Self-propagating high-temperature synthesis as a process for joining materials
- Rensselaer Polytechnic Inst., Troy, NY (United States)
Self-propagating high-temperature synthesis or SHS is a process that allows production of a wide variety of ceramic and intermetallic compounds by highly exothermic reactions. It has been successfully used for simultaneous net-shape production, as well as joining, albeit the process of joining is in an embryonic state of understanding. In this study, the Gleeble{reg_sign} was employed for the systematic evaluation of the effects of heating rate (0.5 to 2 C/s), processing temperature (500 to 1,300 C), hold time (2 to 60 min), and applied pressure (8.8 to 82.7 MPa), as well as minor variations of reactant composition, on the degree of reaction, joining integrity, and filler metal density and homogeneity in a model system of 3Ni + Al > Ni{sub 3}Al reacted in situ between Alloy 600 end elements. For all temperatures above the reaction ignition temperature (T{sub i}), where a liquid phase is formed (639.9 C), joining integrity was good. The degree of reaction, as well as product homogeneity and density, were all increased most by increased processing temperatures, with more modest effects from longer hold times and higher applied pressures. Heating rate had no apparent effect, although the range was narrow. Composition around the perfect stoichiometric ratio had a modest effect on density.
- OSTI ID:
- 218530
- Journal Information:
- Welding Journal, Journal Name: Welding Journal Journal Issue: 3 Vol. 75; ISSN 0043-2296; ISSN WEJUA3
- Country of Publication:
- United States
- Language:
- English
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