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.

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.

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 discloses a heat-resisting casting Al-Cu alloy. The heat-resisting casting Al-Cu alloy comprises, by mass, 2.0-3.5% of Cu, 0.5-0.8% of Mn, 0.2-0.6% of Ti, 0.2-0.5% of Sc, 0.1-0.3% of Zr,0.2-0.35% of Cd, less than or equal to 0.1% of impurities, and the balance Al. The heat-resisting casting Al-Cu alloy is high in strength, good in ductility, and can be used for a long time at the high temperature of 280 DEG C. Compared with a traditional high copper ZL205A alloy, under the same T6 heat treatment condition (538 DEG C 15h+indoor temperature water quenching+175 DEG C 3h), the extension strength of the heat-resisting casting Al-Cu alloy is 20-30 MPa higher, and the strength is not declined at the temperature of 280 DEG C for 100h.

The invention discloses a solvent-tolerant acrylate composition and application thereof. The composition contains no tackifying resin, adopts a multifunctional phosphorus hydroxyl compound as a cross-linking agent, and has good solvent resistance. . The adhesive film prepared by applying it to the acrylate pressure-sensitive adhesive can withstand the penetration of polar and non-polar solvents at its bonding interface, and can be applied to places with many chemical solvents.

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.

The invention provides a method for improving the metallurgical quality of large-scale 2000-series aluminum alloy ingots. The method is suitable for large-scale flat ingots of 520mm (thickness)×1620mm (width) and large-scale round ingots with a diameter of 1000mm. The method is to jointly apply ultrasonic waves and electromagnetic waves to the aluminum liquid (for example, to the aluminum liquid in the front tank) during casting, and select the ultrasonic frequency, electromagnetic wave coupling parameters, casting temperature, casting speed, and water flow rate according to the alloy composition. The method can effectively reduce the casting stress of large-scale ingots, reduce cracks, reduce the degree of component segregation of ingots, reduce microporosity, avoid cracking of ingots, and improve the casting molding rate.

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.

A preparation method of a high-performance NdFeB rare earth permanent magnet material: (1) batching; (2) melting and casting; (3) preparing magnetic powder; (4) preparing a magnetic field forming green body; (5) cold isostatic pressing; (6) ) low-pressure sintering, put the cold isostatic pressing green body obtained in step (5) into a low-pressure sintering furnace, and when the vacuum is evacuated to the furnace pressure≤1×10 ‑2 Start to heat up at Pa, when the temperature rises to 900-1000°C and keep it warm for 0.5-1.0h, keep vacuuming during the above-mentioned heating and heat preservation process, stop vacuuming after the heat preservation is over, continue to maintain the temperature in the furnace at 900-1000°C and feed High-purity inert gas until the pressure in the furnace is 0.5-4MPa and heat-preservation and pressure-holding sintering for 5-30 minutes. After sintering, stop heat preservation and pass high-purity inert gas at room temperature to cool to room temperature to obtain a sintered magnet; (7) Two-stage heat treatment. The above method can obtain the NdFeB rare earth permanent magnet material with excellent comprehensive magnetic properties and reduce the cost.