79results about How to "Promote diffuse distribution" patented technology

The invention discloses 590MPa-grade cold-rolled dual-phase steel with excellent hole-expanding performance and a production method thereof, and belongs to the technical field of rolled steel. The 590MPa-grade cold-rolled dual-phase steel is prepared from the following chemical components in percentage by mass: 0.06-0.09% of C, 1.4-2.1% of Si+Mn, 0.01-0.02% of Nb, 0.03-0.06% of Al, less than or equal to 0.06% of P, less than or equal 0.010% of S, less than or equal to 0.006% of N, and the balance of Fe and inevitable impurities. According to the dual-phase steel disclosed by the invention, volume fraction of ferrite in a micro structure is 70-80%, volume fraction of martensite is 10-25% and volume fraction of bainite is 5-10%. Low-Al content is adopted, and smelting casting is improved; crystalline grains are refined by a low-temperature rolling process of 540-600 DEG C and Nb micro-alloying, and diffused distribution of a hard phase (martensite and bainite) is promoted; and a sectional cooling process of slow cooling, quick cooling I and quick cooling II is adopted, so that a proper amount of bainite is obtained, and therefore, hole-expanding performance is improved.

The invention discloses a high-dispersive-distribution nano-TiB2 particle reinforced aluminum matrix composite material and a preparation method thereof. Firstly, a uniform-structure Al-TiB2 intermediate alloy is prepared through an ultrasound assisted mixed salt reaction (K2TiF6/KBF4-Al), wherein the average particle diameter of in-situ endogenous TiB2 particles is smaller than 100nm; the Al-TiB2 intermediate alloy and Al are used as raw materials, or Al-TiB2 intermediate alloy, Al and alloy elements are used as raw materials, the nano-TiB2 particles are introduced into an aluminum (alloy) matrix through an intermediate alloy dilution method, ultrasound agitation treatment is used as assistance, then pouring into a mold is performed, and ultrasound is applied during solidification (introduction through a bottom introduction method); and thus the high-dispersive-distribution nano-TiB2 particle reinforced aluminum matrix composite material is obtained.

A process for preparing the Al-base composition under strong magnetic field includes such steps as heating Al to 850 deg.C, holding the temp for 30 min, adding reinforcing Al2O3 particles (or short fibres), stirring, pouring in mould, solidifying for 20 min strong magnetic field system and cooling in air. Its equipment is composed of metallic ladle, heating system, thermoelectric couple, reinforcing material delivering pipe, stirring coil, casting mould, supporter, slide sprue, vacuum chamber or protecting gas chamber, and the strong magnetic field control system consisting of strong magnetic field genrator, cooling water pipe, alarm and temp control unit and insulating layer.

The invention provides a nanosheet array nickel cobalt oxide-carbon composite material, a method for preparing the same and application of the same. The method comprises the steps of: performing ultrasonic processing on wet tissues and obtaining wet tissue fibers after drying; adding nickel nitrate, cobalt nitrate, urea and hexamethylenetetramine into an ethanol aqueous solution to obtain a mixedsolution; soaking the wet tissue fibers into the mixed solution and then performing a hydrothermal reaction to obtain a wet tissue fiber base body carrying an Ni-Co precursor; performing a heating calcination reaction on the wet tissue fiber base body in a mixed gas atmosphere and, after cooling, obtaining the nanosheet array nickel cobalt oxide-carbon composite material. The method utilizes wet tissues which are common in daily life as templates, so that waste in life can be effectively utilized; the material is simple in operation method and is environmentally-friendly and the materials areeasy to obtain; the material has a broad application prospect in fields such as clean energy and catalysis. As an electrode of a super capacitor, the material has high specific capacitance and excellent circulation stability.

The invention discloses a high-strength enamel pan and a production technology thereof. The high-strength enamel pan comprises a cast iron pan body and an enamel glaze layer attached to the surface of the cast iron pan body, wherein the cast iron pan body comprises components including iron, manganese, vanadium, tungsten, aluminum, molybdenum, cerium and carbon, and the enamel glaze layer comprises raw materials including quartz, albite, calcined kaolin, magnets, shell powder, borax, iron oxide powder, aluminum oxide powder, silica powder and an additive. The adopted enamel glaze layer of the high-strength enamel pan adopts conventional ingredients such as the conventional quartz, potash feldspar, the calcined kaolin, the borax and the like, the magnets, the shell powder, the iron oxide powder, the aluminum oxide powder, the silica powder and the additive are also added, so that the enamel glaze layer sintered at the relatively lower temperature can have the same strength and density, and glaze layer damage caused by bumping is reduced as much as possible.

