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Module Corrosion Thermal Fatigue Unit

IP.com Disclosure Number: IPCOM000082454D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Krall, B: AUTHOR [+3]

Abstract

Modules are placed into the gold-plated sockets, as shown in Figs. 1 and 2, which are in intimate contact with the alumina (Al(2)O(3)) disc. The disc is the thermal pipe from the modules to the temperature source (thermal environment provided by the thermal tester). Al(2)O(3) is a good conductor, thus there is a minimal thermal lag between the module temperature and the tester temperature at any instant.

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Module Corrosion Thermal Fatigue Unit

Modules are placed into the gold-plated sockets, as shown in Figs. 1 and 2, which are in intimate contact with the alumina (Al(2)O(3)) disc. The disc is the thermal pipe from the modules to the temperature source (thermal environment provided by the thermal tester). Al(2)O(3) is a good conductor, thus there is a minimal thermal lag between the module temperature and the tester temperature at any instant.

The system is evacuated to 10/-8/ torr, as determined by an ion gauge whose throat is directly above the modules. Upon closing the bellow valve to the vacuum system, very minute quantities can be accurately backfilled into the system via the variable-leak micrometer valve. The backfilling is continuously monitored by the ion gauge. If the desired concentration is overshot, the bellows valve can be reopened to the vacuum pumping package to remove the excess. The glass stopcock is closed, to prevent the possible subsequent reaction of the pollutants with the metallic walls of the bellow valve during thermal cycling.

Combinations of desired pollutants can also be easily introduced into the chamber accurately, using the aforementioned procedure for a single gas. A solenoid valve, not shown, with only one open port is placed downstream from the variable leak valves, not shown, of the individual gases. The unit is placed in a standard commercial temperature cycling chamber, where the adjustments are made to provide the desired prof...