What are the testing methods for material composition? Common detection techniques

Date：2022-11-23 15:19:35Views：2500

Component analysis refers to the technical method of analyzing the components of products or samples through scientific analysis methods, and conducting qualitative and quantitative analysis on each component. In order to help you understand deeply, this article will summarize the relevant knowledge of material composition testing. If you are interested in the content to be covered in this article, please read on.

Material analysis can be divided into three aspects: determination of material structure, observation of material morphology and analysis of material composition. Material composition analysis is mainly to conduct qualitative and quantitative analysis on the composition of samples by means of detection.

Several commonly used material composition analysis methods are introduced as follows:

1. Chemical analysis method:The analytical method based on the chemical reaction of substances is called chemical analysis method. Each substance has its own unique chemical characteristics. We can use the chemical reaction between substances to characterize them with appropriate methods to indicate the reaction process, so as to obtain the content of some binding components in the substances.

2. Atomic spectrometry:Atomic spectrum is the photon energy spectrum of atomic absorption or emission intensity (usually expressed by wavelength), which can provide the chemical composition information of the sample. Atomic spectrum can be divided into three categories: atomic absorption spectrum, atomic emission spectrum and atomic fluorescence spectrum;

3. X-ray energy spectrum (EDX):EDX is often used in conjunction with an electron microscope to measure the wavelength and intensity of characteristic X-ray generated by the interaction between electrons and samples, so as to conduct qualitative or quantitative analysis of elements contained in a small area. Each element has a characteristic X-ray corresponding to a specific wavelength, which does not change with the energy of the incident electron. The type of elements in the sample can be determined by measuring the type of characteristic X-ray wavelength generated by the electronic excitation of the sample. The element content is in direct proportion to the characteristic X-ray intensity generated by the element, according to which the element content can be determined.

4. Electronic energy spectrum analysis:Electron spectroscopy analysis is to irradiate the sample with monochromatic light source or electron beam, so that the electrons in the sample are excited and emitted, and then measure the intensity and energy distribution of these electrons to obtain material information. The sampling depth of EDS is only a few nanometers, so it is only a reaction of surface components.

5. X-ray diffraction (XRD):XRD can also be used to assist in quantitative phase analysis. This is based on the fact that the diffraction intensity of the phase increases with the increase of the content. However, this is disproportionate and needs to be corrected.

6. Mass spectrum (MS):An analytical method that ionizes the measured substance, separates it according to the mass charge ratio of ions, and measures the intensity of various ion spectral peaks to achieve the purpose of analysis. Mass is one of the inherent properties of matter. Different substances have different mass spectra (mass spectra for short). This property can be used for qualitative analysis; The peak intensity is also related to the content of the compounds it represents, which can be used for quantitative analysis;

7. Spectrophotometry:The spectrophotometer uses a light source that can generate multiple wavelengths. Through a series of spectroscopic devices, it can be used for quantitative analysis to generate light sources of specific wavelengths. After the light passes through the tested sample, part of the light is absorbed. Calculate the absorbance value of the sample and convert it to the concentration of the sample. The absorbance value is proportional to the sample concentration. Including visible spectrophotometer and ultraviolet spectrophotometer.

8. Spark direct reading spectrometer:The spark direct reading spectrometer makes use of the high temperature of the electric spark to make the elements in the sample evaporate directly from the solid state and be excited to emit the characteristic wavelength of each element. After the grating spectrophotometer is used, it becomes a "spectrum" arranged by wavelength. The characteristic spectral lines of these elements pass through the exit slit and inject their respective wavelengths into the photomultiplier tube. The optical signals are converted into electrical signals, integrated by the control and measurement system of the instrument and converted into a/D, and then processed by the computer to print out the percentage content of each element.

The above contents are related to the material composition detection methods organized by the wound core detection team. I hope they can help you. Our company has a team of professional engineers and industry elites, and has built three standardized laboratories with an area of more than 1800 square meters, which can undertake a variety of test projects such as electronic component test verification, IC authenticity identification, product design material selection, failure analysis, functional testing, factory incoming material inspection and tape weaving.