Welding with self-propagating high-temperature synthesis
- Rensselaer Polytechnic Institute, Troy, NY (United States)
Traditional welding processes generally serve well for joining traditional materials, largely dominated by metals and their alloys. The emergence and proliferation of advanced ceramics, intermetallics, metal-, ceramic- and intermetallic-matrix composites, as well as demand for hybrid structures containing dissimilar material joints to meet new, severe performance criteria, necessitates innovative new joining processes. Self-propagating high-temperature synthesis (SHS) or combustion synthesis (CS) welding seems to be just such a process. SHS offers many attractive features, some of which are quite unusual if not unique. First, the high temperatures needed to bond refractory materials can be achieved through internal heat generation rather than from external sources. This offers energy efficiency. Second, rapid and highly localized heat generation limits thermal disruption of heat-sensitive substrate microstructures. Third, chemical compatibility between the reaction products and substrate(s) is usually easy to achieve, as the process being used to produce the joint is often the same as the process that was or could have been used to produce the substrate(s). A fourth fairly unique feature SHS offers is that reinforcing phases in the form of particles, chopped fibers, or whiskers can be incorporated into the reactants and, thus, into the reaction product. And, finally in a fifth unusual feature, functionally gradient material (FGM) joints can be produced where the composition across the joint is varied from that of one substrate or end element to that of the other.
- OSTI ID:
- 119018
- Journal Information:
- Welding Journal, Journal Name: Welding Journal Journal Issue: 10 Vol. 74; ISSN 0043-2296; ISSN WEJUA3
- Country of Publication:
- United States
- Language:
- English
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