Wouldn't liquidus and solidus be the same temperature at the eutectic
point? I thought the eutectic point was at the intersection of the
liquidus and solidus curve, and one of the advantages of eutectic solder is
that it didn't have a mushy range between the liquidus and solidus
temperatures.
Karen Tellefsen - Electrical Testing
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Re: [TN] Max time above liquidus
Stadem, Richard D.
to:
TechNet
04/05/2012 11:09 AM
Sent by:
TechNet <[log in to unmask]>
Please respond to TechNet E-Mail Forum, "Stadem, Richard D."
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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