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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2012005227
pages 365-395

COMBUSTION SYNTHESIS OF ADVANCED CERAMICS, INTERMETALLICS, AND COMPOSITES

Chun-Liang Yeh
Department of Aerospace and Systems Engineering, Feng Chia University, 100 Wenhwa Rd., Seatwen, Taichung 40724, Taiwan

RÉSUMÉ

Self-propagating high-temperature synthesis (SHS) takes advantage of the self-sustaining merit from highly exothermic reactions and has the potential of energy and time savings. This study adopts TiC as an additive to enhance the combustion synthesis of Ti3AlC2 and Ti2AlC; incorporates the thermite reaction into the SHS process for the formation of Nb3Al, Nb2Al, and NbAl3; and utilizes boron nitride (BN) as the solid source of nitrogen to facilitate the production of TiB2−TiN composites. The addition of TiC into the Ti/Al/C compacts caused a decrease in combustion temperature and flame-front velocity. However, the yield of Ti3AlC2 was enhanced by adopting TiC in the reactant mixture. The product with optimal compositions of 84.6% Ti3AlC2, 9.8% TiC, and 5.6% Ti2AlC by weight was obtained from the 20 mol%TiC-added sample. For the Ti2AlC formation, the 14.3 mol% TiC-added sample showed an increase in the production of Ti2AlC up to 90 wt%. Preparation of niobium aluminides was achieved by the thermite-based SHS process from the powder compacts with a molar ratio of Al/Nb2O5 = 4.0−6.67. Due to a decrease in the reaction exothermicity, the flame velocity and combustion temperature were declined by increasing Al in the reactant mixture. Nb3Al and Nb2Al were obtained from the samples of Al:Nb2O5 = 12:3 and 13:3, respectively. Nb2Al−NbAl3 composites were produced from the samples with Al/Nb2O5 between 5.0 and 6.67. With the use of TiN as a diluent and BN as a reactant, TiN−TiB2 composites with the TiB2 content from 12.5 to 25 mol% were produced at 0.62−1.14 MPa of nitrogen. The TiN−33.3 mol% TiB2 composite was synthesized from the 1.5Ti + BN sample in Ar.


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