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Metallographic preparation method of lead-bismuth alloy

A lead-bismuth alloy and sample technology, applied in the field of metallographic preparation of lead-bismuth alloy, can solve the problems of inability to eliminate the deformation layer, affecting the judgment of the second phase, short operation time, etc. Easy-to-use effects

Inactive Publication Date: 2021-07-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the article "Preparation Method of Metallographic Sample of Lead-Bismuth Alloy" published by Xia Wen et al., the metallographic sample was prepared by mechanical polishing with ammonia water + hydrogen peroxide solution. It was found that the surface of the sample was seriously polluted, which affected the second phase, inclusions and the judgment of holes; R.M.Slepian et al. used ammonium molybdate + citric acid + nitric acid + deionized water as the etchant in the article "Improved Metallographic Preparation of lead andlead alloy". This etchant cannot eliminate the deformed layer, and the metallographic structure exists Illusion; in the patent "a metallographic sample preparation method for lead-bismuth alloy", electrolytic polishing is performed with perchloric acid and glacial acetic acid as the electrolyte, and a clear structure can be observed, but the reagent perchloric acid used is highly corrosive , and there are dangers such as room temperature decomposition, heating and explosion, and the operation process is required to be short, the repeatability of sample preparation is poor, and the yield is low

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  • Metallographic preparation method of lead-bismuth alloy
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Embodiment 1

[0052] Lead-bismuth alloy (Pb:Bi=44:55, wt.%) is ground on 400#, 800#, 1200#, 2000# SiC sandpaper in turn, mechanically polished on a 300r / min polishing machine for 1-2min, and used throughout the process Anhydrous ethanol is used as a polishing lubricant, and then shaken in a chemical polishing agent with a volume ratio of acetic acid and hydrogen peroxide of 3:1 for 3 to 5 seconds, taken out and cleaned with absolute ethanol, and then mechanically polished. Repeat the process 2 to 3 times to obtain Bright mirror surface; etched in the same composition of etchant for 5s, rinsed with absolute ethanol and dried with cold air, you can get attached figure 2 In the microstructure photo (400X), the microstructure is a eutectic composed of pure bismuth (light phase) and lead-bismuth intermetallic compound (dark phase).

Embodiment 2

[0054] Lead-bismuth alloy (Pb:Bi=44:55, wt.%) is roughly ground on 400#, 800#, 1200#, 2000# SiC sandpaper in turn, and mechanically polished on a 300r / min polishing machine for 1 to 2 minutes. Use absolute ethanol as a polishing lubricant, and then shake it in a chemical polishing agent with a volume ratio of acetic acid and hydrogen peroxide of 3:1 for 3 to 5 seconds, take it out and clean it, and continue mechanical polishing. Repeat the process 2 to 3 times to obtain a bright mirror surface; Etched in the same composition of etchant for 8s, rinsed with absolute ethanol and dried with cold air, the attached image 3 In the microstructure photo (400X), the microstructure is a eutectic composed of pure bismuth (light phase) and lead-bismuth intermetallic compound (dark phase).

Embodiment 3

[0056] Lead-bismuth alloy (Pb:Bi=44:55, wt.%) is ground on 400#, 800#, 1200#, 2000# SiC sandpaper in turn, mechanically polished on a 300r / min polishing machine for 1-2min, and used throughout the process Anhydrous ethanol is used as a polishing lubricant, and then shaken in a chemical polishing agent with a volume ratio of acetic acid and hydrogen peroxide of 3:1 for 3 to 5 seconds, taken out and cleaned, and then mechanically polished. The process is repeated 2 to 3 times to obtain a bright mirror surface; Corrode in an etchant of the same composition for 12 seconds, rinse with absolute ethanol and dry with cold air to obtain attached Figure 4 In the microstructure photo (400X), the microstructure is a eutectic composed of pure bismuth (light phase) and lead-bismuth intermetallic compound (dark phase).

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Abstract

The invention provides a metallographic preparation method of a lead-bismuth alloy, relates to the technical field of metallographic preparation, and aims to obtain a metallographic microstructure which is clear in surface appearance and free of deformation and illusion and effectively avoid oxidation of a product. The method comprises the steps: S1, cutting the lead-bismuth alloy into a sample with proper size; S2, carrying out mechanical coarse grinding on the sample; S3, polishing the roughly ground sample, wherein the polishing process specifically comprises the steps of alternately carrying out mechanical polishing and chemical polishing for a plurality of times; S4, judging whether corrosion is carried out or not, and if corrosion is carried out, corroding and analyzing the polished sample; otherwise, entering the next step; and S5, carrying out anti-oxidation storage on the sample. The method provided by the invention is suitable for the metallographic preparation process of the lead-bismuth alloy.

Description

technical field [0001] The invention relates to the technical field of metallographic preparation, in particular to a metallographic preparation method of a lead-bismuth alloy. Background technique [0002] Lead-bismuth alloys have become the preferred choice for heavy metal spallation targets in fission reactor coolants and nuclear waste transmutation (ADS) systems because of their good thermal properties, such as high thermal conductivity, low melting point, high boiling point, chemical inertness, and low saturated vapor pressure. important candidate material. Lead-bismuth alloy undergoes repeated melting-solidification phase transformation process during service, and the solidification structure directly determines the volume expansion behavior and mechanical properties of the alloy. Therefore, observing and quantitatively studying the metallographic structure of lead-bismuth alloy is very important for the safe and reliable operation of the reactor. The study of metall...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/32G01N1/34
CPCG01N1/28G01N1/32G01N1/34
Inventor 张晓新展冉燕青芝
Owner UNIV OF SCI & TECH BEIJING