Preparation method of conductive scanning metallographic sample

Abstract

The invention relates to a preparation method of a scanning metallographic sample, particularly to a preparation method of a conductive scanning metallographic sample. The invention solves the problems of no conductibility of the scanning metallographic sample, homogeneous distribution of a conductive filling material and poor adhesive property between the conductive filling material and a base material. The method comprises the following steps of: selecting ebonite dust as the base material; selecting carbon soot as the conductive filling material, and adding the ebonite dust and the carbon soot in the volume proportion of 5:(2-3) into a container containing alcohol; heating the container to the temperature of 100DEG C, and stirring for 30 minutes; pouring out the mixture out offrom the container, and drying at the temperature of 50-100DEG C; pulverizing a dried composite material; putting the prepared powder into a mould, heating to the temperature of 130-150DEG C, simultaneously applying pressure to the mould, and retaining heat and pressure for 8-10 minutes; and taking out a sample to finish the preparation of the metallographic sample. The invention improves the adhesive property between the conductive filling material and the base material, and the conductive filling material is homogeneously distributed; the metallographic sample has stable physical-mechanical performance.

Description

technical field

[0001] The invention relates to a method for preparing a scanning metallographic sample, belonging to the technical field of metallographic sample preparation. Background technique

[0002] When doing material scanning electron microscope metallographic observation, it is required that the metallographic sample and the sample platform must be electrically connected, and some scanning electron microscope metallographic observation samples need to be processed into a certain shape and size due to various reasons. The traditional method is to test Put the metallographic sample into a mold of a certain shape, add organic polymer fillers such as bakelite powder or electric jade powder, and then apply pressure and raise the temperature to 120-130°C to solidify to prepare the sample. The sample prepared by this method has certain strength and hardness, high sample preparation efficiency, low price, and is convenient for polishing and grinding. However, since the fi...