A Laboratory Method for Thermal Fracture of Graphite
Rept. for Dec 1970-May 1972
AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS
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A method was developed for producing thermal stress failure in ATJ-S graphite and the initial results are described. Test specimens are 10-cm-long hollow cylinders with outer and inner radii of 1.9 and 0.4 cm, respectively. The outside is heated by induction at a frequency of 1.4 MHz by a 100-kW power oscillator the inside is kept below 100C by forcing water at a rate of 5 gpm through the copper-coated bore. A special lead soldering technique has been developed to fasten the coolant ducts to the specimen. The inductor coil is protected by an oil bath against heat and electric breakdown.
- Ceramics, Refractories and Glass