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raviswanadha · 05-23-2008, 12:44 PM,

Dear Gordon what should be the thickness of pure alumina coating by plasma spray to withstand a DC voltage of 1000Volts. Is there a chart or any caluculation to find the thickness required to withstand a particular voltage.
regards
Ravi Question

***Gordon*** · 05-23-2008, 10:59 PM,

Hi Ravi

It will depend very much on the specific alumina powder and plasma parameters. Typically, 50 - 700 volts/0.001" (25 micrometre) dielectric strength. Premium fine high purity alumina spray with optimum parameters (1% porosity or less) giving best values. Higher and far more consistent values obtained on sealed coatings.

landemarre · 07-07-2008, 10:03 AM,

raviswanadha Wrote:Dear Gordon what should be the thickness of pure alumina coating by plasma spray to withstand a DC voltage of 1000Volts. Is there a chart or any caluculation to find the thickness required to withstand a particular voltage.
regards
Ravi

For plasma spray alumina, for 1000Volts you should have around 200micrometers of alumina coating.

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