10results about How to "Promote diffuse distribution" patented technology

The invention belongs to the technical field of preparation of aluminum-based composite materials, and particularly relates to a preparation method of a reinforced aluminum-based composite material through vacuum reciprocating smelting assisted thin-strip cast rolling. Comprising the steps of aluminum matrix material preparation, ceramic / aluminum matrix composite powder vacuum ball milling, aluminum matrix and ceramic / aluminum matrix composite powder vacuum reciprocating smelting, thin strip cast rolling, cast strip primary treatment, cast strip heat treatment, hot rolling, cold rolling, performance optimization and the like. An aluminum alloy matrix bar with specific components is selected, ceramic particle / aluminum matrix composite powder with the mass fraction of 5%-25% is prepared through vacuum ball milling, it is ensured that aluminum powder is completely attached to the surfaces of ceramic particles, and good wetting of the particles and an aluminum matrix is achieved. And then thin strip cast rolling, heat treatment, hot rolling, cold rolling and other treatments are carried out. And finally, the ceramic / aluminum-based composite material with the ceramic particles uniformly distributed on the matrix is prepared, and the ceramic / aluminum-based composite material shows excellent tensile strength, elongation and wear resistance and has no grain boundary segregation phenomenon.

The invention provides medium-entropy alloy composite powder for ultrahigh-speed laser cladding, a composite coating and application. The composite powder comprises medium-entropy alloy powder and Ni-coated WC powder. Wherein the mass fraction ratio of the medium-entropy alloy powder to the Ni-coated WC powder is (1-1.5): 1; the medium-entropy alloy powder comprises Fe, Cr, Ni and Ti, and the molar fraction ratio of Fe to Cr to Ni to Ti is 1: 1: 1: (0.4-0.75). The method has the technical effects that the ceramic strengthening phase is added into a medium-entropy alloy powder system, and in the ultra-high-speed laser cladding process, due to the fact that the laser absorptivity and the heat conductivity of Ni in the composite powder are low, the integrity of the WC ceramic phase is effectively protected, the wettability between the WC ceramic phase and a coating is improved through cladding of Ni, and the corrosion resistance of the WC ceramic phase is improved. And the binding force of a contact interface of the two is effectively enhanced, so that the preparation of the high-hardness and high-wear-resistance ceramic phase compounded medium-entropy alloy coating is realized.

This invention provides a method for improving the microstructure and corrosion uniformity of low-temperature extruded magnesium alloys, belonging to the field of magnesium alloy preparation and processing. The method includes the following steps: S1: Cutting a low-alloy element content magnesium alloy ingot and removing the surface oxide layer to obtain a cast sample; S2: Performing pulsed current homogenization treatment on the cast sample; S3: Removing the surface oxide layer from the homogenized alloy to process it into an extrusion billet; S4: Performing low-temperature extrusion treatment on the extrusion billet under pulsed current assistance. This invention improves the microstructure and corrosion uniformity of low-temperature extruded magnesium alloys while ensuring high strength and plasticity, and is suitable for the efficient and energy-saving preparation of biodegradable magnesium alloy extruded bars and sheets.

The application discloses a creep-resistant die-casting rare earth magnesium alloy with high strength and high fluidity, and a preparation method and application thereof. The application belongs to the field of die-casting magnesium alloys. The magnesium alloy comprises, in percentage by mass, Al: 4.8-7.2%, La: 3.0-4.2%, Sm: 1.2-2.0%, Y: 0.4-1.2%, Mn: 0.1-0.6%, Te: 0.01-0.1%, Bi: 0.01-0.5%, and the balance of Mg and inevitable impurity elements. The application significantly refines the structure of the magnesium alloy by optimizing the alloy composition, changes the composition, distribution and morphology of intermetallic compounds in the alloy, simultaneously generates Al-Te phases stable at high temperatures, improves the mechanical properties and creep resistance of the magnesium alloy, and further improves the die-casting fluidity of the magnesium alloy, so as to meet the requirements of large-scale integrated design automobile parts.

The present invention relates to a streamlined vibration quenching nucleation device and operation method, the device comprising: a crystallizer, arranged below an immersed water inlet at the bottom of an external tundish; a liquid metal cooling pool arranged on the side of the crystallizer; a cooling fan arranged on the side of the liquid metal cooling pool, thereby cooling the liquid metal cooling pool; a quenching nucleator arranged inside the crystallizer and connected with the liquid metal cooling pool, the quenching nucleator being streamlined; a cooling pipeline arranged between the liquid metal cooling pool and the quenching nucleator; a variable frequency pump arranged in the cooling pipeline; a vibration generator sleeved in the cooling pipeline and arranged between the variable frequency pump and the quenching nucleator; a baffle assembly arranged inside the quenching nucleator. The present invention sets the quenching nucleator to a streamlined shape, reduces the thickness of the solidified structure on the surface of the quenching nucleator, promotes the peeling of the crystal nucleus and the melting of the dendrite, increases the number of equiaxed crystal nucleus particles, and improves the internal quality of large continuous casting billets.

