31results about How to "Improve the stability of mechanical properties" patented technology

The invention discloses silicate-based light-weight foam concrete and a preparation method thereof. The silicate-based light-weight foam concrete is prepared from silicate cement, an inorganic admixture, water, a foaming agent and an additive, wherein the mass ratio of the inorganic admixture to the silicate cement is 0.3 to 1.3; the water accounts for 35 to 65 percent by mass; and the foaming agent accounts for 3 to 10 percent by mass. The silicate-based light-weight foam concrete has the beneficial effects that the silicate cement is used as a cementing material; and compared with a sulfoaluminate-based material, the silicate-based light-weight foam concrete has the advantages that the carbonation resistance, the mechanical performance stability, the temperature tolerance and other properties are improved. By adjustment of the contents of all functional components (a thickening time control agent, a foam stabilizer, a water reducing agent, an anti-cracking component, an expanding agent and the like), the silicate-based light-weight foam concrete can conform to various preparation conditions of the silicate cement used as a base material.

The invention discloses a preparation method for a flexible transparent conductive thin film with high thermal stability. The preparation method comprises the steps of step 1, uniformly coating the surface of a tidy and smooth target substrate with a one-dimension-structured conductive metal nanomaterial, and forming a conductive network structure; step 2, performing blade coating on the surface of the target substrate with the conductive network structure to form a precursor coating layer containing fluorinated polyimide; step 3, performing a curing process on the precursor coating layer containing fluorinated polyimide through a gradient temperature rise manner; and step 4, peeling off the cured fluorinated polyimide contained film layer from the target substrate to obtain the required finished product. The invention also discloses a corresponding flexible transparent conductive thin film product and characteristics of the product. Through the preparation method, the flexible transparent conductive thin film can be prepared in an efficient manner, and the quality control can be performed conveniently; and the prepared flexible transparent conductive thin film has the characteristics of low sheet resistance, high visible light transmittance, anti-ultraviolet property, high flexibility, low surface roughness, excellent high-temperature endurance and the like.

The invention provides a structural laminwood and a preparation method thereof. The laminwood is stacked and glued by 2-7 layers of veneers, wherein the grade of the external layer veneer of the laminwood is equal to the grade of the adjacent internal layer veneer or higher than the adjacent internal layer veneer by one grade; the veneer grade is determined by the average value of flexural elastic modulus of the target grades of all veneers; and compared with the veneers with lower grades, the veneers with higher grades have greater average value of the flexural elastic modulus of the target grades. The method lengthens the stock lumbers of short dimensions by mechanical stress grading and uses the lengthened stock lumbers as the veneers, then configures the veneer structures according to a grade configuration principle and coldly presses and glues the veneers to prepare the structural laminwood. The laminwood has excellent structural performance and can be used for the components such as beams, columns, and the like in wood structure buildings or other buildings.

The invention relates to a medical high-strength Ti-6Al-4V alloy wire and a preparation technique and application thereof and belongs to the technical field of metal material preparation. The medical high-strength Ti-6Al-4V alloy wire comprises, by mass, 5.9%-6.3% of Al, 4.0%-4.3% of V, 0.10%-0.16% of O, 0.14%-0.22% of Fe and the balance Ti. The preparation technique comprises the steps of smelting, forging, two times of large-deformation rolling, cold drawing, intermediate annealing, temperature-control hot drawing, stress relief annealing of a semi-finished product, one-pass cold drawing, straightening and cutting-off, stress relief annealing, polishing and obtaining of a finished product. The medical high-strength Ti-6Al-4V alloy wire and the preparation technique and application thereof have the beneficial effects that the Ti-6Al-4V alloy wire is prepared through the technical process that heat machining, cold drawing and temperature-control hot drawing are combined, and the Ti-6Al-4V alloy wire has the advantages that the mechanical performance is high, the dimensional precision is high, the surface smoothness is high, and the structure property uniformity is good.

The invention relates to a full-automatic submerged-arc welding solid welding wire for nickel-saving high-manganese low-temperature steel. According to the technical scheme, the full-automatic submerged-arc welding solid welding wire is prepared from the following chemical components in percentage by weight: 0.20-0.45% of C, 0.03-0.10% of Si, 26-31% of Mn, less than or equal to 1.2% of Ni, 2-6% ofCr, less than or equal to 1% of Mo, 0.02-0.08% of N, less than or equal to 0.002% of P, less than or equal to 0.001% of S, and the balance of Fe and inevitable impurities. The production cost is low;formed weld metal has high elongation and stable mechanical properties, and the strength and low-temperature toughness of the weld metal are matched with those of the high-manganese low-temperature steel; and a welded joint has high strength and excellent ultralow-temperature toughness mechanical properties, and can meet the technical requirements on the room-temperature and low-temperature properties of LNG storage tanks prepared by welding.

