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Accelerated Hostile Environment Test Station

IP.com Disclosure Number: IPCOM000082293D
Original Publication Date: 1974-Nov-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 3 page(s) / 40K

Publishing Venue

IBM

Related People

Lukianowicz, W: AUTHOR [+2]

Abstract

Conventional hostile environment chambers involve the design and construction of a large box to be housed in a temperature-humidity (T/H) controlled cabinet. Not only is this time consuming, but it requires care in design to insure adequate mixing of the incoming corrosive gases with the T/H environment, and the conduction of that mixture over the parts to be tested. Subsequent to the exposure, the gases must be exhausted through a fume line, thereby involving the construction and hookup of a large sheet metal hood over the entire chamber.

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Accelerated Hostile Environment Test Station

Conventional hostile environment chambers involve the design and construction of a large box to be housed in a temperature-humidity (T/H) controlled cabinet. Not only is this time consuming, but it requires care in design to insure adequate mixing of the incoming corrosive gases with the T/H environment, and the conduction of that mixture over the parts to be tested. Subsequent to the exposure, the gases must be exhausted through a fume line, thereby involving the construction and hookup of a large sheet metal hood over the entire chamber.

It has been found that much of this effort can be avoided if only a small number of samples are to be examined. The figure shows the chamber which can be readily constructed from commercial glassware, and housed within a conventional T/H chamber.

As an example, a chamber 1 comprises 71/60 standard taper PYREX* end caps 2 (only one shown), each with two offset ball joints 3 as the ports, with a cylindrical PYREX body 4 also terminating at both ends in 71/60 standard taper joints.

To produce the required movement of gas through the system, one outlet port is connected to an air driver aspirator, not shown, of the type normally hung on a water faucet to produce a vacuum. Given the normal laboratory air supply and a simple regulator, reproducible flow rates through the apparatus of 2000 - 8000 cc/min are readily attained. Note that at the final concentration at which most hostile gases are used (<2ppm) they are all sufficiently soluble in water, so that they would dissolve completely in the water condensed from the corrosion chamber.

For example, fo...