Influence of the W Content on the Characteristics of MoxW1−xSi2 Heating Elements Fabricated by Self-Propagating High-Temperature Synthesis

• Published in: Electronic materials letters Vol. 15; no. 3; pp. 383 - 390
• Main Authors: Lee, Sung-Chul, Cho, Myung-Yeon, Lee, Dong-Won, Kim, Yong-Nam, Oh, Jong-Min, Kim, Bae-Yeon
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.05.2019; Springer Nature B.V; 대한금속·재료학회
• Subjects: Accelerated tests; Bend strength; Characterization and Evaluation of Materials; Characterization and Modeling; Chemistry and Materials Science; Composite materials; Condensed Matter Physics; Durability; Heating rate; High temperature; Materials Science; Molybdenum disilicides; Morphology; Nanotechnology; Nanotechnology and Microengineering; Optical and Electronic Materials; Original Article - Theory; Product design; Self propagating high temperature synthesis; Silicon dioxide; 전자/정보통신공학; Bending strength; Mo; Self-propagating high-temperature synthesis; Accelerated degradation test; Si; W; W content
• ISSN: 1738-8090; 2093-6788
• DOI: 10.1007/s13391-019-00131-0

MoSi 2 -based composites are promising structural materials for high-temperature applications. Mo x W 1−x Si 2 (x = 1, 0.9, 0.8, and 0.7) powders were successfully synthesized by self-propagating high-temperature synthesis. These powders were used to fabricate heating elements, which were then subjected to a post-annealing process to improve the structural quality. To determine the influence of the W content (0–30 mol%) on the characteristics of Mo x W 1−x Si 2 composites, the surface morphologies, densities, and bending strengths of the Mo x W 1−x Si 2 heating elements were investigated. Moreover, to validate the durability of the Mo x W 1−x Si 2 heating elements, an accelerated degradation test (ADT) was conducted at temperatures up to 1700°C (heating rate = 5°C/min). The Mo x W 1−x Si 2 heating element with 30 mol% of W exhibited a high density, a high bending strength, and superior durability after the ADT test. In contrast, the Mo x W 1−x Si 2 heating element with 0 mol% of W showed inferior durability owing to the formation of bubbles at the Mo x W 1−x Si 2 /SiO 2 interface. Thus, the addition of W enhances the reliability and durability of Mo x W 1−x Si 2 composites as heating elements. Graphical Abstract