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A method for observing metallographic structure of industrial pure hafnium

A metallographic structure, industrially pure technology, applied in the field of observation of industrial pure hafnium metallographic structure, can solve problems such as difficult to obtain clear structure, achieve easy control and mastery, avoid misjudgment, smooth and bright effect

Active Publication Date: 2020-09-15
西安汉唐分析检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively solve the problem that it is difficult to obtain a clear structure of the existing industrial pure hafnium metallographic samples, and avoid the disadvantages of unclear metallographic structure observed and easy judgment errors due to improper polishing and corrosion; the method adopts The corrosion solution erodes the metallographic observation plane of the hafnium sample after chemical polishing, and then anodizes it to form an oxide film on the surface of the metallographic observation plane of the hafnium sample, and then anodizes the hafnium sample after the film The metallographic observation plane adopts polarized light observation method for metallographic observation, and the oxide film on the metallographic observation surface can accurately reflect the metallographic structure of hafnium when observed by polarized light

Method used

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  • A method for observing metallographic structure of industrial pure hafnium
  • A method for observing metallographic structure of industrial pure hafnium
  • A method for observing metallographic structure of industrial pure hafnium

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Embodiment 1

[0033] The observation method of the present embodiment comprises the following steps:

[0034] Step 1. Machining a metallographic observation plane on the surface of an industrial pure hafnium bar with a specification of Φ12mm, and then grinding the machined metallographic observation plane on a metallographic grinder. # 、500 # , 800 # and 1000 # The metallographic water sandpaper is ground step by step, and the grinding direction is rotated 90° every time the metallographic water sandpaper is replaced to ensure that the last grinding trace is completely eliminated, and the sand grains on the metallographic observation plane are washed away after grinding;

[0035] Step 2, immerse the metallographic observation plane of the grit in step 1 and immerse it in the chemical polishing solution and polish it for 30s; the chemical polishing solution is composed of ethanol, hydrogen fluoride, deionized water, concentrated sulfuric acid and deionized water according to 4:1:10: The v...

Embodiment 2

[0041] The observation method of the present embodiment comprises the following steps:

[0042] Step 1. Machining a metallographic observation plane on the surface of an industrial pure hafnium bar with a specification of Φ20mm, and then grinding the machined metallographic observation plane on a metallographic grinder. # 、500 # , 800 # and 1000 # The metallographic water sandpaper is ground step by step, and the grinding direction is rotated 90° every time the metallographic water sandpaper is replaced to ensure that the last grinding trace is completely eliminated, and the sand grains on the metallographic observation plane are washed away after grinding;

[0043] Step 2, immerse the metallographic observation plane of the grit in step 1 and immerse it in the chemical polishing solution and polish it for 45s; the chemical polishing solution is composed of ethanol, hydrogen fluoride, deionized water, concentrated sulfuric acid and deionized water according to 5:1:12: The v...

Embodiment 3

[0048] The observation method of the present embodiment comprises the following steps:

[0049] Step 1. Machining a metallographic observation plane on the surface of an industrial pure hafnium bar with a specification of Φ16mm, and then grinding the machined metallographic observation plane on a metallographic grinder. # 、500 # , 800 # and 1000 # The metallographic water sandpaper is ground step by step, and the grinding direction is rotated 90° every time the metallographic water sandpaper is replaced to ensure that the last grinding trace is completely eliminated, and the sand grains on the metallographic observation plane are washed away after grinding;

[0050] Step 2, immerse the metallographic observation plane of sand grains in step 1 into the chemical polishing solution and polish for 60s; the chemical polishing solution is composed of ethanol, hydrogen fluoride, deionized water, concentrated sulfuric acid and deionized water according to 6:2:12: The volume ratio o...

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Abstract

The invention discloses an observation method of an industrial pure-hafnium metallographic structure. The method includes the steps: firstly, machining a metallographic observation plane on an industrial pure-hafnium surface, grinding the metallographic observation plane, and flushing out sand grains on the metallographic observation plane; secondly, soaking the metallographic observation plane without the sand grains into a chemical polishing solution to polish the metallographic observation plane; thirdly, soaking the polished metallographic observation plane into corrosive solution to corrode the metallographic observation plane; fourthly, taking the corroded metallographic observation plane as a positive pole, taking a lead plate as a negative pole, soaking the metallographic observation plane into electrolyte, and performing positive pole oxidation treatment on the metallographic observation plane under the condition of indoor temperature; fifthly, placing the metallographic observation plane after positive pole oxidation treatment under a metallographic microscope, and observing the metallographic structure in a polarization observation mode. The method can effectively solvethe problem that an existing industrial pure-hafnium metallographic sample difficultly acquires a clear structure. The method overcomes the shortcomings of unclear observed metallographic structures and easiness in misjudgment caused by improper polishing and corrosion.

Description

technical field [0001] The invention belongs to the technical field of metallographic structure observation of metal materials, and in particular relates to a method for observing the metallographic structure of industrial pure hafnium. Background technique [0002] Hafnium is more and more used in the nuclear industry due to its good welding performance, high temperature resistance and corrosion resistance. Its large thermal neutron capture cross-section is an ideal neutron absorber, and it has become a control rod and protection device for nuclear reactors. important material. In order to study the performance of hafnium, it is necessary to observe its microstructure to determine the structure type and its uniformity, so as to help improve the performance of hafnium. When using the observation method in the prior art to observe the metallographic structure of hafnium, it is difficult to obtain a clear microstructure due to the processing method of the metallographic obser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84G01N1/28G01N1/32
CPCG01N1/286G01N1/32G01N21/84G01N2001/2866
Inventor 何伟马红征杨军红武晶晶石科学杜小平惠晓原
Owner 西安汉唐分析检测有限公司
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