You can create high-temperature co-firing by concocting aluminum oxide, plasticizer, lubricant, and solvent. Then it would help if you perform roll forming, the curtain covering, and circuit tracing on refractory surfaces, such as tungsten. After that, cut and laminate your PCB, put it in a high-temperature oven of 16000C- 17000C, and bake for 32-48 hours.
Remember to bake in a minimized gas, like hydrogen, to avoid oxidizing tungsten and molybdenum.
You can use ceramic circuit boards produced under high-temperature co-firing on small-scale PCBs and carrier circuits. It is impossible to use these methods in large-scale PCBs because of their low shrinking lenience, warpage, and moderately high tracing opposition of surfaces.
Low-Temperature Co-fired Ceramic (LTCC) Circuit Board
You can fabricate LTCC PCBs by mixing crystal glass, composite glass, and non-glass adhesive materials. Then it would help if you carried out sheet generation and circuit tracing with a highly conductive gold paste.
LTCC creates a conduit to metal paste for circuit tracing. Besides, you can complete circuit board baking by making some changes to the thick film pasting. Also, you can improve the product accuracy and shrinking capacity of your board.
Thick Film Ceramic PCB
You can repeat a thick layer of gold paste on print on your ceramic base. However, you should bake the layers at a temperature below 10000C. While this fabrication strategy is ideal for large-scale ceramic circuit board production, its use is limited because of the high gold prices. Alternatively, you can create a multi-layered, highly concentrated copper circuit board. That is the most common ceramic circuit board in the PCB manufacturing industry right now.
Remember to bake your ceramic board in nitrogen gas to prevent the oxidation of copper. Apart from that, the dielectric paste produced by nitrogen gas is an essential ingredient of this technology.
Ceramic PCB Properties
Unlike standard boards that contain substrates made of epoxy glass fiber, polystyrene, and others, ceramic panels have unique properties that make them stand out from the rest. These properties include:
- Ceramic PCBs are good thermal conductors.
- Chemicals do not quickly erode ceramic circuit boards.
- Ceramic PCBs have excellent compatible mechanical intensity.
- Ceramic boards are easy to perform high-density tracing.
- Lastly, their CTA element compatibility is good.