Formation of mineral phases in self-propagating high-temperature synthesis (SHS) of porous TiNi alloy

In situ synthesis mechanism of ZrC‐ZrB2/Cu composites prepared by SHS‐casting method

“…As shown, both porous and dense microstructures were formed. In general, SHS reaction will release an amount of gas, which led to the occurrence of pores . Subsequently, molten Cu infiltrated into the pores by capillary force.…”

Biocompatibility and Clinical Application of Porous TiNi Alloys Made by Self-Propagating High-Temperature Synthesis (SHS)

“…Notably, in the layer-by-layer combustion mode, the following processes are revealed in the reaction layer: (i) Origin of the eutectic liquid in the contact area of Ti and Ni particulates; (ii) dissolution of particulates in the eutectic liquid, which catalyzes a drastic increase of the eutectic liquid; (iii) exothermic reaction between dissolved reagents and successive crystallization of TiNi 3 , TiNi, and Ti 2 Ni precursors from the liquid; and (iv) interdiffusion migration of Ni atoms into solid Ti particulates and Ti atoms into solid Ni particulates, followed by the formation of intermetallic constituents [21,23,39,41].…”

“…Therefore, the matrix is rectified to a large extent, whereas the pore wall surfaces are concealed by the sophisticated shell. The given shell comprises amorphous-nanocrystalline phases of intermetallic oxycarbonitrides in the form of epitaxial strata (foamy onlay and dense bisubstrate), as reported in References [20,21]. Considering the chemical composition and structure, the shell can be classified as a cermet Ti 4 Ni 2 (O,N,C) layer [42,43,44].…”

“…The light microscope seemed to be a versatile instrument since it identified the massive superficial layer (S) concealing the sectioned matrix (M) in a dark field, as illustrated in Figure 2a [21]. Nonmetallic crystals (NM) can be distinguished in ultraviolet polarized light against both the matrix phase (M) and massive superficial layer (S), as depicted in Figure 2b.…”

“…Recently, porous SHS TiNi (PTN) compounds have been reported [20,21] to have some features which significantly distinguish PTNs from porous materials obtained by other methods of powder metallurgy using the same reactants [22,23,24]. It happens that the porous body formation during the SHS reaction is accompanied with the genesis of nonmetallics (titanites, spinels, perovskites, glass-ceramics, etc.)…”