95% Alumina Metallized Ceramic Parts Custom High-precision Alumina Metallized Ceramic Components

Alumina metallized ceramic components are precision ceramic components built on an alumina (Al₂O₃) ceramic substrate. A dense, durable metal layer (such as the molybdenum-manganese (Mo-Mn) method, gold plating, or nickel plating) is formed on the surface through a specific process, enabling brazing, sealing, or use as conductive electrodes with metal parts.

Their core value lies in retaining the excellent properties of alumina ceramic (insulation, high-temperature resistance, high hardness, and low expansion) while also possessing the weldability, electrical conductivity, and high thermal conductivity of metal.

Alumina metallized ceramic components serve as a bridge between the ceramic and metal worlds. They address the contradiction between insulation and conductivity, as well as the difficulties of ceramic-metal connections, in high-performance electronic and mechanical systems.

These components combine the advantages of both ceramics and metals:

1. Excellent insulation and sealing:
The alumina substrate is an excellent insulator, and the metallized layer and ceramic are metallurgically bonded to form a hermetic seal, preventing leakage and internal contamination.

2. Excellent Thermal Performance:

• High-Temperature Resistance: Alumina itself is heat-resistant. After metallization, it can be brazed to form a strong bond with metal at high temperatures, allowing the entire component to operate for long periods in high-temperature environments.
• Matched Coefficient of Thermal Expansion (CTE): By selecting an appropriate metallization formulation (such as molybdenum-manganese), the CTE of the metallization layer can be closely matched to that of the alumina ceramic. This prevents cracking at the bonding interface due to excessive stress during drastic temperature fluctuations, resulting in excellent thermal shock resistance.

3. High Mechanical Strength and Reliability:
The metallization layer has a high bond strength to the ceramic substrate (typically greater than 70 MPa), which can withstand significant mechanical and thermal stresses, ensuring a reliable connection and a long service life.

4. Excellent Electrical Conductivity and Solderability:

• Where electrical current is required, the metallization layer provides a conductive path (such as circuit conductors or electrodes).
• The metallized surface can be brazed (such as with silver-copper solder or gold-based solder) to the metal housing or leads, forming a strong mechanical and electrical connection.

Alumina metallized ceramic components serve as connectors and functional carriers in high-end manufacturing, primarily used in the following applications:
1. Electronic and microwave devices (core applications).
Microwave tubes (magnetrons, traveling wave tubes, klystrons), laser and LED packaging, and RF modules.

2. Power electronics and semiconductors.
Thyristors and IGBT modules are used as insulating substrates, high-voltage vacuum switches, and vacuum capacitors.

3. Aerospace and defense.
High-reliability sensor housings, windows, or mirror mounts on spacecraft (brazed with a metallized frame to achieve a high-strength, thermal shock-resistant sealed connection).

4. Industrial and medical.

• High-power laser focusing heads: The ceramic components used to secure and cool optical elements often require metallization for welding and cooling.
• Implantable medical devices: For example, sealed feedthroughs for pacemakers.
• High-temperature sensor protective covers: Metallization allows for smooth welding and encapsulation with metal tubes.