Community Research and Development Information Service - CORDIS

Thermal shock testing of CMc protective coatings

Ceramic Matrix Composites (CMCs) are highly attractive materials for a multitude of advances applications. Carbon fibres as reinforcing component gives them unique strength and a tailorable failure behaviour due to the well-defined fibre-matrix interface that is still an unsolved problem for other types of fibres.

The vulnerability of carbon fibres by oxygen at elevated temperatures limits their application, unless an oxidation protection coating is applied. Various systems are available on the market and described in literature and patents.

The thermal mismatch between coating and bulk material introduces severe stresses that are most severe under high and very high thermal gradients. ARCS has developed a testing method that does allow to assess the stability and lifetime of a coating under high thermal loads that are to be regarded as thermal shocks, where a typical heating/cooling rate may be in the range of some ten to a few hundred Kelvin per second. These severe conditions may not be predominant in standard operation, but might occur under some operation conditions.

These results are required for CMC coating application in safety-relevant fields where a failure under non-standard operation conditions might cause significant material damage or even damage to people’s health and life.

Reported by

ARC Seibersdorf research GmbH
An der B60
2444 Seibersdorf
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