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April 2012

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Subject:
From:
Ioan Tempea <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ioan Tempea <[log in to unmask]>
Date:
Thu, 5 Apr 2012 11:27:55 -0400
Content-Type:
text/plain
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text/plain (128 lines)
Guys,

You won't make a big fuss out of it! Werner was right, and everything is in the magical word Eutectic that Richard named. At this point precisely, the liquidus point is equal to the solidus, as there is no pasty region, all the solid with this composition instantly turns into liquid.

Regards,

Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer
T | 450.967.7100 ext.244
E | [log in to unmask] 
W | www.digico.cc

N'imprimer que si nécessaire - Print only if you must

-----Message d'origine-----
De : Fox, Ian [mailto:[log in to unmask]] 
Envoyé : April-05-12 11:22 AM
À : [log in to unmask]
Objet : Re: [TN] Max time above liquidus

Yes he was. Liquidus and solidus are metallurgical terms which describe the upper and lower boundary lines of liquid+solid regions in alloy phase diagrams, in fact as they are also used in glass phase diagrams. Open any metallurgical text book and in the phase diagram section you will find them thus described.

It also sounds like Doug has been at the mountain dew again :-)

Regards
Ian

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: 05 April 2012 15:59
To: [log in to unmask]
Subject: Re: [TN] Max time above liquidus

Werner emailed several times to me directly, and to others on the forum that the term "above liquidus" should not be used when dealing with eutectic solder, as there was no such thing as being above the liquidus, ie, above the molten state. The solder is liquidus above the solidus temperature, solid below it. So, to describe the molten state of the solder, the correct term would be "above solidus". Was he wrong?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, April 05, 2012 9:51 AM
To: [log in to unmask]
Subject: Re: [TN] Max time above liquidus

Agreed.  I believe Richard is referring to the seldom referenced Vapidus temperature where vapor and liquid can co-exist.

Doug Pauls



From:   "Fox, Ian" <[log in to unmask]>
To:     <[log in to unmask]>
Date:   04/05/2012 09:26 AM
Subject:        Re: [TN] Max time above liquidus
Sent by:        TechNet <[log in to unmask]>



Richard, the liquidus temperature is the maximum temperature at which solid crystals can co-exist with liquid. Above the liquidus the material is completely liquid. The solidus temperature is in contrast the temperature below which liquid can't exist. In terms of a tin/lead phase diagram it is the upper boundary of the liquid+solid "mushy" region

Regards
Ian

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: 05 April 2012 14:32
To: [log in to unmask]
Subject: Re: [TN] Max time above liquidus

You mean time above solidus. Time above liquidus is vapor. 
Yes, 105 degrees in liquidus does seem excessive, but it depends on the size/mass of the CCA being soldered. It might be required for very large CCAs.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Fabien Guizelin
Sent: Wednesday, April 04, 2012 6:04 PM
To: [log in to unmask]
Subject: [TN] Max time above liquidus

Hi,
Should I be concerned by excessive TAL ?   (inter-metalic, etc)
Do you consider 105sec TAL with a Indium 5.1 paste excessive ?   (Indium 
recommends 45-60sec)
Thanks,
Fabien



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