Doug

I have doubts as to whether it could pick up a charge, bearing in mind
that a flame is conductive plasma and the nozzle is grounded.

Brian

[log in to unmask] wrote:
>
> 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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