29 results about "Microstructure" patented technology

A castable high temperature aluminum alloy is cast by controlled solidification that combines composition design and solidification rate control to synergistically enhance the performance and versatility of the castable aluminum alloy for a wide range of elevated temperature applications. In one example, the aluminum alloy contains by weight approximately 1.0-20.0% of rare earth elements that contribute to the elevated temperature strength by forming a dispersion of insoluble particles via a eutectic microstructure. The aluminum alloy also includes approximately 0.1 to 15% by weight of minor alloy elements. Controlled solidification improves microstructural uniformity and refinement and provides the optimum structure and properties for the specific casting condition. The molten aluminum alloy is poured into an investment casing shell and lowered into a quenchant at a controlled rate. The molten aluminum alloy cools from the bottom of the investment casting shell upwardly to uniformly and quickly cool the aluminum alloy.

The invention provides an aluminum and aluminum alloy matrix aluminum nitride reinforced gradient composite surface layer. In the surface layer, aluminum and an aluminum alloy matrix are melted by nitrogen arc with a simple process to ensure that Al and N elements in a melting bath to perform nitridation reaction, namely Al reacts with N to generate AlN, so as to obtain the 'AlN reinforced gradient composite surface layer'. Compared with a thin surface nitridated (AlN) layer prepared by reactive sputtering, chemical vapor deposition, ion injection, plasma nitridation and other methods, the surface layer has large thickness (0.13-0.3mm), has the microstructural characteristic of surface gradient composites, and has remarkably improved microhardness and abrasion resistance compared with the aluminum and the aluminum alloy matrix.

The invention discloses a method for producing a large-specification Ti55531 alloy pancake. The method comprises the steps of cogging forging, intermediate forging, finished product forging and heat treatment. According to the method for producing the large-specification Ti55531 alloy pancake, a '' high + low + high + low '' forging process route is adopted, forging permeability of a blank is ensured by applying large-tonnage pressure provided by an 80 MN press, deformation of a single-phase area is large, and the deformation of the two-phase area is small; a single-phase area upsetting and drawing deformation is adopted as the main, meanwhile, forging deformation modes such as reversing upsetting and drawing and flat-square upsetting and drawing are introduced, anisotropy difference of materials is greatly reduced, the proper heat treatment is carried out, so that microstructure of the alloy is of a incomplete spheroidization state, the microstructure of the alloy is distinguished from a fully equiaxed structure, a microstructure which can coexist with beta-turn + equiaxed alpha + short rod-shaped alpha is obtained, so that fracture toughness is improved while the strength of thematerial is guaranteed, and good mechanical property matching is achieved.

The invention discloses a W-Mo-Re-HfC alloy material. The W-Mo-Re-HfC alloy material is prepared from the following raw materials by weight: 10% to 30% of molybdenum, 1% to 25% of rhenium, 0.2% to 10%of hafnium carbonate and the balances tungsten and inevitable impurities. The invention further provides a preparation method of the W-Mo-Re-HfC alloy material. The preparation method comprises the following steps of: (I) carrying out ball milling and uniformly mixing molybdenum powder, rhenium powder, hafnium carbonate powder and tungsten powder; and carrying out crushing and sieving after hydrogen reduction to obtain mixed powder; and (II) sintering the mixed powder in a vacuum hot-press sintering furnace, and then cooling the mixed powder with the furnace to obtain the W-Mo-Re-HfC alloy material. The preparation method of the W-Mo-Re-HfC alloy material disclosed by the invention is simple in a technological process; the prepared alloy material is low in oxygen content; the microstructure is uniform; a base body consists of W, Mo and Re solid solution phases; good plasticity is realized; submicron and nanometer HfC phases are uniformly distributed in the base body so that the alloymaterial is excellent in plasticity and also has good room-temperature and high-temperature strength.

The invention discloses a hardened ordinary cement paste thermal expansion coefficient multiscale predication method. The method comprises the following steps of: step A: dividing hardened ordinary cement paste into different scales according to microstructure composition, wherein the different scales comprise different typical phases; step B. acquiring the volume percentage composition of each phase in different scales of the hardened ordinary cement paste; and step C. sequentially calculating the thermal expansion coefficient of each scale of the hardened ordinary cement paste from the minimum scale by adopting an upward gradual homogenization method, wherein the thermal expansion coefficient of the maximal scale is the thermal expansion coefficient of the hardened ordinary cement paste. According to the invention, a hardened ordinary cement paste thermal expansion coefficient multiscale predication model is established according to cement and hydration product essential attributes as well as cement paste microstructure composition and development principle, so that the relationship between the cement paste microstructure and macro-properties is established, and the problems of multiple influence factors on the macro-properties of cement-based materials and high discretization of test data are solved essentially.

