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KMID : 0381919990290010067
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Korean Journal of Microscopy
1999 Volume.29 No. 1 p.67 ~ p.73
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An Investigation of TEM Specimen Preparation Methods from Powders Using a Centrifuge
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Jeung Jong-Man
Lee Young-Bu
Kim Youn-Joong
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Abstract
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It is practically hard to prepare good TEM specimens from powders which are embedded in epoxy materials for ion milling, because the milling rate difference between powders and epoxy is quite large. In order to overcome this problem, we tried to find methods to increase the density of powders in the embedding epoxy without loosing the adhesive strength between them. Powder density was considerably increased by employing a centrifuge for embedding, compared to the result by a conventional vacuum embedding. In addition, mixing powders of different sizes after sieving also enhanced the final density by allowing smaller particles filling in the gaps of larger particles. Ion milling of powders embedded by these methods resulted in thin specimens good enough for normal TEM works. TEM specimens from spherical, platy and fibrous powders of submicron size were successfully prepared by this centrifuging method.
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KEYWORD
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Powder, Embedding, Centrifuging, Size, Ion milling
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