Synthesis of dense WSi2 and WSi2-xvol.%SiC composites by high-frequency induction heated combustion and its mechanical properties

Abstract

A method to synthesize the dense silicide WSi2 and WSi2-xvol.%SiC composites within two minutes in one step from W, Si and C elemental powders was investigated. Simultaneous combustion synthesis and densification were carried out under the combined effect of an induced current and mechanical pressure. Highly dense WSi2 and WSi2-xvol.%SiC (x = 10, 20, 30) with relative density of up to 97 % were produced under the simultaneous application of a 60 MPa pressure and the induced current on the reactant powders. The average grain size of WSi2 in WSi2-xvol.%SiC (x = 0, 10, 20, 30) were in the region of 6.9, 6.1, 5.2, and 5.0 Pm, respectively. The respective Vickers hardness values for these materials were 1375, 1540, 1710, and 1845 kg/mm 2 . From indentation crack measurements, the fracture toughness values were calculated to be 3.3, 3.8, 4.4, and 5.1 MPa·m 1/2 , respectively.

A high entropy silicide by reactive spark plasma sintering

“…The Young's modulus and Poisson's ratio of the as-manufactured HES ceramic are 352 GPa and 0.32 respectively, and the measured Vickers hardness (Hv) is 12.09 GPa. The hardness seems to be in the range between upper and lower bound of reported values of the disilicides by different researchers [4,[26][27][28][29][30]. For example, the Vickers hardness of MoSi 2 [27], NbSi 2 [28], WSi 2 [29], and TiSi 2 [30] are 10.5, 8.76, 13.75, and 8-10 GPa, respectively.…”

“…The hardness seems to be in the range between upper and lower bound of reported values of the disilicides by different researchers [4,[26][27][28][29][30]. For example, the Vickers hardness of MoSi 2 [27], NbSi 2 [28], WSi 2 [29], and TiSi 2 [30] are 10.5, 8.76, 13.75, and 8-10 GPa, respectively. For some metalsilicon binary systems such as ZrSi, there exist several silicides with different elemental ratios of Zr to Si, and it is difficult to prepare a mono-phase material [31], making it difficult to evaluate properties of these phases.…”

Rapid consolidation of nanostructured FeAl compound by high frequency induction heating and its mechanical properties

“…SHS refer to a process in which materials with a sufficiently high heat of formation are synthesized in a combustion wave, which after ignition, spontaneously propagates throughout the reactants and converts them into the products [4]. The main advantages are the low processing cost, high purity, energy and time efficient, and a wide variety of materials, such as borides, carbides, intermetallics and composites that have been produced by this method [5][6][7]. Nanocrystalline materials have received much attention as advanced engineering materials with improved physical and mechanical properties [8,9].…”

Rapid sintering of nanocrystalline 8 mol.%Y2O3-stabilized ZrO2 by high-frequency induction heating method

“…During HFIHS, a huge induction current is induced in the sample and in the graphite die. As a result, the sample can be sintered uniformly and rapidly from both inside and outside [18][19][20][21][22]. Thus, the HFIHS method is considered suitable for the fabrication of YSZ materials by using nanocrystalline 8 mol.%Y 2 O 3 -ZrO 2 powder.…”

“…High-frequency induction heating sintering (HFIHS) is a new rapid sintering method, which was developed recently for the fabrication of ceramics and composites [18][19][20][21][22]. This method enables the combination of short time high-temperature exposure with pressure application.…”