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Inert IR Reflow The Significance of Oxygen Concentration in the Atmosphere

Inert IR Reflow The Significance of Oxygen Concentration in the Atmosphere The benefits of controlling the atmosphere in an infrared reflow oven are evident in improved soldering yields and easier postsoldering cleaning of the assembly. The main benefits arise from reducing the oxygen partial pressure in the atmosphere at the time when the solder is molten. The most common inerting atmosphere used is nitrogen, and to reduce the oxygen concentration to 100 ppm is relatively straightforward, but below this level the equipment and the running costs increase with decreasing oxygen requirement. This paper gives data on the effects of reducing the oxygen level on a number of parameters relevant to high quality manufacture and product reliability. The aim is to identify which aspects of the soldering process are crucially sensitive to the oxygen concentration and which are not, in order to establish a good working compromise between oxygen level and the cost of its attainment. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Circuit World Emerald Publishing

Inert IR Reflow The Significance of Oxygen Concentration in the Atmosphere

Lea, C.
Circuit World , Volume 18 (3): 7 – Feb 1, 1992
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References (4)

Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0305-6120
DOI
10.1108/eb046163
Publisher site
See Article on Publisher Site

Abstract

The benefits of controlling the atmosphere in an infrared reflow oven are evident in improved soldering yields and easier postsoldering cleaning of the assembly. The main benefits arise from reducing the oxygen partial pressure in the atmosphere at the time when the solder is molten. The most common inerting atmosphere used is nitrogen, and to reduce the oxygen concentration to 100 ppm is relatively straightforward, but below this level the equipment and the running costs increase with decreasing oxygen requirement. This paper gives data on the effects of reducing the oxygen level on a number of parameters relevant to high quality manufacture and product reliability. The aim is to identify which aspects of the soldering process are crucially sensitive to the oxygen concentration and which are not, in order to establish a good working compromise between oxygen level and the cost of its attainment.

Journal

Circuit World – Emerald Publishing

Published: Feb 1, 1992

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