Łukasiewicz Research Network-Cracow Institute of Technology, Centre of Advance Manufacturing Technology, 73 Zakopianska St., 30-418 Cracow, Poland.
Faculty of Civil Engineering and Architecture, Lublin University of Technology, 38d Nadbystrzycka St., 20-618 Lublin, Poland.
Molecules. 2021 Mar 3;26(5):1344. doi: 10.3390/molecules26051344.
Ti(C,N)-reinforced alumina-zirconia composites with different ratios of C to N in titanium carbonitride solid solutions, such as Ti(C,N) (C:N = 30:70) and Ti(C,N) (C:N = 50:50), were tested to improve their mechanical properties. Spark plasma sintering (SPS) with temperatures ranging from 1600 °C to 1675 °C and pressureless sintering (PS) with a higher temperature of 1720 °C were used to compare results. The following mechanical and physical properties were determined: Vickers hardness, Young's modulus, apparent density, wear resistance, and fracture toughness. A composite with the addition of Ti(C,N)n nanopowder exhibited the highest Vickers hardness of over 19.0 GPa, and its fracture toughness was at 5.0 Mpa·m. A composite with the Ti(C,N) phase was found to have lower values of Vickers hardness (by about 10%), friction coefficient, and specific wear rate of disc (Ws) compared to the composite with the addition of Ti(C,N). The Vickers hardness values slightly decreased (from 5% to 10%) with increasing sintering temperature. The mechanical properties of the samples sintered using PS were lower than those of the samples that were spark plasma sintered. This research on alumina-zirconia composites with different ratios of C to N in titanium carbonitride solid solution Ti(C,N), sintered using an unconventional SPS method, reveals the effect of C/N ratios on improving mechanical properties of tested composites. X-ray analysis of the phase composition and an observation of the microstructure was carried out.
采用不同碳氮比的 Ti(C,N)固溶体（如 Ti(C,N)(C:N=30:70) 和 Ti(C,N)(C:N=50:50）增强氧化铝-氧化锆复合材料，以提高其力学性能。采用温度为 1600°C 至 1675°C 的火花等离子烧结（SPS）和温度较高的无压烧结（PS）（1720°C）进行对比研究。测试了复合材料的力学性能和物理性能，包括维氏硬度、杨氏模量、表观密度、耐磨性和断裂韧性。添加 Ti(C,N)n 纳米粉末的复合材料表现出最高的维氏硬度，超过 19.0 GPa，其断裂韧性为 5.0 Mpa·m。Ti(C,N) 相的复合材料的维氏硬度（约 10%）、摩擦系数和盘的比磨损率（Ws）均低于添加 Ti(C,N)的复合材料。随着烧结温度的升高，维氏硬度值略有降低（5%至 10%）。PS 烧结的样品的力学性能低于 SPS 烧结的样品。这项关于不同碳氮比的 Ti(C,N)固溶体 Ti(C,N)增强氧化铝-氧化锆复合材料的研究，采用非传统的 SPS 方法烧结，揭示了 C/N 比在提高测试复合材料力学性能方面的作用。对相组成进行了 X 射线分析，并观察了微观结构。
