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The Use of Boron Nitride for Improved Cold-Cathode Electron Field Emission Technology

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: F49620-03-C-0090
Agency Tracking Number: F033-0354
Amount: $99,992.00
Phase: Phase I
Program: STTR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Solicitation Year: N/A
Award Year: 2003
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
P.O. Box 131460
Ann Arbor, MI 48113
United States
DUNS: 610511334
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Jon Van Noord
 Senior Engineer
 (734) 930-6692
Business Contact
 Alec Gallimore
Title: CEO/ Chief Engineer
Phone: (734) 930-6692
Research Institution
 Kathryn A Dewitt
Div of Research Devel & Admin, Room 1058; 3003 So. State St.
Ann Arbor, MI 48109
United States

 (734) 763-6438
 Nonprofit college or university

Low-power Hall thrusters offer potentially important advantages for certain military applications but issues of lifetime and efficiency degradation at lower powers are issues hindering its utilization. A factor impacting efficiency is that thestate-of-the-art techniques for electron generation used for neutralization (such as hollow cathodes operating on the same propellant as the thruster) do not scale down in mass, power, and propellant consumption as readily as the miniaturized thrustersthemselves. This proposal outlines a possible solution utilizing Boron Nitride (BN), a chemically inert, tough, low work-function material, for improved cold-cathode electron field emission technology. The desirable characteristics of leading electronemission materials such as molybdenum tips and Carbon Nanotubes (CNT) are well known. However, the chemical reactivity of these materials, especially carbon, in oxidizing environ-ments presents significant limitations with respect to their application inHall thrusters and other propulsion technologies (both operational and handling factors). The propellantless nature of this approach eliminates the neutralizer as a degrading factor for efficiency and its superior material properties offer the possibilityof long lifetime operation. Producing a cold-cathode emitter using boron nitride would have application across the field of electric propulsion including thrusters and tethers. It could provide a long-life emitter that would not require a propellant andcould replace hollow cathodes and enable lower-power thrusters. Further developing boron nitride has applications beyond propulsion. Both phases of BN are chemically inert, highly insulating (if not doped), very good thermal conductors, and chemicallystable up to high temperatures. In addition, c-BN is very hard, and can be made semiconducting by doping with n- or p-type dopants.

* Information listed above is at the time of submission. *

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