AIR PLASMA ARC MATERIALS TESTING FOR RE-ENTRY.
AEROSPACE CORP EL SEGUNDO CA
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Materials research in a sub-sonic air plasma arc, delivering a cold wall heat flux of 700 BTUsq ft -sec for 60 sec and a cold wall heat flux of 2400 BTUsq ft -sec for 30 sec is described. Arc cast HfC-C, ZrC-C, TiC-C, TaC- C, TiB2-B alloys are compared with commercially hot pressed HfC-C, Ti C-C, TaC-C alloys, infiltrated tungsten and sintered and forged tungsten, pressed and cast thoria and infiltrated thoria, pyrolytic and boron pyrolytic graphites, and with standards of comparison such as ATJ graphite and boron nitride. Pairs of motion pictures show a calibrated gray scale to give a brightness temperature profile, simultaneously with a record of material reactions. Measurements of mass ablation rates and longitudinal recession rates are compared. Hot and cold face temperatures on the flat faces of solid cylindrical specimens are noted. Author