A method for preparing spherical and sheet-like CrF3-3H2O micro / nano powders and their crystal transformation.

CN119176581BActive Publication Date: 2026-05-26LANZHOU INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LANZHOU INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
Filing Date
2024-10-17
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing methods for preparing CrF3·3H2O micro/nano powders are complex and require harsh reaction conditions, making it difficult to obtain micro/nano-scale powders with uniform morphology and controllable size. Furthermore, polycrystalline materials have insufficient performance in some applications, while amorphous materials are more advantageous, but there is a lack of simple and efficient preparation methods and crystal transformation pathways.

Method used

Spherical or sheet-like CrF3·3H2O micro/nano powders were prepared by reacting Cr2AlB2 with hydrofluoric acid, and their crystal transformation, including the conversion between amorphous and polycrystalline states, was achieved by controlling heat treatment, thereby regulating the crystallization state of the material.

Benefits of technology

Obtaining CrF3·3H2O micro/nano powders with uniform morphology and narrow particle size distribution improves the specific surface area and flowability of the material, making it suitable for high-performance coatings, catalysts, and lubricants, and enhancing catalytic activity and tribological properties.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure FT_1
    Figure FT_1
  • Figure FT_2
    Figure FT_2
  • Figure FT_3
    Figure FT_3
Patent Text Reader

Abstract

This invention provides a method for preparing spherical and sheet-like CrF3·3H2O micro / nano powders and their crystalline transformation. An HF acid solution is slowly added to Cr2AlB2 powder, and the mixture is stirred at 25-40°C for 4-20 h; the HF acid solution has a mass fraction of 20-45%. After the reaction, the resulting solution is washed successively with deionized water and anhydrous ethanol by centrifugation until neutral. The precipitate is then freeze-dried to obtain spherical CrF3·3H2O powder, which is then ultrasonically treated in an ethanol solution to fully expand and form a two-dimensional sheet-like material. This invention prepares spherical CrF3·3H2O micro / nano powders based on the selective etching reaction of hydrofluoric acid on Cr2AlB2. By adjusting the reaction conditions, CrF3·3H2O micro / nano powders with uniform morphology and narrow particle size distribution can be obtained, and the crystalline transformation of CrF3·3H2O can be achieved through heat treatment.
Need to check novelty before this filing date? Find Prior Art