Extending the compositional limit of combustion-synthesized B4C-TiB2 composites by field activation

Xue, H.; Munir, Zuhair A.

doi:10.1007/bf02914912

Cited by 31 publications

(14 citation statements)

References 8 publications

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“…The corresponding postulated transformation zones are summarized in Table 1(d) (Xue and Munir, 1996a). It is apparent that the synthesis of this composite occurs through two sequential reactive steps.…”

Section: Discussionmentioning

confidence: 99%

“…The final goal will be the possibility to predict the microstructure of final products so that to synthesize materials with tailored properties using the FACS method, whose advantages over conventional techniques are reported in the literature (cf. Feng and Munir, 1995a;Xue and Munir, 1996a;Xue and Munir, 1996b;Xue and Munir, 1997;Gedevanishvili and Munir, 1998;Orrù et al, 1999b). …”

Section: Discussionmentioning

confidence: 99%

“…XRD analyses results of the unreacted (Region 1), combustion (Region 2) and reacted (Region 3) zones of quenched samples obtained during FACS of B 4 C-TiB 2 are shown in Figures 6 (Xue and Munir, 1996a). Region 1 contained the reactant elements only.…”

Section: Previous Experimental Observationsmentioning

confidence: 99%

“…In the first part, we discuss previously published experimental results obtained during the FACS of b-SiC, TaC, Ti 3 Al and B 4 C-TiB 2 from elemental powders (Feng and Munir, 1995a;Xue and Munir, 1996a;Xue and Munir, 1996b;Orrù et al, 1999c). It should be noted that b-SiC and Ti 3 Al are characterized by an adiabatic temperature less than 2000 K and thus the occurrence of a self-propagating reaction is thermodynamically limited.…”

Section: Introductionmentioning

confidence: 96%

“…Through this method, referred to in the literature as FACS (Field-Assisted Combustion Synthesis), the synthesis of materials heretofore not possible by normal SHS (e.g., SiC, SiC-AlN, TaC, B 4 C-TiB 2 , MoSi 2 -SiC, and Ti 3 Al) was successfully demonstrated (cf. Feng and Munir, 1995a;Xue and Munir, 1996a;Xue and Munir, 1996b;Xue and Munir, 1997;Gedevanishvili and Munir, 1998;Orrù et al, 1999b). SHS and FACS processes are typically characterized by high temperatures (up to about 3500 K), reaction waves which propagate at relatively high speeds (up to 25 cm/s), and low energy requirements, etc.…”

Section: Introductionmentioning

confidence: 99%

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Mechanistic investigation of electric field-activated self-propagating reactions: experimental and modeling studies

Orrù

Cincotti

Cao

et al. 2001

Chemical Engineering Science

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The mechanism of electric field-activated self-propagating reactions is investigated using the combustion front quenching technique. In particular, previously published experimental results obtained through the Field Assisted Combustion Synthesis (FACS) of b-SiC, TaC, Ti 3 Al and B 4 C-TiB 2 are re-examined and compared. Pre-combustion and combustion stages involved during synthesis wave propagation are postulated for all systems. Subsequently, modeling results aimed at simulating the process where an electric field-activated self-propagating reaction takes place are presented. In particular, a one-dimensional model of FACS technique is developed to simulate the rapid quenching of the reaction during its progress as the applied field is turned off. A rate expression which accounts for the influence of temperature, particle size, compaction density, reactant stoichiometry, and inert content is included in the model.

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Section: Discussionmentioning

confidence: 99%