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 Oxidative Degradation of Carbon-Carbon Composites
Carbon-carbon fiber composites are advanced materials with excellent strength to weight
performance characteristics. However, at high temperature in the presence of aerated
atmospheres, the carbonaceous fiber material will be susceptible to oxidation resulting in
both mass loss and a reduction in strength. Rapid thermal flucuations common in thin
components can work synergistically with the environmental degradation to produce
accelerated attack. Various glasseous, multilayer ceramic coatings are often used to
provide resistance to this form of environmental attack which must have both chemical
resistance and controlled thermal expansion properties.
 Stress Corrosion Cracking of Plastic Tubing in Potable Water
Several years ago, wide spread use of plastic tubing made was started in new house
construction and for repair of old systems. The flexible tubing was used to connect the
facets to the cold and hot water service. The stress corrosion crack (see arrow) developed
over about eight years when exposed to hot water and the stress of bending the tubing into
place.. The crack propagated through wall on the tension side of the bend and resulted in
leakage. Due to the extent of this problem and the extensive water damage that it has
caused to home owners, a large class action law suit resulted to recover damages.
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KPR ADCOR INC
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