Influence of a Protective Coating on the Crystallization of an Amorphous Fe78Si13B9 Alloy

Abstract

The effect of free volume on the crystallization of amorphous Fe78Si13B9 ribbons was studied using ultrasonic and thermal treatments. To maintain free volume under heating, amorphous samples were coated with a special protective Ta coating. It has been shown via X-ray diffraction that the fraction of the crystalline phase in the annealed coated amorphous ribbons is higher than in the corresponding uncoated samples. The use of ultrasonic treatment and the application of a protective coating lead to the formation of a larger proportion of the crystalline phase during annealing. Differences in crystallization kinetics are discussed under the assumption that the concentration of free volume in amorphous samples affects their crystallization, as well as the role of the Ta coating preventing the release of free volume to the surface during heat treatment.

The Effect of a Coating on the Crystallization of Multicomponent Co-Based Amorphous Alloys

“…The results obtained (an increase in the nanocrystal fraction in the coated sample) confirm the effectiveness of using a protective coating to maintain the free volume and increase the fraction of the nanocrystalline component in the structure. This increase in the fraction of the nanocrystalline phase in the samples with a protective coating agrees with the previously obtained data for Al 87 Ni 8 Gd 5 [71] and Fe 78 Si 13 B 9 [73].…”

Crystallography and Applications of Metallic Materials

“…Regarding crystallography, there are many scientific studies that analyze the crystallization process (including nucleation) of these alloys. In the published work, the influence of a protective coating on the crystallization of a Fe-Si-B alloy was analyzed Contribution (10). It was a Ta coating that prevents the release of the free volume to the surface during heat treatment.…”

Effects of Stress on Loss and Magnetic Properties of Fe80Co3Si3B10P1C3 Amorphous Iron Cores

“…Amorphous alloy iron cores require impregnation and curing with materials such as epoxy resin to enhance their overall integrity when subjected to external forces. However, during the curing process, the volume of the binder typically decreases, and the various soft magnetic properties of the iron core may change due to the stress generated by the shrinkage of the binder volume [25][26][27]. The volume of the binder typically decreases during the curing process, so the shape of the wound iron core sample will have slight deformation, and the outer diameter size will decrease by 0.05-0.1%.…”