing method of a nanocrystal Sm<2>Co<17> / Co double-phase composite permanent magnetic alloy, and belongs to the technical field of double-phase composite permanent magnetic alloys. The method includes smelting a pure Sm block, a Co block and an elementary substance of an added element under the protection of argon to obtain a multi-component parent phase alloy; allowing phases and component distribution of the parent phase alloy to be uniform by a plurality of times of remelting and homogenizing annealing; preparing the parent phase alloy into amorphous powder by utilization of high-energy ball milling under the protection of an inert gas; preparing the amorphous powder into an initial nanocrystal alloy block which is a metastable phase alloy by spark plasma sintering; and preparing the nanocrystal Sm<2>Co<17> / Co double-phase composite permanent magnetic alloy by a thermal treatment process. The method has advantages of uniform crystal grain size distribution, controllable crystal grain size, controllable phase composition, controllable phase stability, and the like.

The present invention relates to an aluminum magnesium silicon scandium zirconium series alloy and a preparation method thereof. The aluminum magnesium silicon scandium zirconium alloy adopts the element Zr, Sc, Zr / Sc composite microalloying scheme to obtain a subgrain texture containing a certain component The mixed crystal structure improves the overall strength and plasticity properties of the material. In this microalloying scheme, the element Sc is selected from 0.02% to 0.25%, the element Zr is selected from 0.04% to 0.18%, and when the two are combined, 0.08%≤Zr+Sc≤0.40% is selected, the purpose of which is to obtain a subgrain containing a certain component The mixed crystal structure of the texture improves the comprehensive strength and plastic properties of the material. The new aluminum-magnesium-silicon-scandium-zirconium alloy products produced by the method of the present invention have excellent corrosion resistance and weldability, compared with traditional aluminum-magnesium-silicon alloys. Higher strength and resistance to welding softening, tensile strength and yield strength increased by 20% to 36% and 30% to 51% respectively, and elongation is higher than 10%; welded joint strength is 51% to 54%, and the joint coefficient is from The 0.8 level was raised to the 0.9 level. The material product can be used for structural parts in the fields of aerospace, nuclear industry, transportation, ships, weapons and the like.

The invention relates to a method for predicting the grain size of the welded coarse-grained zone of micro-alloy steel, which belongs to the field of physical measurement. Firstly, the information of the prior austenite grain size in the microalloyed steel welded coarse-grained zone under three or more different heat inputs is obtained through thermal simulation; secondly, M in the grain growth kinetic formula is set 0 and P Z is an unknown constant, other parameters are known parameters and the corresponding reasonable values ​​are obtained by consulting the literature, and then the values ​​of the prior austenite grain size in the coarse-grained region under three different heat inputs are compared with the grain growth kinetics formula Fitting (by numerical integration and using the finite difference method), the best fit results in M 0 and P Z The numerical value; Finally, through this grain growth kinetics formula and the fitted M 0 and P Z The grain size of the microalloyed steel welded coarse-grained zone is calculated under different welding heat input, and the grain size of the microalloyed steel welded coarse-grained zone is predicted. The invention simplifies the fitting and calculation process, and provides an important basis for controlling the grain size of the microalloy steel welded coarse grain area.

The invention provides an electrical steel plate and a preparation method thereof. The electrical steel plate comprises a plate-shaped electrical steel substrate, etching grooves on the surface of the substrate and CaSiO3 phases distributed on the surface of the etching grooves, wherein the thickness of the substrate is 0.1 to 2 millimeters, and the diameter of the CaSiO3 phases is 1 to 100 nanometers. The preparation method comprises the following steps of: 1) carrying out laser etching treatment; 2) processing the etching grooves with CaO powder, wherein CaO and SiO2 on the surfaces of the etching grooves react to generate the CaSiO3 phases on the surfaces of the etching grooves; and 3) washing and drying the electrical steel plate. The CaSiO3 phases have strong pinning effects relative to tensile stress or dislocation of regions around the grooves, a processed laser etching product has excellent thermal resistance, the iron loss reduction effect generated by laser etching cannot be disappeared after the product is subjected to thermal insulation and annealing treatment at 800 DEG C for 2 hours, and the original magnetic performance is basically maintained. The method is simple in operation, and production and application at a large scale are promoted.

The invention discloses a thin film for controlling the shape of liquid droplets, a preparation method and application thereof. The preparation method of the thin film for controlling the droplet shape includes: providing a substrate; depositing a titanium metal layer on the substrate; writing a pattern on the titanium metal layer by laser direct writing technology to obtain a patterned Titanium metal layer: performing wet etching on the patterned titanium metal layer to obtain a film with a suspension cut structure. The thin film used for controlling the droplet shape prepared by the invention is formed with a hanging cut structure with sharp edges, which has a strong pinning effect on the liquid, thereby improving the robustness of the droplet shape.