A non-ferrous alloy composed of tin-based and other alloying elements. The main alloying elements are lead, antimony, copper and so on. Tin alloy has low melting point, low strength and hardness, high thermal conductivity and low thermal expansion coefficient, atmospheric corrosion resistance, excellent friction reduction performance, easy to weld with steel, copper, aluminum, their alloys and other materials combine. It is a good solder and also a good bearing material.
01 Grinding
Grind the specimen with Alpha -600 automatic grinder&polisher,abrasive paper P800→P2500;
Alpha-600 automatic grinder&polisher
Abrasive paper
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Equipment |
Alpha-600 automatic grinder&polisher |
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Consumables |
Abrasive paper:P800;P1200;P2000;P2500 |
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Parameter |
Pressure:15N,Speed:130rpm,Time:2Min |
02 Plane grinding
Polish the specimen with Alpha-600 automatic grinder&polisher,use SC polishing cloth first, then use 3μm polycrystalline diamond suspension with polishing lubricant for plane grinding;
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SC-JP white natural silk polishing cloth
PD-W polycrystalline diamond suspension
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Equipment |
Alpha-600 automatic grinder&polisher |
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Consumables |
SC polishing cloth,3μm polycrystalline diamond suspension,polishing lubricant |
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Parameter |
Same direction:150rpm,Pressure:20N,Time: 300s |
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03 Medium polishing
Polish the specimen with Alpha-600 automatic grinder&polisher,use ET polishing cloth with 0.05μm alumina suspension for medium polishing;
ET-JP white synthetic velvet polishing cloth
AO-P Alumina suspension
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Equipment |
Alpha-600 automatic grinder&polisher |
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Consumables |
ET polishing cloth,0.05μm Alumina suspension |
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Parameter |
Same direction:120rpm,pressure:18N,time:120s |
04 Fine polishing
Polish the specimen with Alpha-600 automatic grinder&polisher,use ET polishing cloth with 50nm non-Crystallizing Silica;
SO A439 non-crystalizing Silica
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Equipment |
Alpha-600 automatic grinder&polisher |
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Consumables |
ET polishing cloth,50nmnon-crystallizing silica |
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Parameter |
Same direction:120rpm,pressure:10N,time:60s |
05 Vibration polishing
Polish the specimen with VP-430 vibration polishing machine, use ET polishing cloth with 50 nm non-crystallizing silica ;
VP-430 vibration polishing machine
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Equipment |
VP-430 vibration polishing machine |
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Consumables |
ET polishing cloth,50nm non-crystallizing silica |
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Parameter |
Frequency:133,speed:139,time:1h |
06 Observation
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Equipment |
MN 60 series microscope |
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Parameter |
50×→500× |
07 Analysis
SAB
Mechanical polishing 100X
Vibration polishing 100X
Pure tin
Mechanical
polishing 100X
Vibration
polishing 100X
Vibration polishing polarized light 100X
Tin and its alloys are relatively soft and can be easily scratched on the surface.
General mechanical polishing is difficult to remove tiny scratches on the surface of the sample, so it is better to perform vibration polishing on it. This would give us a surface without scratches and stress layers that allows not only optical metallographic analysis but also EBSD analysis.
It can be seen from the above pictures that there are no scratches on the surface of the sample after vibration polishing, and the outlines of each phase are clear and distinct.