Layered Nd-Fe-B Magnet Structure for Crack-Resistant 3D Printing
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Solution Overview
Problem
Existing methods for manufacturing permanent magnets, such as rare earth magnets, face challenges in enhancing mechanical properties and alleviating stresses that can lead to cracking, while maintaining magnetic performance.
Innovation Solution
The development of a permanent magnet incorporating a magnetic phase and a buffer segment composed of specific alloys, such as nickel, iron, and chromium, along with a method of additive manufacturing that involves layering magnetic and buffer alloy powders to form stratified segments, which improves mechanical properties and reduces stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional manufacturing methods are used for permanent magnets, then production process is simple, but mechanical properties are poor and cracking occurs
Solution Approach 1:
The magnet is divided into multiple layers with alternating magnetic and non-magnetic segments. The non-magnetic segments act as buffer zones that accommodate thermal expansion differences and reduce stress concentration, thereby preventing cracks while maintaining manufacturing feasibility through layer-by-layer additive processing
Solution Approach 2:
The invention uses composite structures combining magnetic materials (e.g., NdFeB) with non-magnetic buffer materials (e.g., nickel, copper, or aluminum alloys). This composite approach leverages the high magnetic performance of the magnetic phase while the non-magnetic phase provides mechanical flexibility and stress relief, resolving the contradiction between strength and process complexity
2Reliability
If buffer segments are added to improve mechanical properties, then cracking is reduced, but device complexity increases
Solution Approach 1:
The buffer segments are strategically placed at specific locations within the magnet structure where stress concentration is most likely to occur. This segmented approach provides crack resistance only where needed, rather than requiring buffer material throughout the entire structure, thus limiting the increase in device complexity
Solution Approach 2:
The non-magnetic buffer segments are positioned locally at interfaces between magnetic layers or at geometric features prone to stress concentration. This localized application of buffer material provides crack resistance precisely where required, minimizing the overall structural complexity while maximizing reliability
3Strength
If additive manufacturing with multiple powder mixtures is used, then mechanical properties improve, but manufacturing complexity increases
Solution Approach 1:
The additive manufacturing process uses separate powder mixtures for magnetic and non-magnetic segments, allowing each material type to be optimized independently. The layer-by-layer deposition process automatically manages the complexity by building the composite structure through repeated cycles of magnetic layer deposition followed by buffer layer deposition
Solution Approach 2:
The invention controls the composition, thickness, and distribution parameters of each layer to optimize mechanical properties. By adjusting parameters such as buffer layer thickness, magnetic phase content, and layer orientation, the manufacturing process manages complexity through parameter optimization rather than process redesign
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 solution effectively enhances the mechanical properties and performance of the magnetic phase, preventing cracking and achieving superior magnetic characteristics through the strategic use of buffer segments in the additive manufacturing process.
Implementation Method 1
additively manufacturing a first and second layer disposed upon one another
Implementation Method 2
method of additive manufacturing that involves layering magnetic and buffer alloy powders
Implementation Method 3
alleviating stresses that can lead to cracking
Data Source
AI summary
A permanent magnet formed by additively manufacturing magnetic phases and buffer phases is disclosed. The buffer phase(s) may improve performance, enhance mechanical properties and allow the magnet to better tolerate stresses such that defects such as cracking do not occur or are less likely to occur. The buffer phase may be a magnetic or non-magnetic material.