Mechanical properties and oxidation resistance of MoSi2 and MoSi2-SiC by a spark plasma sintering process
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The MoSi2 and MoSi2-SiC were consolidated by a spark plasma sintering process to enhance their mechanical and oxidationresistance properties. The powders were quantified based on the phase diagram and milled using a high energy ball milling. The milled powders were sintered by a spark plasma sintering process at 1300 ℃ under 60 MPa and heating rate of 100 ℃/min. The crystallite size of MoSi2 and MoSi2-SiC, using diffraction patterns, were calculated 204.1 and 182.7 nm, respectively. The vickers hardness of MoSi2 and MoSi2-SiC are 841.0 and 1067.6 kg/mm2, respectively, and the fracture toughness valuesare 6.53 and 7.08 MPa·m1/2. The SiC present in the MoSi2 matrix enhanced the mechanical properties of the matrix andincreased the fracture toughness by reducing the length of crack propagation. The MoSi2 and MoSi2-SiC samples wereoxidized by heating to 1000 ℃ in an oxygen atmosphere. Additionally, the oxidation resistance properties were closelyinvestigated based on the presence of SiC, through the examination of any newly formed phases and the degree of oxygenpenetration into the sample surface.
Abstract
The MoSi2 and MoSi2-SiC were consolidated by a spark plasma sintering process to enhance their mechanical and oxidationresistance properties. The powders were quantified based on the phase diagram and milled using a high energy ball milling. The milled powders were sintered by a spark plasma sintering process at 1300 ℃ under 60 MPa and heating rate of 100 ℃/min. The crystallite size of MoSi2 and MoSi2-SiC, using diffraction patterns, were calculated 204.1 and 182.7 nm, respectively. The vickers hardness of MoSi2 and MoSi2-SiC are 841.0 and 1067.6 kg/mm2, respectively, and the fracture toughness valuesare 6.53 and 7.08 MPa·m1/2. The SiC present in the MoSi2 matrix enhanced the mechanical properties of the matrix andincreased the fracture toughness by reducing the length of crack propagation. The MoSi2 and MoSi2-SiC samples wereoxidized by heating to 1000 ℃ in an oxygen atmosphere. Additionally, the oxidation resistance properties were closelyinvestigated based on the presence of SiC, through the examination of any newly formed phases and the degree of oxygenpenetration into the sample surface.