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Microstructure and mechanical properties of Zr 3 Al 3 C 5 -based ceramics synthesized by Al-Si melt infiltration
Journal of Advanced Ceramics ( IF 18.6 ) Pub Date : 2021-04-15 , DOI: 10.1007/s40145-020-0455-9
Xiaomeng Fan , Yuzhao Ma , Yangfang Deng , Jinxue Ding , Laifei Cheng

In this work, bulk Zr3Al3C5-based ceramics were synthesized by the infiltration of Al-Si melt into zirconium carbide (ZrC) perform. The phase composition, microstructure, and mechanical properties of as-fabricated ceramics were studied. The results demonstrate that Si is more effective to reduce the twin boundary energy of ZrC than Al, and thus promotes the decrease of formation temperature of Zr3Al3C5. With the infiltration temperatures increasing from 1200 to 1500 °C, the Zr3Al3C5 content increases from 10 to 49 vol%, which is contributed to the increase of flexural strength from 62±9 to 222±10 MPa, and fracture toughness (KIC) from 2.8±0.2 to 4.1±0.3 MPa·m1/2. The decrease of mechanical properties for the samples fabricated at 1600 °C is ascribed to the abnormal growth of Zr3Al3C5 grains.



中文翻译:

Al-Si熔渗法合成Zr 3 Al 3 C 5基陶瓷的微观结构和力学性能

在这项工作中,通过将Al-Si熔体渗入碳化锆(ZrC)中来合成块状Zr 3 Al 3 C 5基陶瓷。研究了陶瓷的相组成,显微组织和力学性能。结果表明,Si比Al更有效地降低ZrC的孪生边界能,从而促进了Zr 3 Al 3 C 5的形成温度的降低。随着渗透温度从1200°C升高到1500°C,Zr 3 Al 3 C 5含量从10vol%增加到49vol%,这有助于弯曲强度从62±9增加到222±10 MPa,断裂韧性(K IC)从2.8±0.2增加到4.1±0.3 MPa·m 1/2。Zr 3 Al 3 C 5晶粒的异常生长归因于在1600°C下制造的样品的机械性能下降。

更新日期:2021-04-15
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