Study on High Temperature Oxidation Characteristics of NbTi Matrix Composites Reinforced with ZrB2 Particles

ABSTRACT

The oxidation behavior of NbTi matrix composite reinforced by ZrB₂ particles at 800°C-1200°C were investigated. The oxidation kinetic curves of five specimens with different ZrB₂ contents (0–60 wt. %) were obtained, and the phase and morphology of oxidized specimens were analyzed by XRD, SEM and EDS. The result showed that both temperature and ZrB₂ content have great influence on oxidation resistance of the NbTi-matrix composites. The main oxide was TiNb₂O₇ when ZrB₂ content was 15% and 30%. As the ZrB₂ content increased, Nb₂Zr₆O₁₇ was the predominant oxide. At 800°C and 1000°C, oxide rate reduced due to the formation of Nb₂Zr₆O₁₇. When temperature reached 1200°C, the volatilization of B₂O₃ caused many cracks and holes and weakened the protective effect of Nb₂Zr₆O₁₇.

KEYWORDS:

• NbTi
• ZrB₂
• high-temperature oxidation
• microstructure

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [11372110].