FeCo35 Alloy for High Saturation Magnetization
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Solution Overview
Problem
Existing soft magnetic materials face challenges in achieving optimal performance due to the need for careful temperature control during processing to maintain high saturation magnetization (Bsat) and permeability, which can be costly and environmentally detrimental, especially with high cobalt content alloys like FeCo50, and require additional elements that may compromise magnetic properties.
Innovation Solution
A metal alloy composition of approximately 35 wt% cobalt and 65 wt% iron (FeCo35) is processed using powder metallurgy, such as metal injection molding, to achieve high Bsat without the need for additional elements, allowing for controlled phase transitions and reduced cobalt usage, resulting in articles with enhanced magnetic properties and reduced processing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high cobalt content alloys like FeCo50 are used to achieve high saturation magnetization, then magnetic performance is improved, but processing costs increase and environmental impact worsens
Solution Approach 1:
The patent changes the compositional parameters by reducing cobalt content from 50 wt% to 35 wt% while adjusting iron content to 65 wt%, achieving high saturation magnetization with reduced environmental harm and cost
Solution Approach 2:
The patent utilizes controlled phase transitions during processing to achieve the desired microstructure and magnetic properties without requiring high cobalt content, leveraging thermodynamic phase changes to optimize performance
2Reliability
If careful temperature control is implemented during processing to maintain high saturation magnetization, then magnetic performance is improved, but processing complexity and cost increase
Solution Approach 1:
The patent changes the compositional parameters to FeCo35, which inherently provides high saturation magnetization without requiring complex temperature control protocols during processing
3Reliability
If high cobalt content is used to achieve high saturation magnetization, then magnetic performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the compositional parameters by reducing cobalt content to 35 wt% while maintaining high saturation magnetization, thereby reducing material cost without sacrificing magnetic performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The FeCo35 alloy achieves higher Bsat than other iron cobalt alloys with reduced cobalt content, eliminating the need for additional elements and minimizing environmental impact, while allowing for varied shapes and cost-effective production through controlled phase transitions during processing.
Implementation Method 1
cooling the sintered alloy at a rate sufficient that the alloy is substantially arranged in an ordered body-centered cubic phase
Implementation Method 2
The magnetic component can be configured to interact with an electric circuit to produce an electromotive force
Data Source
AI summary
A component for an electronic device can include a metal alloy formed by a metal injection molding process. The metal alloy can have a composition of about 32 wt % to about 38 wt % cobalt and about 62 wt % to about 68 wt % iron.