LISTSERV - TECHNET Archives - LISTSERV.IPC.ORG

TECHNET Archives

April 2009

TechNet@IPC.ORG

	LISTSERV Archives
	TECHNET Home
	TECHNET April 2009

	Log In
	Register

	Subscribe or Unsubscribe

	Search Archives
Options:	Use Monospaced Font Show Text Part by Default Show All Mail Headers
Message:	[<< First] [< Prev] [Next >] [Last >>]
Topic:	[<< First] [< Prev] [Next >] [Last >>]
Author:	[<< First] [< Prev] [Next >] [Last >>]
Subject:	Re: NTC - [TN] Gold/Tin Intermetallics, why are we afraid?
From:	"Whittaker, Dewey (EHCOE)" <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Whittaker, Dewey (EHCOE)
Date:	Mon, 27 Apr 2009 07:16:02 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (366 lines)
Yeah they're fit to be tied.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Monday, April 27, 2009 5:07 AM
To: [log in to unmask]
Subject: Re: [TN] NTC - [TN] Gold/Tin Intermetallics, why are we afraid?

Yes, but the rail companies really get upset when you microsection the 
rails.

Doug Pauls
Rockwell Collins



"Inge" <[log in to unmask]> 
04/24/2009 02:51 PM

To
"TechNet E-Mail Forum" <[log in to unmask]>, <[log in to unmask]>
cc

Subject
Re: [TN] NTC - [TN] Gold/Tin Intermetallics, why are we afraid?






Yes, you probably can. By means of a microscopic sample, it ought to be 
possible to see in a SEM. When the steel wheels pass, nanosized friction

weldings are created. When the last wheel pass, these tiny weldings are 
broken. The way the fractures look will tell in what direction the wheel

moved. But it's a bit of expensive way. A timetable is cheaper.

Inge


----- Original Message ----- 
From: "Douglas Pauls" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, April 16, 2009 10:20 PM
Subject: Re: [TN] NTC - [TN] Gold/Tin Intermetallics, why are we afraid?


