I am considering placing a typical PCB in a high-pressure oil environment. Right now it is just a "crazy idea", but I am wondering what would prevent this from theoretically working. Notionally, consider a motor controller consisting of some passives, a microcontroller and servo driver. All COTS.
The oil in use is non-conductive. I believe the core of my worry is about pressure on components. I am looking at about 300psi. Specifically, I would imagine some components on the PCB would not be tolerant to pressure (electrolytic capacitors). Some would be (SMD resistors, IC packages, etc.)
To be clear, the motivation for this idea is not related to cooling. It is simply convenient for my end application to be embedded in oil. (I tagged it with "cooling" because the setup is similar.)
Lastly, I have thought about possible references I can pursue for this. I know that some high-performance systems use phase change cooling within pressure vessels. I couldn't find any references on this, but I'm an EE and not physics. Perhaps there is some information out there on design of these systems?