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Application of the RIT Model to Mateiral Selection for Zero Erosion Throats for Rockets Firing Aluminized Propellants

Award Information
Agency: Department of Defense
Branch: Missile Defense Agency
Contract: N00178-02-C-2036
Agency Tracking Number: 02-1053
Amount: $70,000.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Solicitation Year: N/A
Award Year: 2002
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
Suite 7400, 7606 Miramar Road
San Diego, CA 92126
United States
DUNS: 192116440
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Norbert Elsner
 (858) 695-6660
Business Contact
 Norert Elsner
Title: President
Phone: (858) 695-6660
Email: info@hi-z.,com
Research Institution

"The erosion of four transition metal carbides in a 6100F rocket nozzle test has been correlated with predicted thermochemical reactions with the alumina formed by an aluminized propellant. Correlation with the reaction initiation temperature model (RITmodel) will permit improved compositions to be predicted. Extension of the model to both lower and higher alulminized propellants, longer firing times, higher chamber pressures and to the onset of cavitation loss is needed before the model can be usedmost effectively.Current design of throats for 21% aluminized propellants use massive tungsten inserts to conduct the heat away to maintain a surface temperature below the melting point of tungsten at 6170F. This restriction is removed with carbides that often melt above7000F. Replacement of tungsten (density 0,7 lbs/inch^3) wuth niobium carbide plus graphite could reduce the weight of the Mark 104 nozzle from 43 to 32 lbs, as well as allow an increase to 6500F flame temperatures.Establishment of the RIT model will permit clean sheet nozzle designs to be made, will permit higher aluminized propellants to be used for longer firing times, and will reduce both weight and cost compared with nozzles using tungsten inserts. In additionto the prediction of improved compositions to allow higher temperatures, longer times and higher pressures, the program will lead to better understanding of reacitons at the throat. Understanding often lends to im

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

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