| Autor: |
Zhou, Xin, Jiang, Longtao, Lei, Shengbin, Tian, Wei Quan, Wu, Gaohui |
| Zdroj: |
ACS Applied Materials & Interfaces; June 2015, Vol. 7 Issue: 23 p12688-12694, 7p |
| Abstrakt: |
The authors discovered the self-lubrication behavior of TiB2/Al composite and pointed out that the materials responsible for the self-lubrication behavior comes from the oxidation of TiB2. Atomic/friction force microscopy and first-principles calculations have been employed to study the self-lubrication microscopic mechanism of TiB2/Al composite. Atomic force microscopy confirms the existence of a soft film with nanometer thickness on the TiB2surface, which was attributed to H3BO3film. Friction measurements revealed much smaller friction force on this H3BO3nanofilm than that on Al matrix. The detailed structure and interactions among H3BO3molecules and between the H3BO3sheet and substrate were explored by density functional theory based calculations. The details of adsorption of H3BO3sheet on TiB2and TiO2surface were scrutinized and the potential of the relative movement between H3BO3sheets were scanned and compared with that of graphite. The generation of H3BO3film, the strong chemical adsorption of H3BO3film on the surface of the composite, the strong hydrogen bonding in H3BO3film, and small potential in the relative slide between H3BO3sheets warrant the good self-lubricant properties of TiB2/Al metal matrix composites. |
| Databáze: |
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