ya safety is first, thanks for ur kind information…..

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TEKTONE Global Technologies Foundation Inc. is a technical-vocational institution in Bicol that is the premier training provider of globally-competitive skilled workers in construction, tourism and related sectors. It provides competency-based training for welding and heavy equipment operation.

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Leslie,

That is a great point- It is always a good idea to use proper safety precautions. However, the process of cold welding indium does not require the use of an arc welder. Cold welding implies that no heat is used.

Still, the process may include acid, which has its own safety precautions.

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It is important to remember to use proper eye protection. Be sure the light from an arc welder can’t get in. It’s very painful to burn your corneas and the pain may not start for hours after the injury.

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I do not know the answer to this. Not to my knowledge. My customers have not mentioned another standard and are each doing dramatically different types of testing to mimic accelerated life in their devices.

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Offhand I do not, however my technical counterpart in India, Liya Koorithodi should be able to assist you with this. I will forward him your e-mail address and have him get in contact with you.

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Aaron,

Thanks for the comment. What you are saying definitely makes sense. The addition of the immersion fluid is step one but the rest of the system requires consideration as well. I’ll check out your link and see what more I can learn from you!!

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Thanks Bob. Please do. I’m glad to hear that you’ve found the information informative. Let me know if you have any specific questions pertaining to your own work.

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Sorry, I have not characterized the indium oxide thermal conductivity. It was a test we considered at one time but we ran HAST tests on our TIMs and when there was no noticeable change in resistance after 1000 hours of testing, we determined that this value was irrelevant for our needs.

I do have more reference material regarding indium properties. Shoot me an e-mail and I’ll forward it on.

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Great article Amanda! I sure wish I was up to more speed on some of these processes. I will keep gleaning information from your website.

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I can tell you from experience that it is in fact better than surface liquid cooling as long as provisions are made for radiating heat out of the immersion fluid. Something else to consider is that with the advent of solid state drives, it’s becoming easier than ever to do full immersion. As a tasty add-on, you can chill the fluid, and since there is no exposed fluid, condensation is not a problem, and you can run components under ambient temps. Click my link for picks on how I made my submerged case (WAY before these guys came along BTW, I have half a mind to challenge their patent..).

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Hello

I am lloking for Indium bump sources in India for bonding my sensor chip on a ceramic carrier. CAn you suggest anyone who can handle the job in India?

Thanks

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i need complete indium reference material

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Is there an industry standard for reliability test or accelerated life test for TIM similar to temperature cycling test (JESD22-A104) for component devices?

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The Industry Standard for thermal testing of component devices is the JEDEC 51 methodology.

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Thank you for your input Paul. I agree with you that the most widely accepted heat measurement is Watts, and this is what I try to cite. Celsius seems widely accepted over Fahrenheit, but anyone looking for BTUs does need the Fahrenheit equivalents.

I looked up on Wikipedia “English Units” and it says right in the definition that this term is confusing to readers from the UK since it is a US term. I’ll try to bite my tongue the next time and refer to these values as Imperial Units.

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Just spec everything in metric, with possibly an “informational” column with the inch equivalent.

Heat is measured in Watts (metric unit).
Temperature ranges for semiconductors are specified in Celsius. Converting to BTU and Fahrenheit and back is silly.

BTW, it’s no longer appropriate to call say “English” units, since the UK is well into metric.

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Hi Amanda,
I would like to thank you for having this blog on TIM. This is very informative.

I am still new in the application of heatsink and TIM, with the so many kinds of TIMs, what would be the appropriate reliability test to use for each of this? Is there an industry standard?

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My favorite TIM is In foil (99.99% In)
We are using this TIM for our Burn-In system and so far after many alternative TIM experiments, only In Foil can be used on our Burn-In condition due to its lowest thermal resistance. Other TIM’s resistance is just too high used.

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Recently I tested what I refer to as a carbon pad as a TIM between a heat source and a heat sink. The resulting change in temperature was 0.12C above soapy water in the same tester.

Art.

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Robert-
I will E-mail the paper description to you.

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I’m doing a transient thermal analysis of the package which may use Indalloy #7 solder. I cannot find the specific heat for this material on your web site.

Do you have the value and a reference?

Thanks
Steve

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Interesting! Would you please give more information about the paper by Dr. Rudiger Bredmann?

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Hi,

I would be extremely interested in getting the stability test data of these three TIM materials i am interested in working with:

In100, Sn70Pb18In12, In80Pb15Ag5

Could you send me the data?

many thanks

ronggui

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Although I prefer In, In/Ag, and Au/Sn – there is a place in my heart for Sn/Pb. Even though it’s not an alloy thought of for cooling applictions, it has transfered heat out of normal solder joints for hundreds of years.

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Thanks Rick! I do indeed hope to do a “Meet the Bloggers” session myself in the coming months! I’ll keep everyone posted for it when the time comes!

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We will not be complete at this event without you, Mrs. Hartnett.

We are looking forward to the time when you host a MEET THE BLOGGERS event at one of your exhibitions in the near future.

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I agree that the data sheets should be updated to add universal clarification. It is a task that has already begun.

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Will you be updating your Product Data Sheet with this info? Sounds like you should.

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I am looking for the thermal conductivity of In2O3. Do you have any idea or recommended book?

Thank you very much

Raquel

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