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ToolGuyd > Editorial > A Closer Look at Lead-Free Solder

A Closer Look at Lead-Free Solder

Oct 25, 2012 Stuart Discuss

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Solder Ball Cross Section Dark Field

Here are a couple of images of lead-free solder that I took with an optical microscope back in 2005. At the time I was studying the reflow properties and behavior of the NEMI-recommended solder composition Sn3.9Ag0.6Cu (95.5% tin, 3.9% silver, 0.6% copper).

One interesting thing about this solder alloy is that, when the cooling rate is slow and controlled, it requires quite a bit of undercooling to recrystallize after being melted. What this means is that my samples needed to be cooled to 15-20° below their melting points before they would recrystallize.

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Above is a 200x dark field image, and following are 100x images taken using bright field and polarized bright field illumination. The sample is about 1.0 mm in diameter, or about 0.04″.

Solder Ball Cross Section Bright Field

Solder Ball Cross Section Polarized Light

The samples were cross-sectioned, polished, and etched.

If you haven’t already seen them, I also posted high-magnification images of broken-up diamond particles and faceted diamond particles.

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