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July 2001

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Date:
Fri, 6 Jul 2001 11:50:07 -0500
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good day all,

Here is one from extreme left field:  we coat one of our chips with a
thermal spray process involving what is essentially a stream of molten
ceramic material.  The ceramic powder flows through a static dissipative
tube and goes out the metal torch, where the flame heats it to molten state
as it sprays.  The molten spray is deposited on the chip package surface,
which are mounted in a spinning aluminum wheel, which is grounded.  Here is
the question:

Have any of you seen (or have) data that suggests that molten ceramic
particles, flying through nitrogen-enriched air, generate static
electricity, keeping in mind that the supply tube, the torch and the target
are all grounded?

Doug Pauls
Rockwell

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