Carbon dioxide monitoring of composites

Details Carbon dioxide monitoring of composites Carbon dioxide monitoring of composites

1987-09-24

1989-05-02

Castel, Benoit

Chemistry: analytical and immunological testing

Process or composition for determination of physical state...

Corrosion resistance or power

422 53, 422 89, 422 78, G01N 3100, G01N 1700, G01N 3002, G01N 3112

Patent

active

048267708

ABSTRACT:
Coated carbon composite parts to be tested for oxidation resistance are heated in a closed oven filled with an oxidizing atmosphere. During the heat cycle the carbon dioxide content of the oven atmosphere is measured by an analyzer such as a gas chromatograph. These measurements on the amount of CO.sub.2 emitted by the part provide information on the onset of oxidative failure. It forms a nondestructive test when detection of excessive carbon dioxide concentration is used to reduce the temperature and flood the oven with inert gas so the part may be saved and reprocessed. This technique can be combined with conventional weight measurements before and after oxidation to identify the part constituent, carbon composite or protective coating, that failed.

REFERENCES:
patent: 4137047 (1979-01-01), Kim
patent: 4217544 (1980-08-01), Schmidt
patent: 4253846 (1981-03-01), Smythe et al.
patent: 4375451 (1983-03-01), Seligman et al.
patent: 4552722 (1985-11-01), Fritscher et al.

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