5results about How to "Reduce crack formation" patented technology

The invention discloses a 3D printing spray head for printing an emergency horizontal barrier of a polluted site, a reinforcing line assembly and a reinforcing net assembly are mounted on a spray head shell, and a reinforcing net and a reinforcing line can be synchronously arranged on the top and the side face of a printing belt in the horizontal barrier strip printing process to form a composite barrier. The forming quality of the barrier is improved, pollutant transport is effectively controlled or pollutant exposure ways are blocked, and efficient emergency disposal of sudden soil environment pollution events is achieved. The 3D printing nozzle comprises a nozzle shell, a discharging forming opening located in the bottom end of the nozzle shell, a reinforcing line assembly and a reinforcing net assembly, wherein the reinforcing line assembly and the reinforcing net assembly are located on the outer side of the nozzle shell. The reinforcing line assembly is connected with one side face of the nozzle shell, and the reinforcing net assembly is connected with the front face of the nozzle shell. During working, a printing belt forming a horizontal barrier flows out of the discharging forming opening.

The invention relates to a heteronuclear composite zinc negative electrode material based on in-situ construction of a zeolite imidazate skeleton, and a preparation method and application thereof. The composite zinc negative electrode material takes a zinc-based material as a carrier, and a zeolite imidazate skeleton interface layer taking various different transition metals as centers is constructed on the surface in situ. The zeolite imidazate framework interface layer is formed by mutually connecting a plurality of different transition metals and organic ligands through self-assembly, the transition metals are taken as the center, the organic ligands and the transition metals are bridged, and the zeolite imidazate framework interface layer is made of a crystalline porous material. And immersing the zinc-based material into a mixed solution of the transition metal salt solution and the organic ligand solution, oscillating, washing and drying to obtain the composite zinc negative electrode material. Compared with the prior art, the preparation method has the advantages of good interface compatibility, good electrochemical stability, excellent electrochemical performance and the like.

The application relates to the technical field of battery positive electrode materials, in particular to a synergistically modified high-voltage positive electrode material and a preparation method and application thereof, which comprises a bulk particle, a doped layer coated on the surface of the bulk particle and a coating layer coated on the surface of the doped layer; the bulk particle comprises lithium nickel cobalt manganese oxide; the doped layer is lithium nickel cobalt manganese oxide doped with fluorine elements in a bulk phase; and the coating layer comprises a lithium fluoride coating layer and lithium nickel cobalt manganese titanium oxide particles embedded in the lithium fluoride coating layer. The preparation method comprises the following steps: firstly, a nickel cobalt manganese hydroxide precursor is prepared by adopting a coprecipitation method; then, a doped layer and a coating layer are synthesized on the surface of the nickel cobalt manganese hydroxide precursor by adopting a solvothermal method; finally, calcination treatment is carried out to obtain the synergistically modified high-voltage positive electrode material. The synergistic modification strategy of bulk phase doping and surface coating effectively guarantees the stability of the interface and bulk structure, the preparation process is simple, and the electrochemical performance of the positive electrode material under high voltage, high cycle, high rate or high-temperature environment is improved.

The invention belongs to the technical field of high-temperature alloy, and discloses a ferronickel-based high-temperature alloy material and an aging treatment method thereof.The aging treatment method comprises the steps that ferronickel-based high-temperature alloy is heated to 150-250 DEG C higher than the gamma'dissolution temperature, then heat preservation is conducted for 0.5-3.0 h, and rapid cooling is conducted after heat preservation is completed; wherein the temperature rise rate of heating is 5-20 DEG C / min. The nickel-iron-based high-temperature alloy is heated to the temperature 80-200 DEG C higher than the gamma'dissolving temperature, then heat preservation is conducted for 0.5-3.0 h, air cooling is conducted for 2-5 min after heat preservation is completed, then rapid cooling is conducted, and aging treatment is completed; wherein the temperature rise rate of heating is 5-20 DEG C / min. According to the method, a main strengthening phase part in the ferronickel-based high-temperature alloy is separated out in a cooling control mode, so that the ferronickel-based high-temperature alloy is in an under-aging state, and the problem that an existing high-alloying-degree high-temperature alloy material is high in strength but difficult to deform can be solved.

The invention discloses a preparation method of cellulose / nano-zinc oxide composite aerogel, and belongs to the field of functional materials. The preparation method comprises the following steps: modifying nano zinc oxide with a silane coupling agent, and dissolving cellulose in a pre-cooled aqueous solution of sodium hydroxide and urea to obtain a cellulose solution; adding the modified nano-zinc oxide particles into a cellulose solution in a stirring state to obtain a cellulose / nano-zinc oxide mixed solution, then performing directional freezing, replacing the formed gel with ethanol, and washing with deionized water to remove redundant solvent until the pH value is equal to 7 to obtain the cellulose / nano-zinc oxide composite hydrogel. And drying in a freeze dryer to obtain the cellulose / nano-zinc oxide composite aerogel. The interior of the prepared aerogel has an orderly-arranged directional pore structure, and the aerogel has the advantages of being good in mechanical property, hydrophobic property and heat-insulating property.