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Why the DCB ceramic PCB surface easy yellow during the production?

We always see the yellow surface in the DCB ceramic PCB surface although it does not affect the function, but looks unbeautiful.  In order to strongly combine the copper with ceramic substrate, especially when the copper is little, the exposed more substrate we need to do a special sinters process under appropriate high temperature, so it caused.

It’s unavoidable, we need to check and choose the better to ship out.


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