The invention discloses an aluminum-copper alloy welding wire suitable for wire material additive manufacturing. The aluminum-copper alloy welding wire is prepared from the following components of, bymass percentage, 0.3-0.5% of Manganese (Mn), 4.6-5.3% of Cuprum (Cu), 0.15-0.35% of Titanium (Ti), 0.0005-0.006% of Boron (B), 0.05-0.3% of Vanadium (V), 0.05-0.2% of Zirconium (Zr), 0.05-0.2% of Tin(Sn), not larger than 0.15% of Iron (Fe), not larger than 0.06% of Silicon (Si), not larger than 0.05% of magnesium (Mg), not larger than 0.1% of Zinc (Zn), not larger than 0.05% of other single impurity elements, not larger than 0.15% of total other impurity elements and the balance aluminum (Al). According to the welding wire, no toxic soot is generated during production and use, and the additive-forming accumulation body has uniform tissue, high strength and ductility mechanical properties and transverse and longitudinal uniformity and is free of toxic metal oxide on the surface.

The invention provides a preparation method of a layered double-scale magnesium alloy, and belongs to the field of light metal material processing. The method comprises the following steps that isothermal heating is carried out on a magnesium alloy plate blank subjected to heating homogenization at 280-370 DEG C for 20-30 min, then the first pass of rolling deformation is immediately carried out to obtain a deformed plate, wherein the strain rate of rolling is 3.5-4.9s<-1>; and after annealing is carried out on the deformed plate, the second pass of rolling deformation is carried out at 280-340 DEG C, wherein the strain rate of rolling is 6.0-7.1s<-1>. According to the preparation method of the layered double-scale magnesium alloy, the high strain rate and gradient cooling double-pass rolling are adopted so that the high-strength toughened magnesium alloy material with the layered double-scale organizational structure can be obtained, the alternate layered distribution of the ultra-fine crystal layer and the micron crystal layer is achieved, and the strength and the plastic toughness of the magnesium alloy are improved.

The invention discloses a method for preparing an in-situ particulate reinforced magnesium base composite material, which comprises three steps of preparing a precast block, preparing reinforced particulates and preparing a composite material. In the method, a Al-Ti-CaC2-C reinforced system is adopted; a self-propagation high-temperature synthesis method is used for producing TiC reinforced particulates and a Al-Ca compound in-situ in the precast block in vacuum or under the protection of inert gases; the reacted precast block is put into a magnesium alloy melt to melt and spread; and sufficient stirring is finished and pouring is carried out to prepare into the particulate reinforced magnesium base composite. The method has the advantages of relatively simple technology and low cost; in the particulate reinforced magnesium base composite, reinforcing phase particulates are fine, are distributed evenly, can be preferably combined with a matrix interface; and the prepared particulate reinforced magnesium base composite material has the advantages of good mechanical property, wear-resisting property and the like.

The invention discloses a preparation method of an Al3Sc-Al3Zr/Al composite material inoculant, and relates to aluminum-based alloy. The method comprises the steps that raw material preparation is conducted according to the mass percentage of each element in target alloy of 1.00%-2.00% of Sc, 1.00%-2.00% of Zr and the balanced Al; in-situ synthesis preparation and ultrasound treatment of block Al-Sc-Zr intermediate alloy are conducted; a strip-shaped Al3Sc-Al3Zr composite material inoculant product is prepared through a rapid solidifying technology. The method has the advantages that part of Sc with high price is replaced by adding low-cost Zr to reduce the cost of the product, and the defects of the failure of the dispersion distribution of core forming particles on a substrate, non-idealdispersion level, aggregation sedimentation in a melt of particles, large particular size, excessively large Al3Sc particles in Al-Sc alloy and excessively low number in the prior art are overcome.