The present invention belongs to the field of polypropylene film or mass materials, especially relates to the rolling-angle controllable, super-hydrophobic, polypropylene film or mass and its preparation method. Solving polypropylene in solvent, and passing through processes of shearing, heat treatment, cooling, phase separation/crystallization, solidification, shaping, and drying at last, the films or masses with different morphological crystal networks are formed. With the minimum rolling ability on film or mass surface, water drops will roll, while the rolling angle is between 0 degree and 1 degree, and with the maximum rolling ability, the drops will not roll, while the rolling angle is 90 degree or 180 degree. The contact angle between film or mass surface and water is larger than 150 degree. The present invention achieves the control of super-hydrophobic property and rolling angle of general polyolefin resin film, without any later modification by low-surface-energy materials (containing fluoride materials or silane, etc.), and has good surface-structure stability, wind and rain resistance, and chemical corrosion resistance.

The invention discloses an edible composite membrane with stable mechanical properties and a preparation method thereof. Soybean protein isolate and gelatin are subjected to steam cross-linking processing under the participation and assistance of kappa-carrageenan and under unique reaction conditions, so that the internal structure of soybean protein isolate and gelatin protein is reconstructed; and also by further choosing specific usage amount of various compositions and specific plasticizer compositions and ratio, protein forms a relatively compact uniform three-dimension stereo net structure, so that the stability of the membrane material is effectively improved, the variation amplitude of mechanical properties is relatively small within the storage period of 3 months, the tensile strength is reduced only by 5-12%, the composition membrane is increased in water permeability only by 5-8%, increased in oxygen permeability only by 3-5.5% and increased in carbon dioxide permeability only by 2-4.5%, the color and the transparency are not influenced, and the shelf life of food is prolonged. According to the composite membrane, the operation is simple, the product quality is stable and reliable, and the composite membrane is suitable for industrial production.

The invention discloses a method for rapidly preparing a carbon fiber reinforced titanium alloy layered composite material. The method comprises the following steps of S1, ultrasonically cleaning carbon fiber cloth and drying; S2, sequentially carrying out sensitization, activation and reduction on the dried carbon fiber cloth, and cleaning and drying; S3, plating nickel on the dried carbon fibercloth to obtain nickel-plated carbon fiber cloth; and S4, laying a nickel-plated carbon fiber cloth layer after the titanium alloy powder is laid on a plasma hot-pressing sintering mold, and then laying a titanium alloy powder layer, sequentially repeating the powder layer and the cloth layer paving process, and obtaining the carbon fiber reinforced titanium alloy layered composite material through discharge plasma hot-pressing sintering. According to the method, due to the fact that the heating rate is high, the heat preservation time is short and the pressure is high in the discharge plasmahot-pressing sintering process, and the isolation effect of the nickel-plated layer on the surface of the nickel-plated carbon fiber cloth to the the carbon fiber and the titanium alloy powder, the carbon fiber reinforced titanium alloy laminar composite material can be rapidly prepared, so that the integrity of the carbon fiber is ensured, and the mechanical property of the carbon fiber reinforced titanium alloy layered composite material is improved.

The invention discloses a low-cost low alloy steel coil and a manufacturing method thereof and belongs to the technical field of production of hot continuous rolled plates and strips. The chemical ingredients of the low-cost low alloy steel coil comprise, by mass percentage, 0.06%-0.08% of C, 0.50%-0.80% of Mn, not larger than 0.015% of P, not larger than 0.008% of S, 0.045%-0.075% of Ti, 0.04%-0.05% of Al, not larger than 0.004% of N, not larger than 0.0030% of O and the balance Fe and inevitable impurities. The manufacturing method comprises the step of converter smelting, the step of RH secondary refining, the step of continuous casting, heating and TMCP and the step of laminar cooling and coiling. By the adoption of the technical scheme, without the need for adding the expensive microalloying alloy elements such as Nb and V, the strength and toughness comprehensive performance of the obtained steel coil product can reach the same level of the existing microalloyed steel coil adopting Nb and V, and therefore the production cost is remarkably lowered. Meanwhile, the mechanical performance stability of the steel coil can be further improved, performance fluctuation is reduced, andproduction requirements can be well met.

The invention provides an engine cylinder block cast casting method. The engine cylinder block cast casting method is characterized in that metal-stream inoculation is carried out twice, and the time when a nucleating agent is added, the usage amount of the nucleating agent, the particle size and temperature of the nucleating agent, constituents of the nucleating agent and the mass percents of the constituents are controlled in each time of metal-stream inoculation. By means of the method, the problem that an existing cast is poor in tensile strength and uniformity of hardness can be solved, the metallographic phase, hardness, mechanical performance and other properties of the cast are greatly improved, and the mechanical property stability of the cast is greatly improved.

The invention belongs to the field of forging hot working, and relates to a forging method of a high-boss TC18 titanium alloy die forging. The method comprises the following steps: designing a final forging according to the shape of a part; taking the maximum projection plane of the final forging projected to the horizontal plane as the parting surface of the final forging; taking the maximum projection surface of the final forge piece which is overturned by 90 degrees and projected to the horizontal plane as a pre-forge piece parting surface; and pre-forging and finish-forging the blank with the boss according to the parting surface of the pre-forged piece and the parting surface of the finish-forged piece by adopting a cross-shaped cross die forging method.

