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Nanomechanical Testing

ScanningWear

Measuring wear resistance at the nanoscale

Overview

ScanningWear testing is a feature enabling research into wear resistance of coatings and films at the nanoscale. The capability is standard on all Hysitron TS Series and TI Series instruments, providing a complementary technique to nanoindentation and scratch.

ScanningWear test on diamond-like carbon (DLC) coating on a computer hard disk drive with 15 μN, 30 μN, and 45 μN loads and 1, 5, and 10 passes, respectively.

How ScanningWear Works

The wear patterns are created by raster scanning the sample with a given force, predefined by the user. A scan can consist of a single pass or multiple passes over the same area within one test.

By applying a known force and selecting the number of passes over which this force is applied, the amount of material that is removed during the wear scan can be measured post-test using the in-situ imaging technique.

ScanningWear enables the ability to wear at different loads and carry out several wear experiments on one sample as show in Figure 1. This experiment involved several individual wear tests carried out at increasing loads and number of passes on a hard drive's DLC film coating. The amount of material removed in each wear test was measured using in-situ imaging (see Figure 2).

The precise positioning that in-situ SPM imaging provides also enables nanomachining and nanopatterning on surfaces, as shown in Figure 3. In this study, two wear patterns were nanomachined in lanthanum oxide. One pattern consisted of a 5 μm x 5 μm square, the other a 1.25 μm x 5 μm rectangle. The patterns were placed less than 1 μm apart, the oxide layer was removed to selectively reveal the substrate.

Wear volumes measured as a function of wear force and number of passes on DLC coating