US 12,367,995 B2
Methods for preparing magnetostrictive powder and magnetostrictive coating
Gongtian Shen, Beijing (CN); Qingli Qi, Beijing (CN); Yang Zheng, Beijing (CN); Yilin Yuan, Beijing (CN); and Qingchuan Pan, Beijing (CN)
Assigned to China Special Equipment Inspection and Research Institute, Beijing (CN)
Filed by China Special Equipment Inspection and Research Institute, Beijing (CN)
Filed on Jan. 13, 2023, as Appl. No. 18/097,110.
Claims priority of application No. 202210188476.7 (CN), filed on Feb. 28, 2022.
Prior Publication US 2023/0274866 A1, Aug. 31, 2023
Int. Cl. H01F 1/153 (2006.01); B05D 1/02 (2006.01); G01N 29/24 (2006.01)
CPC H01F 1/1535 (2013.01) [B05D 1/02 (2013.01); G01N 29/2412 (2013.01); G01N 2291/0231 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method for preparing magnetostrictive powder, comprising:
putting metals for preparing the magnetostrictive powder into a vacuum melting furnace to be melted into a solution, wherein the putting metals for preparing magnetostrictive powder into a vacuum melting furnace to be melted into a solution comprises putting iron and one or more metals selected from the group consisting of gallium, cobalt, aluminum, and nickel into a vacuum smelting furnace to be melted into an alloy solution;
keeping a temperature of the alloy solution at 350° C. above a melting point of the alloy solution for 10 to 30 minutes; and
atomizing the solution into fine droplets by ultrasonic atomization, so that the fine droplets are cooled and solidified into magnetostrictive powder, wherein the atomizing the solution into fine droplets by ultrasonic atomization comprises:
outputting high-frequency electric energy with an ultrasonic generator in an atomization furnace, so that a crystal transducer at the bottom of a cavity of the atomization furnace generates ultrasonic sound energy;
pouring the solution into the atomization furnace, wherein the sound energy vibrates a sound-transparent film at the bottom of the atomization furnace to act on the liquid in the atomization furnace, which destroys a surface tension and inertia of molten metals; and
impacting a liquid metal flow formed by the solution with an airflow with a frequency of 85 kHz to 95 kHz and a velocity of 2.2 Mach to 2.4 Mach by ultrasonic atomization, so that the molten metals are broken and atomized into fine droplets, wherein particle sizes of the magnetostrictive powder are 15 μm to 22 μm, and an average particle size of the magnetostrictive powder is 20 μm.