Parkhurst & Oliff
Low thermal expansion ceramic article
 A low thermal expansion ceramic article having a thermal expansion coefficient of not higher than 2.5.times.10.sup.-6 /.degree.C. within the temperature range of 40.degree.-800.degree. C., and comprising a plural number of ceramic parts bonded into a monolithic structure through glass-ceramics consisting mainly of 10-20% of MgO, 20-40% of Al.sub.2 O.sub.3, 40-60% of SiO.sub.2, 0.1-3% of BaO and 0.01-1% of ZrO.sub.2, is excellent in the heat resistance and in the thermal shock resistance, and can be advantageously used as a rotary regenerator type heat exchanger and a recuperative heat exchanger for gas turbine engine, stirling engine, and industrial apparatuses; and a rotor for turbocharger. 
NGK Insulators, Ltd.
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