Arnold, White & Durkee
Ceramic radial turbine rotor
 A ceramic radial turbine rotor made of a ceramic material having a strength s (kg/mm.sup.2) includes blade tips having a thickness t (mm). A product st.sup.2 of strength s and t.sup.2 (square of t) is representative of resistance to breakage of the rotor to foreign objects colliding against blades of the rotor. The product st.sup.2 fulfills a relation st.sup.2 .gtoreq.5.times.10.sup.4 vm+33. In this case, v is a circumferential speed of tip ends of inducers of blades of the rotating rotor when the blades are damaged by steel balls having a mass m (kg) colliding against the blades in a steel ball collision test of blades of a ceramic radial turbine rotor, and vm is a product of v and m. 
NGK Insulators, Ltd.
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inventional inventional inventional additional
Keiji Kiminari
Kawasaki Kato