Microscopy: Tear-off test
If you spread a paste with a spatula on a smooth surface (glass slide) and then pull it off thinly until the layer tears off, you can already conclude two things. You can see how well the paste adheres to a smooth surface such as a GPU die and you can see how it tears off at the resulting edges. We can see that the Thermal Hero Quantum is more unstable but has less binder. The Ultra is much greasier and it is also shinier due to the silicone floating on top.
The particle test also shows that the Ultra relies on larger particles and a thinner matrix. The larger and cheaper particles also tend to slow down the minimal BLT. Only Quantum can be pressed to around 6 µm, which also reflects the particle size. Both pastes are rather poor as far as the binder is concerned.
Material analysis
I also need to say something up front to help you better understand the quantitative weights determined, as I normally use LIBS to determine the quantitative weights of individual chemical elements and not compounds. The aluminum found is a component of the contained Al2O3and thus binds the listed oxygen together with the zinc and silicon from the polymer of the matrix (this is also where the hydrogen is located). The mixture itself is ok, but the silicone oil is no good and we could have wished for a slightly higher ZnO content. This was trimmed for short-term performance.
The fish egg soup of the Thermal Hero Ultra completely dispenses with aluminum oxide, but is a pure zinc oxide paste that can be driven to a maximum of 3 W/mK. The fact that this value is not even reached is due to the vast amounts of silicone oil.
55 Antworten
Kommentar
Lade neue Kommentare
Urgestein
Veteran
Urgestein
Veteran
Urgestein
1
Mitglied
Veteran
Urgestein
Urgestein
Urgestein
Urgestein
1
Mitglied
Urgestein
1
Urgestein
Urgestein
Veteran
Alle Kommentare lesen unter igor´sLAB Community →