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Effect of Carbon Nanotubes on Microstructure and Fracture Toughness of Nanostructured Oxide Ceramics
Russian Physics Journal ( IF 0.6 ) Pub Date : 2021-07-16 , DOI: 10.1007/s11182-021-02342-1
Yu. A. Mirovoy 1 , A. G. Burlachenko 1 , A. S. Buyakov 1 , E. S. Dedova 1 , S. P. Buyakova 1
Affiliation  

The structure and properties of the yttria-stabilized zirconia ceramics with an addition of high-modulus inclusions of carbon nanotubes are studied. The composite materials are produced by spark plasma sintering. An introduction of carbon nanotubes gives rise to an insignificant decrease in the density and grain size of the ceramics. A larger volume fraction of nanotubes results in an improvement of mechanical properties of the ceramic composites. The highest values of mechanical properties are demonstrated after adding 5 vol.% of carbon nanotubes and are found to be as follows: E = (246 ± 8) GPa, H = (12.7 ± 0.21) GPa, KICI = (12.1 ± 0.35) MPa·m1/2, KICN = (7.8 ± 0.29) MPa·m1/2. Two dissipative mechanisms contribute to the increase in fracture toughness upon introduction of nanotubes: tetragonal-to-monoclinic phase transformation of ZrO2 and crack bridging by the nanotubes. As the amount of introduced inclusions increases, the contribution of martensitic transformation to fracture toughness decreases, which is due to a decrease in the grain size of the tetragonal zirconia phase and, accordingly, its transition to a stable state.



中文翻译:

碳纳米管对纳米结构氧化物陶瓷显微结构和断裂韧性的影响

研究了添加高模量碳纳米管夹杂物的氧化钇稳定氧化锆陶瓷的结构和性能。复合材料是通过放电等离子烧结生产的。碳纳米管的引入导致陶瓷的密度和晶粒尺寸的微小降低。较大体积分数的纳米管导致陶瓷复合材料机械性能的改善。添加 5 vol.% 的碳纳米管后,机械性能的最高值显示如下:E = (246 ± 8) GPa,H = (12.7 ± 0.21) GPa,K ICI = (12.1 ± 0.35) ) MPa·m 1/2 , K ICN = (7.8 ± 0.29) MPa·m 1/2. 引入纳米管后,两种耗散机制有助于提高断裂韧性:ZrO 2 的四方相到单斜相转变和纳米管的裂纹桥接。随着引入的夹杂物数量的增加,马氏体转变对断裂韧性的贡献降低,这是由于四方氧化锆相的晶粒尺寸减小,因此其转变为稳定状态。

更新日期:2021-07-16
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