Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of SiC and WC additon on Oxidation Behavior of Spark-Plasma-Sintered ZrB2

  • Kim, Chang-Yeoul (Nano- Material and Process Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Choi, Jae-Seok (Dept. of Material Sci. & Eng. Hanyang University) ;
  • Choi, Sung-Churl (Dept. of Material Sci. & Eng. Hanyang University)
  • Received : 2019.11.06
  • Accepted : 2019.12.23
  • Published : 2019.12.28
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Abstract

ZrB2 ceramic and ZrB2 ceramic composites with the addition of SiC, WC, and SiC/WC are successfully synthesized by a spark plasma sintering method. During high-temperature oxidation, SiC additive form a SiO2 amorphous outer scale layer and SiC-deplete ZrO2 scale layer, which decrease the oxidation rate. WC addition forms WO3 during the oxidation process to result in a ZrO2/WO3 liquid sintering layer, which is known to improve the anti-oxidation effect. The addition of SiC and WC to ZrB2 reduces the oxygen effective diffusivity by one-fifth of that of ZrB2. The addition of both SiC and WC shows the formation of a SiO2 outer dense glass layer and ZrO2/WO3 layer so that the anti-oxidation effect is improved three times as much as that of ZrB2. Therefore, SiC- and WC-added ZrB2 has a lower two-order oxygen effective diffusivity than ZrB2; it improves the anti-oxidation performance 3 times as much as that of ZrB2.

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