7results about How to "Maintain good performance" patented technology

The invention provides an aluminum-vanadium-niobium-chromium intermediate alloy as well as a preparation method and application thereof. The aluminum-vanadium-niobium-chromium intermediate alloy comprises the following components in percentage by mass: 15%-22% of V, 1%-7% of Nb, 5%-11% of Cr and the balance of Al and inevitable impurities. The preparation method of the aluminum-vanadium-niobium-chromium intermediate alloy comprises the following steps: firstly, respectively preparing three binary intermediate alloys, namely primary alloys, by utilizing an aluminothermic reduction method; then, the primary alloy is refined through vacuum induction melting, and a secondary alloy is obtained; and finally, the secondary alloy and metal aluminum are subjected to vacuum induction melting, and the aluminum-vanadium-niobium-chromium intermediate alloy is prepared. The aluminum-vanadium-niobium-chromium intermediate alloy has the advantages of being uniform in component, low in element segregation and low in impurity content, and has very good application prospects and large-scale industrial popularization potential in the field of titanium alloy production through the additive manufacturing technology.

The invention provides self-leveling dry-mixed mortar and application. The self-leveling dry-mixed mortar is prepared from the following components in parts by weight: 378 to 399 parts of cement, 81 to 85.5 parts of coal ash, 81 to 85.5 parts of modified waste bentonite cat litter, 756 to 798 parts of fine aggregate, 27 to 27.8 parts of waste bentonite cat litter filter residue powder and 17.6 to 18.8 parts of additive. The treated waste bentonite cat litter is used in the self-leveling dry-mixed mortar, so that the self-leveling dry-mixed mortar has longer setting time and better water-retaining property, the problems of'fast drying 'and'water loss' caused by tropical monsoon climate are solved, and meanwhile, the waste bentonite cat litter is fully utilized.

The invention relates to a gradient composite coating for a copper-based part, the gradient composite coating is of a double-layer structure and comprises a nickel-based alloy transition layer and a copper-based alloy surface layer, and an anodic oxidation layer is arranged between the nickel-based alloy transition layer and the copper-based alloy surface layer; and the surface of the nickel-based alloy transition layer is subjected to roughening treatment through an anodic oxidation method, and an anodic oxidation layer is formed. And meanwhile, the mechanical property of the formed composite coating with the gradient structure can be decreased progressively through process improvement, so that the stress ratio balance between a matrix part and a surface cladding layer is guaranteed, the defects such as cracks are effectively prevented, and the metallurgical coating has excellent strength and comprehensive mechanical property.

The present application relates to the technical field of building material recycling, and more particularly to a red mud-based high-performance concrete curb and a preparation method thereof. The curb is prepared from a red mud-based cementitious material, sand, stone, water, a color agent and an additive through a certain preparation method, realizes high-value resource utilization of solid waste such as red mud, improves the performance of the red mud-based concrete curb, is green and environmentally friendly, has a simple preparation process, low cost, high economic benefits, and is suitable for popularization and application.

The present application discloses a pneumatic jig and method for snapping the paper cone of a speaker. The jig includes: an adjustment bracket; a cylinder, which is height-adjustably mounted on the adjustment bracket; a vibration device, which is connected to the cylinder; a positioning jig, which is arranged below the vibration motor and is used to fix the speaker assembly; wherein the cylinder is used to drive the vibration device to move downward to contact the paper cone of the speaker assembly, and the vibration device is used to generate vibration to achieve the vibration of the paper cone of the speaker, thereby completing the process of snapping the paper cone of the speaker. The present application realizes the automated operation of snapping the paper cone of the speaker, which can ensure the penetration effect of the glue in the center of the paper cone of the speaker, ensure the effectiveness, stability and consistency of the snapping paper cone of the speaker, and ensure the excellent performance of the speaker product.

The present invention relates to the field of lead-acid batteries, and in particular to a narrow labyrinth structure of a battery that can prevent tipping and acid leakage. The narrow labyrinth structure is used between the middle cover and the upper cover of the battery, and includes a labyrinth surface, an exhaust passage, and an exhaust chamber. The labyrinth surface is arranged on the middle cover, the labyrinth surface is an inclined surface, the end of the labyrinth surface facing the acid return port is the lower end, the exhaust passage is located at the end of the labyrinth surface away from the acid return port, the exhaust passage is connected to the exhaust chamber, and a ventilation gap is provided at the position of the upper cover corresponding to the exhaust passage, and the bottom surface height of the exhaust chamber is higher than the bottom surface height of the exhaust passage. It also relates to a battery that can prevent tipping and acid leakage. The exhaust chamber of the present invention is independently arranged relative to the labyrinth surface, avoiding the problems of direct discharge of acid mist and leakage of acid liquid after the battery tipping over, thereby making the use of the battery safer and more reliable, and at the same time making the battery less likely to lose water. With the continuous use of the battery, the battery is better kept with a rich electrolyte, thereby improving the service life of the battery.

The present invention proposes a method for preparing a ceramic shell for casting, which relates to the field of casting technology. The preparation method comprises the following steps: S1, preparing a mold for molding; S2, covering the mold with a casting film, and closely attaching the casting film to the surface of the mold by negative pressure suction; S3, printing on the surface of the mold after coating, evenly spreading a ceramic slurry with self-hardening properties on the mold, and hardening while printing; S4, when the ceramic slurry closely covers the surface of the mold and completely hardens into a ceramic layer, the ceramic layer is removed from the mold to obtain a ceramic shell. The method for preparing a ceramic shell for casting disclosed by the present invention realizes the manufacture of a shell with high precision and high surface quality by combining ceramic slurry printing with V-method casting, and has high efficiency, economy and wide applicability.