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This stage should have a maximum rate of polishing the rough polishing, the formation of deformation layer is a secondary consideration, but should also be as small as possible. Followed by fine polishing (also known as the final cast), and its purpose is to remove the rough polishing deformation layer, so that the polishing damage minimize. In the past, rough polishing, commonly used abrasive particle size of 10 ~~ 20? M of α-Al2O3, Cr2O3, Fe2O3, add water, dubbed the suspension. At present, the synthetic diamond abrasives has been gradually replaced by aluminum and other abrasive because it has the following advantages: 1) alumina compared to the much smaller particle size diamond abrasive, the polishing rate is much greater.  green laser pointer  has more than three functions.
For example, 4 ~ 8? M diamond grit polishing rate of 10 ~ 20? M alumina or silicon carbide polishing rate is similar; 2) the surface deformation layer shallow; 3) polishing the best quality. Typically, using a diamond paste abrasive polishing rate than suspension. When the price of the diamond abrasive polishing rate, cutting the ability to maintain long time, so its consumption, as long as the economy and reasonable to select the speed of the polishing machine (mechanical polishing for 250 ~ 300r / min, automatic polishing should be as 150r/min), can give full play to its advantages. Rough polishing using diamond paste, generally use the particle size of 3.5? M abrasive. Battery model of this kind of    green laser pointer      is CR123A.
Then use the particle size of 1? M abrasive, softer material to use granularity to 0.5? M abrasive in order to obtain the best results. Although the principle has been more mature for polished and rough polishing, but for fine polishing, but also requires the operator to have a higher skills. Common fine polishing abrasive for MgO and γ-Al2O3, which MgO polished best, but the polishing efficiency is low, and difficult to grasp; γ-Al2O3 polishing rate, and easy to learn. Microcomputers in recent years on the polishing machine configuration, so that the automation of the polishing process, polishing machine can work in accordance with the provisions of the parameters (such as speed, pressure, the choice of lubricant, abrasive spray frequency, etc.), these parameters can also be with The time change. For some metallographic specimens. The appearance color of   usa green laser pointer      can be customized as red.
As long as the optimal sample parameters are established, the importance of sample preparation efficiency of 15 fruit well, efficiency is greatly improved. However, this sample preparation equipment and can not completely replace the staff of metallographic technique, it can only work in accordance with the procedures of pre-formulated. 5) erosion of the specimen mechanical polishing, under the microscope, only to see the light grinding and inclusion. Microscopic analysis of the sample organization must also make the specimens after corrosion. Commonly used method of corrosion chemical etching and electrolytic etching method (observation of the metallographic sample of non-metallic inclusions, the direct optical method does not require any corrosion). Figure 5 when the sample etched in pure metal crystallization to each of the various grain is not the same chemical properties anisotropy. The body of this kind of    green laser pointer      is firm enough.
Some grain corroded faster erosion on the deep; some grain subject to eclipse the slow erosion of shallow. The light from the grain reflected the same results under a microscope, the degree of lightness or darkness of each grain will not. Alloy that often exist in the composition of two or more objects. Due to their different physical and chemical properties, and some erosion easy, some difficult to dip the light reflection of Figure 5 grain and grain boundary corrosion; and their electrochemical potential to form a micro-battery, the anode composition was dissolved cathode composition is protected. Irregular arrangement of atoms on the grain boundaries, internal energy larger, there are some mixed susceptible to erosion than inside the grains. The size of    green laser pointer      can be customized.