Freezing water at 0 degrees Celsius: It also takes 80 calories to freeze 1
gram of water. If 1 g of water (at 0 degrees Celsius) gives away 80
calories, it will freeze and its final temperature will be 0 degrees
Celsius.
Boiling water at 100 degrees Celsius: 540 calories are needed to turn 1 gram
(at 100 degrees Celsius) of water to steam (at 100 degrees Celsius).
I presume that it also takes energy to turn solid solder at the eutectic
temperature into liquid solder at the eutectic temperature. So if the oven
is at the eutectic temperature no heat transfer can take place to turn solid
solder into liquid solder.
Remember, just like water, calories run down hill :) and there is no hill
when the temperature is the same.
Have fun,
Ahne.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Wednesday, 23 May, 2007 10:36
To: [log in to unmask]
Subject: Re: [TN] SV: [TN] Definition of Eutectic Solder
Not worried about them, just curious about the effects of sustaining a
reflow profile right at the eutectic point of a given alloy.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord
Sent: Wednesday, May 23, 2007 11:57 AM
To: [log in to unmask]
Subject: [TN] SV: [TN] Definition of Eutectic Solder
Don't you all make this very academic and complicated. In my simple world
water is a liquid and ice is a solid. And there is nothing in between. So,
when the researchers down the South Pole pee at -60 Centigrades, they can
see how liquid changes to solid in a second.
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Brian Ellis
Skickat: den 23 maj 2007 18:04
Till: [log in to unmask]
Ämne: Re: [TN] Definition of Eutectic Solder
The range is theoretically 0°C for a perfect eutectic alloy.
Brian
Stadem, Richard D. wrote:
> Dave/Werner,
> In all of these discussions of the term eutectic alloy, I always
> wondered if there was a concrete definition of eutectic. Is there a
> specification or standard that determines the plus/minus temperature
> range over which an alloy transcends through the completely liquified
> stage to the completely solidified stage in order to be called
> "eutectic"?
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
> Sent: Wednesday, May 23, 2007 8:36 AM
> To: [log in to unmask]
> Subject: Re: [TN] Definition of Eutectic Solder
>
> Hi Werner! Here is the definition from the American Society for Metals
> (ASM) Metals Handbook, 2nd Edition:
>
> "Eutectic. (1) An isothermal reversible reaction in which a liquid
> solution is converted into two or more intimately mixed solids on
> cooling, the number of solids formed being the same as the number of
> components in the system"
>
> Now, your definition is perfectly correct too and I agree with it.
> However, using the terms Liquidus and Solidus are necessary in the
> definition. Most folks struggle a bit with the terms Liquidus or
> Solidus and I didn't want to get too deep in the metallurgy (Mr. Pauls
> has such a hard time understanding metals and the English language in
> general (if folks haven't noticed, Doug and I are making fun of each
> other today).
>
> Lots of fun metallurgy discussions to start the day! Very cool.
>
> Dave
>
>
>
> Werner Engelmaier <[log in to unmask]> Sent by: TechNet
> <[log in to unmask]>
> 05/23/2007 08:03 AM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to
> [log in to unmask]
>
>
> To
> [log in to unmask]
> cc
>
> Subject
> Re: [TN] Definition of Eutectic Solder
>
>
>
>
>
>
> Hi Dave,
> Sorry, I must disagree; your definition of "1) Eutectic: when a metal
> alloy transforms from a liquid state into a single solid state" is
> wrong.
> A eutectic alloy composition is by definition that composition where
the
>
> alloy's Solidus and Liquidus temperatures coincide and having the
lowest
>
> melting
> temperature among all other alloy compositions of the same materials.
>
> Werner
>
>
>
> **************************************
> See what's free at http://www.aol.com.
>
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