Petrus Mateusz, Woźniak Jarosław, Cygan Tomasz, Lachowski Artur, Moszczyńska Dorota, Adamczyk-Cieślak Bogusława, Rozmysłowska-Wojciechowska Anita, Wojciechowski Tomasz, Ziemkowska Wanda, Jastrzębska Agnieszka, Olszyna Andrzej
Faculty of Material Science and Engineering, Warsaw University of Technology, Woloska 141 St., 02-507 Warsaw, Poland.
Institute of High Pressure Physics, Polish Academy of Sciences, Sokolowska 29/37 St., 01-142 Warsaw, Poland.
Materials (Basel). 2021 Jun 25;14(13):3558. doi: 10.3390/ma14133558.
This article presents new findings related to the problem of the introduction of MXene phases into the silicon carbide matrix. The addition of MXene phases, as shown by the latest research, can significantly improve the mechanical properties of silicon carbide, including fracture toughness. Low fracture toughness is one of the main disadvantages that significantly limit its use. As a part of the experiment, two series of composites were produced with the addition of 2D-TiCT MXene and 2D-TiCT surface-modified MXene with the use of the sol-gel method with a mixture of YO/AlO oxides. The composites were obtained with the powder metallurgy technique and sintered with the Spark Plasma Sintering method at 1900 °C. The effect adding MXene phases had on the mechanical properties and microstructure of the produced sinters was investigated. Moreover, the influence of the performed surface modification on changes in the properties of the produced composites was determined. The analysis of the obtained results showed that during sintering, the MXene phases oxidize with the formation of carbon flakes playing the role of reinforcement. The influence of the YO/AlO layer on the structure of carbon flakes and the higher quality of the interface was also demonstrated. This was reflected in the higher mechanical properties of composites with the addition of modified TiCT. Composites with 1 wt.% addition of TiCT M are characterized with a fracture toughness of 5 MPa × m, which is over 50% higher than in the case of the reference sample and over 15% higher than for the composite with 2.5 wt.% addition of TiCT, which showed the highest fracture toughness in this series.
本文介绍了与将MXene相引入碳化硅基体这一问题相关的新发现。最新研究表明，添加MXene相可显著改善碳化硅的机械性能，包括断裂韧性。低断裂韧性是严重限制其应用的主要缺点之一。作为实验的一部分，使用YO/AlO氧化物混合物通过溶胶 - 凝胶法制备了添加二维TiCT MXene和二维表面改性TiCT MXene的两个系列的复合材料。这些复合材料采用粉末冶金技术获得，并在1900℃下通过放电等离子烧结法进行烧结。研究了添加MXene相对所制备烧结体的机械性能和微观结构的影响。此外，还确定了所进行的表面改性对所制备复合材料性能变化的影响。对所得结果的分析表明，在烧结过程中，MXene相发生氧化，形成起增强作用的碳薄片。还证明了YO/AlO层对碳薄片结构和更高质量界面的影响。这体现在添加改性TiCT的复合材料具有更高的机械性能上。添加1 wt.% TiCT M的复合材料的断裂韧性为5 MPa×m，比参考样品高出50%以上，比添加2.5 wt.% TiCT的复合材料高出15%以上，后者在该系列中显示出最高的断裂韧性。
