Indentation and scratch testing of DLC-Zr coatings on ultrafine-grained titanium processed by high-pressure torsion
Indentation and scratch testing of DLC-Zr coatings on ultrafine-grained titanium processed by high-pressure torsion
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DOI：
10.1016/j.wear.2012.12.033
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发表时间：
2013-08
期刊：
影响因子：
5
通讯作者：
Chuan Ting Wang;A. Escudeiro;T. Polcar;A. Cavaleiro;R. Wood;N. Gao;T. Langdon
中科院分区：
文献类型：
--
作者：
Chuan Ting Wang;A. Escudeiro;T. Polcar;A. Cavaleiro;R. Wood;N. Gao;T. Langdon
在3.0 GPa的室温压力下，采用高压扭转法细化了2级Ti的微观组织。2级Ti的显微硬度从粗晶状态下的1.82 GPa提高到高压扭转处理后的3.05 GPa，与Ti - 6al - 4v合金的硬度非常接近。随后，通过物理气相沉积在接收态Ti、高压扭转处理的Ti和Ti - 6al - 4v样品上沉积了几种厚度为~ 1.4 μm的类金刚石碳（DLC）涂层。压痕和划痕试验结果表明，以高压扭转处理过的Ti为基体的DLC- 7zr、DLC:H-7Zr和DLC- 9zr涂层与以粗晶Ti为基体的DLC- 7zr涂层相比，附着力明显提高。结果表明，经高压扭转处理并涂覆类金刚石碳涂层的商业纯钛为生物植入物应用提供了潜在的候选材料。
High-pressure torsion was employed to refine the microstructure of grade 2 Ti under an imposed pressure of 3.0 GPa at room temperature. The microhardness of grade 2 Ti increased from 1.82 GPa for the coarse grain state to 3.05 GPa after high-pressure torsion processing, where this value is very close to the hardness of the Ti–6Al–4V alloy. Subsequently, several diamond-like carbon (DLC) coatings with thicknesses of ∼1.4 μm were deposited on as-received Ti, high-pressure torsion processed Ti and Ti–6Al–4V samples via physical vapour deposition. Both indentation and scratch tests showed a much improved adhesion of DLC-7Zr, DLC:H-7Zr and DLC-9Zr coatings with high-pressure torsion processed Ti as the substrate by comparison with the same coatings on coarse-grained Ti. The results suggest that commercial pure Ti processed by high-pressure torsion and coated with a diamond-like carbon coating provides a potential candidate material for bio-implant applications.