The invention provides a preparation method for polyvinyl alcohol/silicon dioxide composite microspheres and belongs to a preparation method for a composite microsphere material. Polyvinyl alcohol and tetraethyl orthosilicate are employed as raw materials, and polyvinyl alcohol/silicon dioxide (PVA/SiO2) composite microspheres are prepared in a water-in-oil system without any surfactants. Tetraethyl orthosilicate is hydrolyzed fully in a PVA solution in an acidic condition, and uniform PVA/SiO2 composite sol is formed; the sol is subjected to dispersion and crosslinking in a water-in-oil system without surfactants, and finally PVA/SiO2 composite microspheres are obtained. The technology is simple, the repeatability is good, energy consumption is low and the cost is low. Surfactant residual and agglomeration of nano inorganic particles in the process of preparing composite microspheres through a traditional emulsification method are avoided. The microspheres are advantaged by regular sphere, high dispersibility and uniform microstructure, and can be used as a drug carrier, an injection-type bone tissue repairing material or a heavy metal ion adsorption material.

The invention relates to a gas sensor based on a novel SnO2 nanorod monocrystalline material. The gas sensor comprises a substrate, an interdigital metal electrode layer and a sensing conductor, wherein the interdigital metal electrode layer is arranged on the substrate, and the sensing conductor is made of a SnO2 nanorod monocrystalline material with nodes on the surface and is arranged on the interdigital metal electrode layer. Since the sensing conductor of the gas sensor based on the novel SnO2 nanorod monocrystalline material is made of the SnO2 nanorod monocrystalline material with nodes on the surface, which can be produced on a large scale, and the SnO2 nanorod monocrystalline material is simple and easy to produce and has good repeatability and low production cost, the raw materials of the SnO2 nanorod monocrystalline material are easy to obtain; moreover, the SnO2 nanorod monocrystalline material consists of a large amount of nanorods in microstructure and has high surface ratio, therefore, the gas sensor has high sensitivity and is expected to be applied to industrial safety and other fields significantly.

An integrated non-linear complex oxide thin film heterostructure with a tailored microstructure architecture design and a method of fabrication thereof, inclusive, is provided. The tailored microstructure architecture design mitigates the undesirable effects of thermal strain, hence provides strain relief, which enables the desirable simultaneously achievement of a high permittivity and high dielectric Q/low dielectric loss in concert with one another. The material design and fabrication method thereof; enables enhanced performance, low cost NLCO-based tunable devices which possess desirable attributes including, but are not limited to, tunable device miniaturization, wide tunability, minimization of signal attenuation, reduced device operational power and enhanced operational range. Furthermore, the materials and related process science protocols are complementary metal oxide semiconductor compatible, scalable and affordable.

The invention belongs to the technical field of semiconductor materials, and particularly relates to a preparation method of a SnSe nanosheet. The preparation method of the SnSe nanosheet comprises the following steps that a vacuum coating method is adopted, SnSe is adopted as an evaporator source, a substrate is arranged above the SnSe evaporator source, the distance between the evaporator sourceand the substrate ranges from 2.4 cm to 2.6 cm, the temperature of vacuum coating ranges from 460 DEG C to 480 DEG C, the time of vacuum coating ranges from 5 min to 10 min, and the SnSe nanosheet isprepared on the surface of the substrate under the vacuum environment. A SnSe product with the nanosheet structure is prepared by improving relevant parameters of vacuum coating, and the technical problem that SnSe with the nanosheet microstructure cannot be prepared by an existing vacuum heat evaporation method is effectively solved.

The invention discloses a molecular dynamics-based nanoscale diamond friction wear process simulation method, and belongs to the field of tribology molecular dynamics method research. A potential function capable of reflecting nano-scale diamond characteristics is selected, and parameters of molecular dynamics simulation in system relaxation and molecular modeling software are set; and the influence of the temperature on the abrasion loss of the nanoscale diamond in the frictional abrasion process is calculated through molecular dynamics simulation software. A coordinate file simulated by a diamond model is calculated and output through lamps, visual software is imported for visual analysis, and internal information of the structure is obtained through section analysis. According to the invention, the microstructure change and the stress result of the nanoscale diamond in the frictional wear process can be simulated by adopting molecular dynamics, and the process of structural damage can be visually observed.

