Analysis method for internal holes of powder particles

Abstract

The invention discloses a method for analyzing internal holes of powder particles, and belongs to the technical field of analysis. The analysis method comprises the following steps: mixing to-be-detected powder and an embedding medium, and preparing to obtain a cured sample; determining an observation surface of the cured sample, and carrying out argon ion polishing treatment on the observation surface; observing the observation surface subjected to argon ion polishing by using a scanning electron microscope, and randomly shooting the observation surface in a set view field to obtain a plurality of scanning electron microscope images; analyzing the plurality of scanning electron micrographs to obtain parameters related to the properties of the holes so as to analyze the internal holes of the powder particles; the parameters comprise the total number of powder particles in a plurality of scanning electron micrographs, the total number of holes in the plurality of scanning electron micrographs, the sum of the diameters of all the holes, the average diameter of the holes, the total number of the particles with the holes in the plurality of scanning electron micrographs, the sum of the diameters of all the particles with the holes and the average diameter of the particles with the holes. The method is suitable for quantitative and qualitative analysis of internal holes of powder particles with the particle size of 2-10 [mu] m.

Description

technical field [0001] The invention relates to the technical field of analysis, in particular to an analysis method for the internal pores of powder particles. Background technique [0002] Metal powder is usually prepared by atomization method, also known as spray method. During the preparation process, when the atomizing gas enters the droplets, due to the fast solidification speed, the atomizing gas has no time to discharge the inside of the metal powder particles, so that the metal powder particles are In the case of internal defects such as voids, after these defective metal powder particles are made into products by powder metallurgy process, pores will be generated inside the product, forming a source of fracture. It can be seen that there are holes in the metal powder, which will cause the existence of holes in the metal dense material prepared from the metal powder, and the existence of a large number of holes in the metal powder, which will lead to the decrease of...

AI Technical Summary

Problems solved by technology

[0005] When using an optical microscope to observe powder particles with a particle size of 2 μm-10 μm, the magnification of the field of view is limited, and statistics are difficult

When observing with a scanning electron microscope, the requirements for the preparation of the sample are very high. After the sample is polished and polished, the oxidized damage layer is easy to appear, and the real internal structure of the powder particle cannot be restored, so that the internal porosity of the particle cannot be accurately evaluated.

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