TUNGSTEN AND ROCKET MOTORS
STANFORD RESEARCH INST MENLO PARK CA
Pagination or Media Count:
The plasma-jet rocket-exhaust simulator was successfully fired at various power levels and Ar flow rates. After about 12 firings of from 5 to 15 sec, the brazed joint between the Cu and W electrode developed a leak in the cooling water system. Progress is reported on instrumentation of the W thermal shock test specimens. Chromel-Alumel thermocouples were attached by spot welding to the inside surface and Fe-Constantan thermocouples to the outside surface of the sintered W ring specimen. Interference was encountered from the strong pulsating magnetic field around the thermocouple leads and from the power rectifiers which were broadcasting 180-c electromagnetic waves. Shielding of the thermocouples was necessary and the temperature recording equipment was placed about 30 ft from the current rectifiers. Temperature versus time data are presented for a W ring of 76 theoretical density. W rings with densities as high as 93.4 of theoretical density have been produced by sintering 1 hr at 2550 C.