The invention discloses a graphene hybridized photocatalyst hydrogel, belonging to the field of nanometer materials. The graphene hybridized photocatalyst hydrogel is used for treatment of water pollution and prepared by using graphite oxide and a photocatalyst as raw materials through a reduction reaction and ultrasonic treatment. The graphene hybridized photocatalyst hydrogel provided by the invention can promote the dispersion of graphene oxide in water, avoids further aggregation of a nanoscale photocatalyst from generation in the process of hydrogel formation, can significantly improve the specific surface area and adsorption capacity, has more obvious three-dimensional cross-linked mesoporous microstructure, can realize the synergistic effect of adsorption enrichment and photocatalytic degradation, significantly reinforces the in-situ catalytic degradation ability of adsorbed and enriched pollutants, and can greatly improve the mineralization and removal efficiency of pollutants.

The present disclosure relates to mold components and imprint lithography techniques applied on the basis of organic mold materials in order to form polymer microstructure elements. It has been recognized that adapting surface characteristics of at least one mold component may significantly enhance performance of the lithography process, in particular with respect to suppressing residual polymer material, which in conventional strategies may have to be removed on the basis of an additional etch process.

The invention relates to the technical field of aluminum alloy material research, and discloses a high-strength cast aluminum alloy for an automobile. The content of each element in a silicon-aluminumalloy is adjusted, and the adverse effect of the silicon element on the alloy is eliminated; moreover, the effects of the conditions such as temperature and pressure on the microstructure and mechanical properties of a casting are controlled by utilizing an extrusion casting process; in the casting process, macroscopic shrinkage cavities and microscopic shrinkage porosity are remarkably eliminated, and crystal grains are refined; in the heat treatment process, the mechanical properties of the casting are further enhanced, and the strength of the casting is remarkably improved; and the tensilestrength reaches 375-380 MPa, the elongation reaches 12.7-13.0%, and the hardness reaches 126-128 HB. According to the high-strength cast aluminum alloy for the automobile, the problems that shrinkage cavities and shrinkage porosity occur in the casting process of a high-silicon aluminum alloy, and the crystal grains are coarse in the prior art can be solved, parts with complex properties can bemanufactured, the surface quality of the parts is high, the process is simple and efficient, and the production cost is reduced.

The invention discloses a vanadium dioxide (VO2) intelligent thermal control device with a longhorn beetle-imitating multistage structure and a preparation method thereof, and belongs to the technicalfield of intelligent thermal control coating layers. The problems that an existing intelligent thermal control device based on VO2 is small in emissivity change and high in solar absorption ratio aresolved. The VO2 intelligent thermal control device with the longhorn beetle-imitating multistage structure is composed of a semiconductor substrate layer, an infrared high-reflection metal layer, anHfO2 dielectric layer, a VO2 layer and a protective layer in sequence from bottom to top. The preparation method comprises the steps: 1, preparing the infrared high-reflection metal layer; 2, preparing a dielectric film; 3, preparing a VO2 film; 4, processing a microstructure; and 5, depositing a protective layer. The invention discloses the vanadium dioxide intelligent thermal control device withthe longhorn beetle-imitating multistage structure and the preparation thereof.

The invention discloses a dissociation-solidification abrasive particle composite wire saw cutting method for photovoltaic polycrystalline silicon cells. The method comprises the following steps: (1)photovoltaic polycrystalline silicon workpieces are cut through a sawing wire; (2) mortar with dissociated silicon carbide abrasive particles is sprayed to a cutting area; and the dissociated siliconcarbide abrasive particles are distributed and constrained in a spiral baked wire area without solidified abrasive particles on the surface of the sawing wire; and (3) in the sawing process, the photovoltaic polycrystalline silicon workpieces are cut by the sawing wire; and meanwhile, the dissociated silicon carbide abrasive particles in the mortar are constrained in the spiral baked wire area onthe surface of the sawing wire under movement of the sawing wire to grind a cutting surface to cut the photovoltaic polycrystalline silicon cells. The method adopts the dissociated abrasive particle and solidified abrasive particle composite wire saw cutting to grind the surfaces of slices during slicing, and removes cutting line marks and plastic smooth areas on the surfaces of the slices causedby solidification abrasive particle wire saw cutting to form microstructures similar to the surfaces of the dissociated abrasive particle wire saw slices on the surfaces of the slices.

The invention discloses a cigarette combustion cone fixing method and device. The cigarette combustion cone fixing method has the advantages that an internal structure of a cigarette combustion cone is obtained in situ, the defect of the traditional method that in situ observation can not be carried out on a microstructure inside a cigarette combustion cone part is overcome, the microstructure of the cigarette combustion cone is reserved to the utmost extent, and evidence is provided for intensively studying a cigarette combustion process and a harmful substance production mechanism.

