Ceramic PCB has the advantages of high heat dissipation, high insulation, low expansion coefficient, corrosion resistance, etc., and is widely used in aerospace, automotive electronics, smart lighting, biomedical, and 5G interconnection. In recent years, more and more products use ceramic PCB, according to the relevant data survey: the global ceramic substrate market size reached 1.13 billion U.S. dollars in 2022, and is expected to reach 4.15 billion U.S. dollars in 2029, with a compound annual growth rate of 18.23%.
Ceramic PCB production process many people still do not know, then we will give you a detailed introduction to the production process of ceramic PCB and manufacturing process, to help you better understand the ceramic PCB.
What is ceramic PCB?
Ceramic PCB is a ceramic-based printed circuit board, using thermally conductive ceramic powder and organic binder preparation, thermal conductivity of 9-20W/m. Ceramic PCB has excellent electrical insulation properties, high thermal conductivity, excellent soft brazing and high adhesion strength, and can be etched like PCB boards can be a variety of graphics, has a large current-carrying capacity. In high-power power electronic circuit structure technology and interconnection technology, ceramic PCB has become the basic material.
What are the processes of ceramic PCB?
1.direct copper plating ceramic substrate process
DPC substrate has the advantages of high graphic accuracy, vertical interconnection, etc., mainly used in high-power packaging.
2.direct bonding process of copper ceramic substrate
The DBC line layer is thicker, better heat resistant, mainly used in high power, high temperature variations of the IGBT package.
3.thick film printing ceramic substrate process
TPC thick ceramic substrate heat resistance, low cost, but poor line layer accuracy, mainly used in automotive sensors and other fields.
4.thin film ceramic substrate process
In the plane ceramic substrate, thin film ceramic substrate TFC substrate graphic accuracy, but the metal layer is thin, mainly used in small current optoelectronic device packaging.
5. AMB active brazing process
The AMB substrate line layer is thicker, better heat resistance, mainly used in high power, large temperature variations of the IGBT package.
6.multilayer htcc high temperature co-firing process
High temperature co-fired ceramic materials are mainly alumina, mullite and aluminum nitride as the main components of ceramics. HTCC ceramic powder does not join the glass material. Conductor slurry uses materials for tungsten, molybdenum, molybdenum, manganese and other high melting point metal heat resistant slurry. Sintering temperature of 1600 ° ~ 1800 °.
7. multilayer ltcc low temperature co-firing process
Low temperature co-fired ceramics to ensure that the low temperature co-firing conditions have a high sintering density, usually added to the amorphous glass component, crystallized glass, low melting point oxides to promote sintering. Glass and ceramic composites are typical low-temperature co-fired ceramic materials. Sintering temperature 900 ° ~ 1000 °, LTCC using high conductivity and low melting point of Au, Ag, Cu and other metals as a conductor material, is mainly used in high-frequency wireless communications, aerospace, memory, drivers, filters, sensors, and automotive electronics and other fields.
Production Process of Ceramic PCB
Ceramic PCB board is a high-performance circuit board with excellent thermal conductivity, high temperature resistance and corrosion resistance. It is widely used in high-end electronic products. The following is a detailed introduction to the production process of ceramic PCB.
1. Raw material preparation
First of all, you need to prepare the raw materials needed to make ceramic PCB boards, including ceramic powder, organic binder, additives and metal wires.
2. Board processing
After mixing ceramic powder with organic binder, ceramic plates are made by pressing and molding. Metal wires or other conductive materials are then attached to the plate and fine-tuned and cut to conform to design requirements.
Holes are punched into ceramic plates, usually by laser drilling or mechanical drilling. This step requires great care to ensure that the holes are in the correct position.
4. Graphicization of the inner circuit
Inner circuit patterning refers to the conversion of the designed circuit pattern into an actual circuit layout. This step is usually performed using photolithography, wherein the circuit pattern is printed on the inner layer of the ceramic board by photolithography.
After completing the patterning of the inner layer circuit, metallization is required. This step includes copper etching and gold plating operations to ensure that the circuit board has good conductive properties.
6. Outer layer circuit patterning
Outer layer circuit patterning refers to the design of the external circuit layout . The actual circuit layout of this step is usually similar to the inner layer circuit patterning photolithography.
7. Soldering and Assembly
After completion of the outer layer of circuit patterning, the need for soldering and assembly operations. This step includes patching, plug-in, connector and other operations to ensure that the entire electronic product has good functional performance.
8. Testing and inspection
After the completion of the ceramic PCB board, you need to carry out testing and inspection operations. This step usually includes appearance inspection, functional testing, voltage testing, high temperature testing and other aspects to ensure that the product meets the design requirements and has stable and reliable performance.
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