My company is making use of aluminium nitride plates (of approx. size 6mm x 20mm by 0.6mm thick) for a thermally conductive, but electrically insulating interface for a high voltage device. In controlled conditions these parts work well, but in other environments we have observed varable electrical resistance. Also we have observed that if a person blows gently on to the plate during tests the resistance falls significantly (by at least 80%) and then recovers slowly over a period of around 10 seconds. I assume that humidity is causing these changes, but has anyone got any experience with this phenomenon. Is anyone able to provide information on the electrical resistance of AlN with respect to humidity? Through a web search I have found a limited amount of information that suggests resistance can drop in humid conditions if the material is porous and I am investigating further, but any assistance would be appreciated.
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