This volume consists of three major parts. The first part (covering about 2/3 of the volume) is devoted to the applications of silicon nitride in engineering ceramics, as understood in the broadest sense. Thus, the main groupings cover its use as a refractory and in metallurgy, joining, coatings (both in general and for specific purposes) as well as for components in gas turbines and reciprocating engines. However, the chapters on bearings, cutting tools, other tools, and general electrical applications demand additional space. This is true as well for the chapters on the use of silicon nitride in chemical, ceramic, and semiconductor production, in biotechnology, and as sensors or for optical products. Numerous smaller fields of application round out the picture to completion.