Abstract
This chapter discusses the developments in science and technology of high–temperature, high-strength ceramics for heat-engine applications, especially those related with silicon nitride and silicon carbide materials. The characteristics of silicon nitride and silicon carbide as high-temperature, high-strength ceramics are summarized. The application of mechanical and gas pressure during sintering is effective in increasing density and controlling the microstructure. Many ceramic materials show time-dependent mechanical behavior. Glasses are known to show subcritical crack growth (SCG) in the presence of humidity. Silicon nitrides with metal oxide additives also show SCG at elevated temperatures where the crack growth occurs along the grain boundaries. Si-based ceramics have a remarkable potential for various structural applications. The applications of structural materials to various utilizations such as heat engines require the forming technology developments of the materials to desired size and geometry as the components at high temperatures. Further improvements in the technologies and developments of newer applications are expected to precede steadily hereafter in the world of engineering ceramics.
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