SU85111A1 - A method of making preparations for examining the structure of opaque materials, such as metals, in an electron microscope and adapting to an optical microscope to implement this method - Google Patents

Description

The essence of the described method is as follows.

A prepared thin section to be studied in a known manner is examined in a microscopic microscope on which the microhardness measuring device is installed.

The required place on the thin section (structural component, section of the grain boundary, etc.) is brought under the intersection of the cross of filaments in the ocular. Then, by moving the table, the thin section is sequentially moved by 0.15-0.2 mm in each direction along two mutually perpendicular directions (along the cross threads). In these positions, four taps are made with the indenter of the device, picking up the sludge load to obtain a print of the desired (very small) dimensions. Thus, the structural component of interest is located at the intersection of the straight lines connecting the centers of the prints. To make it easier to find the right section of a thin section, it is marked with a small ring with a diamond marker.

There are other ways of marking thin section. For example, it is not necessary to place the prints of abb-b-d along the cross, they can be put along one line (Fig. I) so that the extreme-large-prints can be used as coordinate marks, and the middle-small marks can mark the position of the desired component; in combination with the ringlet, this method of marking is quite reliable.

Lacquered, oxide, or quartz films are obtained from known clips in one way or another. The latter receive a two-stage; process with the preparation of polystyrene imprint and deposition on it of quartz in a vacuum.

No. 85111.- 2 -

In contrast to the standard methods, the oxide and lacquer films, after separation from the surface, are also mounted on a polystyrene plate. For this purpose, thin polystyrene (thickness 0.5-0.6 mm) transparent discs are specially pressed out from which rectangular plates are cut. Oxide and lacquer films are poured onto these plates from the wash bath. Thus, all three types of films are reduced to a universal preparation with a polystyrene backing.

Then, any of the preparations 1 are placed (FIG. 2) on the table 2 of the biological mokroskop 3 with the film downward, placing the plate 4 in the form of a bridge between two glass slides 5 and 6 so that the film does not touch the glass. The film structure is examined through a polystyrene plate with an increase of about 400. Moving the table and focusing on the well-visible ringlet, coordinate the imprints are aligned with the cross of the filaments and thus combine the structure of the studied component with the optical axis of the microscope.

On the body of the lens of the microscope there is a sleeve 7 of Plexiglas with a hole under the front lens of the lens and with a flat torpal surface. The end of the sleeve is smeared with glue, and the microscope tube is gently lowered until it touches the polystyrene plate, which is glued to the sleeve and can be lifted during the reverse movement of the tube.

Then, an object diaphragm 8 with a hole in the form of a regular circle with a diameter of 0.2-0.25 mm is placed on a glass slide (Fig. 3) and the hole is centered along the cross of the filaments, considering the diaphragm through a polystyrene plate. The edges of the diaphragm are also pre-lubricated with glue (for example, dextrin). The tube is lowered again, the plate with the film is pressed against the diaphragm and held for several minutes, after which the tube is lifted (Fig. 4) and the plate with the film glued to the object diaphragm is carefully separated with a pair of tweezers from the end of the sleeve.

This is followed by the dissolution of the polystyrene plate in ethyl bromide (films and glue do not dissolve), washing and mounting of the preparations in the object holder.

After the manipulations, the preparation lies on the diaphragm so that the structural component under investigation is located in the center of the aperture of the diaphragm.

Subject invention

Claims (3)

1. A method of making preparations for examining the structure of opaque Materials, for example metals, in an electron microscope, characterized in that the surface of the schlifa is preliminarily crushed, for example, with a diamond marker or other device so that the area under study (structural component, grain boundary and etc.) was located at the intersection of the marks put on the clip (scratches or straight lines connecting the centers of the marks of the marker), are obtained from the marking section using the known film-casting methods they are polystyrene plates, then using an optical microscope, align the cross section of threads to align the test area with the center of the hole of the standard object-diaphragm of the electron microscope; solvent. 2. A method for carrying out the method according to claim 1, characterized in that the test area selected on a thin section is outlined with a risk, for example, using a diamond marker. 3. A device for an optical microscope for carrying out the method according to claim 1, characterized in that it is made in the form of an organic glass sleeve mounted on the microscope objective body, which is used to glue the polystyrene plate to it after aligning the film with the optical axis of the microscope by lowering it and then raising the microscope tube, and then for gluing the polystyrene plate glued to the sleeve with the object-diaphragm after alignment of the latter by the cross of the filaments carried out similar th movement of the microscope tube. “:. and oo Fig- f 7 8 Figz FIG.