Laser Induced Reaction Coatings of Ceramics
Under the three-year sponsorship of Department of Energy, a laser-induced
reaction coating of ceramic on ceramic in non-vacuum environment was developed
and studied. Al2O3 ceramic coating on SiC/Al2O3 ceramic composite was deposited
in air using a CO2 laser operated in continuous wave mode. The ceramic coating
synthesized using this technique was uniform and dense which provided long
duration (approx 200 hours) protection from oxidation corrosion at elevated
temperatures (1000-1300oC) to the composite. The scanning electron micrograph
 shows a cross sectional view of laser-induced
reaction coated SiC/Al2O3 composite. It is expected that this success will
lead to the synthesis of a variety of ceramic coatings on various metal and
ceramic substrates for applications such as heat exchangers, incinerators, etc.
which involve extreme working conditions in terms of temperature and chemical
environment.
Investigator: Dr. N.B. Dahotre
Sponsor: Department of Energy
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