Influence of the W Content on the Characteristics of MoxW1−xSi2 Heating Elements Fabricated by Self-Propagating High-Temperature Synthesis
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MoSi2-based composites are promising structural materials for high-temperature applications. MoxW1−xSi2 (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 MoxW1−xSi2 composites, the surface morphologies, densities, and bending strengths of the MoxW1−xSi2 heating elements were investigated. Moreover, to validate the durability of the MoxW1−xSi2 heating elements, an accelerated degradation test (ADT) was conducted at temperatures up to 1700°C (heating rate = 5°C/min). The MoxW1−xSi2 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 MoxW1−xSi2 heating element with 0 mol% of W showed inferior durability owing to the formation of bubbles at the MoxW1−xSi2 /SiO2 interface. Thus, the addition of W enhances the reliability and durability of MoxW1−xSi2 composites as heating elements.
KeywordsMoxW1−xSi2 W content Self-propagating high-temperature synthesis Accelerated degradation test Bending strength
This present Research has been conducted by the Research Grant of Kwangwoon University in 2019. And, this work was supported by the National Research Foundation of Korea (NRF) funded by Korean government (MSIP; Ministry of Science, ICT and Future Planning) (Nos. 2017R1C1B5017013 and 2018R1D1A1B07045295).
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