36results about How to "Eliminate microporosity" patented technology

An aluminum silicon die cast alloy having a very low iron content and relatively high strontium content that prevents soldering to dies into die casting process. The alloys of the present invention also have a modified eutectic silicon and modified iron morphology, when iron is present, resulting in low microporosity and high impact properties. The alloy comprises 6-22% by weight silicon, 0.05 to 0.20% by weight strontium and the balance aluminum. Preferably, the alloy of the present invention contains in weight percent: 6-20% silicon, 0.05-0.10% strontium, 0.40% maximum iron and most preferably 0.20% maximum iron, 4.5% maximum copper, 0.50% maximum manganese, 0.60% maximum magnesium, 3.0% maximum zinc, balance aluminum. On cooling from the solution temperature, the strontium serves to modify the eutectic silicon structure as well as create an iron phase morphology change if iron is present, facilitating feeding through the aluminum interdendritic matrix. This, in turn, creates a finished die cast product with extremely low levels of microporosity defects. The strontium content also appears to create a non-wetting monolayer of strontium atoms on the surface of a molten casting, preventing die soldering, even at very low iron contents. The alloy may be used to cast any type of object and is particularly suited for casting outboard marine propellers, driveshaft housings, gear case housings, Gimbel rings and engine blocks.

A hypoeutectic aluminum silicon casting alloy having a refined primary silicon particle size and a modified iron morphology. The alloy includes 10 to 11.5% by weight silicon, 0.10 to 0.70% by weight magnesium and also contains 0.05 to 0.07% by weight strontium. On cooling from the solution temperature, the strontium serves to modify the silicon eutectic structure as well as create an iron phase morphology change. Such changes facilitate feeding through the aluminum interdendritic matrix. This, in turn, creates a finished die cast product with extremely low levels of microporosity defects. The alloy may be used to cast engine blocks for marine outboard and stern drive motors. Furthermore, when the magnesium levels are adjusted to approximately 0.10 to 0.20% by weight magnesium, propellers having a highly advantageous ductility may be obtained.

The invention relates to a wear-resisting low-carbon steel shot, a preparation method thereof and a centrifugal atomizing device, and belongs to the technical field of metal abrasives. The wear-resisting low-carbon steel shot consists of the following chemical components in percentage by mass: 0.1-0.3% of C, 0.2-1.0% of Si, 0.3-1.2% of Mn, 0-0.05% of S, 0-0.05% of P, 0.1-0.2% of Ti, 0.07-0.2% of Mo, 0.1-0.2% of V, 0.1-1.1% of Cr and the balance of Fe. The preparation method comprises the following steps: smelting, centrifugal atomizing and forming, drying, coarse screening, quenching and tempering. The centrifugal atomizing device comprises a water storage tank, a centrifugal rotary plate and a centrifugal atomizing tank, wherein the centrifugal atomizing tank sequentially passes through a water outlet pump, the water storage tank and a water inlet pump to form a circulating loop; the upper part of the centrifugal atomizing tank is provided with a centrifugal rotary plate; and the top of the centrifugal atomizing tank is provided with ring-shaped water slots which are distributed along the circumference. The wear-resisting low-carbon steel shot has the characteristics of impact resistance, high cleaning efficiency and fatigue resistance, and has wear-resisting times up to 3500-3600 times; the preparation method is simple and good in thermal treatment effect; and the used centrifugal atomizing device is simple in structure, low in cost and easy to realize.

The invention discloses an automobile air conditioner compressor hollow piston, which comprises aluminum alloy prepared from the following ingredients in percentage by weight: 11 to 13 percent of Si, 3.5 to 4.5 percent of Cu, 0.2 to 0.5 percent of Mg, 0.8 to 1.5 percent of Ni, 0.1 to 0.3 percent of Cr, 0.1 to 0.3 percent of C, 0 to 0.1 percent of Mn, 0 to 0.5 percent of Zn, 0 to 0.15 percent of Ti, 0.1 to 0.3 percent of RE and the balance Al. The invention also provides a production method of the automobile air conditioner compressor hollow piston. Through the selection and the control on elements in the aluminum alloy for the hollow piston, the intensity and the hardness of the piston are improved; through further improvement on the laser welding process, the welding seam fine porosity rate is reduced, the welding tension is enhanced, and the welding quality is improved, so the use performance of the hollow piston is improved, and the service life of the hollow piston is prolonged.

