1. Requirements for Metallographic Preparation: the selected sample must be representative; Retain all structural features; The surface is free of scratches and deformation; No external impurities are introduced into the sample surface; The sample surface is flat and reflective.


2. Sample preparation steps: cutting; Mosaic; Grinding and polishing


3. Precautions during cutting: avoid sample burning (cut at a slower speed and fully water-cooled); Select the appropriate cutting disc (resin bonded grinding wheel cutting blade); Select the appropriate cutting area; Clean the sample with acetone after cutting.


Improper cutting method due to mechanical deformation will cause thermal damage (as shown in the following figure)

It is recommended to use metlab cut-10 metallographic cutting machine

It is recommended to use qmaxis cre-10-4560 or cre-10-ra grinding wheel to cut the blade


4. Precautions for hot mosaic: select small samples; Avoid embedding samples of different materials together; Oil free samples (must be cleaned before embedding); Choose hot mosaic powder with high hardness

It is recommended to use metlab metpress a automatic metallographic mosaic machine


It is recommended to use qmaxis epowder g or epowder f thermosetting epoxy resin


5. Polishing: suitable sample table; Rough grinding; Fine grinding; Polishing (opening pores); Pay attention to cleaning samples in different polishing steps;


6. Easy mistakes in polishing:


1) Polishing time is too short; Wrong pore structure; High density; Density change; Cracks cannot be seen


2) Polishing time is too long; Wrong pore structure; Large and round pores; Pull out particles

It is recommended to use metlab metpol-a metallographic polishing machine


Qmaxis polishing consumables are recommended.