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Natural Science Forum / Earth Science / Mineralogy / September 2004minerals polishing for image analysis
I am investigating the grinding/polishing systems available for a new SEM imaging and image analysis facility. I have noted at a facility I visited the use of the Stuers Tegra system, but this was a high-throughput minerals processing facility which polished grain mounts exclusively. For this Struers system, its sample mover is spec'd at 150rpm ... whereas I note the Struers polishing head for their PdM system specific for minerals polishing is spec'd at 4rpm. How do I comprehend such a huge difference? If I anticipate minerals in general (silicates, oxides, sulfides), am I that much better off with the slow system? (also of note, the Buehler head moves at 60rpm). tia ... michael shaffer :o) www.micro-investigations.com > I am investigating the grinding/polishing systems available for a new SEM > imaging and image analysis facility. I have noted at a facility I visited [quoted text clipped - 10 lines] > tia ... michael shaffer :o) > www.micro-investigations.com Speed depends on the materials being polished. For metals, soft ores, graphite/carbon, etc., low speeds are highly desirable to prevent plucking and edge rounding. For most normal minerals, higher speeds are useful for quicker processing. Exceptions are any mineral/compound with pronounced cleavage. Henry Barwood IMHO, there is NO standard, uniform, universal polishing system for ALL minerals, especially when they are mixed. The Vanderwilt system is an exception and gives excellent results, but you need three huge and heavy polishing machines, a large room for it, a full time technician, and a tightly controled embedding with hot epoxy. J.J. > I am investigating the grinding/polishing systems available for a new SEM > imaging and image analysis facility. I have noted at a facility I visited [quoted text clipped - 10 lines] > tia ... michael shaffer :o) > www.micro-investigations.com |
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