By Herbert Insley
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Extra resources for Microscopy of Ceramics and Cements. Including Glasses, Slags, and Foundry Sands
These papers retain the diamond particles and have adequate strength. Detailed directions for the preparation of polished sections of ceramic materials are given by Snow (6). After the specimen is ground flat with loose silicon carbide on a cast iron lap, it is smoothed on wetted waterrepellent silicon carbide abrasive papers finishing with 600-grit size. Final polish is with metallographic alpha-alumina on a heavy napped wool cloth using water or alcohol for 3^-2 minutes. Specific directions are not possible for preparation of the wide variety of cements and ceramics encountered, and extensive trials are almost always necessary.
The method 1 Instead of using lycopodium powder as an internal standard, a micrometer-driven stage, either mechanical stage or Wentworth stage, m a y be used. T h e t o t a l length of traverse with each objective is recorded, and t h e d a t a are reduced to t h e same basis by dividing the counts by the length of the traverse and b y the width of the counting lane. 50 5 . SPECIAL TECHNIQUES does not give particle size distribution data nor can it deal with more than one mineral if the densities are much different.
Of resin. The dye is stirred first with a few grams of the resin to form a thick paste which is easily blended with the remainder of the resin. Preparations made with methyl methacrylate resins appear to show less strain birefringence than those made with phenol formaldehyde. They are, however, somewhat more difficult to saw and prepare because of flowage of plastic when warm. For specimens containing only coarse pores satisfactory impregnations can be made with the lower melting thermoplastics that are often used for cementing sections to object slides, as for instance, hardened Canada balsam, glycol phthalate, and Lakeside Cement No.
Microscopy of Ceramics and Cements. Including Glasses, Slags, and Foundry Sands by Herbert Insley