Yes, we want conductivity, and not heat capacity.
On 10/30/2020 3:06 PM, Luiz Alberto Saba wrote:
If my memory serves me, copper has the better conductivity of all the periodic
table...
Actually, carbon is at the top of the list.
Then silver, then copper.
Rick N6RK
Enviado do meu iPhone
Em 30 de out. de 2020, à(s) 18:56, Attila Kinali <[email protected]> escreveu:
Moin,
I have been looking at heat capacities of different materials
lately. One thing that struk me odd is, that the volumetric
heat capacity of copper, which is the thing that most people
use when building something that needs to have high heat capacity
to get stable temperature, has only a volumetric heat capacity
of 3.45 J/(cm^3·K). Meanwhile, the much cheaper iron has
a volumetric heat capacity of 3.53 J/(cm^3·K) and steel
even 3.75 J/(cm^3·K).
In an OCXO, which is generally size limited, getting the most
heat capacity in the limited volume would be the main goal,
wouldn't it? Also optimizing for price would be a major thing.
I can understand that iron is probably not the right choice
due to its tendency to oxidize. But using a soft (annealed) steel
would be easy to machine, cheaper per piece and give almost 10%
higher heat capacity in the same volume.
So why do people choose copper instead of steel?
Attila Kinali
PS: Fun fact: Water has a volumetric heat capacity of 4.18 J/(cm^3·K)
at 25°C. We should fill OCXOs with water! :-D
--
<JaberWorky> The bad part of Zurich is where the degenerates
throw DARK chocolate at you.
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