Yttrium ferrite powder with high near-infrared reflectivity and preparation method thereof

Abstract

The invention relates to a yttrium ferrite powder with high near-infrared reflectivity and a preparation method thereof. Its technical scheme is: by yttrium nitrate hexahydrate: iron nitrate nonahydrate: monohydrate citric acid: the ratio of the amount of substance of ethylene glycol is 1: 1: (2~8): (2~8), the described Yttrium nitrate hexahydrate, the ferric nitrate nonahydrate, citric acid monohydrate and ethylene glycol are mixed to obtain a mixture. Grinding the mixed material at room temperature for 30-120 min, and then drying at 100-110° C. to obtain a precursor of yttrium ferrite. Grinding the yttrium ferrite precursor for 10 to 15 minutes to obtain a grinding material, putting the grinding material into a corundum crucible, and then placing the corundum crucible in a muffle furnace at a rate of 3 to 5°C / min Raise the temperature to 800-1000°C, keep it warm for 3-5 hours, and cool with the furnace to obtain yttrium ferrite powder with high near-infrared reflectivity. The invention has the characteristics of simple process, low equipment requirement, short production cycle and suitability for industrialized production, and the manufactured product has high near-infrared reflectivity.

Description

technical field [0001] The invention belongs to the technical field of yttrium ferrite powder. In particular, it relates to a high near-infrared reflectance yttrium ferrite powder and a preparation method thereof. Background technique [0002] At high temperatures above 900 °C, the heat transfer mechanism is dominated by radiation heat transfer. Thermal radiation under high temperature conditions is mainly concentrated in the infrared short-wave region. Therefore, powders with good near-infrared reflection properties can be used in thermal insulation coatings as functional fillers. Thermal insulation coatings are applied to the lining surface of high-temperature furnaces, and their prospects are promising. [0003] Yttrium ferrite has both ferroelectricity and weak ferromagnetism, and can be used in multi-state memory as a multiferroic material. Weak ferromagnetism and special magneto-optical effect make it have broad application prospects in the fields of magneto-optic s...

AI Technical Summary

Problems solved by technology

[0004] At present, the methods for preparing yttrium ferrite powder include: "Microwave preparation method of yttrium ferrite nano-powder" (CN102173459A) patented technology, although this technology makes yttrium ferrite nano-powder under microwave conditions, but the equipment requirements Higher; "A preparation method of yttrium ferrite powder" (CN105540677A) patented technology, which uses urea, citric acid monohydrate, ethylenediaminetetraacetic acid or hydrazine as a reducing agent, at a controlled temperature of 200 to 800 ° C Combustion synthesis reaction is used to produce yttrium ferrite powder. This technology needs to dissolve the raw materials in deionized water to obtain a solution and then carry out subsequent reactions. The process is relatively complicated and the production cycle is long.

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