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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.
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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.
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