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Method and system for in situ testing of metal combustion susceptibility characteristics

An in-situ testing and sensitive technology, applied in the field of spectral detection, can solve problems such as low resolution, inability to reflect changes in material structure, and poor accuracy of Raman spectral analysis, so as to improve accuracy and ensure accurate and reliable Raman spectral line information Effect

Active Publication Date: 2022-06-21
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, although the use of photoionization efficiency spectroscopy and infrared spectroscopy can observe the combustion process in situ, it can also reflect the mutation process of ionization energy, but due to the low resolution, it cannot reflect the structural changes of substances; while Raman spectroscopy is a kind of fingerprint Spectrum, which can reflect changes in material structure, but the accuracy of Raman spectrum analysis under high temperature conditions is poor, and the Raman signal at the moment of ignition cannot be accurately obtained, and thus the sensitivity characteristics of metal combustion cannot be analyzed

Method used

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  • Method and system for in situ testing of metal combustion susceptibility characteristics
  • Method and system for in situ testing of metal combustion susceptibility characteristics
  • Method and system for in situ testing of metal combustion susceptibility characteristics

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Embodiment 1

[0067] The adopted system includes: sample stage, high-temperature plasma spray gun, dual colorimetric infrared thermometer, short-wavelength pulsed laser light source, Raman probe, Raman signal processing device, digital delay signal generator, and high-speed infrared photography device.

[0068] The method for in-situ testing of metal combustion susceptibility characteristics includes the following steps.

[0069] The metal sample pure titanium was fixed on the sample stage and placed in the air with a pressure of 0.10MPa. A short-wavelength pulsed laser light source is used to emit short-wavelength pulsed laser light and irradiate it on the surface of the metal sample, and the dual-colorimetric infrared thermometer and Raman probe are used to calibrate the pure titanium of the metal sample, so that the dual-colorimetric infrared thermometer can be used during the heating process. The position of temperature measurement, the position of short-wavelength pulsed laser irradiat...

Embodiment 2-15

[0075] Referring to the device and method of Example 1, the metal sample, gas type, pressure, heating method, maximum heating temperature, heating rate, pulse time and spectrum frequency test conditions in Table 1 were used to test the metal combustion sensitivity characteristics in situ. Among them, the metal samples of Examples 13-15 were placed in a closed chamber with an observation window, and after vacuuming, they were filled with pure oxygen of 0.09 MPa, 0.17 MPa, and 0.17 MPa, respectively, so that the metal samples were burned under the condition of pure oxygen; The metal samples of other examples were placed in air with a pressure of 0.10 MPa for combustion.

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Abstract

This application relates to the field of spectral detection technology, and provides a method and system for in-situ testing of metal combustion sensitivity characteristics. The method includes the steps of: heating a metal sample to combustion; monitoring the surface temperature of the metal sample in real time from heating to the end of combustion; Use short-wavelength pulsed laser to irradiate the surface of metal samples to generate Raman signals; collect and process the Raman signals of metal samples from heating to the end of combustion to obtain Raman spectra; among them, the pulses of short-wavelength pulsed lasers and the collection of Raman signals It is carried out in a time-series synchronous manner; the surface temperature and Raman spectrum of the metal sample are analyzed to obtain the phase change information at the instant of ignition, thereby obtaining the combustion sensitivity characteristics of the metal. The method provided by this application can effectively remove the influence of the blackbody radiation signal generated by the metal under high temperature on the Raman signal, improve the accuracy of Raman spectral analysis, accurately obtain the Raman signal at the moment of ignition, and then analyze and obtain the metal Combustion Sensitivity Characteristics.

Description

technical field [0001] The present application relates to the technical field of spectral detection, and in particular, to a method and system for in-situ testing of metal combustion sensitivity characteristics. Background technique [0002] Metal combustion often occurs in extreme conditions such as high temperature, high pressure, oxygen enrichment, high-speed impact and high-speed friction. It is different from general oxidation. The moment of ignition is often accompanied by typical sudden changes in temperature, size reduction, and generation of visible light. The essential mechanism of the ignition moment is still unclear, and the ignition mechanism has always been the focus of research. [0003] At present, the methods of studying the combustion process of metals mainly include photoionization efficiency spectroscopy, infrared spectroscopy and Raman spectroscopy. Among them, although the photoionization efficiency spectrum and infrared spectrum can be used to observe...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/12G01N21/01G01N21/65
CPCG01N31/12G01N21/01G01N21/65
Inventor 张诚何康黄进峰王凤平汪从珍李志斌
Owner UNIV OF SCI & TECH BEIJING