Liu Bing, Zhuge Zewen, Zhao Song, Zou Yitong, Tong Ke, Sun Lei, Wang Xiaoyu, Liang Zitai, Li Baozhong, Jin Tianye, Chen Junyun, Zhao Zhisheng
Center for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.
School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China.
Nanomaterials (Basel). 2022 Oct 24;12(21):3733. doi: 10.3390/nano12213733.
The reinforcements represented by graphene nanoplatelets, graphite, and carbon nanotubes have demonstrated the great potential of carbon materials as reinforcements to enhance the mechanical properties of TiO. However, it is difficult to successfully prepare TiO-diamond composites because diamond is highly susceptible to oxidation or graphitization at relatively high sintering temperatures. In this work, the TiO-diamond composites were successfully prepared using high-pressure sintering. The effect of diamond on the phase composition, microstructure, mechanical properties, and tribological properties was systemically investigated. Diamond can improve fracture toughness by the crack deflection mechanism. Furthermore, the addition of diamond can also significantly reduce the friction coefficient. The composite composed of 10 wt.% diamond exhibits optimum mechanical and tribological properties, with a hardness of 14.5 GPa, bending strength of 205.2 MPa, fracture toughness of 3.5 MPa∙m, and a friction coefficient of 0.3. These results enlarge the family of titania-based composites and provide a feasible approach for the preparation of TiO-diamond composites.
由石墨烯纳米片、石墨和碳纳米管等增强材料所代表的碳材料，已展现出作为增强剂来提高TiO机械性能的巨大潜力。然而，由于金刚石在相对较高的烧结温度下极易发生氧化或石墨化，因此难以成功制备TiO-金刚石复合材料。在这项工作中，采用高压烧结成功制备了TiO-金刚石复合材料。系统研究了金刚石对相组成、微观结构、力学性能和摩擦学性能的影响。金刚石可通过裂纹偏转机制提高断裂韧性。此外，添加金刚石还能显著降低摩擦系数。由10 wt.%金刚石组成的复合材料表现出最佳的力学和摩擦学性能，硬度为14.5 GPa，弯曲强度为205.2 MPa，断裂韧性为3.5 MPa∙m，摩擦系数为0.3。这些结果扩大了二氧化钛基复合材料的种类，并为制备TiO-金刚石复合材料提供了一种可行的方法。
