TUNGSTEN AND ROCKET MOTORS
STANFORD RESEARCH INST MENLO PARK CALIF
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Spraying of alumina particles at low levels in the plasma-jet rocket exhaust simulator is reported. The alumina was introduced through the hollow rear electrode at relatively high flow rates using Ar as the carrier gas. No melting of the alumina was observed under these conditions, however, partial melting of the alumina particles was achieved at higher power levels with approximately the same alumina flow rates. The following modifications in the thermal shock apparatus were made to obtain an initial heating rate more nearly simulating that of a rocket nozzle in an actual firing 1 graphite heater elements were used in the thermal shock apparatus and 2 test specimens were dropped over the heater elements after they reached a high temperature. A recrystallized alumina ring was covered with a crack network after a 2-sec shock test in the apparatus.