التفاصيل البيبلوغرافية
| العنوان: |
In-situsynthesis, microstructure, and properties of NbB2-NbC-Al2O3composite coatings by plasma spraying |
| المؤلفون: |
Wang, Xiaolong, Yang, Yong, Jia, Shitong, Wang, Yanwei, Ma, Yuduo, Cui, Yuhang, Wang, Xingyu, Sun, Wenwei, Wang, Liang |
| المصدر: |
Journal of Advanced Ceramics; 20220101, Issue: Preprints p1-16, 16p |
| مستخلص: |
The high melting point and strong chemical bonding of NbB2pose a great challenge to the preparation of high-density nanostructured NbB2composite coating. Herein, we report a novel, simple, and efficient method to fabricate in-situNbB2-NbC-Al2O3composite coating by plasma spraying Nb2O5-B4C-Al composite powder, aiming at realizing the higher densification and ultra-fine microstructure of NbB2composite coating. The microstructure and properties of in-situNbB2-NbC-Al2O3composite coating were studied comparatively with ex-situNbB2-NbC-Al2O3composite coating (plasma spraying NbB2-NbC-Al2O3composite powder). The reaction mechanism of Nb2O5-B4C-Al composite powder in plasma jet was analyzed in detail. The results showed that the in-situnanostructured NbB2-NbC-Al2O3composite coating presented a lower porosity and superior performance including higher microhardness, toughness and wear resistance compared to the plasma sprayed ex-situNbB2-NbC-Al2O3coating and other boride composite coatings. Densification of the in-situNbB2-NbC-Al2O3coating was attributed to the low melting point of Nb2O5-B4C-Al composite powder and the exothermic effect of in-situreaction. The superior performance was ascribed to the density improvement and the strengthening and toughening effect of the nanosized phases. The in-situreaction path could be expressed as: Nb2O5+ Al → Nb + Al2O3, and Nb + B4C → NbB2+ NbC. |
| قاعدة البيانات: |
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