Here's a summary of a 45 minute phone conversation I had with a tester at Particle Tech Labs. After I explained Jim Millette's study and the original Bentham paper to him about the thermites question, he pulled them up on his computer and gave them a quick look-see and said these things:
1.) I can do a DSC test but it will tell you nothing about the chemical composition of the materials in question. The chemical composition is much more important than a DSC test, which says nothing about what you have chemically.
2. You must know the chemistry of the sample first before you heat it. Then, a TGA (thermal gravitational analysis) can measure temperature of cooking vs mass loss. You have to have the right kind of test to get the proper combustion.
3. In a DSC analysis, you DON'T want to heat to combustion because at that point you lose your baseline. At that point in your DSC test "you throw everything to the wind." DSC is not the proper test for combustion of materials.
4. A DSC will measure the energy difference between a sample in a crucible and an empty crucible. The mass changes and that can be determined but again, not the chemical composition.
5. A bomb calorimetry test might be a little better for this, where you can measure the water temperature nearby as the material releases its energy. DSC is very limited in its usefulness for this purpose.
6. If argon or nitrogen is used in the testing atmosphere, and if there is no oxygen in the chips (as there would be in thermite), you could measure the gradual breakdown of the chemical structure as you heated it using different techniques than DSC.
7. WAIT A MINUTE! I couldn't test for thermitic materials! If they were there it would destroy my instruments! The alumina crucible used to hold the samples in the Bentham study can withstand temperatures of only 3200 degrees F, vs 4500 degrees for a thermitic reaction, so the crucible is not design to withstand the testing procedure if it IS thermitic. The Netzsch 404-C DSC testing device they used can handle high temperatures, which is a good thing. Not only could my equipment not measure temperatures in the thermitic range, but it would destroy my stuff so no I won't test it because I can't take the chance.
8. Netzsch Application Lab has very high temperature analysis ability, and several of the lab guys there have PhD's in thermal analysis. We can also ask them if they can analyze the DSC tests in the Bentham paper.
9. Just glancing at the Bentham DSC information, this is not my specialty but it makes no sense. Figure 19 doesn't look like the kind of energy curve I would expect from thermite, the ranges from each other are off by a factor of over 2, and I don't think this is the ignition temperature of thermite anyway. It looks more like a melting point curve at first glance, than a thermite energy release. But I'm no expert so check this impression of mine out.
10. One possibility would be a Simultaneous Thermal Analysis (STA) which would tie together DSC, TGA (to measure mass loss better) and Mass Spec. Cook the chips in oxygen to replicate the Bentham paper then cook them again in argon or nitrogen to see if they ignite at all.
So that's what the lab guy said. My conclusion, Senenmut: it will cost a lot more than $300 to go ahead with this and do it right. I mentioned the possibility of simply hiring someone to analyze what the Bentham DSC tests showed, and he said we might find the experts to do this at Netzsch.
I don't want to waste your money. What would you like to do?
Chris