High Temperature Oxidation Behaviors of BaO/TiO<sub>2</sub> Binary Oxide-Enhanced NiAl-Based Composites
High temperature lubricating composites have been widely used in aerospace and other high-tech industries. In the actual application process, high temperature oxidation resistance is a very importance parameter. In this paper, BaO/TiO<sub>2</sub>-enhanced NiAl-based composites were prepa...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/6676ca9ccc934f33a670b4945faa07a1 |
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| Sumario: | High temperature lubricating composites have been widely used in aerospace and other high-tech industries. In the actual application process, high temperature oxidation resistance is a very importance parameter. In this paper, BaO/TiO<sub>2</sub>-enhanced NiAl-based composites were prepared by vacuum hot-press sintering. The oxidation resistance performance of the composites at 800 °C was investigated. The composites exhibited very good sintered compactness and only a few pores were present. Meanwhile, the composite had excellent oxidation resistance properties due to the formation of a dense Al<sub>2</sub>O<sub>3</sub> layer which could prevent further oxidation of the internal substrate; its oxidation mechanism was mainly decided by the outward diffusion of Al and the inward diffusion of O. The addition of BaO/TiO<sub>2</sub> introduced more boundaries and made the K<sub>p</sub> value increase from 1.2 × 10<sup>−14</sup> g<sup>2</sup>/cm<sup>4</sup> s to 3.3 × 10<sup>−14</sup> g<sup>2</sup>/cm<sup>4</sup> s, leading to a slight reduction in the oxidation resistance performance of the composites—although it was still excellent. |
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