Combustion synthesis in the Ti-C-Ni-Mo system. Part 2: Analysis
- Univ. of California, San Diego, CA (United States). Dept. of Applied Mechanics and Engineering Sciences
Combustion-wave arrest experiments provide the means of greater understanding of the physical phenomena which occur during the propagation of a combustion wave within a Ti-C-Ni-Mo powder mixture. The apparent activation energy for the process (E {approx} 120{+-}40 kJ/mol) and the observations reported in the companion article indicate that the rate-limiting step in the reaction between Ti and C is the dissolution of C into the Ti-Ni-C melt. Temperature profile analysis indicates that the 2 {micro}m C flakes are completely consumed within approximately 0.2 seconds. The formation of TiC{sub x} spherules and their subsequent detachment is explained in terms of compressive stress established in the growing TiC{sub x} layer on the C particle. The compressive stresses are estimated to exceed 1 GPa, and an energy balance analysis predicts the formation of spherules for layer thicknesses on the order of 1 {micro}m, consistent with the experimental results.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 131485
- Journal Information:
- Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 11 Vol. 26; ISSN 0360-2133; ISSN MTTABN
- Country of Publication:
- United States
- Language:
- English
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