The invention belongs to the field of nickel-base high temperature alloy, and particularly relates to a novel process for optimizing the microstructure and performance of a low-rhenium single-crystal casting. The novel process is characterized in that an experimental means of combining a computer simulation software with differential thermal analysis is adopted, so that a heat treatment process system is determined more accurately; meanwhile, the hot isostatic pressing technology and the heat treatment technology are combined, the defects such as microporosity and shrinkage in the single-crystal casting are effectively eliminated, the surface recrystallization problem of the casting in the conventional method is avoided through complementary advantages, and both the strength and the endurance property of the single-crystal casting are improved; moreover, as a stepped temperature rising method is adopted, the phenomenon that the conventional heat treatment process can easily cause incipient melting in the casting is avoided; and besides, three times of aging treatment is adopted, the novel process has the advantage that more gamma' strengthening phases are precipitated compared with the conventional aging treatment, the strengthening phases are uniform in distribution, appropriate in sizes, and regular in shapes, and the anti-fatigue and anti-deformation performances of the alloy are further improved.

The invention provides a method for improving anti-penetrability of recycled concrete. The method comprises 1, partly replacing cement in cementing material by fly ash and slag powder, 2, limiting a recycled coarse aggregate replacement rate use range, 3, adding a proper amount of an entraining-type additive into a recycled concrete mixture, and 4, carrying out complete recycled concrete preparation. The method provides appropriate fly ash, ore powder and tea saponin mixing amounts, a recycled coarse aggregate replacement rate and difference of the recycled concrete from common concrete in preparation. The method is used for improving anti-penetrability and endurance performances of recycled concrete and promotes recycled concrete popularization and application.

The invention relates to a compound lithium iron phosphate material and a preparing method thereof, a positive electrode piece and a lithium ion battery, and belongs to the technical field of lithiumion batteries. The compound lithium iron phosphate material is prepared from, by mass, 75-85% of lithium iron phosphate, 10-25 parts of nickel cobalt lithium manganate, 1-2% of carbon nano tube and 1-2% of conductive black. The prepared compound lithium iron phosphate material is a high high-energy density compound lithium iron phosphate material, lithium iron phosphate, nickel cobalt lithium manganate, carbon nano tube and conductive black fill one another, the porosity among materials is lowered, and the compaction density of the materials is increased.

Methods for producing mesoporous beta zeolites from parent beta zeolites having a Si/Al molar ratio of at least 10 comprise selecting a target average mesoporous size between 2 nm and 8 nm for the parent beta zeolites, selecting a pore directing agent (PDA) based on the target average mesopore size, where a non-ionic surfactant, a small cationic surfactant has a molecular weight of greater than 100 grams/mole, or both may be selected as the PDA when the target average mesopore size is at least 5 nm, and a large cationic surfactant having a molecular weight of less than 100 grams/mole may be selected as the PDA when the target average mesopore size is less than 5 nm. The method further comprises adding the selected PDA to an alkaline solution to form a PDA-base mixture, and adding the parent beta zeolites to the PDA-base mixture to produce the mesoporous beta zeolites.

A copper film is annealed at high pressure to enhance grain growth and remove voids. Other films, such as dielectrics, may also be suitable. High pressure can be used in conjunction with temperatures lower than room temperature for annealing or higher temperatures may be used to further enhance grain growth.

The invention relates to the single crystal high-temperature alloy solidifying technique, including case, heating set, sample clamping framework and DC electric field generating set. The clamping framework is set under the case, composed of two clamping bars set on the bracket, one end of each clamping bar linked with the rotation shaft on the bracket, the other end linked through fastener, and the outer side of each clamping bar installed with tension spring, the other end of each tension spring fixed on the bracket, and the bracket opened with a through hole to make the sample pass through; the generating set is a close loop, formed by setting a programmable functional module in series between one end of the sample and one pole of the voltage-stailized source, and connecting the other end with the other pole through the clamping tool.

A preparation method of a high-strength and high-plasticity Inconel 718 alloy based on SLM comprises the following steps: S1, selective laser melting forming is conducted, specifically, an Inconel 718 alloy blank is printed through a selective laser melting method; and the Inconel 718 alloy blank is sequentially subjected to step S2: isostatic pressing heat treatment, step S3: stress relief annealing treatment, step S4: solution treatment and step S5: two-stage aging treatment, specifically, the temperature of isostatic pressing heat treatment is 1165-1170 DEG C, the pressure intensity is 125-135 Mpa, and the time is 210-270 min; the temperature of stress relief annealing is 790-810 DEG C, and the time of stress relief annealing is 20-40 min; the temperature of solution treatment is 940-960 DEG C, and the time of solution treatment is 20-40 min; and in two-stage aging treatment, the temperature of first-stage aging treatment is 750-770 DEG C, the time of first-stage aging treatment is 470-490 min, the temperature of second-stage aging treatment is 640-660 DEG C, and the time of second-stage aging treatment is 470-490 min. The Inconel 718 alloy prepared by the method has strength, plasticity and hardness and has excellent comprehensive mechanical properties, and the application of the Inconel 718 alloy can be expanded to the field of more precise and complex structures.

