Articles
  • Mechanical properties and oxidation resistance of MoSi2 and MoSi2-SiC by a spark plasma sintering process

  • Min-hyeok Yanga,b, Bum-soon Parka,b, Yu-gyun Parka,b, Ik-hyun Oha and Hyun-kuk Parka,*

  • aPurpose Built mobility group, Korea Institute of Industrial technology, Gwangju 61012, Republic of Korea
    bDivision of Advanced Materials Engineering, Chonnam National University, Gwangju 61186, Republic of Korea

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The MoSi2 and MoSi2-SiC were consolidated by a spark plasma sintering process to enhance their mechanical and oxidation resistance 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 values are 6.53 and 7.08 MPa·m1/2. The SiC present in the MoSi2 matrix enhanced the mechanical properties of the matrix and increased the fracture toughness by reducing the length of crack propagation. The MoSi2 and MoSi2-SiC samples were oxidized by heating to 1000 ℃ in an oxygen atmosphere. Additionally, the oxidation resistance properties were closely investigated based on the presence of SiC, through the examination of any newly formed phases and the degree of oxygen penetration into the sample surface.


Keywords: MoSi2, SiC, Spark plasma sintering, Mechanical properties, Oxidation behavior.

This Article

  • 2025; 26(1): 51-57

    Published on Feb 28, 2025

  • 10.36410/jcpr.2025.26.1.51
  • Received on Sep 11, 2024
  • Revised on Oct 30, 2024
  • Accepted on Oct 31, 2024

Correspondence to

  • Hyun-kuk Park

  • Purpose Built mobility group, Korea Institute of Industrial technology, Gwangju 61012, Republic of Korea
    Tel : +82-62-600-6270 Fax: +82-62-600-6149

  • E-mail: hk-park@kitech.re.kr