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Method for detecting spatial quantitative uniformity distribution of calcium elements in magnesia-alumina spinel based on LIBS

A magnesium-aluminum spinel and detection method technology, applied in the field of element spatial distribution detection, can solve the problems of element content measurement error, weakening deviation, etc., and achieve the effect of improving accuracy, weakening deviation, and reducing signal fluctuations

Inactive Publication Date: 2022-01-28
SOUTHWEST JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

[0004] Although the intensity of the analysis line is directly proportional to the element content, the spectral intensity will change due to factors such as matrix effects and laser pulse energy fluctuations, which will directly bring errors to the element content measurement. In order to solve this problem, this paper proposes A LIBS-based detection method for the spatial quantitative uniformity distribution of calcium in magnesium-aluminum spinel, through spectral preprocessing, the analysis line peak intensity after intensity normalization processing no longer includes the part of the error fluctuation, that is, using the intensity The normalization method can make the relative peak intensity value of the spectral line obtained under the same condition. By calculating the peak intensity ratio of the line to be analyzed and the calibration line, the deviation caused by various parameter fluctuations can be weakened, and the plasma signal rise can be reduced. It is beneficial to improve the measurement repetition rate and measurement accuracy

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  • Method for detecting spatial quantitative uniformity distribution of calcium elements in magnesia-alumina spinel based on LIBS
  • Method for detecting spatial quantitative uniformity distribution of calcium elements in magnesia-alumina spinel based on LIBS
  • Method for detecting spatial quantitative uniformity distribution of calcium elements in magnesia-alumina spinel based on LIBS

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Embodiment 1

[0040] A method for detecting the spatial quantitative uniformity distribution of calcium in magnesium-aluminum spinel based on LIBS, specifically comprising the following steps:

[0041] Step 1. Sample preparation: prepare samples containing different calcium concentrations by adding calcium oxide to the main raw material of magnesium aluminate spinel, and make tablet samples;

[0042] Step 2. Array scanning: the tableted sample prepared in step 1 is placed on a three-axis displacement platform, and the array scanning is performed by laser-induced breakdown spectroscopy to obtain the distribution of spectral intensity values ​​of the elements to be measured on the sample;

[0043] Step 3. Wavelength positioning: According to the one-to-one correspondence relationship between wavelengths and elements in LIBS spectral data, find out the corresponding wavelengths of magnesium, aluminum, and calcium elements;

[0044] Step 4, establish a calibration curve: after preprocessing all...

Embodiment 2

[0047] This embodiment is an improvement of the previous embodiment, a method for detecting the spatial quantitative uniformity distribution of calcium in magnesium-aluminum spinel based on LIBS, specifically comprising the following steps:

[0048] Step 1. Sample preparation: mix magnesium oxide and aluminum oxide with a mass fraction ratio of 3:7, and then add calcium oxide powders with different mass fractions. Among them, alumina powder, magnesium oxide powder and calcium oxide powder are respectively selected from CAS 1344-28- 1. CAS1309-48-4 and CAS 1305-78-8, to obtain five kinds of mixed powders with different mass fractions, the mass fractions of calcium oxide are 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, three kinds of powders After mixing, fully grind and dry, and use a tablet press to maintain a pressure of 10MPa for 5 minutes. The powder after mixing the three powders is made into a circular sample with a diameter of 10mm and a thickness of 1mm. The sample mass is 0.2g, and ea...

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Abstract

The invention discloses a method for detecting spatial quantitative uniformity distribution of calcium elements in magnesia-alumina spinel based on LIBS. The method specifically comprises the following steps: 1, preparing a sample; 2, carrying out array scanning; 3, carrying out wavelength positioning; 4, establishing a calibration curve; and 5, establishing a distribution diagram: establishing a visual distribution diagram of the mass fraction of calcium elements according to the calibration curve of the calcium elements established in the step 4. The invention relates to the technical field of element space distribution detection. The LIBS-based detection method for spatial quantitative uniformity distribution of the calcium elements in the magnesia-alumina spinel reduces the influence of plasma signal fluctuation, is beneficial to improving the measurement repetition rate and the measurement precision, realizes rapid spatial quantitative uniformity distribution detection of the calcium element in the magnesia-alumina spinel, has the characteristics of simple operation, rapid on-site analysis and the like, and can provide reference for developing a portable instrument for detecting spatial quantitative uniformity distribution of the calcium element in the magnesia-alumina spinel.

Description

technical field [0001] The invention relates to the technical field of element spatial distribution detection, in particular to a LIBS-based detection method for the quantitative uniformity distribution of calcium element space in magnesium-aluminum spinel. Background technique [0002] Magnesium-aluminum spinel transparent ceramics have excellent mechanical properties, high optical transmittance in the infrared range, excellent corrosion resistance and wear resistance, and are widely used in transparent armor, missile fairings, spacecraft windows and other fields. In the process of preparing magnesia-alumina spinel by non-reactive sintering, different contents of calcium oxide are often added as a sintering aid. Experiments show that the uniformity of sintering aid calcium oxide in the mixture has an important influence on the optical and mechanical properties of magnesium aluminum spinel ceramics. Therefore, the detection of the spatial distribution of calcium in magnesia...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71G01N1/28
CPCG01N21/718G01N1/286
Inventor 柯川温起帆赵勇
Owner SOUTHWEST JIAOTONG UNIV