53results about How to "Different mechanical properties" patented technology

The invention discloses a silicon-aluminum-alloy-case-based three-dimensional assembling and packaging structure of a microwave module. The assembling and packaging structure comprises a split type case body and one or more functional units. The case body includes an inner cavity type shell and one and more flat type cover plates; the shell includes one or more inner cavities. In packaging, the inner cavity is in sealed connection by the cover plate; the function units are assembled to the bottom of the inner cavity and the inner side of the cover plate; and the case body is formed by stackingof at least three different silicon-aluminum alloy material with different components. The assembling and packaging structure has the following beneficial effects: three-dimensional assembling and packaging inside the microwave module are realized; compared with the traditional microwave module only assembling components at the bottom of the inner cavity of the shell, the assembling and packagingstructure enables the integration rate to be improved by two for four times; and with the silicon aluminum alloy, the size and the mass are reduced, the thermal stress reliability is improved, and the heat dissipation performance is enhanced.

The invention relates to a multilayer composite hard alloy product and a manufacturing method of the multilayer composite hard alloy product. Specifically, the invention discloses a multilayer composite hard alloy product, at least comprising a first layer of hard alloy (1) and a second layer of hard alloy (2) which is bonded with the first layer of hard alloy (1), wherein the combination between the first layer of hard alloy (1) and the second layer of hard alloy (2) is metallurgical bonding; and an apparent interface exists between the first layer of hard alloy (1) and the second layer of hard alloy (2). The invention also relates to a method for manufacturing the multilayer composite hard alloy product. The multilayer composite hard alloy product manufactured according to the invention has the advantages of simple, rapid and controllable manufacturing process, high reliability and high product property repeatability, and is capable of satisfying the specific working condition of having different requirements for the mechanical properties of different parts of the product.

The invention relates to a method for enhancing heat conduction performance of foamy carbon with high aperture ratio, aims at solving the defects that the foamy carbon with high aperture ratio is low in heat conduction and poor in dynamic performance. In the method, the hole wall of the foamy carbon is enhanced by medium-phase pitch through vacuuming/pressurization dipping-gradient pressure foaming method for a plurality of times, the enhanced foamy carbon is further subject to high-temperature graphitizing processing, thus forming enhanced type high-conduction foamy carbon. For the enhanced foamy carbon, heat conductivity of the volume is improved greatly, and the dynamic performance is improved obviously.

The invention relates to a novel preparation process for a thermal barrier coating. The novel preparation process comprises the following steps: generating a metal bonding bottom layer on the surfaceof a matrix; generating an in-situ thermal growth oxide layer (TGO); and generating a ceramic heat-insulating surface layer, wherein the TGO layer is pre-grown before the matrix serves. The TGO layercomprises alpha-aluminum oxide. A compact and continuous TGO layer which takes alpha-aluminum oxide as the principal component is preset through large-particle dry ice jetting and purifying rougheningtreatment and pre-vacuum argon gas oxidizing treatment. An oxide film has very good high-temperature oxidization resistance, prevents quick oxidization, reduces a layer thickness increase rate of theTGO layer, and achieves the purpose of reducing thermal barrier coating peel-off probability.

The invention discloses a dynamic polymer thermoplastic elastomer based energy absorbing method. The method is characterized in that a multi-section polymer molecule structural thermoplastic elastomerwith a plurality of end sections and one intermediate section is used for performing energy absorbing protection; the end sections of polymer molecules of the thermoplastic elastomer are subjected toreversible phase physical crosslinking; the intermediate section is at an amorphous state; at least some chain sections include at least one side hydrogen bond group, and the side hydrogen bond groups can be subjected to inter-chain super-molecule hydrogen bond dynamic crosslinking. According to the method, the dynamic polymer thermoplastic elastomer is treated as the energy absorbing material and has high damping, vibration absorbing, voice isolating, impact resisting and other functions during use based on the non-covalent property and the dynamic reversibility of hydrogen bonds, and particularly, can be applied to body protection in sports, daily life and work, military police body protection, explosion protection, airborne landing and aerial delivery protection, collision resistance of automobiles, impact resistance of electronic appliances, etc.

The invention relates to the technical field of rapid solidification powder high-temperature alloy, in particular to a dual-performance turbine disc and a preparation method thereof. The preparation method of the dual-performance turbine disc comprises the following steps of (a) respectively carrying out hot isostatic pressing forming on hub alloy powder and rim alloy powder to obtain a hub disc blank and a rim annular piece; (b) assembling the hub disc blank and the rim annular piece, and carrying out hot isostatic pressing diffusion connection to obtain a double-alloy disc blank; and (c) carrying out heat treatment on the double-alloy disc blank. Specific hub alloy powder and rim alloy powder are adopted, the same or similar hot isostatic pressing system and heat treatment system are achieved, meanwhile, different mechanical properties are achieved, the hub and the rim are in diffusion connection through hot isostatic pressing, the hub and the rim of the turbine disc have different mechanical properties, and the performance requirements of the high-performance aero-engine turbine disc under severe working conditions are met.

