Metalized Ceramic Alumina Insulator
Products Description
A Metalized Ceramic Alumina Insulator is not merely a standard ceramic insulating component; rather, it is a composite structural part that achieves a hermetic ceramic-to-metal bond through active metalization or the sintering of Mo/Mn paste. In HVDC contactors, these insulators typically take the form of cylinders, flanges, or discs with central through-holes. One end is brazed to the metal moving or stationary contact terminals, while the other interfaces with the housing or the epoxy resin potting area, thereby fulfilling three critical functions: high-voltage insulation, hermetic sealing of the vacuum or resin-filled chamber, and mechanical positioning.
Product Advantages
A metallurgical bond is achieved between the ceramic substrate and the metallized layer, resulting in interface bond strength far superior to that of physical spraying or electroplating metallization processes for DC Relay Elements Metallized Ceramics.
The integral structure contains no organic components, ensuring freedom from outgassing, aging, or deformation during long-term exposure to high temperatures (up to 180°C).
Insulation performance remains stable across the full temperature range of -40°C to 180°C for Aluminum Oxide Metallized Ceramics, avoiding the sudden drops in insulation resistance often seen with plastic insulation components.
Customized, non-standard geometries can be designed to fit the internal space constraints of contactors, delivering superior insulation, voltage withstand, and sealing performance within a compact footprint for Mo-Mn Alumina Metallized Industrial Ceramic.
precautions for product use
Powder Preparation: High-purity alumina powder (Al₂O₃ content ≥95%) is mixed with additives (such as silicon oxide, strontium carbonate, and kaolin) in precise proportions and ball-milled to produce a uniform granulated powder.
Forming: Depending on the geometric shape of the insulating Customized Alumina Ceramic, dry pressing, isostatic pressing, or injection molding is employed to shape the granulated powder into a ceramic green body. Isostatic pressing is suitable for complex 3D structures, ensuring uniform green body density and minimal internal stress.
Sintering: The green body of DC Relay Elements Metallized Ceramics undergoes pre-sintering at approximately 1300°C to enhance strength, followed by densification sintering at high temperatures (1450–1550°C) to form a dense alumina ceramic matrix with a bulk density of 3.7–3.9 g/cm³.
Metallization Layer Preparation: A molybdenum-manganese paste is applied to designated areas of the Aluminum Oxide Metallized Ceramics surface via screen printing (325–400 mesh). A stable metallization layer is formed through pre-firing at 850°C followed by high-temperature co-firing at 1450–1550°C in a hydrogen atmosphere.
Application Areas
| High-voltage DC relays for new energy vehicles | Mo-Mn Alumina Metallized Industrial Ceramic is used in high-voltage circuit control scenarios-such as main battery pack relays, pre-charge relays, and fast-charging relays-requiring high voltage withstand capability, reliable arc suppression, and excellent environmental adaptability. |
| DC contactors for energy storage systems | Customized Alumina Ceramic is used for DC-side disconnection and isolation in Power Conversion Systems (PCS); it must withstand wide temperature ranges and frequent operational cycles. |
| DC-side protection for PV inverters | DC Relay Elements Metallized Ceramics is used for high-voltage DC isolation and switching control following PV array combining; it requires high standards for insulation voltage withstand and weather resistance. |
contact us
To obtain full performance specifications for the metallized alumina ceramic insulator, selection guidelines based on high-voltage contactor operating conditions, samples, and bulk pricing, please contact our technical team; we can also provide comprehensive test reports covering hermeticity and withstand voltage.
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