8results about How to "Dense grain" patented technology

The invention relates to the technical field of metal materials, and discloses an Al-Zn heat-treatment-free aluminum alloy and a preparation method and application thereof. The Al-Zn series heat treatment-free aluminum alloy is prepared from the following components in percentage by mass: 8.0 percent to 18.0 percent of Zn, 4.0 percent to 9.0 percent of Si, 0.5 percent to 4.0 percent of Cu, 0.3 percent to 1.2 percent of Mn, 0.1 percent to 0.5 percent of Zr, 0.1 percent to 0.9 percent of V, 0.1 percent to 0.4 percent of Er, 0.05 percent to 0.6 percent of Sr, 1.0 percent to 3.0 percent of TiC / TiB2 and the balance of Al and inevitable impurities. The Al-Zn heat-treatment-free aluminum alloy provided by the invention is compact in structure, fine in crystal grain, uniform in solute element distribution and excellent in mechanical property, and can meet the application requirements of the fields of automobiles and spaceflight on aluminum alloy materials.

The invention discloses a method for strengthening formation and denitrification performance of salt-tolerant aerobic granular sludge in high-salinity wastewater treatment, which comprises the following specific implementation processes: culturing S-AGS by taking activated sludge of a town sewage treatment system and salt-tolerant sludge of an industrial wastewater treatment system as a mixed inoculum, and optimizing the operating conditions of an SBR (sequencing batch reactor); 16SrRNA high-throughput sequencing and co-occurrence network analysis are applied to identify S-AGS core species, a theoretical basis is provided for directional strengthening of structural stability and denitrification performance of the S-AGS core species, screening and expanding culture are performed on core functional strains, Thaura T-1 and PseudofuvimonasP-1 obtained through screening and expanding culture are compounded to prepare a composite functional microbial inoculum, and on the basis of mixed inoculum and reactor conditions, the composite functional microbial inoculum can be used for preparing the high-efficiency denitrification agent for the S-AGS. The composite functional microbial agent is added, so that the synergistic strengthening effect on the denitrification performance of the S-AGS is achieved. According to the method, mixed sludge is inoculated, efficient nitrogen and carbon removal performance is achieved under high salt stress, a core strain is screened and subjected to expanding culture and compounded to serve as a composite functional bacterial agent, and the nitrogen removal efficiency of nitrification / denitrification in the biological treatment process under salt stress can be improved.

The invention relates to the technical field of ceramic cutters, in particular to a SiC whisker toughened aluminum oxide ceramic cutter and a preparation method thereof. The invention relates to a SiC whisker toughened aluminum oxide ceramic cutting tool. The SiC whisker toughened aluminum oxide ceramic cutting tool consists of aluminum oxide ceramic powder, silicon carbide whiskers and toughening auxiliary powder, the toughening auxiliary powder is prepared from the following raw materials in parts by weight: 20 to 30 parts of ferrotitanium slag and 6 to 10 parts of chromium sesquioxide. The SiC whisker toughened aluminum oxide ceramic cutter provided by the invention is compact in structure and has more excellent fracture toughness at the same time.

The invention provides an aluminum alloy bar reducing casting device and method, and relates to the technical field of casting, the device comprises a tundish, a crystallizer, a structure control device and a traction device; the structure control device is composed of a first sleeve and a cooling module, a reducing cavity is formed in the first sleeve, the inner diameter of the reducing cavity is gradually reduced from the first end to the second end, and the reducing cavity is used for cooling and solidifying the solid-liquid aluminum alloy bar; the traction device comprises a traction head forming die and a power device, the traction head forming die is located at the second end of the reducing cavity, and the power device drives the traction head forming die to move horizontally to pull out the aluminum alloy bar; through plastic deformation and cooling solidification in the reducing cavity, internal defects such as shrinkage porosity of the aluminum alloy are eliminated, grains are refined, and the structure is more compact and uniform; the traction force is improved through tight connection of the traction head and the bar, and the stability of the continuous casting process is enhanced; and the traction rate is accurately adjusted by the power device, so that the aluminum alloy bar which is compact in structure and small and uniform in grain size can be obtained.

