Electrophoretic Deposition of Permanent Magnets With Minimal Waste
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for manufacturing permanent magnets result in significant waste and energy loss, particularly for small magnets, due to subtractive machining and the use of bonding agents in bonded magnets, which also compromise coercivity and energy density.
Innovation Solution
The use of electrophoretic deposition (EPD) to form magnets by adding magnetic anisotropic particles to an EPD chamber and applying a voltage differential to create an electric field for deposition, followed by sintering, allowing for near-net shape production with minimal waste and preservation of coercivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional subtractive machining methods are used to manufacture permanent magnets, then manufacturing precision can be achieved, but significant material waste occurs
Solution Approach 1:
The patent inverts the conventional manufacturing approach by using additive manufacturing (electrophoretic deposition) instead of subtractive machining. Magnetic particles are deposited layer-by-layer to build the magnet directly in its final shape, eliminating the need for subsequent material removal and achieving near-net-shape production with minimal waste.
Solution Approach 2:
The patent changes the manufacturing parameters from mechanical subtractive processes to electrochemical additive deposition. By controlling electrical parameters (voltage, current, deposition time) and chemical parameters (particle concentration, pH, additives), precise control over magnet geometry and microstructure is achieved, maintaining manufacturing precision while eliminating material waste.
2Ease of manufacture
If bonded magnets are used to reduce manufacturing complexity, then ease of manufacture improves, but coercivity and energy density are compromised due to bonding agents
Solution Approach 1:
The patent extracts and eliminates the bonding agent component from the magnet structure. By using electrophoretic deposition, magnetic particles are directly bonded to each other through electrostatic forces and sintering, removing the need for separate bonding agents that would otherwise dilute the magnetic phase and reduce coercivity and energy density.
Solution Approach 2:
The patent creates a composite structure where magnetic particles are densely packed and directly bonded without organic binders. The composite consists essentially of magnetic phase material with minimal non-magnetic content, achieving both ease of manufacture through direct deposition and high coercivity through the absence of magnetically inactive bonding agents.
3Reliability
If sintering temperature is increased to improve magnet density, then magnetic properties are enhanced, but energy consumption increases
Solution Approach 1:
The patent performs preliminary alignment of magnetic particles during the electrophoretic deposition process itself. By applying a magnetic field during deposition, particles are oriented in the desired direction before sintering, eliminating the need for high-temperature magnetic field applications that would otherwise be required to achieve proper magnetic anisotropy. This preliminary action reduces the energy required during subsequent processing.
Solution Approach 2:
The patent changes the sintering parameters by using lower temperatures combined with extended deposition times or optimized particle packing during electrophoretic deposition. The pre-aligned and densely packed particle structure from controlled deposition allows achieving target density and magnetic properties at reduced sintering temperatures, thereby lowering energy consumption while maintaining 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
This method enables the production of magnets with reduced waste and enhanced coercivity, achieving high energy product values while minimizing material loss and maintaining magnetic properties, suitable for high-temperature applications.
Implementation Method 1
adding a plurality of first particles having magnetic anisotropy to an electrophoretic deposition (EPD) chamber and applying a voltage differential across electrodes of the EPD chamber to create an electric field in the EPD chamber for causing electrophoretic deposition of the first particles above a first of the electrodes
Implementation Method 2
sintering the formed structure to form a magnet
Data Source
AI summary
A method of forming a magnet includes forming a structure by electrophoretic deposition (EPD), and after forming the structure, sintering the formed structure to form a magnet. The forming the structure by EPD includes adding a plurality of first particles having magnetic anisotropy to an EPD chamber and applying a voltage differential across electrodes of the EPD chamber to create an electric field in the EPD chamber for causing electrophoretic deposition of the first particles above a first of the electrodes for forming a first layer comprising the first particles.