The invention provides a lightweight fine grain titanium fiber pumice magnesium alloy composite material and a preparation method thereof. The composite material has high strength and excellent damping performance. The method has simple process and low production cost and is suitable for industrial production. The composite material takes magnesium alloy as a substrate on which fine grain titanium fibers and pumice particles are distributed, the size of grains of the fine grain titanium fibers is 1-10 mu m, the fine grain titanium fibers and the pumice particles account for 45-55% of the composite material by volume, and the weight ratio of the fine grain titanium fibers to the pumice particles is 1:1. The magnesium alloy substrate comprises the following chemical components in percentage by weight: 4%-8% of Al, 0.01%-0.05% of Gd, 0.01%-0.05% of Gr, 0.001%-0.005% of Mo, 0.03%-0.09% of Si, 0.003%-0.009% of V, 0.003%-0.09% of Sn and the balance Mg.

The invention discloses improved Sn-Ag-Cu lead-free solder and a preparation method thereof. Zr and Ni are added in Sn-Ag-Cu lead-free solder, the amount of the Zr and the amount of the Ni are controlled, addition of the Ni can further promote the dispersion distribution of the Zr so as to further refine the microstructure of the solder; the surface tension of a molten pool is reduced, a wetting and spreading area is expanded, and the welding wettability and the oxidation resistance of a solder alloy are improved; and formation of the defects such as cavities and bridging in the welding process is inhibited, surface oxidation of welding spots during the long-term use process is prevented, and the welding spots still have excellent electricity and heat conduction performance in long-term use. By means of the synergistic effect of the two elements, the welding wettability as well as the mechanical property, the high-temperature anti-aging performance and the electricity conduction and heat conduction performance of the welding spots are comprehensively improved, and the development requirements of electronic components are met.

The invention discloses a high-hardness titanium-based composite material. The titanium-based composite material is prepared from, by mass, 4.5%-5.5% of Al, 5%-6% of Mo, 3%-4% of V, 1%-2% of Cr, 1%-2% of Fe, 3%-5% of TiC and the balance Ti and inevitable impurities. Through the solution treatment strengthening effect of Al, Cr, Fe and Mo, TiC particles and a Ti matrix have good stress decomposition and strain coordination, and the hardening effect is achieved. The invention further provides a preparation method of the high-hardness titanium-based composite material, the micron-sized TiC particles and the raw materials are subjected to non-self-consumption vacuum arc melting, then homogenization, hot rolling, solid solution and aging are sequentially carried out, the high-hardness titanium-based composite material is obtained, the hardness can reach 50 HRC or above, the preparation method is simple in process. The invention is widely applied to the fields of spaceflight, military industry, civil use and the like, and economic benefits are remarkably improved.

The invention provides a finely crystalline iron-stibium fiber and pumice magnesium alloy composite material and a preparation method thereof. The composite material has high strength, and excellent damping performance. The method has the advantages of simple process, low production cost and suitability for industrial production. The composite material has the magnesium alloy serving as a matrix,finely crystalline iron-stibium fibers and pumice microparticles are distributed on the matrix, the crystalline grains of the iron-stibium fibers are 1 to 10 mu m, and the fibers and the pumice account for 45 to 55 volume percent of the composite material, wherein the weight ratio of the fibers to the pumice is 1:1.

The invention discloses a nanometer aluminum oxide reinforced 316L stainless steel composite material and a preparation method thereof. The preparation method comprises the following steps that mixed powder A is subjected to powder laying and laser forming, and a formed body is obtained; stress regulation and control are carried out on the formed body, and the nanometer aluminum oxide reinforced 316L stainless steel composite material is obtained; the mixed powder A is a mixed powder obtained by ball-milling 316L steel powder and pretreated Al2O3 powder together; and the pretreatment process of the Al2O3 powder comprises the steps that spherical Al2O3 is placed in NH4OH to be subjected to erosion treatment, washing and drying are carried out after erosion, and the pretreated Al2O3 powder is obtained. The nanometer aluminum oxide reinforced 316L stainless steel composite material contains 0.1%-0.2% of nanoscale Al2O3 particles and the balance a 316L matrix. According to the method, the nanometer aluminum oxide reinforced 316L stainless steel composite material is prepared through the laser melting technology, the method has the characteristics of being high in machining speed, high in efficiency and short in working procedure, meanwhile, the ceramic material Al2O3 can be evenly distributed in a 316L stainless steel matrix, the strength of 316L is remarkably improved, and the method has important significance for expanding the applicability of 316L.