what type of oven heats up metal (solder) faster than cured polymer? [Archive]

Jeff S

Jun17-04, 04:19 AM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>\nHi All,\n\nI\'m working with some silicon chips and I\'m looking for a type of oven\nthat can heat up the solder finish rather quickly (in seconds would be\ngreat) but not so much for the body of the chips.\n\nI was thinking that an IR furnace will probably do it but someone said\nit could do just the opposite.\n\nCan someone here answer this question for me?\n\nThanks!\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>Hi All,

I'm working with some silicon chips and I'm looking for a type of oven
that can heat up the solder finish rather quickly (in seconds would be
great) but not so much for the body of the chips.

I was thinking that an IR furnace will probably do it but someone said
it could do just the opposite.

Can someone here answer this question for me?

Thanks!

Uncle Al

Jun17-04, 01:56 PM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>\nJeff S wrote:\n>\n> Hi All,\n>\n> I\'m working with some silicon chips and I\'m looking for a type of oven\n> that can heat up the solder finish rather quickly (in seconds would be\n> great) but not so much for the body of the chips.\n>\n> I was thinking that an IR furnace will probably do it but someone said\n> it could do just the opposite.\n>\n> Can someone here answer this question for me?\n\nA microwave oven will heat closed path conductors much faster than\ndielectrics, in general, perhaps frying your chip and leaving its\npackaging unharmed. It depends on what teh packaging filler is -\ndieletric loss at frequency. Small features may not heat at all,\ncertainly if they are positioned at a node. One generally wave\nsolders. If you use an IR cannon you may have to blacken (in the IR!)\nthe targets. Ditto a laser pulse - the target must be black at the\nirradiating wavelength and off-target not.\n\nPulsing is good. By the time the heat spreads to non-traget areas its\nconcentration has dissipated.\n\n--\nUncle Al\nhttp://www.mazepath.com/uncleal/qz.pdf\nhttp://www.mazepath.com/uncleal/eotvos.htm\n(The parity Eotvos experiment is queued)\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>Jeff S wrote:
>
> Hi All,
>
> I'm working with some silicon chips and I'm looking for a type of oven
> that can heat up the solder finish rather quickly (in seconds would be
> great) but not so much for the body of the chips.
>
> I was thinking that an IR furnace will probably do it but someone said
> it could do just the opposite.
>
> Can someone here answer this question for me?

A microwave oven will heat closed path conductors much faster than
dielectrics, in general, perhaps frying your chip and leaving its
packaging unharmed. It depends on what teh packaging filler is -
dieletric loss at frequency. Small features may not heat at all,
certainly if they are positioned at a node. One generally wave
solders. If you use an IR cannon you may have to blacken (in the IR!)
the targets. Ditto a laser pulse - the target must be black at the
irradiating wavelength and off-target not.

Pulsing is good. By the time the heat spreads to non-traget areas its
concentration has dissipated.

--
Uncle Al
http://www.mazepath.com/uncleal/qz.pdf
http://www.mazepath.com/uncleal/eotvos.htm
(The parity Eotvos experiment is queued)

Peter Tobias

Jun17-04, 06:15 PM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>Jeff S:\n> I\'m working with some silicon chips and I\'m looking for a type of oven\n> that can heat up the solder finish rather quickly (in seconds would be\n> great) but not so much for the body of the chips.\n\nOvens for Rapid Thermal Annealing work with infrared heating and can\nheat up a sample in seconds. Search www.google.com\n\n> I was thinking that an IR furnace will probably do it but someone said\n> it could do just the opposite.\n\nSomeone is wrong here.\n\nRegards,\n\nPeter\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>Jeff S:
> I'm working with some silicon chips and I'm looking for a type of oven
> that can heat up the solder finish rather quickly (in seconds would be
> great) but not so much for the body of the chips.

Ovens for Rapid Thermal Annealing work with infrared heating and can
heat up a sample in seconds. Search www.google.com

> I was thinking that an IR furnace will probably do it but someone said
> it could do just the opposite.

Someone is wrong here.

Regards,

Peter

Larry

Jun21-04, 02:51 AM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>"Jeff S" <jeffs429@hotmail.com> wrote in message\nnews:d41e013a.0406161402.6824880a@posting .google.com...\n\n> I\'m working with some silicon chips and I\'m looking for a type of oven\n> that can heat up the solder finish rather quickly (in seconds would be\n> great) but not so much for the body of the chips.\n>\n> I was thinking that an IR furnace will probably do it but someone said\n> it could do just the opposite.\n>\n> Can someone here answer this question for me?\n\n\nA small (500 watt or 1KW) 400 KHZ induction heater with a pancake or\nsolenoidal output coil should work very well. Try google. Have\noccasionally seen used units on Ebay. Larry\n\n\n[Moderator\'s note: Formatting improved by moderator. Please see\nhttp://www-stud.uni-essen.de/~sb0264/HowToPost.html. -usc]\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>"Jeff S" <jeffs429@hotmail.com> wrote in message
news:d41e013a.0406161402.6824880a@posting.google.c om...

> I'm working with some silicon chips and I'm looking for a type of oven
> that can heat up the solder finish rather quickly (in seconds would be
> great) but not so much for the body of the chips.
>
> I was thinking that an IR furnace will probably do it but someone said
> it could do just the opposite.
>
> Can someone here answer this question for me?

A small (500 watt or 1KW) 400 KHZ induction heater with a pancake or
solenoidal output coil should work very well. Try google. Have
occasionally seen used units on Ebay. Larry

[Moderator's note: Formatting improved by moderator. Please see
http://www-stud.uni-essen.de/~sb0264/HowToPost.html. -usc]