Towards Quantitative Characterisation of the Small Force Transducer Used in Nanoindentation Instruments

• 作者: Uwe Brand Zhi Li
• 来源期刊: 现代仪器(英文)
• 学科: 医学
• 关键词: NANOMETROLOGY NANOINDENTATION Instrument Nano-Force TRANSDUCER Microelectromechanical Systems Nano-Force Calibration
• 年，卷（期）: 2013,（4）
• 页码范围: 61-67
• 页数: 7页
• 分类号: R73

摘要

Quantitative characterization of the mechanical properties of materials in micro-/nano-scale using depth-sensing indentation technique demands high performance of nanoindentation instruments in use. In this paper, the efforts to calibrate the capacitive force transducer of a commercial nanoindentation instrument are presented, where the quasi-static characteristic of the force transducer has been calibrated by a precise compensation balance with a resolution of ~1 nN. To investigate the dynamic response of the transducer, an electrostatic MEMS (Micro-Electro-Mechanical System) based on nano-force transfer standard with nano-Newton (10-9 Newton) resolution and a bandwidth up to 6 kHz have been employed. Preliminary experimental results indicate that 1) the force transducer under calibration has a probing force uncertainty less than 300 nN (1σ) in the calibration range of 1 mN;2) the transient duration at contact points amounts to 10 seconds;3) the overshoot of engagement is pre-load dependent.