Fundamentals of SHS-joining for ceramics, intermetallics and metals
Conference
·
OSTI ID:115435
The same process of self-propagating high-temperature synthesis (SHS) that allows production of a wide variety of refractory ceramics and intermetallics has also been successfully used for simultaneous net-shape production through a process that uses the exothermic heat of reaction to accomplish reactive sintering. Now the SHS process is being evaluated for its potential for joining similar or dissimilar combinations of heat-resisting or refractory metals, ceramics, or intermetallics. The process offers particular promise for the practical production of functionally gradient material joints and/or reinforced composite joints. The Gleeble thermal-mechanical simulation and test apparatus is being employed for the systematic evaluation of key parameters for SHS joining. Effects of reaction/processing temperature (500, 650, 1000, and 1300{degrees}C), hold time (2, 15, and 50 min), heating rate (0.5, 1.0 and 2.0{degrees}C/s), applied pressure (8.6, 41.4 and 82.7 MPa), and reactant composition (65Ni35AI and 80Ni20AI versus normal 75Ni25AI) on rate and degree of reaction, bond integrity, and filler density have been evaluated in a model system of Ni-base (IN600) end elements joined using the in-situ reaction of 3Ni + AI> Ni{sub 3}AI. Reaction atmosphere has been Ar, although future tests with vacuum and active gases will be conducted. For all temperatures above 650{degrees}C, where some liquid phase was formed in the AI-Ni phase diagram, bond integrity was good irrespective of heating rate, hold time, or applied pressure. The degree of reaction and product homogeneity were clearly dependent on temperature and hold time, with temperature having a much greater effect, as expected. Heating rate had little effect. Detailed studies of bonding mechanics and evaluation of joint properties are continuing, along with production of functionally gradient material joints between dissimilar materials.
- OSTI ID:
- 115435
- Report Number(s):
- CONF-9404233--
- Country of Publication:
- United States
- Language:
- English
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