The invention belongs to the technical field of materials for high-speed train bodies, and particularly relates to a carbon fiber sandwich composite material and a preparation method and application thereof. The carbon fiber sandwich composite material comprises an upper skin, a lower skin and a middle core material. The layer structure of each skin comprises multiple layers of carbon fiber plaincloth-(an electromagnetic shielding layer-multiple layers of carbon fiber plain cloth)<n>, wherein n is smaller than or equal to 10. The core material is a polyimide aerogel plate. According to the invention, the specific core material is selected to be matched with the skins formed by specific compounding, so the advantages of low density, good environmental adaptability and high electromagneticshielding performance are achieved under the condition of ensuring bonding force; in addition, the carbon fiber sandwich composite material has the advantages of low room-temperature heat conductivity, good mechanical properties, excellent heat stability, good in flame retardant property and the like, is an ideal material for replacing aluminum profiles for the high-speed rail bodies, and can further improve the speed and carrying capacity of a high-speed rail.

The invention discloses a novel high-thermoplasticity PP super-thick plate and a processing method, and belongs to the technical field of novel processing and application of high polymer materials. The super-thick plate comprises a carbon fiber reinforced epoxy resin composite material upper skin, a carbon fiber reinforced epoxy resin composite material lower skin, a PP honeycomb plate, a group ofepoxy resin foam, a group of epoxy resin foam reinforced supports, an upper epoxy resin adhesive film and a lower epoxy resin adhesive film. According to the novel high-thermoplasticity PP super-thick plate, through the arrangement of the multi-layer laminated structure, the super-thick plate has scratch resistance, a modified plate layer further has high impact resistance, the physical characteristics of the plate can be greatly improved, and the universality of the plate is enhanced. The processing method of the novel high-thermoplasticity PP super-thick plate is simple in process and rapidin forming, improves the production efficiency, and reduces the production cost, so that industrial application in the industrial field is met.

The invention discloses a method for quickly separating vascular bundle, epidermis and mesophyll cells from plant leaves. The method includes following steps: S1, using a standard bleacher to disinfect the surfaces of seeds in a micro centrifugal tube; S2, transferring a culture medium in the S1 into a plant growth chamber for storage; S3, preparing a centrifugal tube of 1.5ml, and separating mesophyll protoplasm, wherein an enzyme solution of 1ml is placed in the centrifugal tube; S4, heating frozen enzyme liquid prepared in advance to 22-25 DEG C, and maintaining the same at room temperature in subsequent steps. The method is a separating technology scheme, and practices show that the method can separate out all three major leaf tissues (mesophyll, vascular bundle and epidermis) within 30min while purity is quite high.

The invention relates to a gas-phase polymerization method for catalyzing olefin homogeneous polymerization by a late transition metal catalyst. The gas-phase polymerization method comprises the following steps: dissolving a mixture of the late transition metal catalyst and a cocatalyst in a volatile organic solvent according to a molar ratio of 1:1-1:3 to form a catalyst solution; putting the obtained catalyst solution into a pressure reactor and uniformly coating the catalyst solution on the wall of the pressure reactor so as to form a catalyst film layer on the wall after the volatile organic solvent is volatilized; and introducing olefin gas, and carrying out a contact reaction on olefin and the catalyst film layer at a reaction pressure of 1-10 atmospheres and a reaction temperature of 20-80 DEG C to obtain the required olefin polymer. The polyolefin material with excellent performance can be synthesized by using the homogeneous gas-phase polymerization method, and the mechanicalproperties of the polyolefin material can be regulated and controlled by controlling the polymerization conditions. In addition, the homogeneous gas-phase polymerization method provided by the invention significantly reduces the use of organic solvents, and belongs to an economic and environment-friendly olefin polymerization mode.

The invention discloses a TaN coating and a preparation method thereof and application. The preparation method of the TaN coating comprises the following steps that a magnetron sputtering technology is used, a Ta pure metal target is taken as a target material, a nitrogen gas and a protective gas are taken as working gases, a negative bias voltage is applied to a substrate, a target electric rateis applied to the Ta pure metal target, and a TaN coating is deposited on the surface of the substrate, wherein the TaN coating has a face centered cubic crystal structure which is preferentially oriented with (200), and a face centered cubic crystal structure which is preferentially oriented with (111) or an amorphous structure. According to the TaN coating and the preparation method thereof andthe application, starting from the nitrogen content in the deposition process, the characteristics of various structures of the TaN coating is combined, a magnetron sputtering method is adopted and the nitrogen flow proportion is regulated and controlled to obtain the TaN coating with different structures; and the prepared TaN coating has high hardness, has stable performance at 800 DEG C, has good oxidation resistance, and has a potential application prospect in the field of South Sea high-temperature protection.

