Effect of Molten Al/Si Impregnation on the Oxidation Resistance of TiB2 at 1300°C

Koki Wakatabi, Yuki Jimba, Yasuki Okuno, Sosuke Kondo, Hao Yu, Yasuyuki Ogino, Ryuta Kasada

Research output: Contribution to journalArticlepeer-review

Abstract

Despite their superior material properties at high temperatures, the poor oxidation resistance of borides such as TiB2 above 1000°C limits their applications. Herein, we demonstrate the liquid-phase impregnation of Al or Si into the sintered compact of TiB2 and study their effect on the oxidation behavior at 1300°C. The thermogravimetric curves obtained under oxidation and subsequent crystal phase identification suggest that Al impregnation can prevent the evaporation of boron oxide by forming aluminum borate, which is an unstable protective layer, resulting in a slight increase in the oxidation resistance. By contrast, the Si-impregnated specimens showed lesser mass change due to oxidation than that in the unimpregnated specimens, owing to the formation of a stable protective SiO2 phase on the sample surface. Hence, molten Si impregnation of sintered borides is a promising new approach for improving high-temperature oxidation resistance.

Original languageEnglish
Pages (from-to)1367-1372
Number of pages6
JournalMaterials Transactions
Volume65
Issue number10
DOIs
StatePublished - Oct 2024
Externally publishedYes

Funding

The authors thank Dr. Kiyohiro Yabuuchi and Dr. Keisuke Mukai for performing the EPMA and heat treatment, which was supported by the Joint Usage/Research Program on Zero-Emission Energy Research, Institute of Advanced Energy, Kyoto University (ZE2022A-02). This work was supported by GIMRT Proposals of the Cooperative Research and Development Center for Advanced Materials (202112-CRKEQ-0404). The authors thank Mr. Kotaro Seki, Mr. Nozomi Mizumoto, and Mr. Geng Diancheng for their fruitful discussions.

Keywords

  • boride
  • high-temperature oxidation
  • liquid-solid reactions

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