interesting video on "diy" thermal epoxy

I've watched a bunch of this guys videos, he really does a fine job. Has a wide range of topics. Mr. Zen with his calm voice and easy style. Mikek

Good video, he is an awesome presenter and very knowledgeable ?

It was fun. Nice setup! I wasn't impressed with his thermal conductivity measurement. I guess I'd like to see two slabs of metal, one cooled and one heated. and then thermistors stuck in each block to measure temperatures. Oh and some controlled volume of epoxy between, so one could actually get numbers for his stuff, arctic silver, and JB weld (or whatever the other epoxy is) That would be useful and more convincing. You'd think he'd have made such a gimzo... How else did he find his mixture to be so good?

George H.

Right, the cheap IR temp meter snooping the top of that cheap sand-filled resistor is horrible. The resistors are hardly flat either.

This is measuring a slab of aluminum nitride:

The copper post has a thermocouple embedded near the bottom. There's another thermocouple on the aluminum block.

fredag den 28. februar 2020 kl. 02.15.23 UTC+1 skrev George Herold:

agree that measurement setup was a bit sketchy, though apart from the application of each compound, which we didn't see, it was the same for all of them

Since his measurements are multilayered nonsense, and he's getting the results that he wants, he's probably cheating.

George Herold wrote in news: snipped-for-privacy@googlegroups.com:

We had stycast and it was bad, so we looked and they have a thermal version. It is real grainy and is blue in color. Both fail because stycast has bad thermal expansion properties and breaks SMD parts. It is just too brittle too.

We did find an epoxy we liked and in talking to the binding guys, we found out that we could add silica powder or tiny spindly shards of it to our matrix and get better thermal performance. This is true.

But I saw a video on IC chips and how they make the 5 micron diamond cutting wheels they dice up chip dies with. They use diamond powder. So I guess that powder would likely enhance conduction better than the silica powder. It looked as fine as cinnamon.

Isn't his epoxy ending up as 'store bought'? I mean he sells it through his online store.

Not exactly rigorous comparison testing, I would expect multiple examples of each, and some proper double blind procedures.

Not science.

He looks like just another snake-oil salesman.

John

And some control over application area and thickness. And some decent temperature instrumentation. The laser dots on those cheap IR thermometers are illusions of aiming precision.

Yes. He has every incentive for his pompous measurements to increase sales.

Reminds me of the N-rays thing. One needs to be careful when making measurements, to not see what one wants to see. He could well be cheating unconsciously.

snipped-for-privacy@highlandsniptechnology.com wrote in news: snipped-for-privacy@4ax.com:

One does not need to optically flat polish a 4 inch sink plate face to place a 0.5" x 1.5" resistor... EVER!

And proper testing would prove that fact. The difference being very close to nil. Certainly not worth the labor to gain a negligible change. And one certainly does not need to go past 600 grit and even that is pushing it on claims of gains.

"Applied science" is neat too.

This robot is too boring to watch. I've seen more entertainment in MSDSs.

Cydrome Leader wrote in news:r4jes1$s1m$ snipped-for-privacy@reader2.panix.com:

The B movie link I posted the other day is more interesting... and funny.

It also has a robot.

Ha, the video game scene from the 1950s is pretty good. Tobor is clearly more fun than the applied boredom robot host. Text to speech synthesizers sound more human than that guy.

Cydrome Leader wrote in news:r4jn4m$mia$ snipped-for-privacy@reader2.panix.com:

Yeah, I forgot to mention that it looks like that is where the game "Asteroids" came from.

I like the crypto remote control for the gate, and his description of how it was 'unbreakable'.