Metal Digital Direct Manufacturing (MDDM) for Close-Out of Combustion Chambers and Nozzle Fabrications

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX17CM02C
Agency Tracking Number: 150059
Amount: $747,544.00
Phase: Phase II
Program: STTR
Awards Year: 2017
Solicitation Year: 2015
Solicitation Topic Code: T12.04
Solicitation Number: N/A
Small Business Information
664 Northwest Enterprise Drive, Suite 118, Port Saint Lucie, FL, 34986-2296
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Bryant Walker
 Principal Investigator
 (772) 343-7544
Business Contact
 Paul Nassar
Title: CFO
Phone: (772) 209-0125
Research Institution
 University of Alabama in Hunstville
 Gloria Greene
 301 Sparkman Drive
Huntsville, AL, 35899-0001
 (256) 824-2657
 Domestic nonprofit research organization
This NASA sponsored STTR project will investigate methods for close-out of large, liquid rocket engine, nickel or stainless steel nozzle, coolant channels utilizing robotic laser and pulsed-arc additive manufacturing (AM)methods. Structural jacket to coolant channel land area interface strength will be quantified and metallurgical characterization completed. Process optimizations will be conducted to select best deposition parameters and starting feed stock for the AM processes based on article pressure drop and pressure testing. Sub-scale and intermediate size nozzles will be fabricated using the hybrid Metal Digital Direct Manufacturing (MDDM) processes and delivered to the NASA-MSFC for hot fire testing. Value stream analysis and process cost modeling methods will be used to estimate nozzle should costs and to identify relative economic risk of each nozzle AM operation.

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

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