Posted 26 November 2011 - 10:58 AM
thanks for the links i had seen this example and spongeburghs, quite different results.
what i want to know is why it sparks and whether it is static electric, piezo electric, ferro electric or just heat and friction [differrent ceramics will display different traits], improperly charged mills and ones with lifter bars are vulnerable to heat build up whether it be from falling impacts or between the ball friction and i think the ceramic warms quicker than lead but doubt that it passes 300 degrees momentarily, the only cases of sparking media i have come accross are examples of luminous light which is not sufficint in energy or voltage to ignite bp even duct tape displays this light if you stick it together and pull it apart fast enough IT IS a release of energy but where does it come from how is it stored and discharged.
my curiousity is only that and im not trying to justify its use just want to know why, it is not worth the risk.
i will try to make them spark by banging them together at high and low speeds [10-500fps] and try to arc electricity over/through them to see if they are able to conduct or jump a spark gap also test them for piezo electric conductivity.
from what i have learned so far ceramics that spark [ conduct or insulate] have specific uses and are quite expensive compared to cheap clay based types used in baking beans.
the tests will not be sufficient evidence that they are safe to use and i will not recommend them to anyone.
dan.
it was only intended for inert milling and does such a good job in no time.
