Due to increasingly multiple functions, miniaturization and high speed of electronic devices and upsizing of IC, more rigorous requirement has to be set to ceramic PCBs in terms of CTE, thermal conductivity, loss, dielectric constant and tape resistance. It can be estimated that ceramic PCBs will be increasingly more called for with aluminum nitride, mullite and glass ceramic as substrate material.

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What Are the Applications of Ceramic PCB?

Multi-layer interconnect board

To be compatible with miniaturization of electronic products, ceramic PCBs are able to hold more components within the same board area, which adds more possibilities for ceramic PCBs in the applications of multi-layer interconnect board.

Digital PCB

AGC Company from Japan took advantage of LTCC PCBs to produce analog/digital PCB boards so that parasitic capacitance can be reduced by approximately nine tenths. It not only effectively overcomes crosstalk interference of circuit tracing, but also reduces volume and weight of circuit.

Why is ceramic PCB so popular?

High Thermal Expansion

The first reason why ceramic boards are so popular in the electronics sector is their excellent thermal coefficient expansion. It is good to note that the ceramic base heat transmission almost matches silicon and can act as a connection material. Besides, you can use it as an isolator. Therefore, there is maximum use for the thermal properties of ceramic boards, even in adverse conditions.

Stability

The application of ceramic brings a stable dielectric capacity, and you can modify the balance into a partial radiofrequency loss to increase your device's power. Still, despite the surface toughness, ceramic materials come with an inherent resistance against chemical erosion. Ceramic's chemical resistance can change to resistance against liquids and moisture.

Versatility

You can create several use cases to integrate a metal core board with a high thermal expansion. Besides, you can still turn the metal core into reliable conductors using the sintering technique. Therefore, the application of ceramic PCB is beneficial because of its high processing temperatures.

Durability

The ceramic board fabrication process creates durability through the use of unique properties, such as toughness. That prevents your PCB from wear and tear. So you can be confident that you will not change your PCB soon because of its slow aging capacity. Also, the high thermal resistance of ceramic PCB makes it assume a decelerated decomposition process.

Adaptability

Lastly, the use of metal cores can serve as inflexible carriers that offer mechanical stiffness. This property makes it easier to use ceramic PCBs in any state of matter because of the high resistance to corrosion and normal wear and tear.

What are the main types of ceramic PCB?

The ceramic PCBs are classified into three types based on the manufacturing process.

·  High Temperature Ceramic PCB

·  Low Temperature Ceramic PCB

·  Thick Film Ceramic PCB

High Temperature Ceramic Printed Circuit Boards

This type of PCB is designed for high temperatures and is sometimes referred to as a high temperature co-fired ceramic (HTCC) circuit. These circuit boards are manufactured in a unique manner. To create new ceramics the process combines solvent, plasticizer, adhesive, aluminum oxide, and lubricant.

Once the new ceramic has been developed, it is coated, and circuit tracing on molybdenum or tungsten metals is applied. Following this, the circuits will be baked between 1600 and 1700 degrees Celsius for approximately 48 hours after lamination. The baking will take place in a specific gaseous environment that will include hydrogen gas.

Low Temperature Ceramic Printed Circuit Boards

This type of PCB is designed for low temperatures and is sometimes referred to as a low temperature co-fired ceramic (LTTC) circuit. The low-temperature ceramic PCB manufacturing process differs from the high-temperature or HTCC type. The adhesive substance and crystal glass are used to make the low-temperature ceramic PCB. Both of these materials are applied to a metal sheet with gold paste. Following this, the board will be cut and laminated. Finally, the circuit will be kept at 900 degrees Celsius in a gaseous oven.

The low-temperature ceramic PCB has better shrink tolerance and less warpage. In summary, LTTC will have higher thermal conductivity and mechanical intensity than other types, including HTCCs. The thermal advantage of the low-temperature PCB makes it preferable when working with heat-free products such as LED lights.

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