Mechanical and thermal properties and microstructural evolution of Ta-doped Nb4AlC3
文献类型：期刊论文
| 作者 | Cai, Ping; He, Qiming; Yang, Lihui; Huang, Zhengren; Liu, Xuejian; Yin, Jie; Huang, Yihua |
| 刊名 | CERAMICS INTERNATIONAL
 |
| 出版日期 | 2019-06-01 |
| 卷号 | 45期号:8页码:9799 |
| ISSN号 | 0272-8842 |
| 关键词 | Ta-doped Nb4AlC3 Solid solution Phase composition Mechanical and thermal properties Microstructural evolution |
| DOI | 10.1016/j.ceramint.2019.02.017 |
| 文献子类 | Article |
| 英文摘要 | (Nb1-xTax)(4)AlC3 (x = 0-0.5) ceramics were prepared by the hot press sintering method. The XRD results show that the second phase (Nb1-xTax)C is formed when the Ta content increases to 25 mol%. The SEM micrographs show that (Nb1-xTax)C has a core/rim structure, whose formation mechanism was also investigated. Substituting some Ta for Nb can significantly improve the mechanical properties of Nb4AlC3. (Nb0.75Ta0.25)(4)AlC3 exhibits an excellent fracture toughness of 8.3 +/- 0.3 MPa m(1/2) at room temperature (RT). The highest Young's modulus (349 +/- 16 GPa) and Vickers hardness (4.5 +/- 0.3 GPa) at RT are exhibited by the (Nb0.5Ta0.5)(4)AlC3 sample, which correlate to increases of 18% and 80%, respectively, compared with those of Nb4AlC3. The flexural strengths of (Nb0.5Ta0.5)(4)AlC3 are 439 +/- 18 MPa at RT and 344 +/- 22 MPa at 1100 degrees C, which correlate to increases of 27% and 45%, respectively, compared with those of Nb4AlC3. The solid solution of Ta and the formation of (Nb1-xTax)C are beneficial to the strengthening of Nb4AlC3. The coefficient of thermal expansion (CTE) increases slightly from 7.08 x 10(-6) K-1 for Nb4AlC3 to 7.24 x 10(-6) K-1 for (Nb0.75Ta0.25)(4)AlC3 at 25-1400 degrees C. The thermal conductivity of (Nb0.75Ta0.25)(4)AlC3 (28.4-29.8 W/m.K) is higher than that of Nb4AlC3 (18.1-21.2 W/m.K) over the whole test range (25-1000 degrees C). Owing to their excellent mechanical and thermal properties, Ta-doped Nb4AlC3 ceramics have good potential as structural materials. |
| WOS研究方向 | Materials Science |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://ir.sic.ac.cn/handle/331005/27091]  |
| 专题 | 中国科学院上海硅酸盐研究所 |
| 推荐引用方式 GB/T 7714 | Cai, Ping,He, Qiming,Yang, Lihui,et al. Mechanical and thermal properties and microstructural evolution of Ta-doped Nb4AlC3[J]. CERAMICS INTERNATIONAL,2019,45(8):9799. |
| APA | Cai, Ping.,He, Qiming.,Yang, Lihui.,Huang, Zhengren.,Liu, Xuejian.,...&Huang, Yihua.(2019).Mechanical and thermal properties and microstructural evolution of Ta-doped Nb4AlC3.CERAMICS INTERNATIONAL,45(8),9799. |
| MLA | Cai, Ping,et al."Mechanical and thermal properties and microstructural evolution of Ta-doped Nb4AlC3".CERAMICS INTERNATIONAL 45.8(2019):9799. |
入库方式： OAI收割
来源：上海硅酸盐研究所
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