Cygan Tomasz, Wozniak Jaroslaw, Petrus Mateusz, Lachowski Artur, Pawlak Wojciech, Adamczyk-Cieślak Bogusława, Jastrzębska Agnieszka, Rozmysłowska-Wojciechowska Anita, Wojciechowski Tomasz, Ziemkowska Wanda, 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 Feb 10;14(4):829. doi: 10.3390/ma14040829.
This study presents new findings related to the incorporation of MXene phases into ceramic. Aluminium oxide and synthesised TiC were utilised as starting materials. Knowing the tendency of MXenes to oxidation and degradation, particularly at higher temperatures, structural modifications were proposed. They consisted of creating the metallic layer on the TiC, by sputtering the titanium or molybdenum. To prepare the composites, powder metallurgy and spark plasma sintering (SPS) techniques were adopted. In order to evaluate the effectiveness of the applied modifications, the emphasis of the research was placed on microstructural analysis. In addition, the mechanical properties of the obtained sinters were examined. Observations revealed significant changes in the MXenes degradation process, from porous areas with TiC particles (for unmodified TiC), to in situ creation of graphitic carbon (in the case of TiC-Ti/Mo). Moreover, the fracture changed from purely intergranular to cracking with high participation of transgranular mode, analogously. In addition, the results obtained showed an improvement in the mechanical properties for composites with Ti/Mo modifications (an increase of 10% and 15% in hardness and fracture toughness respectively, for specimens with 0.5 wt.% TiC-Mo). For unmodified TiC, enormously cracked areas with spatters emerged during tests, making the measurements impossible to perform.
本研究展示了与将MXene相融入陶瓷相关的新发现。氧化铝和合成的TiC被用作起始材料。鉴于MXenes有氧化和降解的倾向，尤其是在较高温度下，因此提出了结构改性方法。这些方法包括通过溅射钛或钼在TiC上形成金属层。为了制备复合材料，采用了粉末冶金和放电等离子烧结（SPS）技术。为了评估所应用改性的有效性，研究重点放在微观结构分析上。此外，还对所得烧结体的力学性能进行了检测。观察结果显示，MXenes的降解过程发生了显著变化，从不带TiC颗粒的多孔区域（对于未改性的TiC），转变为原位生成石墨碳（在TiC-Ti/Mo的情况下）。同样，断裂方式也从纯粹的沿晶断裂转变为穿晶模式占比很高的开裂。此外，所得结果表明，经过Ti/Mo改性的复合材料的力学性能有所改善（对于含有0.5 wt.% TiC-Mo的试样，硬度和断裂韧性分别提高了10%和15%）。对于未改性的TiC，测试过程中出现了带有飞溅物的大量裂纹区域, 导致无法进行测量。
