Method for preparation
The dimple grinder is used in the mechanical thinning of TEM-samples. This method reduces the needed time of following preparation methods greatly.
The dimpler creates a grinding recess in the central part of the sample, which has a remaining adjustable thickness of up to a few µm. The dimple wheels are made of copper, bronze or stainless stell and they are used with a diamond or boron nitride paste.
A polishing step afterwards yields an extremely smooth and specular surfaces.
The accuracy of the recess is about 1-2µm. A stereomicroscope allows for accurate alignment of the sample in the grinder.
|Grinding wheels:||ø 15mm made of Cu-bronze und stainless steel|
|Sample holder:||ø 9mm made of stainless steel|
Rotationspeed stepless adjustable