Factor 1
Match Glass Transition Temperature (Tg) to peak operating condition.
If the ambient or motor operating temperature exceeds the adhesive's Tg, shear strength drops dramatically, leading to magnet detachment.
magnet bonding adhesive tool
Adhesive Bonding Magnet Selector
Select the optimal adhesive bonding magnet solution based on your operating temperature, manufacturing constraints, and substrate type. Ensure your magnetic assembly meets reliability goals.
Screening Result
Enter your application constraints to see the recommended adhesive family and risks.
Adhesive Bonding Magnet Engineering Report
A successful adhesive bonding magnet application depends on understanding the chemical compatibility, joint design, and environmental stresses. Magnet bonding adhesive requires rigorous pre-production testing to confirm shear load margins.
Factor 2
Surface preparation determines ultimate bond strength.
Magnets often have plating like Ni-Cu-Ni. Plasma treating or specific primers are frequently required to prevent delamination.
Factor 3
Cure process impacts manufacturing throughput.
While structural epoxy offers the highest strength, it requires heat curing which increases cycle time. Fast-cure acrylics are preferred for high volume if strength allows.
Factor 4
Hybrid retention is critical for high-speed rotors.
Adhesive alone is often not enough for high RPM electric vehicle motors. A combination of bonding and a retention sleeve or mechanical lock is standard.
Stress Visualization
Joint Design Rules
- Maximize Shear: Design the joint so loads are carried in shear or compression, never peel.
- Control Gap: Maintain a consistent bond gap (e.g., 0.1mm - 0.2mm) using fixturing or glass beads in the adhesive.
- Surface Prep: Plated magnets (Ni-Cu-Ni) are smooth. Improve mechanical interlocking with scuffing or plasma treatment if acceptable.
- Thermal Match: NdFeB magnets and steel have different coefficients of thermal expansion (CTE). Use toughened adhesives to absorb the mismatch.