Differential Scanning Calorimetry (DSC)

[jeanjmds]

Hi,

I'm trying to use DSC to study phase transformation in a steel. I'm using an STA 449 F3 Jupiter equipment from Netzsch. The problem is that my equipment doesn't have vacuum and I saw some oxidation at the sample at the end of test. I'm using high purity argon (99.999%) as purge at 50 ml/min and I'd already tried to purge the chamber using argon for 1 hour before start test. My sample is 6 mm diameter and 0.2 mm tickness (between 10 and 20 mg as somebody told me and I saw in some books).

My question is: Does anybody knows how can I solve this oxidation problem in my sample without using vacuum?

Thanks.

 

[EdStainless]

1. Always keep you chamber under a light Ar purge, never just open to air.
2. Store samples in a container with descant to assure that they are very dry.
3. cycle the chamber empty before a run if you haven't used it for a while.
4. Install a dew point meter on the vent line, purge until you reach -40.

This is all in the details.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[CoryPad]

That device is multi-purpose (TGA, DTA, DSC). If you use a tradition DSC, the sample is contained inside a sealed pan that will prevent oxidation.