Sm-Fe-N Magnet Composition for Low-Sm Saturation Magnetization
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Solution Overview
Problem
The Sm—Fe—N-based magnetic materials face challenges in maintaining saturation magnetization when the usage amount of Sm is reduced, as existing methods do not effectively suppress the decrease in saturation magnetization within practical use ranges.
Innovation Solution
The Sm—Fe—N-based magnetic material and manufacturing method involve substituting part of Sm with La and/or Ce, and optionally substituting Fe with Co and/or Ni, to set the lattice volume of the main phase within a predetermined range, thereby improving or maintaining saturation magnetization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the usage amount of Sm is reduced to lower cost, then the cost decreases, but the saturation magnetization deteriorates
Solution Approach 1:
The patent changes the lattice volume parameter of the Sm-Fe-N phase by substituting Sm with La and/or Ce, and optionally substituting Fe with Co and/or Ni. By controlling the lattice volume within a specific range (0.833-0.840 nm³), the saturation magnetization is maintained or improved even when Sm content is reduced. This parameter optimization allows cost reduction through lower Sm usage while preserving magnetic performance.
Solution Approach 2:
The patent creates a composite magnetic material system by combining multiple rare earth elements (Sm, La, Ce, and optionally other rare earths) and transition metals (Fe, Co, Ni, and optionally other metals). This composite approach allows the beneficial magnetic properties of Sm to be combined with the lattice structure modulation effects of La and Ce, while Fe, Co, and Ni substitutions further tune the magnetic characteristics, achieving cost-effective high-performance magnets.
2Reliability
If the lattice volume is adjusted by substituting elements, then the saturation magnetization is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent establishes specific compositional ranges for substitutions (x+y+z between 0.04-0.50, p+q between 0-0.10, s between 0-0.10) that directly control the lattice volume parameter. These quantified parameter ranges provide clear manufacturing guidelines, transforming the complex substitution process into a systematic parameter optimization task that is easier to control and reproduce in production.
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
This approach allows for improved saturation magnetization even when the Sm usage is reduced, ensuring the magnetic properties remain within practical use ranges by adjusting the lattice volume and composition of the Sm—Fe—N-based magnetic material.
Implementation Method 1
nitriding the magnetic material precursor
Data Source
AI summary
An Sm—Fe—N-based magnetic material according to the present disclosure includes a main phase having a predetermined crystal structure. The main phase has a composition represented by (Sm(1-x-y-z)LaxCeyR1z)2(Fe(1-p-q-s)CopNiqMs)17Nh (where, R1 is predetermined rare earth elements and the like, M is predetermined elements and the like, and 0.04≤x+y≤0.50, 0≤z≤0.10, 0≤p+q≤0.10, 0≤s≤0.10, and 2.9≤h≤3.1 are satisfied). A crystal volume of the main phase is 0.833 nm3 to 0.840 nm3. A manufacturing method of the Sm—Fe—N-based magnetic material according to the present disclosure includes nitriding a magnetic material precursor including a crystal phase having a composition represented by (Sm(1-x-y-z)LaxCeyR1z)2(Fe(1-p-q-s)CopNiqMs)17.