SiC-IrSi3 for High Oxidation Resistance

Abstract

SiC is a material with excellent mechanical and thermal properties but with a high production cost. Obtaining SiC by reactive infiltration is an attractive method with a much lower cost than the traditional sintering process. However, the reactive infiltration process presents a serious problem, which is the high residual silicon content, which decreases its applicability. The replacement of silicon with silicides is a widely used alternative. The present investigation shows the good mechanical properties of the SiC-IrSi3 composite material obtained by reactive infiltration of SiC-C preforms with Ir–Si alloys. The thermomechanical analysis shows a high compatibility of silicide with SiC. The presence of the silicide shows a substantial improvement against the oxidation of the SiC-Si composites.

Design of Composites by Infiltration Process: A Case Study of Liquid Ir-Si Alloy/SiC Systems

“…On the contrary, the modelling of non-reactive infiltration is possible if the model-predicted thermophysical properties and/or the corre-sponding literature data are available. Non-reactive infiltration of liquid alloys in contact with porous metallic or ceramic substrates, as the processing route or the processing step, is widely used to produce metal (Me1)/metal (Me2) and metal/ceramic composites [10][11][12][13]. Indeed, taking into account a miscibility gap that characterises Me1/Me2 monotectic metallic systems, Eremenko and Lesnik have performed combined experimental-theoretical investigation of non-reactive infiltration of the Ag/Ni, Ag/Fe, Pb/Ag, Pb/Ni and Pb/Fe systems [49].…”

“…Indeed, among Ir-Si intermetallic compounds, Ir 3 Si 5 is a wide-gap semiconductor, while when doped with another transition metal, it may be suitable for use at high temperatures [1,4,7]. Other potential applications of metallic silicides are their use as structural materials in aggressive environments [9] or as infiltrants in the manufacturing of composites via infiltration [10][11][12][13]. Binary Ir-X (X = Ti, Ta, Nb, Hf, Zr, and V) and Ir-Nb-Si ternary refractory superalloys provide a wider operating temperature range, i.e., up to 300 K higher with respect to that of Ni-based alloys as well as better mechanical properties; therefore, these alloys can be used for ultra-high-temperature applications [14,15].…”

Design of Composites by Infiltration Process: A Case Study of Liquid Ir-Si Alloy/SiC Systems

“…On the contrary, the modelling of non-reactive infiltration is possible if the model predicted thermophysical properties and/or the corresponding literature data are available. Non-reactive infiltration of liquid alloys in contact with porous metallic or ceramic substrates, as the processing route or the processing step, is widely used to produce metal (Me1)/metal (Me2) and metal/ceramic composites [10][11][12][13]. Indeed, taking into account a miscibility gap that characterises Me1/Me2 monotectic metallic systems, Eremenko and Lesnik have performed combined experimental-theoretical investigation of non-reactive infiltration of the Ag/Ni, Ag/Fe, Pb/Ag, Pb/Ni and Pb/Fe systems [49].…”

“…Investigating Si and Si-based alloys in contact with various carbon preforms many authors have considered non-reactive infiltration as an initial step of reactive infiltration processes [10][11][12][13][50][51][52]. The wetting of carbon by liquid Si and its alloys, followed by the reaction between Si and C, lead to the formation of SiC by so-called reaction-bonded silicon carbide process [9,12,50].…”

“…Indeed, among Ir-Si intermetallic compounds, 3 5 is a wide-gap semiconductor, while when doped with another transition metal it may be suitable for the use at high temperatures [1,4,7]. Other potential applications of metallic silicides are their use as structural materials in aggressive environments [9] or as infiltrants in the manufacturing of composites via infiltration [10][11][12][13]. Binary Ir-X (X = Ti, Ta, Nb, Hf, Zr, and V) and Ir-Nb-Si ternary refractory superalloys provide a wider operating temperature range, i.e.…”