Structural Ceramic

Figure 1. Ford's uncooled, low heat rejection engine concepts

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To date, the investigations have concentrated on defining the fuel economy and emission potential of these concepts under conditions representative of the EPA urban driving cycle for passenger cars. These results have been regularly reported in the literature (1,2, and 3)*.

What is presented in this paper is data from the investigations of the nearer term concepts, pertinent to the "Coatings for Advanced Heat Engine Workshop", which have not previously been presented. These data concern the structural integrity of coated and insert components evaluated during these investigations. The noted observations, with respect to structural integrity, were judged not to be detrimental to the evaluation of concept fuel economy potential but are judged to be of concern regarding required long time durability of these components.

Ceramic Coatings

The engine components evaluated in the ceramic coatings concept (Phase 1) investigations were coated with plasma sprayed, yttria stabilized zirconia (Fig. 2). The coatings were applied in two layers: first, a thin (100 to 200 micron) nickel-chrome-bond coat; then, a thick (800 micron) insulating layer of zirconia oxide

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