The invention belongs to the field of target material preparation, and discloses a barium-titanium-doped indium oxide target material and a preparation method thereof. Comprising the following steps: mixing barium oxide powder, titanium oxide powder, indium oxide powder, a dispersing agent, a binder and deionized water, and then carrying out ball milling to obtain slurry I; the mass ratio of the barium oxide powder to the titanium oxide powder to the indium oxide powder is (10-20): (10-20): (60-80); drying, screening and calcining the slurry I to obtain powder I; mixing the powder I, titanium oxide powder, a dispersing agent, a binder and deionized water to obtain a mixture, carrying out ball milling to obtain slurry II, drying, and screening to obtain powder II; adding a binder into the powder material II, granulating, and screening to obtain powder material III; carrying out compression molding by taking the powder III as a raw material to obtain a target blank; and sequentially carrying out degreasing heat treatment, sintering heat treatment and cooling on the target blank to obtain the barium-titanium-doped indium oxide target material. The preparation method can be used for preparing the barium-titanium-doped indium oxide target material with uniform and compact crystal grains.

The invention discloses an aluminum alloy for preparing a traction beam of an external bogie of a train and a preparation method of the aluminum alloy, and belongs to the technical field of alloys for high-speed trains. The aluminum alloy contains Zn, Mg, Cu, Zr, Ti, Mn, Ni, La and other elements, and lanthanum can refine grains, improve the metallographic structure and form a dispersion strengthening phase, so that the strength and toughness of the alloy are improved; the nickel and the aluminum element can form a solid solution, so that the alloy structure is more compact, and the obtained aluminum alloy shows higher resistance when bearing external force and is not prone to deformation or fracture. According to the method, the aluminum alloy is manufactured through two-step superplastic die forging, after two-step die forging, plastic deformation of the alloy is uniform, the grain size is small and uniform, mechanical properties of the aluminum alloy are improved, the aluminum alloy particularly has good fatigue performance, and the aluminum alloy has good safety and reliability while light weight of the aluminum alloy is guaranteed.

The application provides a benzamide bromide-modified perovskite solar cell and a preparation method thereof, and belongs to the technical field of perovskite solar cells; the application solves the problem of low photoelectric conversion rate and poor stability of existing perovskite solar cells caused by uncoordinated lead ions; the application comprises the following steps: S1, placing a substrate covered with a transparent metal electrode into deionized water, acetone and ethanol for ultrasonic cleaning in sequence, and then drying and treating by ultraviolet ozone to form a conductive substrate; S2, spin coating an electron transport layer on the conductive substrate; S3, spin coating and depositing a perovskite active layer on the surface of the electron transport layer, wherein the perovskite active layer uses benzamide bromide as a passivation agent; S4, spin coating a hole transport material on the surface of the perovskite active layer to obtain a hole transport layer; and S5, evaporating a metal electrode on the hole transport layer; the application is applied to perovskite solar cells.

The present invention mainly relates to an ecological slope protection method based on a soft soil substrate, wherein the soft soil substrate comprises a main material and an auxiliary material, wherein the main material comprises soft soil, and the auxiliary material comprises rice husk ash, fly ash, palm oil fuel ash, polypropylene fiber, sucrase and fruit peel enzyme. The construction process of the present invention is as follows: a soft soil substrate made of a soft soil curing agent is applied to a traditional bare slope, wherein the soft soil curing agent comprises fly ash, rice husk ash and palm oil fuel ash, and polypropylene fiber and sucrase are added after being mixed with the soft soil. After that, the slope surface needs to be repaired and leveled, a small amount of soil layer gap is excavated on the slope surface, and the gap is filled with a soft soil curing substrate that has been prepared in a good proportion, and covered with a layer of geogrid to complete the construction of the slope protection substrate. The present invention can not only effectively recycle fly ash, rice husk ash and palm oil fuel ash, but also reduce environmental pollution, and improve the poor stability of the substrate and the poor soil in the ecological slope protection.