超硬纳米类金刚石膜的结构特点及其形成机制的探讨

Inquiry of structural characteristics and formation mechanism of super-hard nano-carbon film

研究了超硬碳膜的力学性质、波谱性质及结构性质 ,指出有一种无氢类金刚石膜是由石墨碎片、布基葱和金刚石晶粒以新型的共价键组成的网架结构 ,具有良好的力学性能 .由于石墨碎片中的π键变形 ,石墨碎片和布基葱边缘的不饱和悬键与金刚石晶粒周围的悬键结合成新型的共价键 .金刚石晶粒只能由激发态碳原子在非平衡重组过程中产生 ,而石墨碎片既可以在碳原子重组过程中产生 ,也可以在蒸发石墨过程中产生 .

The mechanical, structural, and spectral properties of super hard diamond like nano carbon film are studied. It is proposed that there is a kind of amorphous carbon film composed of graphite fragment, bucky onions and crystalline diamond grains that has good mechanical properties. Owing to the π bond deformation of graphite fragment, a new kind of valence bond is formed by the unsaturated dangling bonds around the graphite fragment, bucky onions and crystalline diamond grains. The graphite fragment can be formed not only in non equilibrium process but also in the graphite evaporation process, but the crystalline diamond grains can be formed only by the carbon atom in an excitation state during non equilibrium process.