Sub-Millimeter C(f)/C Grids For High Power Ion Propulsion Engines

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: NASA1447
Amount: $69,972.00
Phase: Phase I
Program: SBIR
Awards Year: 2001
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Ceramic Composites, Inc.
1110 Benfield Blvd., Millersville, MD, 21108
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dr. Mark Patterson
 Chief Scientist
 (410) 224-3710
 patterson@techassess.com
Business Contact
 Sharon Fehrnbacher
Title: Vice Presidnet
Phone: (410) 224-3710
Email: sharon@techassess.com
Research Institution
N/A
Abstract
The high specific impulse and efficiency of ion propulsion thrusters has increased the popularity of these devices for a growing number of proposed missions, such as planetary and deep space, longer station keeping mission lifetimes, and tighter geosynchronous orbit tolerances. Grid erosion is one of the major life limiting phenomena for operating ion thrusters and carbon/carbon composite grids have shown to exhibit at least a 5 fold reduction in the erosion rate.Ceramic Composites Incorporated proposes a novel, low-cost fabrication approach for braided carbon/carbon composite grids with sub-millimeter hole sizes and narrower screen spacing. The thrust per unit beam area is directly proportional to the number of holes in the screen and accelerator grids, thus the smallest possible hole sizes and largest hole density potentially correspond to the maximum thrust density. The high thrust densities enable the accomplishment of a prescribed mission using either smaller thrusters or a smaller number of larger thrusters. A unique approach will be developed to fabricate a woven fiber preform containing sub-millimeter holes, which will be rapidly densified with pyrolytic carbon via chemical vapor infiltration. The grids will be evaluated to determine the ion extraction and other key parameters.

* information listed above is at the time of submission.

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