Luan, Xin’gang ; Zou, Yun ; Hai, Xiaohu ; Bai, Hui ; Zhang, Qing ; Riedel, Ralf ; Cheng, Laifei (2018)
Degradation mechanisms of a self-healing SiC(f)/BN(i)/[SiC-B4C](m) composite at high temperature under different oxidizing atmospheres.
In: Journal of the European Ceramic Society, 38 (11)
doi: 10.1016/j.jeurceramsoc.2018.05.001
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Chemical vapor-infiltrated self-healing SiC(f)/BN(i)/[SiC-B4C](m) composite specimens were exposed at 1300 °C for 300 h at atmospheric pressure under two different oxidizing atmospheres (i.e., wet (12%H2O:8%O2:80%Ar) and dry (0.01%O2:99.99%Ar)) representative of rich and poor oxidizing conditions, respectively. Mechanical testing, microstructural observations, and element analyses were performed on the treated specimens. The flexural strength retentions of the specimens were 47.9 and 39.4% under wet and dry oxygen conditions, respectively. The SiC and B4C matrices were severely oxidized under wet oxygen conditions, whereas the BN interphase remained intact. The BN interphase and the B4C layered phase were both partially oxidized under dry oxygen conditions. Thus, the SiC(f)/BN(i)/[SiC-B4C](m) composites exhibited improved oxidation resistance under wet oxygen atmospheres as compared to dry oxygen conditions as a result of the formation of borosilicate glasses. In addition, two different degradation mechanisms for the composites during the oxidation process were discussed.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2018 |
| Autor(en): | Luan, Xin’gang ; Zou, Yun ; Hai, Xiaohu ; Bai, Hui ; Zhang, Qing ; Riedel, Ralf ; Cheng, Laifei |
| Art des Eintrags: | Bibliographie |
| Titel: | Degradation mechanisms of a self-healing SiC(f)/BN(i)/[SiC-B4C](m) composite at high temperature under different oxidizing atmospheres |
| Sprache: | Englisch |
| Publikationsjahr: | September 2018 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 38 |
| (Heft-)Nummer: | 11 |
| DOI: | 10.1016/j.jeurceramsoc.2018.05.001 |
| URL / URN: | https://doi.org/10.1016/j.jeurceramsoc.2018.05.001 |
| Kurzbeschreibung (Abstract): | Chemical vapor-infiltrated self-healing SiC(f)/BN(i)/[SiC-B4C](m) composite specimens were exposed at 1300 °C for 300 h at atmospheric pressure under two different oxidizing atmospheres (i.e., wet (12%H2O:8%O2:80%Ar) and dry (0.01%O2:99.99%Ar)) representative of rich and poor oxidizing conditions, respectively. Mechanical testing, microstructural observations, and element analyses were performed on the treated specimens. The flexural strength retentions of the specimens were 47.9 and 39.4% under wet and dry oxygen conditions, respectively. The SiC and B4C matrices were severely oxidized under wet oxygen conditions, whereas the BN interphase remained intact. The BN interphase and the B4C layered phase were both partially oxidized under dry oxygen conditions. Thus, the SiC(f)/BN(i)/[SiC-B4C](m) composites exhibited improved oxidation resistance under wet oxygen atmospheres as compared to dry oxygen conditions as a result of the formation of borosilicate glasses. In addition, two different degradation mechanisms for the composites during the oxidation process were discussed. |
| Freie Schlagworte: | SiC(f)/BN(i)/[SiC-B4C]((m)), Self -healing, Oxidation behavior, Degradation mechanism |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 12 Jul 2018 08:13 |
| Letzte Änderung: | 30 Jul 2018 05:47 |
| PPN: | |
| Sponsoren: | The authors acknowledge the financial supports from the Res. Fund of State Key Lab. of Solidification Processing (NWPU), China (Grant No. 135-QP-2015), the Nat. Key Techn. R&D Prog. (Grant No. 2017YFB0703200) and Fund. Res. Fund Centr.Univ. 3102017zy05. |
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