Synthesis of AlNSiC composites and solid solutions by field-activated self-propagating combustion

Synthesis of tungsten carbide–cobalt composites by the field-activated combustion synthesis method

“…Experimental results and modeling studies have led to the conclusion that the effect of the field is to provide Joule heating at a rate of σE 2 , with σ being the conductivity and E the field [3][4][5]. Depending on the electric conductivity of reactants and products, ignition results in the initiation and propagation of a combustion wave in reactant systems, which heretofore could not be synthesized by SHS (without preheating), including SiC, SiC-AlN, B 4 C-TiB 2 , MoSi 2 -SiC, Ti 3 Al and others [6][7][8][9][10][11][12][13].…”

Field Activated Combustion Synthesis of Ceramic and Composite Materials

“…The common method of synthesis of the solid solutions is to heat mixtures of A1N and SiC (a or ß) to higher than about 2100°C for up to up to 16 hrs. With fieldactivation, solid solutions can be synthesized in seconds [4,5]. When forming composites, the composition of the phases depended on the magnitude of the applied field, and when forming solid solutions, the homogeneity (elemental distribution) was influenced by the strength of the field.…”

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

“…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). …”

“…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.…”