Abstract
Indentation has become a useful technique for measuring the physical properties of nanomaterials, mechanical stability of beam structures and diaphragms, with the advancement of nanotechnology and MEMS based devices. When combined with electrical contact resistance measuring attachment, indentation tool can provide valuable new insights into contact resistance evolution and material deformation behavior at the nanoscale and obtain other physical properties of the materials. In this work, the design and development of a low-cost tabletop indenter setup with in-situ electrical contact resistance (ECR) measurement attachment is reported. The indenter consists of a piezo electric based positioner and a displacement sensor. A conductive diamond probe attached to the positioner monitors electrical resistance simultaneously. The functionality of the indenter is verified by indenting a porous-alumina-Ni nanocomposite material. It is found that resistance drops with increasing load as area of contact increases. Also, hardness of the composite is calculated from the indentation impression.
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