Introduction

This Workshop was conducted to enhance communication among those involved in coating development for improved heat engine performance and durability. The marked success of the Workshop must be attributed to the cooperative spirit of the agencies involved. The efforts of the key people from the Department of Energy, the NASA/Lewis Research Center, the Oak Ridge National Laboratory, the Army's Tank-Automotive Command (TACOM), the Navy's David Taylor Naval Ship R and D Center - Annapolis, the Association of American Railroads, and the Maritime Administration, were instrumental in organizing and conducting this Workshop. Their endeavors are very much appreciated.

Coordination of interagency technical R & D is difficult at best for each agency has a different agenda. However, this Workshop provided a forum for discussion of programs of mutual interest. All agencies had strong interests in thermal barrier coatings (TBC) for engine applications. We were fortunate to have Bill Goward review the steady progress and problems encountered along the way in the use of TBC in aircraft gas turbine engines. Navy contractors discussed their work toward the elusive goal of qualifying TBC for turbine airfoil applications. In the diesel community, Caterpillar and Cummins are developing TBC for combustion chamber components as part of the low heat rejection diesel engine concept. The diesel engine TBC work is based on gas turbine technology with a goal of more than twice the thickness used on gas turbine engine components. Adoption of TBC in production for diesel engines could justify a new generation of plasma spray coating equipment.

Increasing interests in tribology were evident in this Workshop. Coatings have a significant role in reducing friction and wear under greater mechanical loadings at higher temperatures. The emergence of a high temperature synthetic lubricant could have an enormous impact on diesel engine design and operating conditions. The proven coating processes such as plasma spray, electron-beam physical vapor deposition, sputtering, and chemical vapor deposition have shown enhanced capabilites, particularly with microprocessor controls. Also, the newer coating schemes such as ion implantation and cathodic arc are demonstrating intriguing potential for engine applications. Coatings will play an expanding role in higher efficiency, more durable heat engines.

The Workshop Organizing Committee wishes to express appreciation to Ken Curtis, President of the Maine Maritime Academy, for the many courtesies extended in the conduct of the Workshop. We must also hoist the "Bravo-Zulu" pennants ("well done" for the non-nautical folks) for Len Tyler in recogcnition of his efforts contributing to the success of this meeting and the lobster bake.

Conference Organizer

Conference Organizer

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