Best thermal conductor for HeatBlock
Posted by epareja
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Best thermal conductor for HeatBlock June 14, 2012 03:21PM |
Registered: 11 years ago Posts: 94 |
Hello again!
I have an aluminium heat block that can fit 2 power resistors, but the holes are a little bigger than the resistors so I will have air gaps between the block and resistor.
My block is like this (http://www.a2aprinter.com/index.php?route=product/product&product_id=62)
Can I use silicone heat cream like this Thermal Grease? or should I go for fire cement?
I'm not sure to go to fire cement because the resistors will be sealed and if there is any problem then I will loose all the block, is that right?
Thank you all
Ernesto Pareja
dcctrains.netne.net
I have an aluminium heat block that can fit 2 power resistors, but the holes are a little bigger than the resistors so I will have air gaps between the block and resistor.
My block is like this (http://www.a2aprinter.com/index.php?route=product/product&product_id=62)
Can I use silicone heat cream like this Thermal Grease? or should I go for fire cement?
I'm not sure to go to fire cement because the resistors will be sealed and if there is any problem then I will loose all the block, is that right?
Thank you all
Ernesto Pareja
dcctrains.netne.net
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Re: Best thermal conductor for HeatBlock June 14, 2012 04:20PM |
Admin Registered: 17 years ago Posts: 7,879 |
I glue them in with glass rope glue and then heat it very slowly the first time, otherwise it tends to blister. It can be removed if necessary.
Wrapping them in just enough aluminium foil to make a tight fit also works but it takes a few attempts to get right.
Normal heatsink compound just turns to powder and does not work.
Some people use silicone but I had a resistor fail using that as there is not enough thermal conductivity to stop it overheating.
[www.hydraraptor.blogspot.com]
Wrapping them in just enough aluminium foil to make a tight fit also works but it takes a few attempts to get right.
Normal heatsink compound just turns to powder and does not work.
Some people use silicone but I had a resistor fail using that as there is not enough thermal conductivity to stop it overheating.
[www.hydraraptor.blogspot.com]
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Re: Best thermal conductor for HeatBlock June 14, 2012 05:45PM |
Registered: 11 years ago Posts: 94 |
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Re: Best thermal conductor for HeatBlock June 14, 2012 05:49PM |
Registered: 13 years ago Posts: 818 |
nophead Wrote:
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> I glue them in with glass rope glue and then heat
> it very slowly the first time, otherwise it tends
> to blister. It can be removed if necessary.
>
I tried some glass rope adhesive (black and very runny) but it's been drying for over a week and is still tacky, do you need to heat it up to cure it? or do I have a bad batch, according to the bottle it's out of date by about 6 months - that's eBay for you.
[richrap.blogspot.com]
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> I glue them in with glass rope glue and then heat
> it very slowly the first time, otherwise it tends
> to blister. It can be removed if necessary.
>
I tried some glass rope adhesive (black and very runny) but it's been drying for over a week and is still tacky, do you need to heat it up to cure it? or do I have a bad batch, according to the bottle it's out of date by about 6 months - that's eBay for you.
[richrap.blogspot.com]
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Re: Best thermal conductor for HeatBlock June 14, 2012 06:45PM |
Admin Registered: 17 years ago Posts: 7,879 |
Mine is light brown and sets in about an hour but I usually leave it cooking overnight below boiling point and then slowly raise it to avoid it blistering.
[www.transtools.co.uk]
[www.hydraraptor.blogspot.com]
[www.transtools.co.uk]
[www.hydraraptor.blogspot.com]
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Re: Best thermal conductor for HeatBlock June 15, 2012 03:20PM |
Registered: 13 years ago Posts: 818 |
Thanks, I warmed it up and it's setting now, it looks like it's going to set hard like glass.
[richrap.blogspot.com]
[richrap.blogspot.com]
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Re: Best thermal conductor for HeatBlock June 16, 2012 02:34AM |
Registered: 12 years ago Posts: 140 |
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Re: Best thermal conductor for HeatBlock June 16, 2012 03:13AM |
Registered: 11 years ago Posts: 94 |
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Re: Best thermal conductor for HeatBlock June 16, 2012 11:00AM |
Registered: 14 years ago Posts: 689 |
I also use aluminium foil around the resistor, and seal the ends with a high temperature (+260C) epoxy putty called "quiksteel". I don't know how easy - or even if it's possible - to remove the epoxy if the resistor needs to be replaced, but it's worked good on the 5-6 heater blocks I've made.
--
-Nudel
Blog with RepRap Comic
--
-Nudel
Blog with RepRap Comic
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Re: Best thermal conductor for HeatBlock June 16, 2012 11:48AM |
Registered: 12 years ago Posts: 939 |
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Re: Best thermal conductor for HeatBlock June 17, 2012 05:39AM |
Registered: 12 years ago Posts: 140 |
epareja Wrote:
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> What type of silicone? The white one that is used
> for transistors and electronics? Yust to be clear
> because I'm not from USA: alfoil = aluminuim
> foil?
>
> Thank you
Hi, yes normal aluminium foil used for food etc.
The silicone is the one shown on my site.
Regards
Jan
-------------------------------------------------------
> What type of silicone? The white one that is used
> for transistors and electronics? Yust to be clear
> because I'm not from USA: alfoil = aluminuim
> foil?
>
> Thank you
Hi, yes normal aluminium foil used for food etc.
The silicone is the one shown on my site.
Regards
Jan
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