Method for analyzing and detecting solid solubility of tungsten in cemented carbide binding phase

A technology of cemented carbide and detection method, which is applied in the field of quantitative analysis of solid solution tungsten element content in cemented carbide binder phase by X-ray energy spectrum, can solve the problems of inability to quantitatively analyze the content of tungsten element, unable to use separation, etc., and achieve intuitive The effect of accurate reference data, improved accuracy, and high detection efficiency

Inactive Publication Date: 2014-02-19
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the cemented carbide binder phase is wrapped around the WC phase, the Co layer is thin, generally 1-5um, and it is impossible to separate the WC phase from the cobalt phase by mechanical crushing methods. Therefore, conventional chemical analysis or instrumental analysis Unable to quantitatively analyze the content of solid-dissolved tungsten in the cemented carbide binder phase

Method used

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  • Method for analyzing and detecting solid solubility of tungsten in cemented carbide binding phase
  • Method for analyzing and detecting solid solubility of tungsten in cemented carbide binding phase
  • Method for analyzing and detecting solid solubility of tungsten in cemented carbide binding phase

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: Analysis and detection of the solid solubility of tungsten in the bonding phase Co in WC-Co cemented carbide

[0028] First, prepare a smooth metallographic polished surface from the WC-Co cemented carbide sample to be tested; (the following examples are the same)

[0029] Then, the hard phase WC on the metallographic polished surface is peeled off by using electrolytic separation, a chemical separation technology. The electrolyte solution for electrolytic separation is NaOH or KOH strong alkali solution with a mass percentage of 20-40%. The electrolytic current is controlled at 0.1-0.5A. The electrolytic anode is made of hard alloy, and the cathode is made of pure titanium plate. After the electrolysis is completed, the impurities and oxide layer on the sample surface are removed, and the sample to be tested that has been stripped of the hard phase is prepared on the metallographically polished surface, (the following examples are the same); Analysis showed...

Embodiment 2

[0038] Example 2: Analysis and detection of the solid solubility of tungsten in the binder phase (Co+Ni) in WC-(Co+Ni) cemented carbide, where a small amount of Cr is added to the (Co+Ni) binder phase

[0039] First, the sample to be tested is prepared with a smooth metallographic polished surface. Then the hard phase WC is peeled off, and the sample surface impurities and oxide layer are removed, and the sample to be tested is prepared; observation and X-ray energy spectrum analysis have no obvious oxide layer and precipitates, such as Figure 4 As shown in , it shows that the hard phase WC on the metallographic polishing surface has been completely stripped from the bonding phase (Co+Ni).

[0040] Next, optimize the calibration settings of the X-ray energy spectrometer by using the pure Co binder phase standard sample, and save it at the same time;

[0041] Then select a cobalt-based cemented carbide sample with a known mass percentage of 5% W+95% Co as the standard sample ...

Embodiment 3

[0045]Example 3: Analysis and detection of the solid solubility of tungsten in the binder phase (Co+Ni) in WC-(Co+Ni) cemented carbide, including a small amount of Ni in the (Co+Ni) binder phase 3 Al phase

[0046] First, the sample to be tested is prepared with a smooth metallographic polished surface. Then the hard phase WC is peeled off, and the sample surface impurities and oxide layer are removed, and the sample to be tested is prepared; observation and X-ray energy spectrum analysis have no obvious oxide layer and precipitates, such as Figure 4 As shown in , it shows that the hard phase WC on the metallographic polishing surface has been completely stripped from the bonding phase (Co+Ni).

[0047] Next, the X-ray spectrometer calibration settings were optimized using pure Co standard samples and saved at the same time.

[0048] Then select a cobalt-based cemented carbide sample with a known mass percentage of 5% W+95% Co as the standard sample for X-ray energy spectru...

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Abstract

The invention discloses a method for analyzing and detecting solid solubility of tungsten in a cemented carbide binding phase. The method sequentially comprises the steps as follows: preparing a metallographic polished surface of a sample to be detected; stripping a hard phase on the metallographic polished surface by using an isolation technology, and eliminating surface impurities and oxide layers; optimizing an X-ray energy dispersive spectrometer calibration device by a pure Co binding phase sample; selecting a cobalt-base alloy sample with known components as an analysis standard sample, obtaining a correction factor with a matrix correction method (ZAF method) according to a theoretical value of the standard sample and the actual testing result, saving the correction factor as standard sample database, and determining working parameters of an optimum scanning electron microscope for analysis of the sample to the detected according to the detection result of the standard sample; and taking data and relevant parameters built by the cobalt-base alloy with solid solubility W of 5% as an X-ray energy spectrum quantitative standard database file, and performing repeated and multi-point measurement on the sample to the detected in different fields of view, wherein an arithmetic mean of the sample to be detected is the solid solubility of the tungsten in the binding phase of the sample to be detected. According to the method, the solid solubility of the tungsten in the cemented carbide binding phase is analyzed and detected, and the accuracy is high.

Description

technical field [0001] The invention relates to a method for analyzing and detecting the solid solubility of tungsten in a cemented carbide bonding phase, in particular to quantitatively analyzing the solid-solution tungsten element content in the cemented carbide bonding phase by using an X-ray energy spectrum. Background technique [0002] The solid solution content of tungsten in the cemented carbide binder phase has a crucial influence on the physical properties and performance of the cemented carbide. Analyzing the solid solution content of tungsten in the cemented carbide phase can provide reliable information for controlling the quality of cemented carbide products. Assure. The chemical composition of cemented carbide, carbon content control, sintering process system, subsequent heat treatment, etc. are all important factors affecting the solid solution content of tungsten in the alloy binder phase, and ultimately affect the physical properties and performance of ceme...

Claims

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Application Information

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IPC IPC(8): G01N23/22
Inventor 谢晨辉彭宇周华堂谭立群郭建中
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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