Magnetic Molding via Ferrite Alignment in Silicone
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing permanently-magnetic moldings using polymeric support materials do not efficiently achieve high magnetic flux density and homogeneous magnetic field distribution, particularly when using silicon caoutchouc as the base material.
Innovation Solution
A method involving the mixing of silicon caoutchouc with high-energy ferrite particles and subsequent hot-vulcanization in a mold cavity under a static magnetic field, allowing for the alignment and magnetization of the filler materials within the polymer matrix, thereby achieving high magnetic flux density and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If magnetic filler materials are introduced at high fill rate into polymeric support material, then productivity and manufacturing simplicity are improved, but magnetic flux density and field distribution uniformity are insufficient
Solution Approach 1:
The patent applies parameter changes by utilizing the phase transition of silicon caoutchouc from liquid to solid during hot-vulcanization. The liquid state allows magnetic filler particles to be freely distributed and aligned under magnetic field, while the solid state after vulcanization locks this uniform distribution, achieving both high productivity and superior magnetic field uniformity
Solution Approach 2:
The patent creates a composite material system combining silicon caoutchouc with specific magnetic filler materials (ferrite, magnetite, or iron oxide) at optimized ratios. This composite approach enables the material to simultaneously achieve ease of processing, high magnetic flux density, and homogeneous field distribution
2Ease of manufacture
If conventional embedding methods are used with polymeric support materials, then ease of manufacture is improved, but magnetic flux density and homogeneous field distribution are not achieved
Solution Approach 1:
The patent changes the processing parameters by employing hot-vulcanization at specific temperature ranges (150-250°C) with controlled timing. This allows the silicon caoutchouc to remain processable during molding while achieving final curing after magnetization, thereby simplifying manufacturing while ensuring high magnetic field uniformity
Solution Approach 2:
The patent applies preliminary action by introducing and aligning magnetic filler particles in the liquid state before final solidification. The magnetic field is applied during the liquid phase when particles can move freely, ensuring uniform distribution before the material sets, thus achieving high precision with simple subsequent processing
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 method results in permanently-magnetic moldings with high magnetic flux density and uniform field distribution, suitable for applications under high temperature loads, expanding the use of polymeric support materials in previously inaccessible areas.
Implementation Method 1
during cross-linking a static magnetic field is created in the mold cavity and the magnetic filler materials are magnetized and/or aligned in the silicon caoutchouc being cross-linked
Implementation Method 2
the starting material, which is mixed with the magnetic filler material and homogenized, is introduced into a mold cavity by a temperature-regulated screw and is cross-linked by vulcanization in the mold cavity by the application of heat
Data Source
AI summary
A method for producing a permanently-magnetic part, made from a polymeric support material filled with magnetic filler materials on the basis of silicon caoutchouc, hot-vulcanized from at least one starting material, in which the at least one starting material of the silicon caoutchouc is mixed prior to vulcanization with 50 to 95% by weight of high energy ferrite particles of a density of 5.0 to 5.2 g/cm3 and an average particle size of 1.5 to 2.5 μm as the magnetic filler material and is homogenized. Subsequently, the homogenized mixture is introduced into a mold cavity by a temperature-regulated screw and is cross-linked by vulcanization in the mold cavity by the application of heat for forming the molding, wherein during cross-linking a static magnetic field is applied to the mold cavity and the magnetic filler materials are magnetized and aligned in the silicon caoutchouc being cross-linked.