The invention relates to the technical field of casting technologies and new materials, in particular to a preparation method of a high-strength and high-elongation clay sand as-cast QT700-10 ductile iron casting, which comprises the following steps: step 1, weighing a carburant, a scrap steel briquette, foundry returns and a pretreating agent in batches according to a batching list, adding the weighed materials into an electric furnace for smelting, sampling, analyzing the components of molten iron, adjusting the components to be qualified, and taking out the molten iron; keeping the temperature at 1520-1550 DEG C for 5-8 minutes, and slagging off; 2, molten iron is weighed and transferred to a spheroidizing bag, Cu and Sn micro-alloy is added for discharging and flushing, meanwhile, a spheroidizing line and an inoculation line are inserted for wire feeding spheroidizing inoculation, and scum is removed after completion of wire feeding spheroidizing inoculation; 3, the molten iron is transferred to a casting machine, a silicon-barium inoculant is added for ladle-to-ladle inoculation, and slag removal and temperature measurement are conducted after ladle-to-ladle inoculation is completed; 4, the automatic casting machine is started, an efficient inoculant is added, and stream inoculation is carried out; and 5, after pouring is finished, heat preservation is conducted for 2-4 h, box pushing and shakeout are conducted, the metallographic phase and performance of a casting are detected to be qualified, and a qualified casting is obtained. The requirements of mechanical parts for high-strength and high-toughness ductile iron castings and the requirement for light weight of automobile parts can be met.

The invention provides a bismaleimide resin composition. The bismaleimide resin composition is prepared from the following components in parts by weight: 100 parts of phosphorus-containing bismaleimide resin and 1 to 60 parts of epoxy resin, wherein the phosphorus-containing bismaleimide resin has a structure shown as a formula 1 and the formula 1 is shown in the description, wherein X is a phosphorus-containing group; R1 and R2 are hydrogen or alkyl; the R1 and the R2 can be the same or not. The bismaleimide resin composition provided by the invention has good interface cohesiveness with carbon fibers; a solidified matter of the bismaleimide resin composition and a composite material of the bismaleimide resin composition and the carbon fibers have high tensile strength and good toughnessand have the advantages of excellent mechanical property stability and good heat resistance, flame retarding performance and water resistance and the like, and are especially suitable for applicationwith large-size and durability requirements, such as airplanes, trains, automobiles and wind power generation blades.

The invention relates to equipment for acid leaching technological treatment, in particular to an acid leaching device for a fiber yarn rope. The acid leaching device comprises an acid leaching tank,a yarn carrying assembly, a driving motor and a heat exchange assembly, wherein the acid leaching tank is provided with an acid inlet and an acid outlet; the yarn carrying assembly is positioned inside the acid leaching tank and comprises a rotating shaft and a yarn reeling structure sleeving the rotating shaft; the driving motor is arranged outside the acid leaching tank and is used for driving the rotating shaft to rotate so as to drive the yarn reeling structure to rotate; the heat exchange assembly is arranged outside the acid leaching tank, communicates with the acid inlet and the acid outlet respectively, and is used for heating acid liquid at the acid outlet and then inputting the acid liquid into the acid inlet so as to complete heating of the acid liquid. The acid leaching devicecan increase the content of silicon oxide in a prepared high-silica glass fiber rope, improve the uniformity of a strength variation coefficient and improve the product quality and the production efficiency.

The invention discloses a method for improving performance uniformity of 780MPa-grade galvanized dual-phase steel, which comprises the following steps: (1) heating second-stage temperature control: controlling the temperature of strip steel at the heating second-stage to be 750-780 DEG C, and staying for 1-2 minutes; (2) controlling the temperature of a soaking section: controlling the temperature of the strip steel in the soaking section to be 750-780 DEG C, and keeping the standing time for 1-2 minutes; (3) controlling the temperature of an outlet of a slow cooling section: controlling the temperature of the outlet of the slow cooling section at 660-700 DEG C, and controlling the cooling speed of the slow cooling section at 10-20 DEG C/s; and (4) controlling the speed of the strip steel in the continuous annealing furnace: controlling the speed of the strip steel in the continuous annealing furnace to be 80-120m/min. By adjusting the phase change degree of the microscopic structure, the mechanical property uniformity is improved, the local performance fluctuation range is narrowed, and the mechanical property stability in the length direction of the strip steel can be effectively improved.

The invention provides polyurethane with biological stability and mechanical stability, a preparation method and application thereof, and a related medical implant material containing the polyurethane. The polyurethane with biological stability and mechanical stability is prepared by the following steps: (1) carrying out vacuum dehydration reaction on polyether glycol and polydimethylsiloxane glycol under a heating condition, cooling, adding diisocyanate and siloxane modified polyol at normal pressure, and carrying out prepolymerization reaction; and (2) adding a chain extender, uniformly stirring and mixing, carrying out a curing reaction at high temperature, and carrying out melt processing molding on a cured product to obtain the product. The polyurethane provided by the invention has the advantages of good biological stability, good hydrolysis resistance and oxidation resistance, good mechanical stability, high initial mechanical strength, small reduction amplitude of mechanical properties in a long-term use process, and basically no loss, and can be well used as a long-term implant material. The structural formula of the siloxane modified polyol is shown in the specification.