Microscopy and surface analysis
Smearing under pressure helps to identify the “tear-off edges” and therefore also the adhesion of the paste. Putties that are too sticky and liquid also allow the binding polymer, including the smallest particles, to be simply wiped out. Very viscous putties tend to show abrupt tear-off edges. Please click on the images for a full screen:
| Halnziye 234 | Halnziye 236 | Halnziye 268 | Extreme64 |
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We can now see all the products tested at 1000x magnification and with an additional particle measurement, although with such viscous polymers, with the exception of HY 268, this is more of a measurement of bubble formation on the surface. Again, please click for full screen:
| Halnziye 234 | Halnziye 236 | Halnziye 268 | Extreme64 |
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Material analysis
Let’s now take a closer look at what is actually inside and what is not. The inexpensive HY 234 contains mainly ZnO as heat-conducting particles. The aluminum oxide content is quite low, with a ratio of approximately 3:1 including all tolerances.
Now let’s take a look at the closely related HY 236. The ratio of ZnO to Al2O3 is analogous to HY 234, the differences are marginal and also pass as measurement tolerances. The fillers are therefore very similar in both putties and the difference must be located in the polymer used
With the HY 268, the aluminum oxide now predominates and everything looks more like a rather viscous heat-conducting paste. With all the advantages but also disadvantages.
The Extreme64 relies on more polymer and less zinc oxide and, above all, much less aluminum oxide. PTM materials, which consist only of polymers and completely dispense with metal oxides in their conventional form, show that this can work well.
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