Fire/Arson Investigations : Fire/Arson Investigations
A place to ask questions and add to probative and informative discussions associated with the various aspects of the field of fire investigation. -- FORUM RULES---BE CIVIL AND NO NAME CALLING, NO BELITTLING, NO BERATING, NO DENIGRATING others. Postings in violation of these rules can be removed or editted to remove the offending remarks at the discretion of the moderators and/or site administrator.
Re: Question for our electronic experts
Posted by: Mark Goodson (IP Logged)
Date: July 05, 2006 08:12PM
For real, 3 different phenomenon in fact
Tin whiskers
Dendritic growth
Kirkenndall voiding.. (sic?) and Horsting voiding
The first two are more related to PCB's
The latter is a diffusion process on IC packages where the rate of diffusion of Al into Au is different than Au into Al... the results are voids in the ball bond / bonding pad, which leads to poor weld strength and possible catastrophic failure of the bond...
You can also throw in intermetallic contamination (if someone didn't clean the photo resist off a multi layer PCB w/ a plasma cleaner) and it makes for interesting failure analysis
To make matters worse, some are temperature dependent in their manifestations..
Tin whiskers
Dendritic growth
Kirkenndall voiding.. (sic?) and Horsting voiding
The first two are more related to PCB's
The latter is a diffusion process on IC packages where the rate of diffusion of Al into Au is different than Au into Al... the results are voids in the ball bond / bonding pad, which leads to poor weld strength and possible catastrophic failure of the bond...
You can also throw in intermetallic contamination (if someone didn't clean the photo resist off a multi layer PCB w/ a plasma cleaner) and it makes for interesting failure analysis
To make matters worse, some are temperature dependent in their manifestations..
| Subject | Views | Written By | Posted |
|---|---|---|---|
 Question for our electronic experts
|
1764 | Nick Markowitz | 07/05/2006 04:46PM |
|
Re: Question for our electronic experts
|
1310 | John J. Lentini, CFEI | 07/05/2006 05:10PM |
|
Re: Question for our electronic experts |
1170 | Mark Goodson | 07/05/2006 08:12PM |
|
Re: Question for our electronic experts
|
1082 | Richard C. Howard CFI,CFEI,K-9 | 07/05/2006 09:11PM |
|
Re: Question for our electronic experts
|
1085 | Mark Goodson | 07/06/2006 08:26AM |
|
Re: Question for our electronic experts
|
1088 | Chris Bloom, CJBFireConsultant | 07/06/2006 12:55AM |
Sorry, only registered users may post in this forum.