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COATING OF SILICON CARBIDE MATRIX COMPOSITES FOR INDUSTRIAL USE IN CORROSIVEENVIRONMENTS

Objective


Two coating routes have been developed :
- thin adherent laser ablated coatings
- strain tolerant plasma sprayed coatings
A number of different coating materials have been deposited on both C/SiC and SiC/SiC composites and exposed to temperatures in excess of 1000 C.
Best thermal shock resistance and protectiveness to oxidation and gas corrosion was achieved with Mullite and Zirconium silicate coatings which have only a low thermal expansion mismatch with the composite.
For protection against cast iron a capping layer of Alumina or Zirconia is needed. The protectiveness of the coating is related to its thickness, adhesion, porosity and susceptibility to cracking.
Trial components have been manufactured for testing in a radiant tube furnace and a cast iron pouring chute. Two Ring Segments in the Radiant Tube Furnace have survived 1200 at > 1200 C without serious degradation. The performance of coated CMCs in the cast iron pouring tests is superior to that of uncoated materials, a real Trapezoidal Plate has been tested during 15 days on a Production line, surviving 4160 cycles.

Coordinator

Societe Europeenne de Propulsion SA (SEP)
Address
52 Quai De Dion Bouton
92800 Puteaux
France

Participants (5)

British Gas plc
United Kingdom
Address
Midlands Research Station Wharf Lane
B91 2JW Solihull
Centre National de Recherches de Pont-à-Mousson
France
Address

54700 Pont-à-mousson
Ceramics and Refractories Technological Development Company
Greece
Address
Aidipsos National Road 5Th Km
34100 Chalkida
UNIVERSITA DEGLI STUDI DI NAPOLI FEDERICO II
Italy
Address
Piazzale V. Tecchio 80
80125 Napoli
United Kingdom Atomic Energy Authority (UKAEA)
United Kingdom
Address
Harwell Laboratory
OX11 0RA Didcot