Mechanical polishing of ultrahard nanotwinned diamond via transition into hard sp2-sp3 amorphous carbon

作者：Jin, Tianye; Ma, Mengdong; Li, Baozhong; Gao, Yufei; Zhao, Qingliang^*; Zhao, Zhisheng; Chen, Junyun^*; Tian, Yongjun

来源：Carbon, 2020, 161: 1-6.

DOI：10.1016/j.carbon.2020.01.041

• Nanotwinned diamond
• Mechanical polishing
• Amorphous carbon

Ultrahard nanotwinned diamond (nt-D) is an ideal material for next-generation high-precision, high-efficiency cutting tools, due to its high hardness, enhanced fracture toughness, and increased oxidation resistance temperature, when compared with natural diamond. However, a critical problem that limits the application of such material is the grinding and polishing of nt-D material into suitable shapes. In this study, we confirmed the feasibility of classical mechanical polishing for nt-D through amorphization transition. The effect of mechanical loading and the catalysis of Fe nano-particles work together, promoting the transformation of nt-D into a hard sp(2)-sp(3) amorphous carbon. The surface of the amorphous carbon layer and the interface between amorphous carbon and nt-D were both smooth after polishing. The results are valuable for the mechanical processing and further applications of ultrahard nanotwinned diamond.

• 单位
  燕山大学