A High Performance Cathode Heater for Hall Thrusters
The current state-of-the-art co-axial swaged tantalum (Ta) heaters use magnesium oxide (MgO) insulators, which limits their operation to temperatures well below 1300Ã½Ã½C to prevent undesirable chemical reactions between Mg and Ta and heater failure. This program will develop a new ceramic insulator that is chemically compatibility with Ta and has high thermal stability at temperatures of 1300Ã½Ã½C-1600Ã½Ã½C for swaged heaters for BaO-impregnated and LaB6 hollow cathodes. In Phase I, we demonstrated the new ceramic insulators can be used in swaged Ta heaters for BaO-impregnated cathodes that operate at 1100Ã½Ã½C-1300Ã½Ã½C. In Phase II, we will further develop the new ceramic insulator for use in LaB6 hollow cathode heaters that operate at 1600Ã½Ã½C. We will develop an extrusion process to fabricate ceramic insulators with high dimensional tolerances at low cost and fabricate a prototype swaged coaxial heaters in collaboration with a heater manufacturer. Performance mapping and heater testing will be carried out in collaboration with an end-user aerospace company.
Small Business Information at Submission:
Sienna Technologies, Inc.
19501 144th Avenue NE, Suite F-500 Woodinville, WA 98072
Number of Employees: