95% Alumina Metallized Ceramic
Products Description
Within the internal structure of a high-voltage DC contactor, the 95% Alumina Metallized Ceramic component performs the following key functions:
1. High-Voltage Insulation and Isolation
Effectively isolates high-voltage zones during contact opening and closing, preventing risks such as arc breakdown and electrical short circuits.
2. Structural Support Core
Serves as the internal load-bearing framework, ensuring the contact system maintains geometric stability under conditions of high mechanical shock and thermal cycling.
3. Hermetic and Vacuum Sealing Interface
Provides a stable sealing surface in partially sealed designs or arc-extinguishing chamber structures, maintaining the stability of the internal gas or vacuum environment.
4. Substrate for Metal-to-Ceramic Interconnection
Facilitates a reliable connection between the ceramic and the metal housing or electrodes via the metallized layer, addressing issues arising from differences in coefficients of thermal expansion.
Application Advantage: Comprehensive coverage of the smart, low-carbon industry chain
New Energy Vehicles (BEV/PHEV)
Al2O3 Alumina Ceramic Vacuum Relay Casing serves as a core arc-extinguishing chamber component for main circuit breakers and fast-charging circuit contactors.
Stationary Energy Storage Systems (BESS)
Functions as a high-voltage DC disconnector within centralized control cabinets for large-capacity battery clusters.
Megawatt-scale DC Charging Piles
High Precision Alumina Ceramic Components act as a core insulating component for DC output protection relays inside smart supercharging piles.
Detail Showcase: Insights into Micro-level Surface Finish and Structural Integrity
Glaze-grade surface finish
Non-metallized ceramic insulation areas exhibit a uniform ivory-white luster and extremely low surface roughness. This design serves not only aesthetic purposes but also prevents the accumulation of dust caused by high-voltage static electricity and the formation of conductive water films in humid environments, thereby maintaining long-term surface insulation resistance.
Definition of metallized edges
Under microscopic examination, the boundary between metallized and 95% Alumina Mn Mo Metallized Ceramic areas appears sharp and distinct, free from "burrs" or "fringing" caused by paste bleeding. This precise coating boundary ensures that the specified internal creepage distances are preserved, meeting rigorous IEC insulation standards.
Defect-free brazing interface
Cross-sectional analysis of the brazed ceramic-to-metal assembly under a metallographic microscope reveals a continuous, robust solder layer free of voids or cold joints. This flawless interface provides the physical foundation for withstanding thermal stress and ensuring zero helium leakage.
Technical Features: Balancing Hermeticity and Thermal Management
| High Hermeticity | The leak rate at the ceramic-to-metal seal is well below 10⁻⁸ Pa·m³/s. This near-vacuum-grade seal allows the contactor interior to be filled with high-pressure arc-quenching gases (such as H₂ or N₂ mixtures), thereby significantly reducing product size and enhancing breaking capacity. |
| Excellent Thermal Conductivity | Although Metallized Alumina Ceramics Relay Parts are electrical insulators, alumina possesses notable thermal conductivity (approximately 20–30 W/m·K). It acts as a heat sink, rapidly conducting the transient heat generated during contact interruption to the housing for dissipation, thereby preventing excessive internal temperature rises that could burn out the coil. |
| Thermal Shock Stability | New energy vehicles experience drastic temperature fluctuations during operation. Through specialized microstructural engineering, our High Voltage Relay Machining Metallized Alumina Ceramics components can withstand thermal shocks-such as rapid temperature spikes from -40°C to 150°C-without cracking, ensuring reliability in extreme climates. |
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Metallized Alumina Relay Ceramics is not only a ceramic structural part, but also a core basic component in the HVDC high-voltage DC contactor to achieve the coordinated work of insulation safety, structural support, and reliable sealing. Its material system and metallization process together constitute an important guarantee for the stable operation of new energy high-voltage systems.
If you are undertaking an HVDC contactor or high-voltage DC system development project, we can provide customized engineering solutions and stable batch supply support based on your structural drawings and system requirements to ensure the long-term engineering performance of the overall system in terms of safety and reliability.
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