1240

(18,000)

Conclusions obtained from the two dimensional modeling of ceramic coatings on a piston top were as follows:

1. Coating stresses are very dependent upon the thickness of the coating.

2. Layered coatings did not reduce the stress level significantly under the conditions modeled, but the higher strengths of the ceramic metal mixtures should increase the probability of success.

3. ihe use of a superalloy substrate resulted in the lowest stress level; use of fiber reinforced aluminum resulted in the highest.

4. Coating thickness can be used as a design variable to produce a more favorable stress distribution.

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