Ceramic-to-Metal Sealing Materials:
| Housing Material | Insulator | Conductor |
| NiFe Alloys & NiFeCO (Kovar) |
94%-99% Al2O3 | Kovar ; Copper Cored Kovar |
| 300 & 400 Series SST | AlN | 52 Alloy |
| Inconel | Stainless Steels | |
| 42, 46, 49 Alloys |
Hermetic Seal Properties:
- Hermeticity: up to 1×10-9 atm cc/sec He
- Working Temperature > 500°C depending on materials and geometry
- Insulation Resistance: Typically exceeds 1 GΩ @ 100 VDC
Ceramic-to-Metal Sealing Features:
- High Abrasion Resistance
- High Mechanical Strength
- Pressures over 10,000 PSI
- High Temperature Usage
- Low Dielectric Loss
- Mass Spectrometer Leak Tested
- High Chemical Stability
Ceramic-to-Metal Welding Process:
- Cleaning
- Pasting
- Metallizing
- Nickel Plating
- Mounting
- Brazing
- Inspection&Packing
Ceramic-to-Metal Sealing Applications:
- Relay Insulators
- Capacitor
- Magnetrons
- Travelling Wave Tube
- X-ray Tube Components
- Electrosurgical Instrumentation
- Implantable Packages and Feedthroughs
- Gas Detectors
- Microscopes (TEM, SEM)
- High Voltage Feedthroughs
- High-temperature Feedthroughs
- RF Feedthroughs
- Optoelectronics and Power Tube
- Laser Tubes
- Thyristors
- Diodes
- And etc
Declaration: This is an original article of INNOVACERA®. Please indicate the source link when reprinting: https://www.innovacera.com/product/ceramic-to-metal-sealing-2
Frequently Asked Questions
Facing vacuum leakage issues? How does a custom ceramic-to-metal seal manufacturer ensure reliability?
Vacuum leaks usually result from mismatched thermal expansion or poor joint bonding. As an experienced manufacturer, INNOVACERA utilizes advanced metallizing and vacuum brazing techniques with materials like Kovar, Inconel, and 94%–99% Al2O3. Every assembly undergoes 100% mass spectrometer helium leak testing, achieving a hermeticity level down to 1×10⁻⁹ atm cc/sec He to withstand working pressures over 10,000 PSI and harsh environments.
Operating under extreme temperatures and high voltages? What performance standards can these assemblies meet?
Ceramic-to-metal sealing assemblies operate stably at continuous temperatures exceeding 500°C while offering an insulation resistance of >1 GΩ @ 100 VDC. Combining high dielectric strength with low dielectric loss, they are engineered to maintain hermetic integrity in high-voltage feedthroughs, RF tubes, and implantable medical packages without electrical breakdown.