The invention discloses a method for preparing a feeding nozzle for a continuous high-purity alumina melting furnace. The continuous high-purity alumina melting furnace consists of a cooling water jacket furnace shell 1, a carbon fiber heat insulation material 2, a ceramic inner container seat 3, graphite heating elements 4, a ceramic inner container 5, the feeding nozzle 6, a furnace body upper cover 7, an upper cooling cavity 8, a hearth 9, a lower cooling cavity 10 and a furnace body lower cover 11, wherein a cooling water jacket is adopted in the cooling water jacket furnace shell; and the feeding nozzle for the continuous high-purity alumina melting furnace is made of a composite material prepared from reactive sintered aluminum nitride and hafnium boride and used at the temperature of between 1,600 and 2,200 DEG C in the atmosphere of nitrogen. The feeding nozzle for the continuous high-purity alumina melting furnace have the advantages of uniform microstructure, high strength, high overall reliability, high oxidation resistance, high-purity alumina pollution prevention, capability of being used for long time at the temperature of 2,200 DEG C, continuous production, high production efficiency and the like.

The invention relates to a preparation method and application of waxberry-shaped nano silicon particles, which belong to the technical field of building materials. The technical problems that an existing concrete sealing curing agent is prone to whitening, and strength improvement is limited are solved. The concrete sealing curing agent is prepared from waxberry-shaped nano silicon particles with ultrahigh specific surface area and the like through a one-step mixing method. According to the curing agent disclosed by the invention, the ultrahigh specific surface area and microstructure characteristics of the waxberry-shaped nano silicon particles are effectively utilized, more reaction active sites are provided for free calcium ions in the nano silicon particles and concrete, stable and firm C-S-H permanent gel is formed, and meanwhile, the curing agent also serves as a physical anchoring point, and the curing strength is further improved. After uniform permeation, the curing agent can form a compact and firm protective layer with a hydrophobic effect, so that the compactness of the concrete is effectively enhanced, and the firmness, wear resistance, permeability resistance and saltpetering resistance of the concrete are greatly improved.

The invention relates to an information collection device bracket applied to an information tracing system. The information collection device bracket comprises a bottom end fixing part, a main expanding rod and a secondary expanding device. Through improvement of the material of a first rotating shaft and a second rotating shaft, the material comprises the following components in percentage by weight: 0.016-0.038% of C, 0.3-0.5% of Si, 1.0-1.9% of Mn, 19-22% of Cr, 6.6-8.0% of Ni, 0.02-0.25% of Nb, 0.02-0.06% of RE, 0.02-0.11% of N, less than 0.01% of S, less than 0.05% of P and the balance of Fe and inevitable impurities. Through improvement of microstructure, an information collection head is capable of carrying out all-angle information collection on a production line; and an information collection device is durable and is high in fatigue resistance.

The invention discloses a low-friction coefficient and low-ripple degree metal sheet. A plurality of tiny pits which are round or roughly circular are distributed in the surface of the metal sheet, the diameter of each pit is 30-150 microns, and the overlapping amount between every two adjacent pits is smaller than 10 percentage; and the proportion of the surface area of the portion, occupied by pits of each square millimeter, of the surface of the metal sheet where the pits are located is larger than 30%, and the number difference of the pits in any unit of square millimeter of the surface isless than 20%. According to the reasonable optimization design on the surface microstructure, the friction coefficient and the ripple degree can be effectively reduced, and the forming and painting performances of the material are improved.

The invention discloses an indium antimonide (InSb)-based strip micro-structure terahertz modulator and a preparation method thereof. The modulator comprises a Si substrate, an insulating layer grownon the Si substrate, and an InSb-based strip-type microstructure layer grown on the insulation layer; and the strip-type micro-structure layer is a copper-InSb mixed strip-type micro-structure or InSb-InSb mixed strip type micro-structure; a bright-state mode and a dark-state mode in the InSb mixed strip micro-structure mutually interfere to form Fano resonance; the frequency and amplitude of a resonance peak can be flexibly adjusted through the methods of using the InSb with different doping concentrations or changing the external temperature. The terahertz InSb mixed strip type micro-structure modulator disclosed by the invention can realize effective modulation on the incident terahertz wave, thereby realizing the Fano resonance transmission peak with a quality factor higher than 20, and the maximum peak value can reach 0.97, and the modulation depth is greater than 80%.