Microstructure and mechanical properties of hot-pressed ZrC–Ti–CNTs composites
Microstructure and mechanical properties of hot-pressed ZrC–Ti–CNTs composites
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DOI：
10.1016/j.matdes.2016.06.070
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发表时间：
2016-10
影响因子：
8.4
通讯作者：
Sha Jianjun;Jian Li;Shouhao Wang;Zhang Zhao-fu;Yongchang Wang;J. Dai
中科院分区：
文献类型：
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作者：
Sha Jianjun;Jian Li;Shouhao Wang;Zhang Zhao-fu;Yongchang Wang;J. Dai
掺杂20体积%的ZrC基陶瓷复合材料钛（Ti）和3体积%采用热压法制备了碳纳米管（CNTs）。研究了复合材料的致密化行为、组织演变和力学性能。结果表明，在降低烧结温度（1600 °C）的情况下，复合材料的烧结性能显着提高，得到了高致密的基体（98.27%）。复合材料中除（Zr，Ti）C主相外，还含有一定量的TiC，有利于力学性能的提高。结果，复合材料的弯曲强度在室温下测量为415 MPa，在800 °C下测量为647 MPa。此外，复合材料表现出5.27 MPa m1/2的高断裂韧性，提高了32%相比，整体式ZrC（4 MPa m1/2）。断裂韧性的提高主要归因于裂纹偏转、裂纹桥接和裂纹分支。
ZrC-based ceramic composites doped with 20 vol.% titanium (Ti) and 3 vol.% carbon nanotubes (CNTs) were prepared by hot pressing. The densification behavior, microstructural evolution and mechanical properties of the composites were studied. The results indicated that the sinterability of the composites was significantly improved, resulting in highly dense matrix (98.27%) at reduced sintering temperature (1600 °C). In addition to the main phase of (Zr, Ti)C, the composites also contained a certain amount of TiC, which was shown to be beneficial for the improvement of mechanical properties. As a result, the flexural strength of the composites was measured to be 415 MPa at room temperature and 647 MPa at 800 °C, respectively. Moreover, the composites showed a high fracture toughness of 5.27 MPa m1/2, which increased by 32% compared with the monolithic ZrC (4 MPa m1/2). The improved fracture toughness was attributed to crack deflection, crack bridging and crack branching.