Useful and Maintenance Tips for Metallographic Microscopes Worth Seeing
The common types of metallographic microscopes are upright metallographic microscope and inverted metallographic microscope. What is the difference between the two? What are the maintenance skills of metallographic microscope products? The following content is worth reading.
The difference between an upright metallographic microscope and an inverted metallographic microscope is simply that the upright sample is placed on the bottom, and the inverted sample is placed on the top. Upright objectives point downwards, inverted objectives point upwards. The upright metallographic microscope has the same basic functions as the inverted metallographic microscope, except for the analysis and identification of metal samples with a height of 20-30mm, because it conforms to people's daily habits, it is more widely used in transparent, translucent or opaque substance. The upright metallurgical microscope forms a positive image during observation, which brings great convenience to the user's observation and identification. In addition to the analysis and identification of metal samples with a height of 20-30mm, the objects larger than 3 microns and less than 20 microns are observed, such as the structure and traces on the surface of materials such as cermets, electronic chips, printed circuits, films, fibers, granular objects, coatings, etc. , can have a good imaging effect.
Inverted metallurgical microscope, since the observation surface of the sample coincides with the surface of the workbench downwards, the observation objective lens is located under the workbench and observed upwards, this observation form is not limited by the height of the sample, as long as one observation surface is flat when preparing the sample Therefore, it is widely used in factory laboratories, scientific research institutions and colleges. The base of the inverted metallographic microscope has a large supporting area and a low center of gravity, which is safe, stable and reliable. The eyepiece and the supporting surface are inclined at 45°C, making observation comfortable.
The use and maintenance skills of metallographic microscope are as follows:
1. The operator's hands must be washed and dried, and the environment should be kept clean, and the environment should be kept clean and dry;
2. When the metallographic microscope uses a low-voltage tungsten filament bulb as a light source, the power must be connected through a transformer, and it must not be connected to the 220V power supply by mistake;
3. Be extra careful when replacing the objective lens and eyepiece, and be careful not to drop it by mistake. When using an oil-based objective lens, the amount of oil dripping should not be too much, and it must be washed and dried with xylene immediately after use;
4. When adjusting the axial distance between the object and the front lens of the objective lens (hereinafter referred to as focusing), the relationship between the direction of the coarse adjustment knob and the lifting direction of the stage must first be clarified. The objective lens should be adjusted as close as possible to the object with the coarse adjustment knob first, but must not touch it. Then carefully observe the brightness in the field of view and at the same time use the coarse adjustment knob to slowly adjust the objective lens away from the object. When the field of view suddenly becomes brighter or even has an image, use the fine-tuning knob to adjust until the image is clearest.
5. When maintaining the lens of the metallographic microscope, it is best to use a blower or soft medical gauze to clean the dust. If there are more stubborn stains on the lens of the metallographic microscope, such as fingerprints, grease, etc., you can use a clean soft cloth to clean the dust. Wipe off cotton cloth, lens paper or medical gauze with pure alcohol.
6. For the metallographic microscope, when not in use, please cover it with a plastic cover and put it in a dry place to avoid mold. For metallurgical microscopes, we especially recommend storing objective lenses and eyepieces in a container such as a desiccator with desiccant.
7. The sample to be observed must be completely dried, and the sample etched with hydrofluoric acid takes longer to dry, because hydrofluoric acid has a serious corrosion effect on the lens.
8. When we use a metallographic microscope, do not place the microscope in a humid place. If water falls on the microscope, turn off the power switch immediately, and use it after processing and confirming that it is dry.
9. When we use a metallographic microscope, in order to maintain the performance of the microscope, we generally need to conduct regular inspections. Check whether the optical path, lens, electrical and other aspects are working normally, find out in time, and deal with it in time.
10. Centering of metallographic microscope light bulbs: Place any sample on the stage; turn the condenser knob on the mirror arm to move the condenser out of the light path, turn the color filter group switching handwheel, and turn the purple light (V) or blue light ( B) or green light (G) excites the filter group into the light path, and turns the 10X fluorescent objective lens into the light path; adjust the coarse and fine adjustment handwheels to focus the specimen image clearly; push the focus adjustment pusher on the right side of the vertical illuminator back and forth To make the image of the field of view diaphragm clear, turn the field of view diaphragm lever to shrink the field of view diaphragm, adjust the centering screw of the field of view diaphragm to center the field of view diaphragm, and then open the field of view diaphragm to the maximum ;
