Effect of alloy substituents on soft magnetic properties and economics of Fe-based and Co-based alloys

Abstract

Amorphous and nanocrystalline soft magnetic alloys have garnered interests in academia and industry due to their potentials for applications, such as power transformers, electric motors, and sensors. To achieve good glass formability, thermal stability, and prevent grain overgrowth, elements such as B, Nb, Ta, and Hf are used in many soft magnetic systems. However, the high price of these precursors results in expensive soft magnetic alloys. Herein, we report on substituting Ta and Hf with TaC and HfC, respectively, to significantly reduce the cost of Fe-based FINEMET and Co-based HTX005 alloys. Soft magnetic properties of these alloys are studied. The effect of thermal annealing and strain annealing on TaC and HfC substituted alloys are also investigated. Lastly, we discuss the cost analysis on these alloys. Using the synthesis route presented here, a cost reduction of up to 74% can be achieved.

Finite element analysis modeling of high voltage and frequency 3-phase solid state transformers enabled by metal amorphous nanocomposites

“…Increasingly, issues of materials criticality and economics 54 are important in materials choices for applications. Co is not currently on recent materials criticality lists, but it has been in the past and its potential criticality and cost 55 should be considered in component designs. In the benchmarks presented herein, the Fe-Ni-based MANCs compare favorably with Co-based MANCs on a cost per weight basis.…”

“…Kurniawan et al 55 and Aronhime et al 18 have reported the individual prices of the precursors used in the synthesis of their compositions. Among the late transition metals, Co is the most expensive at $60/kg, while Fe is the least expensive at only $0.39/kg.…”

Study on soft magnetic properties of Finemet‐type nanocrystalline alloys with Mo substituting for Nb

“…In a number of studies, Nb was substituted by other elements such as V, Cr, Mo, etc. . In the literature , Silveyra et al studied Fe 73.5 Si 13.5 B 9 Nb 3− x Mo x Cu 1 ( x = 1.5, 2, at.%) alloys annealed at a fixed temperature and time by Mossbauer spectrum method.…”