| AVS 64th International Symposium & Exhibition | |
| Manufacturing Science and Technology Group | Thursday Sessions |
| Session MS-ThM |
| Session: | Additive and Other Novel Manufacturing Techniques |
| Presenter: | Ronald Goeke, Sandia National Laboratories |
| Authors: | R.S. Goeke, Sandia National Laboratories C.A. Walker, Sandia National Laboratories P. Sarobol, Sandia National Laboratories P.T. Vianco, Sandia National Laboratories |
| Correspondent: | Click to Email |
Active brazing is a permanent metallurgical joining method in which highly reactive brazing filler metals are utilized to directly braze metals to nonmetals. Due to limitations of the active brazing filler metal spreading adequately over a nonmetal surface, the filler metal must be preplaced between the two faying surfaces of the brazement. When heated the liquid filler metal is normally contained within the brazement by capillary attraction. Chemical reactions at the brazement faying surfaces often lead to excessive braze filler metal flow, rendering the brazed assembly useless. Conformal coatings nanometers thick, deposited by atomic layer deposition (ALD) onto the metal surfaces, modify the surface chemistry to eliminate excessive filler metal flow. Unlike other means used to prevent excessive filler metal flow, the thin ALD coating does not hinder next assembly processes, does not require post-braze cleaning or alter the base material mechanical properties.
Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.