4 results about "Carbothermic reaction" patented technology

The invention provides a preparation method of flaky aluminum nitride, which comprises the following steps: a paste preparation process: mixing and dispersing nano aluminum oxide powder, modified cellulose and an organic solvent to obtain pre-dispersed paste; a carbon-containing porous body preparation step for obtaining a carbon-containing porous body by subjecting the pre-dispersed paste to a first heat treatment; a carbon thermal reduction step of performing carbon thermal reduction treatment on the carbon-containing porous body in a nitrogen atmosphere to obtain carbon-containing aluminum nitride; and a decarburization process: performing decarburization treatment on the carbon-containing aluminum nitride to obtain sheet-shaped aluminum nitride. The nano aluminum oxide powder, the modified cellulose and the organic solvent are prepared into the paste, and the flaky aluminum nitride can be prepared on a large scale with a simple process flow and relatively low cost through gradual carbonization and carbon thermal reaction.

The application relates to the field of sodium ion batteries, and discloses a preparation method of hierarchical porous Fe7S8 / nitrogen-doped carbon composite nanowires and application thereof. The application takes NTA as a metal ion chelating agent, chelates zinc ions and iron ions through a solvothermal reaction, and prepares a ZnFe-NTA precursor; the precursor is pyrolyzed at high temperature under an inert atmosphere, metal ion reduction is induced through a carbon thermal reaction, low-boiling-point zinc particles are volatilized, nitrogen-doped carbon formed through in-situ conversion of an organic ligand is combined, and a hierarchical porous structure is generated; finally, a gas-phase sulfuration method is adopted to form Fe7S8, and the hierarchical porous Fe7S8 / nitrogen-doped carbon composite nanowires are obtained. When the composite nanowires are used as a negative electrode of a sodium ion battery, the hierarchical porous structure can effectively promote full infiltration of electrolyte and rapid migration of sodium ions, and can improve cycle stability and rate performance.

The invention discloses a reaction device for preparing NiP binary alloy through carbon thermal rapid reduction, and relates to the field of carbon thermal reduction devices.The reaction device comprises a reaction tank, a feeding pipeline is arranged in the reaction tank and distributed on the inner circle of the reaction tank by a circle in a spiral structure, the upper end of the feeding pipeline communicates with a feeding pipeline, and the lower end of the feeding pipeline communicates with a discharging pipeline; a feeding main pipe is arranged on the feeding pipeline and is used for being connected with a material pump for pumping a mixture into the reaction tank. The feeding pipeline is of a spiral structure, a mixture is preheated along the spiral channel before entering the reaction tank, the carbon thermal reaction efficiency is further improved, the mixing degree of the mixture can be improved, the silicon carbide rod heating plate is adopted, the temperature in the reaction tank can be rapidly increased to 800 DEG C, and the reaction time is remarkably shortened.

This invention provides a method for preparing flake-shaped aluminum nitride. The method includes: a paste-making step, in which nano-alumina powder, modified cellulose, and an organic solvent are mixed and dispersed to obtain a pre-dispersed paste; a carbon-containing porous body preparation step, in which the pre-dispersed paste is subjected to a first heat treatment to obtain a carbon-containing porous body; a carbothermal reduction step, in which the carbon-containing porous body is subjected to carbothermal reduction treatment under a nitrogen atmosphere to obtain carbon-containing aluminum nitride; and a decarburization step, in which the carbon-containing aluminum nitride is decarburized to obtain flake-shaped aluminum nitride. By preparing nano-alumina powder, modified cellulose, and an organic solvent into a paste, and through stepwise carbonization and carbothermal reaction, flake-shaped aluminum nitride can be prepared on a large scale, with a simple process flow and low cost.