Yang C W, Williams D B, Goldstein J I
Department of Materials Science and Engineering, Whitaker Lab., Lehigh University, Bethlehem, Pennsylvania 18015, USA.
Microsc Res Tech. 1996 Nov 1;35(4):334-9. doi: 10.1002/(SICI)1097-0029(19961101)35:4<334::AID-JEMT4>3.0.CO;2-M.
Thin foil preparation for metal particles in brittle ceramic matrices is particularly difficult, due to differential thinning of the component materials. This paper considers the preparation of thin foils of stony meteorites. Stony meteorites have a composite nature consisting of small metal particles (< 200 microns) embedded in an inherently brittle silicate matrix. Specimens of this type are difficult to prepare as thin foils because the area of interest is limited to specific regions within the metal particles. The problems of thin foil preparation of metal particles in the stony meteorites were overcome by developing a technique involving electrochemical polishing prior to ion beam thinning. The metal particles were first separated from the silicate matrix and then embedded in Epo-Tek H20E silver epoxy. This specific epoxy was selected for its good electron conductivity which allowed the specimen to be thinned by the electrochemical polishing technique. Specimens prepared by this technique have permitted the direct observation and characterization of the metallic phases in stony meteorites.
由于组成材料的差异化减薄，制备脆性陶瓷基体中金属颗粒的薄箔特别困难。本文考虑石质陨石薄箔的制备。石质陨石具有复合性质，由嵌入固有脆性硅酸盐基体中的小金属颗粒（<200微米）组成。这类样品难以制备成薄箔，因为感兴趣的区域仅限于金属颗粒内的特定区域。通过开发一种在离子束减薄之前进行电化学抛光的技术，克服了石质陨石中金属颗粒薄箔制备的问题。首先将金属颗粒从硅酸盐基体中分离出来，然后嵌入Epo-Tek H20E银环氧树脂中。选择这种特定的环氧树脂是因为其良好的电子导电性，这使得样品能够通过电化学抛光技术减薄。通过该技术制备的样品使得能够直接观察和表征石质陨石中的金属相。
