52results about How to "Unique microstructure" patented technology

The invention belongs to the field of nano-structured metal materials, and specifically related to an (111) texture nano-grade twin crystal Cu block material and a preparation method thereof. The microstructure of the material is composed of columnar crystal grains with sizes of 1-50 micrometers. High-density nano-grade twin crystal lamellar structures are uniformly distributed in the crystal grains. The thicknesses of the twin crystal lamellar structures are 30 nanometers to hundreds of nanometers. The structural characteristics of the material are that: the materials have an (111) texture, columnar crystal grains, and low-angle boundaries; the nano-grade twin crystal lamellar structures and sigma3 coherent twin crystal interfaces are perpendicular to a growth direction; the grain sizes and twin crystal lamellar structures can grow under control; and the strength of the blocks can reach 10 times that of macro-crystal Cu. According to the invention, a direct current electrodeposition technology is adopted, and the technological conditions are slightly changed, wherein an appropriate plating bath composition and appropriate deposition parameters are controlled. According to the invention, performance problems of Cu materials in prior arts can be solved, and a Cu material with excellent performance, high strength, high thermal stability, high conductivity and high plasticity can be obtained.

The invention relates to high-strength high-plasticity copper-containing high-carbon TWIP steel and a preparation process thereof. In the preparation process, the carbon content is improved on the basis of Fe-Mn-C series TWIP steel, a non-carbide forming element Cu and rare earth Ce serving as alloying elements are added into the steel, and a solution treatment process at the high temperature of between 900 and 1,050 DEG C and a hot rolling process are combined, so that gap defects in an ingot structure are reduced and the intrinsic strength and plasticity of the high-carbon copper-containingTWIP steel are fully exerted. The prepared alloy steel has the outstanding characteristic that product of strength and plasticity for reflecting the comprehensive mechanical property of the alloy steel is obviously improved; the yield strength of the alloy steel is 513.7MPa, the tensile strength is 1,223.7MPa, the elongation is 86.8 percent, and the product of strength and plasticity reaches 106,217.2MPa. percent which is 20 percent higher than highest data 87,882MPa. percent of multiple kinds of TWIP steel reported by domestic and foreign documents at present; and novel high-strength high-toughness steel is prepared for the mechanical manufacturing industry and equipment industry.

The invention relates to a high temperature resistant elastic graphene aerogel and a preparation method thereof. The method comprises the following steps: (1) stirring and mixing a graphene oxide solution, a reducing agent, a surfactant and a silica sol evenly to obtain a precursor foam; (2) subjecting the precursor foam to a hydrothermal reduction reaction to obtain a graphene wet gel with silica sol suspended in the pores; (3) performing the steps of directional freezing and freeze-drying on the graphene wet gel to obtain pores The graphene aerogel that is loaded with silica nanoparticles on the wall; (4) the graphene aerogel is thermally annealed at a high temperature under an inert atmosphere to obtain a high temperature resistant elasticity that is covered with a thin layer of silica nanoparticles on the pore wall Graphene aerogel. The invention prepares graphene aerogel with high temperature resistance and high elasticity, greatly improves the temperature resistance of graphene aerogel materials in an aerobic environment from not more than 600 DEG C commonly reported to 800 DEG C, and broadens its application in High temperature and high elasticity applications.

A nano-class twin-crystal copper material with ultrahigh strength and ultrahigh electric conductivity is prepared by electrolytic deposition technique. The resultant high-purity polycrystal copper material features that its microstructure is composed of nearly equiaxed submicron (300-1000 nm) crystals, and in the crystal there are high-density parallel twin crystal layers with different orientations. Its advantages are high yield strength up to 900 MPa and break strength up to 1086 MPa, and high electric conductivity (1.75+ / - 0.02 X to the power -8 ohm.m).

The invention relates to a Co-modified metal organic framework-derived ZrO2 / C electromagnetic wave absorbing material, and a preparation method and an application thereof. The electromagnetic wave absorbing material is of a three-dimensional network structure formed by interweaving one-dimensional fibers. The fiber is composed of a carbonaceous matrix, ZrO2 and Co nanoparticles. The Co nanoparticles are embedded in the surface of the carbonaceous matrix uniformly distributed by ZrO2. The method comprises the steps that 1, a cobalt source, a zirconium source, an anhydrous acetic acid organic ligand and DMF are processed into a solvothermal solution, the organic ligand containing a carbon source, an MOF precursor is obtained after solvothermal reaction, the MOF precursor is washed and dried,then the MOF precursor is treated with the cobalt source, and cobalt source composite MOF is obtained; and (2) the compounded MOF precursor is placed in a protective atmosphere to convert cobalt ionsin a cobalt source into elemental cobalt, a zirconium source into ZrO2 and an organic ligand into a carbon matrix, thereby obtaining the catalyst. According to the preparation method disclosed by theinvention, ZrO2, Co and C are effectively subjected to nanoscale compounding, so that the prepared material has excellent performance.

The invention belongs to the field of preparing a steel material and in particular relates to a method for preparing a twin crystal induced plastic steel material with high carbon content. The twin crystal induced plastic steel material comprises the following compositions in the range: 0.2 to 0.49weight percent or 0.55 to 1.5weight percent of C, 10 to 22weight percent or 23.1 to 35weight percentof Mn, less than 1weight percent of Al, less than 1weight percent of Si, less than 0.008 percent of S, less than 0.02 percent of P and the balance being Fe and inevitable impurities. The preparation method comprises the following steps: a plate blank prepared through smelting is subjected to a hot rolling process to obtain a hot rolled sheet in a use state; or the plate blank is subjected to hot rolling and cold rolling to obtain a cold rolled sheet; the sheet is subjected to heat treatment in order that the tensile strength is between 750 and 1,200 MPa, the yield strength is between 230 and 615 MPa, the extension rate is between 45 and 70 percent; and no tough brittle turning point exists at a temperature of more than 100 DEG C. The steel material with high strength and high plasticity has excellent comprehensive mechanical performance, machining performance and forming performance, can be used for a steel rail of a railroad, automobile manufacture, engineering machinery, an oil and gas transportation pipeline, a liquefied natural gas transportation ship, war industry and other industries and has important value and great application space for an automobile industry and a war industry with rapid development.

The invention discloses a preparation method and application of a high specific surface area biomass activated carbon material co-doped with magnesium and nitrogen. The activated carbon has a unique three-dimensional composite pore structure of macropores-mesopores-micropores, which is characterized by co-doping of magnesium and nitrogen. The method uses biomass waste hemp core as raw material. After cleaning, drying and shearing pretreatment, the raw material is soaked in a mixed solution of zinc chloride and magnesium chloride for a period of time, dried and put into a tube furnace. Carbonization activation and cooling under the atmosphere. After the resultant is acid-washed and washed with water, it is immersed in an ethanol solution of aminopyridine for a period of time and then dried to obtain the activated carbon co-doped with magnesium and nitrogen. The activated carbon has a high specific surface area and exhibits excellent carbon dioxide gas adsorption performance.

A method for preparing non-spherical silicon dioxide particles of the invention belongs to the technical field of nano particle preparation. Using tetraethyl orthosilicate as the silicon source, ammonia water as the catalyst, and quaternary ammonium salts as the morphology regulator, the “sea urchin-like” or “beam-like” is prepared by the sol-gel method in the alcohol / water system. Silica particles. The preparation conditions of the invention are mild, the environment is friendly, and the prepared silicon dioxide particle has a unique shape and structure, and has very superior application value in the aspects of drug carrier, drug delivery, hard template agent and the like.