Effect of Reactant Particle Size on the Self-Propagating High-Temperature Synthesis Reaction Behaviors in the Ni-Ti-B4C System

Abstract

The effect of the reactant particle size on the self-propagating high-temperature synthesis (SHS) reaction behaviors in the Ni-Ti-B 4 C system was investigated in the present study. The B 4 C particle size has a significant effect on the ignition behavior and combustion wave velocity, while Ti and Ni particle sizes have only a limited influence. Increasing the B 4 C particle size retards the reaction initiation and remarkably lowers the combustion velocity and combustion temperature. The reaction products are mainly dependent on the B 4 C particle size. Nevertheless, decreasing Ni and Ti particle sizes is in favor of perfect products consisting of only TiC, TiB 2 , and Ni phases.

The effect of B4C particle size on the reaction process and product in the Cu–Zr–B4C system

“…9c and d). Yang et al [4] synthesized TiC and TiB 2 particles from the Ni-Ti-B 4 C system, and found that the B 4 C size greatly affected the conversion of SHS products. Munir and Anselmi-Tamburini [15] showed that the formation of metastable phases is based on the rapid cooling rate associated with the reactions.…”

“…9c and d). According to the XRD results of SHS products, the full conversion of ZrC and ZrB 2 cannot be achieved once the B 4 C particle size exceeds 28 m. The incomplete conversion will lead to a reduction in the heat released from SHS and the combustion temperature decreases [4]. Spontaneously, ZrC and ZrB 2 particle sizes are finer because the growth of grains is an exponential function of the combustion temperature [24].…”

“…Recently, the combustion synthesis of TiC-TiB 2 -based cermets from the Ti-B 4 C system with different metal additives has been extensively studied [4][5][6]. In contrast, reports related to ZrC-ZrB 2based ceramal prepared by the SHS method are relatively limited.…”

The effect of various Co contents on the microstructure and properties of Ti(C,N)-TiB2-Co cermets prepared in situ via reactive hot pressing

“…5,7,8 Studies by Yang et al. 9 and Xu et al. 6 show that the mechanical performance of Ti(C,N)-TiB 2 cermets are better than that of monolithic TiB 2 or Ti(C,N).…”

“…Therefore, the second-phase particles (such as TiB 2 , Al 2 O 3 , and Si 3 N 4 ) were added to improve the hardness of Ti(C, N)-based cermets. 5,7,8 Studies by Yang et al 9 and Xu et al 6 show that the mechanical performance of Ti(C, N)-TiB 2 cermets are better than that of monolithic TiB 2 or Ti(C,N). In general, Ti(C,N)-TiB 2 cermets are prepared using a two-step method, that is, TiB 2 and Ti are prepared first, and then mixed-sintering is used with specific proportions.…”