Electronics Forum: l and bond and strength (Page 1 of 1)

Weak joint strength and black residue

Electronics Forum | Fri Jun 08 18:27:03 EDT 2007 | jmelson

This is probably an inner plated layer of the component that did not bond well. It may be a component that either has the wrong surface finish for lead-free or can't handle the temperatures. Many times I have seen a similar-looking layer when the l

Mixing conformal coating and RTV

Electronics Forum | Thu Apr 28 11:14:27 EDT 2005 | bbarr

If you apply the RTV after coating, what happens to bond strength since you are now bonding to the coating and not the board? Will the caps still survive vibration and shock? I specify applying RTV before coating for this reason. Am I correct? I als

Re: Reflow glue and past.

Electronics Forum | Tue Feb 08 16:09:09 EST 2000 | dean

Generally speaking with most electronic grade epoxies: 1. Cure time is a function of temperature. 2. Polymer bonds begin to quickly break down above certain temperatures (product specific). I believe aprox 170-180C. The strength of the bond de

soldering and bonding on gold PCB's

Electronics Forum | Wed Jan 09 14:52:53 EST 2002 | Chris

Hi, I have read many articles about theromsonically bonding to soft gold. Many of these articles state you can bond to 10uinches of gold. I have worked with both Hughes and Panasonic bonders at two different companies and I have never been able to

Re: Bow and Twist of PCB's

Electronics Forum | Wed Aug 19 08:00:55 EDT 1998 | Earl Moon

| Hi there, | I'm actually facing a lot of trouble with PCB's presenting up to 3mm of bow /twist at reception i.e. before assembly. The PCB size is 220 by 230mm. The boards are to be assembeled SMD double sides with 05.mm pitch on both sides. In orde


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