Metallized Ceramics
Middia Ceramic metalization refers to firmly adhering a thin layer of metal film to the surface of ceramics, enabling a bonding between ceramics and metals.
There are various ceramic metalization processes available, such as the molybdenum-manganese method, gold plating method, copper plating method, tin plating method, nickel plating method, LAP method (laser-assisted plating), and others.
Note: Can be customized according to customer needs
—— Metallized Ceramics Introduction ——
Metallized Ceramics Introduction
Metallized ceramics – Ceramic substrate
Before metallizing and sealing ceramics, the fired ceramic pieces should undergo specific treatments according to certain requirements.
This is to achieve the criteria of having no burrs or protrusions around the edges, and ensuring the ceramic surfaces are smooth and clean. After metallization and sealing, it is required that there are no silver layer spots along the periphery of the ceramic piece’s thickness.
Metallized ceramics – substrate
The structure consists of a ceramic substrate (1),
a metal layer (copper layer (2), gold layer (3), nickel layer (4),
a photoresist layer (5), and circuits (6).
Its characteristic lies in the ceramic substrate having multiple layers of metal and covered circuits.
The manufacturing process of this product includes ultrasonic cleaning, sintering, infrared heating pretreatment, automatic printing, metallization sintering, electroplating, and nickel plating, among others.
Metalized Ceramics – Steps
The steps for ceramic metallization are as follows:
1. Cleaning by boiling/washing
2. Application of the metalization coating
3. First-stage metallization (sintering in a high-temperature hydrogen atmosphere)
4. Nickel plating
5. Welding
6. Leakage testing
7. Inspection
Principles of ceramic metallization
The surfaces of ceramic materials differ from those of metal materials, often making it challenging for welding to wet the ceramic surface or form a strong bond. As a result, the bonding between ceramics and metals requires a special technique known as metallization. This method involves firmly adhering a thin layer of metal film onto the ceramic surface, enabling the welding of ceramics and metals. Additionally, a specially formulated glass solder can directly achieve welding between ceramics and metals.
Metallization and sealing of ceramics involve coating the working surface of ceramic components with a highly conductive, firmly bonded metal film used as an electrode. The primary process for joining ceramics and metals together using this method involves the following steps:
1. Metallization of the ceramic surface through pyrolysis.
2. Deposition of a metal film.
3. Heating the solder to seal the ceramic and metal together.
Currently, the use of silver electrodes is prevalent both domestically and internationally. The overall silver coating process involves several stages:
– Evaporation and decomposition of the bonding agent (90 to 325℃).
– Reduction of silver carbonate or silver oxide (410 to 600℃).
– Transformation of the auxiliary solvent into a colloid (520 to 600℃).
– Firm bonding of metallic silver to the product surface (above 600℃).
Applications:
- Ceramic Feed-through insulators,
- Ceramic Headers,
- Ceramic High-power receptacles,
- Ceramic Insulating discs,
- Ceramic Insulator rings and cylinders,
- Ceramic Precipitator products,
- Ceramic Power switches,
- Ceramic Traveling wave tubes,
- Ceramic Vacuum interrupters,
- Ceramic components for Windows,
- Ceramic Power grid tubes,
- X-ray Ceramic tubes