Modeling of reactive atomization and deposition processing of Ni3Al
1994; Elsevier BV; Volume: 42; Issue: 10 Linguagem: Inglês
10.1016/0956-7151(94)90460-x
ISSN1873-2879
AutoresHuimin Liu, R.H. Rangel, Enrique J. Laverna,
Tópico(s)High-Temperature Coating Behaviors
ResumoA recently developed processing technique for the synthesis of dispersion strengthened materials, reactive atomization and deposition (RAD), is introduced in the present paper. The unsteady state momentum, heat and mass transfer phenomena, including chemical reaction and phase change during RAD processing of molten Ni3Al droplets with a N2O2 gas mixture, are numerically investigated. The effects of oxygen concentration in the atomization gas on gas characteristics, such as the compressibility of gas and heat-transfer coefficient, and on droplet characteristics, such as velocity, temperature, undercooling, cooling rate, and solidification history are determined. The surface cooling of droplets is simulated using a modified Newton's law of cooling. This improvement results in a good agreement between the calculated results and experimental measurements.
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