An additive for reducing voids after annealing of copper plating with through silicon via. The additive contains by weight percent: 0.05-1% of one or more of quaternized polyethylene imine and derivatives thereof having different molecular weights, and 1-10% of polyethylene glycol with an average molecular weight of 200-20000. The additive is used in combination with an electroplating solution of a copper methyl sulfonate system. The electroplating solution of a copper methyl sulfonate system contains 1-5 ml/L of the additive by volume ratio. The electroplating solution of a copper methyl sulfonate system contains by quality volume ratio: 50-110 g/L of copper ions, 5-50 g/L of methanesulfonic acid and 20-80 mg/L of chlorine ions. The electroplating solution also contains by volume ratio: 0.5-5 ml/L of accelerator, 5-20 ml/L of inhibitor and 5-10 ml/L of levelling agent. The additive for reducing voids after annealing of copper plating with through silicon via provided in the present invention can solve the problem of micro-voids between grain boundaries after high temperature annealing of copper plating.

The invention provides a method for improving the metallurgical quality of a large-specification 2000 series aluminum alloy ingot, and is suitable for a large-specification flat ingot with the size of 520mm (thickness) x 1620mm (width) and a large-specification round ingot with a diameter of 1000mm. The method comprises the following steps of: jointly applying ultrasonic waves and electromagnetic waves to molten aluminum (such as molten aluminum in a front groove) during casting; and selecting ultrasonic frequency, coupling parameters of electromagnetic waves, casting temperature, casting speed and water flow according to alloy components. According to the method, the casting stress of the large-specification cast ingot can be effectively reduced, cracks are reduced, the composition segregation degree of the cast ingot is reduced, microporosity is reduced, the cast ingot is prevented from cracking, and the casting forming rate is increased.

The invention discloses a solvent-tolerant acrylate composition and applications thereof, wherein the components of the composition do not contain a tackifying resin, a multifunctional phosphorus hydroxyl compound is used as a cross-linking agent, and the solvent tolerance is good. With the application of the adhesive film prepared from the solvent-tolerant acrylate composition to an acrylate pressure-sensitive adhesive, the adhesive film can tolerate permeation and the like of polar and non-polar solvents on a bonding interface of the acrylate pressure-sensitive adhesive, and can be applied to places with more chemical solvents.

The invention relates to a hollow fiber pore-forming agent and application thereof in fuel cells. The pore-forming agent is PAN-PVP coaxial hollow fiber prepared from peroxyacetyl nitrate and polyvinylpyrrolidone as raw materials, and a preparation method of the pore-forming agent comprises the following steps of preparing a PAN-PVP mixed solution from peroxyacetyl nitrate and polyvinylpyrrolidone; and then operating on a coaxial high-voltage electrostatic spinning machine, placing methyl silicone oil in an inner needle hole, placing the PAN-PVP mixed solution in an outer needle hole, and rotating a roller collector to collect the PAN-PVP coaxial hollow fiber. The PAN-PVP hollow fiber can form a three-dimensional network cross-linked cavity after a fuel cell anode is fired to remove the fiber, so that the connection of the anode in the hole is improved, the internal specific surface area of an electrolyte is increased, the activation polarization of the cell is integrally reduced, the electrochemical reaction area is increased, the internal resistance of the cell is reduced, and the substance diffusion is accelerated, and therefore, the output performance of the cell is finally improved, and attenuation of specific capacity is slowed down.

The invention belongs to the technical field of casting silicon-aluminum alloy, and particularly relates to a method for reducing microporosity of casting silicon-aluminum alloy. The method comprisesthe following steps that raw materials are prepared, the raw materials are added into a melting pool at 740 DEG C for melting, after keeping 5-10 minutes, the raw materials are heated up to 800-820 DEG C; when the raw materials are cooled down to 650-670 DEG C, acetic anhydride with the weight counting for 0.8-1.2% of furnace burden is added, slagging-off, discharging from a furnace and casting are carried out after treatment for 6-10 minutes, and heat treatment is carried out after the casting is completed. Compared with the prior art, the method has the following advantage that through scientifically proportioning the content of each element, refining process of a refining agent is omitted, the fluidity of the materials is improved by introducing nitrogen, the problem that the casting performance is lowered due to the content of silicon is solved, addition of dysprosium can effectively reduce the microporous rate of the alloy, surface tension of the alloy during the casting process is improved, and the mechanical properties of the alloy are improved.