Current or power more influential? Spray rate?
08-20-2007, 03:13 PM
|Current or power more influential? Spray rate?
1. For plasma spray parameters current and power(current * voltage ) , which one is more influential?
2. How to estimate deposition rate (micron/pass)? What is the definition of per pass?
08-20-2007, 07:33 PM
|RE: Current or power more influential? Spray rate?
Quote:1. For plasma spray parameters current and power(current * voltage ) , which one is more influential?
As far as power output of the gun is concerned current and voltage are equally influential. The influence on the properties of the plasma are more complicated. Voltage across the plasma is determined by the plasma gas flow and the chemical make-up. With an argon or nitrogen primary gas only plasma, altering current is our main way of adjusting plasma power. When adding a secondary gas like hydrogen, we can drastically alter the voltage of the plasma and thus the power output of the plasma. So altering the chemical make-up and gas flows of the plasma can have more influence on plasma properties than just altering current or power output alone. See http://www.gordonengland.co.uk/sef/volta...t-257.html
Quote:What is the definition of per pass?
The normal definition of a ?pass? in thermal spraying is one cycle or traverse of the gun across the coating area. For example one traverse of the gun along the length of a rotating part or one complete ladder scan of a non-rotating part. Confusion I suppose could arise from the fact that some overlapping can occur with this definition. For an extreme example the ?single pass method? where the total coating thickness is applied in one single traverse across a rotating part, where rotation speed is very high and traverse speed is very low. It could be said that this is not in fact a single pass, but a multitude of single passes (one per revolution) very slightly offset .
Quote:How to estimate deposition rate (micron/pass)?
More info here
Quote:Hi Fergus, Howied and all,
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