GASAR porous metals process control
- Univ. of Arizona, Tucson, AZ (United States)
- Sandia National Labs., Albuquerque, NM (United States)
- California State Univ., Chico, CA (United States)
GASAR porous metals are produced by melting under a partial pressure of hydrogen and then casting into a mold that ensures directional solidification. Hydrogen is driven out of solution and usually grows as quasi-cylindrical pores normal to the solidification front. Experiments with pure nickel have been carried out under processing conditions of varying H{sub 2} partial pressure, total pressure (H{sub 2} + Ar), and superheat. An analysis that considers heterogeneous bubble nucleation was developed that identifies processing conditions in which hydrogen bubbles are stable in the liquid before solidification. It is hypothesized that these conditions lead to low porosity because these bubbles float out of the melt and escape the advancing solidification front. Experimental data are shown to support this hypothesis.
- Research Organization:
- Sandia National Laboratory
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 361832
- Report Number(s):
- CONF-980405--
- Country of Publication:
- United States
- Language:
- English
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