> Well Dave, just remember this bit of wisdom - you can't tell which
> direction a train was movin' from the tracks.
>
> Doug Pauls
> Rockwell Collins
>
>
>
> "David D. Hillman" <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
> 04/16/2009 02:53 PM
> 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] NTC - [TN] Gold/Tin Intermetallics, why are we afraid?
>
>
>
>
>
>
> Hi Joyce! Authority??????? I am just a lowly engineer trying to find
the
> light at the end of the tunnel without having all the alligators in
the
> swamp get me first. My luck will be that the light at the end of the
> tunnel is Doug driving a train!
>
> Dave
>
>
>
> Joyce Koo <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
> 04/16/2009 02:48 PM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to
> Joyce Koo <[log in to unmask]>
>
>
> To
> [log in to unmask]
> cc
>
> Subject
> Re: [TN] Gold/Tin Intermetallics, why are we afraid?
>
>
>
>
>
>
> Ha, the authority is spoken!
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
> Sent: April 16, 2009 3:32 PM
> To: [log in to unmask]
> Subject: Re: [TN] Gold/Tin Intermetallics, why are we afraid?
>
> Hi Joyce - my response would "it depends" (and Doug gets another Diet
> Mt.
> Dew) as Rockwell Collins utilizes immersion silver pwb surface
finishes
> on
> many IPC Class 3 type products with no reliability issues.
>
> Dave
>
>
>
> Joyce Koo <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
> 04/15/2009 04:11 PM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to
> Joyce Koo <[log in to unmask]>
>
>
> To
> [log in to unmask]
> cc
>
> Subject
> Re: [TN] Gold/Tin Intermetallics, why are we afraid?
>
>
>
>
>
>
> "ImAG finishes have a 12-month shelf life in a controlled environment
> (<35[degrees]C/<85[degrees] RH), which can be significantly shortened
> when exposed to air pollution with high sulfur and chlorine content.
> Silver embrittlement Embrittlement
>
> A general set of phenomena whereby materials suffer a marked decrease
in
> their ability to deform (loss of ductility) or in their ability to
> absorb energy during fracture (loss of toughness), with little change
in
> other mechanical properties, such  ([Ag.sub.3]Sn intermetallics) of
> solder joints may occur when the finish thickness exceeds IPC-4553
> recommendations and Pb-free, high silver content solders are used.
ImAG
> is not recommended for high-reliability assemblies that must meet
> IPC-6010 Class 3 requirements, but is acceptable for Classes 1 and 2."
>
>
http://www.thefreelibrary.com/Will+discoloration+tarnish+ImAg+reliabilit
> y%3F+Watch+for+silver...-a0193896272
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier
/*
> Sent: Wednesday, April 15, 2009 4:34 PM
> To: [log in to unmask]
> Subject: Re: [TN] Gold/Tin Intermetallics, why are we afraid?
>
>
> Hi Vlad,
> I cannot comment on your specific case, but look at the pics below to
> see
> Ag-embrittlement.
> Sorry 'Netters, IPC strips pics.
>
> Werner
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0
> To unsubscribe, send a message to [log in to unmask] with following text
> in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at:
> http://listserv.ipc.org/archives
> Please visit IPC web site
> http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
> information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100
> ext.2815
> -----------------------------------------------------
>
> ---------------------------------------------------------------------
> This transmission (including any attachments) may contain confidential
> information, privileged material (including material protected by the
> solicitor-client or other applicable privileges), or constitute
> non-public
> information. Any use of this information by anyone other than the
> intended
> recipient is prohibited. If you have received this transmission in
> error,
> please immediately reply to the sender and delete this information
from
> your system. Use, dissemination, distribution, or reproduction of this
> transmission by unintended recipients is not authorized and may be
> unlawful.
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0
> To unsubscribe, send a message to [log in to unmask] with following text
> in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at:
> http://listserv.ipc.org/archives
> Please visit IPC web site
> http://www.ipc.org/contentpage.asp?Pageid=4.3.16
> for additional information, or contact Keach Sasamori at
[log in to unmask]
> or
> 847-615-7100 ext.2815
> -----------------------------------------------------
>
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0
> To unsubscribe, send a message to [log in to unmask] with following text
> in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at:
> http://listserv.ipc.org/archives
> Please visit IPC web site
> http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
> information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100
> ext.2815
> -----------------------------------------------------
>
> ---------------------------------------------------------------------
> This transmission (including any attachments) may contain confidential
> information, privileged material (including material protected by the
> solicitor-client or other applicable privileges), or constitute 
non-public
>
> information. Any use of this information by anyone other than the 
intended
>
> recipient is prohibited. If you have received this transmission in 
error,
> please immediately reply to the sender and delete this information
from
> your system. Use, dissemination, distribution, or reproduction of this
> transmission by unintended recipients is not authorized and may be
> unlawful.
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0
> To unsubscribe, send a message to [log in to unmask] with following text

in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: 
http://listserv.ipc.org/archives
> Please visit IPC web site 
http://www.ipc.org/contentpage.asp?Pageid=4.3.16
>
> for additional information, or contact Keach Sasamori at
[log in to unmask] 
or
>
> 847-615-7100 ext.2815
> -----------------------------------------------------
>
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0
> To unsubscribe, send a message to [log in to unmask] with following text

in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: 
http://listserv.ipc.org/archives
> Please visit IPC web site 
http://www.ipc.org/contentpage.asp?Pageid=4.3.16
> for additional information, or contact Keach Sasamori at
[log in to unmask] 
or
> 847-615-7100 ext.2815
> -----------------------------------------------------
>
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0
> To unsubscribe, send a message to [log in to unmask] with following text

in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to 
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to 
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: 
http://listserv.ipc.org/archives
> Please visit IPC web site 
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 
> for additional information, or contact Keach Sasamori at
[log in to unmask] 
or 
> 847-615-7100 ext.2815
> ----------------------------------------------------- 



---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at:
http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
ATOM RSS1 RSS2
LISTSERV.IPC.ORG