Arnold, White & Durkee
Ceramic rotors for pressure wave superchargers and production thereof
 Ceramic rotors for pressure wave superchargers are disclosed, which have a honeycomb structure, wherein a material constituting partition walls of the honeycomb structure has an apparent density of 4.0 g/cm.sup.3 or less, an open porosity of 3.0% or less, a coefficient of thermal expansion in a temperature range from room temperature to 800.degree. C. being 5.5.times.10.sup.-6 /.degree.C. or less, and a four point bending strength of 30 kg/mm.sup.2 or more. A process for producing such ceramic rotors for pressure wave superchargers is also disclosed. The process includes the steps of preparing a ceramic body in which an average particle diameter of a ceramic raw material is controlled to 1 to 10 .mu.m, extruding honeycomb structural bodies by press feeding the ceramic body through body feed holes and extruding channels having a width corresponding to a thickness of partition walls of the honeycomb structure in an extruding die, drying, firing and grinding the thus extruded bodies. 
NGK Insulators, Ltd.
Y B Y F
Y10T B28B Y10T F04F
additional inventional additional inventional
Kiminari Isao
Kato Oda