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Cleaning of Alumina Ceramics

Advanced technical ceramics, including ceramic alumina, are frequently being used as a replacement to metals, polymers, and refractory materials in various applications due to their properties like high temperature, hardness, and electrical resistance. They are used in car sensors and control systems, within our computers, and mobile phones. They can withstand extreme temperatures, and mechanical stresses, thus, contribute to better efficiency and productivity.

Cleaning Carbon Deposit Swirls On Alumina Parts

Q. Our parts, made of 99.5% alumina, have carbon deposits that show up after our brazing process. We do not use a flux for our ceramic parts; we high-temp fire a moly/manganese painted paste onto the ceramic. The part is then sent out for nickel plating to prevent corrosion of the moly manganese metallization areas. The next step is our brazing.

We are not seeing any spots on the parts before brazing, but as we continue through 5 brazing cycles and braze in a hydrogen/Nitrogen furnace with the cusil braze rings, we see black spots forming that show up as high-carbon deposits with the SEM data…

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