Overview
Metal sealed feedthroughs are critical components in systems requiring hermetic isolation, such as vacuum chambers, reactors, or medical implants. They consist of conductive pins or tubes embedded within a metal-ceramic or metal-glass matrix, ensuring zero leakage even under extreme temperatures or pressures. Developed initially for aerospace and nuclear applications, these feedthroughs now serve industries like semiconductor manufacturing, where ultra-high vacuum (UHV) compatibility is essential. Their robust construction prevents outgassing and contamination, making them ideal for sensitive environments.
Structure and Working Principle
A typical metal sealed feedthrough comprises three parts: a metal flange (e.g., stainless steel), insulating material (e.g., alumina ceramic), and conductive elements (pins or capillaries). The assembly is brazed or glass-sealed to create a permanent, leak-tight bond. During operation, the feedthrough maintains a barrier between two environments (e.g., vacuum and atmosphere) while allowing electrical currents, RF signals, or fluids to pass. Advanced designs may integrate multiple pins or coaxial configurations for high-frequency applications.
Key Features
1. **Hermeticity**: Leak rates as low as <10^-9 mbar·L/s ensure integrity in UHV systems. 2. **Durability**: Withstands temperatures from -200°C to +1000°C, depending on materials. 3. **Customizability**: Available in various shapes, sizes, and conductor arrangements (e.g., single/multi-pin, coaxial). Specialized versions include feedthroughs for high-voltage (up to 100 kV) or aggressive media (e.g., corrosive gases), often featuring gold plating or exotic alloys like Inconel.
Application Areas
- **Semiconductor**: Chip fabrication equipment (etching, CVD chambers). - **Energy**: Nuclear reactors, fusion research devices. - **Medical**: MRI machines, implantable devices. - **Aerospace**: Satellite propulsion systems, sensors. In these fields, feedthroughs enable critical functions like sensor data transmission, power delivery, or coolant transfer without compromising system isolation.
Maintenance and Precautions
To prolong lifespan, avoid mechanical shocks or thermal cycling beyond rated limits. Regular leak testing (e.g., helium mass spectrometry) is recommended for high-value systems. For cleaning, use non-abrasive solvents compatible with the feedthrough materials. Never disassemble sealed units; replace them if integrity is compromised. Storage should be in dry, contaminant-free environments.
B2B Procurement Guide
When sourcing metal sealed feedthroughs, specify: 1. **Operating conditions**: Pressure, temperature, and media. 2. **Electrical requirements**: Voltage, current, and signal type. 3. **Certifications**: MIL-STD-883 for aerospace or ISO 13485 for medical use. Lead times for custom designs may extend to 8–12 weeks. Bulk orders (50+ units) often qualify for 10–20% discounts. Verify suppliers' hermetic testing capabilities and request documented leak-rate reports.
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