Insight into the effect of Ti substitutions on the static oxidation behavior of (Hf,Ti)C at 2500 ​°C

Shiyan Chen; Zhaoke Chen; Jinming Wang; Yi Zeng; Weilong Song; Xiang Xiong; Xingchao Li; Tongqi Li; Yichen Wang

Advanced Powder Materials (Apr 2024)

Insight into the effect of Ti substitutions on the static oxidation behavior of (Hf,Ti)C at 2500 °C

Shiyan Chen,
Zhaoke Chen,
Jinming Wang,
Yi Zeng,
Weilong Song,
Xiang Xiong,
Xingchao Li,
Tongqi Li,
Yichen Wang

Affiliations

Shiyan Chen: State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Zhaoke Chen: State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; Corresponding author.
Jinming Wang: Aerospace Research Institute of Materials & Processing Technology, China Academy of Launch Vehicle Technology, Beijing 100076, China
Yi Zeng: State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Weilong Song: State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Xiang Xiong: State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; Corresponding author.
Xingchao Li: Aerospace Research Institute of Materials & Processing Technology, China Academy of Launch Vehicle Technology, Beijing 100076, China
Tongqi Li: Aerospace Research Institute of Materials & Processing Technology, China Academy of Launch Vehicle Technology, Beijing 100076, China
Yichen Wang: State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Journal volume & issue: Vol. 3, no. 2
p. 100168

Abstract

Read online

Hf-based carbides are highly desirable candidate materials for oxidizing environments above 2000 °C. However, the static oxidation behavior at their potential service temperatures remains unclear. To fill this gap, the static oxidation behavior of (Hf, Ti)C and the effect of Ti substitutions were investigated in air at 2500 °C under an oxygen partial pressure of 4.2 kPa. After oxidation for 2000 s, the thickness of the oxide layer on the surface of (Hf, Ti)C bulk ceramic is reduced by 62.29 % compared with that on the HfC monocarbide surface. The dramatic improvement in oxidation resistance is attributed to the unique oxide layer structure consisting of various crystalline oxycarbides, HfO2, and carbon. The Ti-rich oxycarbide ((Ti, Hf)CxOy) dispersed within HfO2 formed the major structure of the oxide layer. A coherent boundary with lattice distortion existed at the HfO2/(Ti, Hf)CxOy interface along the (111) crystal plane direction, which served as an effective oxygen diffusion barrier. The Hf-rich oxycarbide ((Hf, Ti)CxOy) together with (Ti, Hf)CxOy, HfO2, and precipitated carbon constituted a dense transition layer, ensuring favorable bonding between the oxide layer and the matrix. The Ti content affects the oxidation resistance of (Hf, Ti)C by determining the oxide layer's phase distribution and integrity.

Published in Advanced Powder Materials

ISSN: 2772-834X (Online)
Publisher: KeAi Communications Co. Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/advanced-powder-materials/

About the journal

Abstract

Keywords