New Generation Nuclear Reactor Fuel Element, Metallography of Nuclear Fuel Ball TRISO Particles. The center is UO2, and the outer coating layers are Buffer, IPyC, SiC, OPyC in sequence, with a thickness of about tens of microns, and the columnar SiC matrix.
Equipment.consumables
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Equipment |
Trojan Alpha-600 automatic grinder&polisher;
Leica DM2700M metallographic microscope;
Hairdryer; |
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Consumables |
Ethyl alcohol;Degreasing cotton; |
Grinding
Polish the specimen with Alpha-600 automatic grinder&polisher. In order to improve the efficiency, you can use a coarse diamond grinding disc to quickly grind the position you want to observe. Then finely grinding the position for a long time to remove chippings and deep cracks from plane grinding.
Alpha-600 automatic grinder&polisher
Diamond grinding disc
P3000 grinding-50×
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Equipment |
Alpha-600 automatic grinder&polisher |
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Consumables |
Diamond grinding disc:P400, P1500,P3000 |
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Parameter |
P400:pressure 24N,same
direction 200rpm,time:Grind
until it is close to the position to be observed |
Polishing-plane polishing
Polish the specimen with Alpha-600 automatic grinder&polisher,use NL polishing cloth with 3μm polycrystalline diamond suspension for plane polishing. At the same time, add non-crystallizing silica suspension for chemical mechanical polishing.
NL-CP white fiber polishing cloth
NL-polishing-50×
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Equipment |
Alpha-600 automatic grinder&polisher |
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Consumables |
NL-CP white fiber polishing cloth,3μm polycrystalline diamond suspension+non-crystallizing silica suspension |
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Parameter |
Pressure:25N,same direction:150rpm,time:600s |
Polishing –medium polishing
Polish the specimen with Alpha-600 automatic grinder&polisher, use CS polishing cloth with 1μm polycrystalline diamond suspension for plane grinding,add non- crystallizing silica suspension for chemical mechanical polishing at the same time.
CS-JP blue synthetic silk polishing cloth
Diamond suspension
CS-polishing-50×
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Equipment |
Alpha-600 automatic grinder&polisher |
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Consumables |
CS-JP blue synthetic silk polishing cloth,1μm polycrystalline diamond suspension+non- crystallizing silica |
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Parameter |
Pressure:20N,same direction:150rpm,time:300s |
Polishing-final polishing
Polish the specimen with Alpha-600 automatic grinder&polisher,
Use ZN polishing cloth with non-crystallizing silica suspension for polishing.
Non-crystallizing silica suspension
ZN-polishing-50×
ZN-polishing-100×
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Equipment |
Alpha-600 automatic grinder&polisher |
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Consumables |
ZN-ZP black polyurethane polishing cloth,1μm polycrystalline diamond suspension+non-crystallizing silica suspension |
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Parameter |
Pressure:15N,reverse direction:120rpm,time:180s |
Observation
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Equipment |
Leica DM2700M metallographic microscope |
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Consumables |
|
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Parameter |
50×→500× |
Analysis
Ceramic ball 50×
Ceramics are hard and difficult to grind with ordinary SiC abrasive paper, so resin-based diamond grinding discs can be used for grinding. However, coarse grinding discs tend to chip and crack the ceramic, so it takes a longer time to remove the larger pits and cracks on the ceramic surface during fine grinding.
Polishing requires the use of mechanochemical polishing to prepare a good surface. If the sample is not mounted well enough, not all the pellets can be ground out at the same time. In order to prevent the ceramic balls in the core from falling off, it is necessary to keep the position of the small balls evenly distributed during mounting. When grinding, the balls can be ground uniformly. As long as the grinding does not exceed the radius of the ball, the ball can be prevented from coming out.