Recommendations in preparing ceramics for nanoindentation and in the process minimize introducing stresses from sample preparation i.e. polishing stage.
hey martin,
for sample preparation there are the steps
1. sectioning: selection of right size of sample. for that we generally cut or crush. ceramic samples usually are brittle.. so fast cutting/grinding or crushing may damage your samples. so better to use a slow speed, lubricate cutting equipment.
2. Mounting: it is for ease.it provides convenience in handling and protection to the edges of the specimen being prepared during polishing operations. we generally use epoxy based resins now a days
3. Surface preparation: it involves grinding and polishing. Coarse grinding generates the initial flat surface necessary for the subsequent grinding and polishing steps. Course grinding can be accomplished either wet or dry using 80 to 220 or even higher grits sandpaper/ emery papers on rotating disks/ or just hand. Care must be taken to avoid significant heating of the sample. if metals are involved in sample like in iron oxides (total Fe > 40 % by mass)... cloth polish with diamond spray can even tried. just get a mirror surface.. that it.
4. Etching: folllowing initial inspection in the unetched state, etching is often employed to highlight microstructural features or phases present in the material. Etching occurs when the acid or base placed on the specimen preferentially attacks specific phases present.
After the microstructure is exposed under magnification,.... u can perform your nanoindentation test with ease.
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Himansu Shekhar Mahapatra
Any recommendations in preparing ceramics for nanoindentation and in the process minimize introducing stresses from sample preparation i.e. polishing stage.
use Universal tooling grinder plus polishing method for least residual stress and more bending strength'
Universal Tooling grinder wheel (resin Bonded diamond, 100 grain size) ;
heel diameter 250 mm
wheel speed 30m/s
table speed 10mm/s
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