The invention discloses a method for preparing a special low-cost fertilizer for green tea. The method comprises the following steps: uniformly mixing ammonium nitrate, potassium sulfate, guano, EDTA iron chelate, manganese sulfate, molybdic acid, copper sulfate, borax and water, adding a sodium hydroxide solution with the concentration of 0.5wt% to 1.2wt% into the system so as to adjust the pH value of the system to 7.1 to 7.5, carrying out atomization, then, spraying the atomized system to the surface of silicon dioxide by a peristaltic pump for spray granulation, so as to obtain first coated granules; uniformly mixing plant ash, rabbit manure, bean dregs, marigolds, water and a compound-bacterium preparation, and carrying out sealed standing, so as to obtain a prefabricated material; subjecting hydrogenated castor oil and calcium palmitate to mixed fusion, adding the first coated granules, the prefabricated material into the fused mixture, carrying out mixing and stirring, and carrying out extruding granulation, so as to obtain second coated granules; and fusing hydrogenated palm oil, adding modified corn starch, activated carbon, kaolin, calcined argil and the second coated granules into the fused hydrogenated palm oil, carrying out uniform mixing, and then, carrying out spray granulation, thereby obtaining the special low-cost fertilizer for the green tea.

The invention relates to the field of biodegradable materials, and discloses a biodegradable in-situ nano composite material as well as a preparation method and application thereof. The nano compositematerial comprises first resin and second resin, wherein the first resin is prepared from the following components in percentage by mass: 0.1 to 15 percent of a nano filler and 85 to 99.9 percent ofresin with a number-average molecular weight of 500 to 10,000 kDa; and the second resin includes a resin having a number average molecular weight of 10,000 to 100,000 kDa. The nano filler is dispersedin the first resin with a low molecular weight, the first resin is prepared by adopting an in-situ synthesis method, and then the first resin is mixed with the second resin with higher molecular weight, so that the agglomeration of the nano filler can be effectively prevented, the mechanical property of the nano composite material is improved, and meanwhile, the effects of strengthening and toughening are achieved.

The invention discloses a preparation method for a high-performance composite line for a polypropylene-based composite material. The preparation method comprises the following steps that reinforced fibers with different thicknesses and base body fibers which are polypropylene fibers are used as raw materials, and the composite line is prepared by selecting the wrapping technology or the air injection network technology according to different finenesses of the reinforced fibers and the base body fibers; the reinforced fibers are one or two kinds of basalt fibers and glass fibers. The preparation method overcomes the performance shortcomings of simplex fibers, and improves the weavability of the composite line in the follow-up weaving and processing process, and the composite line is good in appearance and mechanical performance. Meanwhile, it is guaranteed that the composite line contains a large proportion of polypropylene fibers, the difference between the performance of the reinforced fibers and the performance of the polypropylene fibers is utilized, and therefore forming quality of follow-up fiber reinforced composite materials in the direct thermo-compression formation process is guaranteed.

The invention discloses hydrolysis-resistant polyester and a preparation method thereof as well as a hydrolysis-resistant film thereof as well as a preparation method and application of the hydrolysis-resistant film. The polyester is obtained by carrying out a reaction on components including dihydric alcohol, dibasic acid and maleic anhydride grafted polyolefin. And carrying out an extrusion film forming process on the polyester to obtain the polyester film. The polyester film can be applied to a solar cell backboard and has excellent hydrolysis resistance.

The invention discloses plastic hollow polymer microspheres with microchannels on surfaces as well as a preparation method and an application of the microspheres. The particle size of the plastic microspheres is 1-300 mu m, the thickness of a shell is 0.01-100 mu m, and the diameter of the microchannels is smaller than or equal to 0.05 mu m. The microspheres have elastic non-restorability, and after cavities of the plastic hollow polymer microspheres are filled with some substances, the substances in the cavities can be slowly released via the microchannels of the microspheres without externalforces; the microspheres are deformed and substances in the cavities are released quickly under the action of external forces; the deformed microspheres cannot restore when the external forces are removed. The microspheres belong to a macromolecular polymer material, have low density, good thermal insulation, sound insulation, light scattering performance and the like and can be widely applied tofields of medical treatment, cosmetics, cleaning/caring supplies (such as cleaning agents, caring agents and the like), sewage treatment, catalyst loading and the like.

The invention belongs to the field of welding and relates to a welding wire, in particular to a self-protecting flux-cored welding wire. The self-protecting flux-cored welding wire contains resin and a filling composition, wherein the filling composition is adhered through the resin and then is extruded through an extrusion molding machine to form the welding wire. The filling composition contains a welding arc stabilizer, a metal alloy, a welding slag composition and a gas forming agent. The welding wire is formed by adopting the filling composition adhered with the resin and then performing extrusion molding, and the compositions of the welding wire are even compared with an external metal shell of a flux-cored welding wire product in the prior art. When the self-protecting flux-cored welding wire is applied to welding, a resin base is combusted and decomposed, the composition at the center of the welding wire is connected with two welding parts in a uniform transition mode, so that uniform transition is produced between the two welding parts with the influence of high welding temperature, and breakage does not occur due to different thermal expansion coefficients.