The application belongs to the technical field of alloy forging preparation, and particularly relates to a 05Cr17Ni4Cu4Nb forging preparation method for high-strength and high-toughness sealing rings. The 05Cr17Ni4Cu4Nb forging preparation method for high-strength and high-toughness sealing rings improves the strength of the forging matrix, reduces the crack propagation ability of the material, improves the crack propagation work of the material, and improves the toughness of the forging matrix. The 05Cr17Ni4Cu4Nb forging preparation method for high-strength and high-toughness sealing rings has high operability, improves the high-strength and high-toughness of the 05Cr17Ni4Cu4Nb sealing ring forging after heat deformation, cooling and direct aging.

The application discloses a kind of micro-nano hard ceramic phase composite reinforced laser cladding nickel-based wear-resistant coating and its preparation method and application.The preparation method uses discharge plasma ball milling process to mix micro-nano hard ceramic and Ni-based metal powder for modification treatment, utilizes the synergistic effect of plasma activation and mechanical ball milling force of pulse discharge, effectively breaks the nano ceramic phase agglomerate, realizes the uniform dispersion distribution of nano ceramic phase in composite powder;By adopting the optimization of laser cladding process parameters, and cooperating with ultrasonic vibration auxiliary and / or pulse laser composite energy input, etc. Regulating means, prepare the nickel-based wear-resistant coating with uniform and dense structure, high hardness, excellent wear resistance and good metallurgical bonding with base material, which can meet the service requirements of mining machinery, oil drilling and production, metallurgical roller and other harsh working conditions, and has wide application prospect.

This invention relates to a high-strength multiphase hot-rolled wire rod for 2360MPa grade stranded wire and its manufacturing method. The method involves rolling the wire rod into a high-carbon Mo-V system, followed by online molten salt weak quenching and toughening treatment. The wire rod undergoes rapid cooling in the initial molten salt treatment, transitioning from an austenitic state to a mixed phase region of bainite and sorbite, forming a microstructure dominated by bainite and sorbite. A subsequent molten salt treatment increases the molten salt temperature, promoting the decomposition of untransformed residual austenite into sorbite, followed by isothermal tempering. Finally, the wire rod undergoes slow cooling on a roller conveyor, resulting in a hot-rolled wire rod with a microstructure consisting of tempered bainite and tempered sorbite, comprising a multiphase microstructure. This allows for online control of the microstructure and toughness, achieving a tensile strength of 1574~1627MPa and a reduction of area of ​​28%~33%, reducing fluctuations in mechanical properties and balancing material cost and production efficiency. This eliminates the need for offline heat treatment to produce ultra-high-strength stranded wire, reducing the risk of wire breakage.

The invention relates to a metal surface structure nanocrystallization method based on in-situ shearing force, which comprises the following steps of: a, alternately laying a mixture of Ti powder, Al powder and WC powder in a mold, forming a laminated structure through cold pressing, and obtaining a block body with the density of 50-60% through cold pressing; b, the block obtained after cold pressing is heated and pressurized, the heating temperature ranges from 500 DEG C to 600 DEG C, and the density of the obtained block ranges from 70% to 80%; c, the heating and pressurizing state in the step b is kept, the temperature is increased to 800-900 DEG C, then the block is rotated, the rotating speed is 80-100 rad / min, the temperature is kept for 0.5-1 h, in the rotating process, WC powder particles serve as a grinding agent, adjacent Ti powder particles are crushed to be nanocrystallized, and the density of the finally obtained block is 90-95%; and d, finally, the block is subjected to high-temperature sintering, the heating temperature ranges from 1100 DEG C to 1200 DEG C, heat preservation is conducted for 0.5 h to 1 h, and after the block is cooled to the room temperature, the multi-layer metal material with the density of 100% and the nanometer structure is obtained. According to the method, due to interpenetration of the low-melting-point component and the high-melting-point component and maintenance of the reinforced particles in the morphology and position in the penetration process, the reinforced particles play a role in grinding the interior of the tissue in the high-pressure torsion process, and the reinforced particles are thoroughly fused into the tissue through high-temperature and high-pressure sintering after grinding, so that the high-temperature and high-pressure sintering effect is achieved. Therefore, the whole block structure is not easy to generate internal cracks.

This invention discloses an AgWCGr contact material and its preparation method. First, graphene is added to a silver nitrate solution. Then, ultrasonic cavitation is used to reduce graphene agglomeration. Subsequently, Ag is used to coat WC and graphene in a WC-graphene-silver nitrate mixed solution using a solvothermal method, improving the interfacial bonding between the components and the silver matrix. After coating, silver powder is added, and the components are uniformly mixed in the solution under mechanical stirring. The dried mixed powder is then repressed and sintered to obtain the AgWCGr contact material. This invention uses a combination of ultrasonic dispersion, chemical coating, and wet mixing to prepare AgWCGr mixed powder, which, after sintering, yields the AgWCGr contact material. This achieves a dispersed distribution of each component, improves the interfacial bonding between components, helps reduce arc erosion of the contact material, enhances the anti-welding performance of the contact material, and exhibits low and stable contact resistance and good machinability.