A High Performance Cathode Heater for Hall Thrusters

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$600,000.00
Award Year:
2009
Program:
SBIR
Phase:
Phase II
Contract:
NNX09CA86C
Agency Tracking Number:
075351
Solicitation Year:
2007
Solicitation Topic Code:
S3.04
Solicitation Number:
n/a
Small Business Information
Sienna Technologies, Inc.
19501 144th Avenue NE, Suite F-500, Woodinville, WA, 98072-4423
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
015577190
Principal Investigator:
Ender Savrun
Principal Investigator
(425) 485-7272
ender.savrun@siennatech.com
Business Contact:
Karen Valdastri
Business Official
(425) 485-7272
karen.valdastri@siennatech.com
Research Institution:
n/a
Abstract
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 1300ºC 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 1300ºC-1600ºC 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 1100ºC-1300ºC. In Phase II, we will further develop the new ceramic insulator for use in LaB6 hollow cathode heaters that operate at 1600ºC. 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.

* information listed above is at the time of submission.

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