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NEWS | What is Ceramic Metallization?
I. What is Ceramic Metallization?
Ceramic metallization is a key technology that involves forming a conductive metal layer on the surface of a ceramic substrate, enabling it to conduct electricity, be soldered, and be packaged. Because ceramic materials themselves possess high insulation and high-temperature resistance, direct electrical connections are not possible. Through metallization processes, ceramics can be applied to high-end electronics and semiconductor fields.
II. Why is Ceramic Metallization Necessary?
Advantages of Ceramic Materials: High insulation, high heat resistance, high mechanical strength, and excellent heat dissipation.
However, their limitations: They cannot conduct electricity directly and cannot be soldered. Therefore, metallization processes are required to enable ceramics to be used in: power modules (IGBT/SiC), semiconductor equipment, vacuum connectors, LED heat sinks, and aerospace hermetically sealed components.
III. Common Ceramic Materials
1. Alumina (Al₂O₃): Low cost, widely used in general electronic and automotive electronic products.
2. Aluminum Nitride (AlN): High thermal conductivity (170–200 W/mK), suitable for high-power applications.
3. Silicon Nitride (Si₃N₄): High strength and impact resistance, the preferred material for military, aerospace, and automotive electronics.
4. Silicon Carbide (SiC): High temperature resistance and high thermal conductivity, with micro-conductivity, used in next-generation power devices and third-generation semiconductors.
IV. Mainstream Ceramic Metallization and Circuit Fabrication Processes:
1. Thick Film Process: A conductive layer is formed by screen printing metal paste and high-temperature sintering.
Advantages: Low cost, suitable for mass production.
Disadvantages: Lower precision.
2. Thin Film Process (DPC, also known as Direct Plated Copper): High-precision circuits are formed using sputtering, electroplating, and lithography techniques.
Advantages: Suitable for high-precision, high-resolution, and high-frequency applications, LED, 5G, and optical communication applications.
Disadvantages: Higher cost.
3. Direct Bonded Copper (DBC): Copper foil is directly bonded to ceramic to form a high thermal conductivity substrate.
Features: High current carrying capacity and standard process for power module IGBTs.
4. Active Metal Brazing (AMB): High-strength bonding using active metals.
Features: High reliability and suitable for automotive and aerospace applications.
V. Process Comparison
VI. Main Application Areas:
Semiconductor Industry: Ceramic parts for wafer equipment, vacuum chamber components and parts.
Automotive Electronics: IGBT modules, electric vehicle control systems.
Optoelectronics Industry: LED heat dissipation substrates, optical communication components.
Aerospace Industry: High-reliability and hermetic sealing components.
VII. Key Quality Factors:
Key factors affecting the quality of ceramic metallization include: metal adhesion, coefficient of thermal expansion (CTE) matching, surface roughness control, metal layer thickness uniformity, and hermetic sealing.
VIII. How to Choose the Appropriate Manufacturing Process?
High-power applications → DBC / AMB
High-precision circuits → DPC / Thin film
Cost-oriented products → Thick film
IX. Conclusion
Ceramic metallization is a core technology connecting ceramic materials and electronic systems, widely used in semiconductors, automotive electronics, and high-power modules.
With the development of industries such as electric vehicles, high-frequency communications, optical communications, and AI, the demand for high thermal conductivity and high reliability ceramic substrates will continue to grow.
Contact Us Now (CTA)
If you are looking for high-quality ceramic metallization and ceramic substrate solutions, please contact Tensky International:
✔ DPC / DBC / AMB Process Integration
✔ Precision Ceramic Machining
✔ Customized Design and Mass Production
Contact us now at sales@tensky.com.tw for professional technical support and a quote.
