Sample preparation method for inorganic nonmetal powder material for backscattered electron image and energy spectrum study

Abstract

The invention relates to a sample preparation method for inorganic nonmetal powder material for the backscattered electron image and energy spectrum study. The sample preparation method comprises the steps as follows: 1, blending and uniformly mixing a powder sample with epoxy resin, 2, inlaying a sample by adopting a vacuum inlay instrument, 3, curing for 24 h at room temperature, 4, grinding and polishing, 5, performing ultrasonic cleaning, and 6, performing film coating. When the sample number is smaller or a plurality of samples are required to be observed at the same time, a secondary inlaying technology is adopted and comprises the steps as follows: firstly, a smaller die is adopted, and one or more small samples are prepared via the steps 1-3, then, the cured samples are placed into a bigger die, epoxy resin is poured into the vacuum inlay instrument, and the samples are cured at room temperature, and subsequent treatment is performed on the samples according to the steps 4-6. The sample preparation method provided by the invention can improve the sample quality, simplify the operating process and reduce the sample preparation difficulty.

Description

technical field [0001] The invention relates to the field of material analysis, in particular to a method for preparing samples of inorganic non-metallic powder materials for backscattered electron image and energy spectrum research. Background technique [0002] In the field of inorganic non-metallic materials, using backscattered electron images and energy spectroscopy to study the microstructure, chemical composition and phase composition of materials is a very effective microscopic testing method. This method takes the sample section as the observation object, therefore, the display opportunities of various microstructural features, chemical elements and phase information inside the sample are equal. Furthermore, the method is equally sensitive to the composition and distribution of low-content phases, amorphous phases, and trace elements. When using it to analyze cement, fly ash, slag and other inorganic non-metallic materials with complex phase composition and coexist...

AI Technical Summary

Problems solved by technology

On the other hand, in order to include a sufficient number of particles in the electron microscope image, the traditional method should try to increase the ratio of powder sample to epoxy resin (usually above 2:1) during sample preparation, and the resulting mixture is viscous and poor liquidity

This will not only prevent some powder particles from being fully covered by epoxy resin, resulting in particle shedding during the grinding and polishing process, but also, because the particle distance is too small, it is easy to generate sample discharge and energy spectrum scanning when taking electron microscope images. The boundary of some small particles in the image is difficult to distinguish, etc.

In addition, the sample cutting process of the traditional sample preparation method is prone to problems such as epoxy resin sticking to the knife, and the two cutting planes are not easy to keep parallel.

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