Metal powder is a fine metal powder, usually made by chemical reduction of metal, mechanical grinding or atomization. They have the properties of many metals, such as high electrical conductivity, high thermal conductivity, corrosion resistance, high temperature performance, etc. Metal powders can be used in a variety of applications, such as the preparation of metal materials in the fields of electronic devices, automobiles, aerospace, construction, metallurgy, etc., and added to coatings, paints, inks, rubber, etc. to increase their electrical conductivity, thermal conductivity, corrosion resistance and other properties. In addition, metal powder is also widely used in powder metallurgy, 3D printing, thermal spraying and other fields.
Detection performance
The following is a table of common properties and detection methods that metal powder needs to detect:
| performance | describe | Detection method |
|---|---|---|
| Particle size distribution | Size and distribution of metal powder particles | Laser particle size analyzer, microscope |
| chemical composition | The content and ratio of each element in the metal powder | X-ray fluorescence spectroscopy, ICP-MS, chemical analysis |
| purity | Purity and Impurity Content of Metal Powders | ICPOES, thermogravimetric analysis, gas chromatography-mass spectrometry |
| density | Density and porosity of metal powders | Buoyancy method, mercury intrusion method, microscope |
| magnetic | Magnetic Properties of Metal Powders | Vibrating sample magnetometer, hysteresis loop test |
| surface properties | Surface Morphology, Chemical Reaction and Chemical Composition of Metal Powders | Scanning Electron Microscopy, X-ray Photoelectron Spectroscopy, Chemical Analysis |
Beichao reminds you: Different metal powders may require different detection methods, and which method to choose depends on the nature of the sample and the required detection accuracy.
Specific detection method
The following is a detailed description of metal powder detection:
Particle size and particle size distribution: measure particle size and particle size distribution by laser particle size analyzer, dynamic light scattering instrument and other instruments.
Density: Measured by hydrometer or gas specific gravity method.
Thermogravimetric analysis: The thermal stability and thermal decomposition temperature of materials can be tested with thermogravimetric analyzer (TGA) or differential thermal analyzer (DSC).
Chemical composition: The commonly used methods are X-ray fluorescence spectroscopy (XRF) and atomic absorption spectroscopy (AAS).
Surface properties: Common surface analysis methods include scanning electron microscopy (SEM), transmission electron microscopy (TEM) and atomic force microscopy (AFM).
Magnetic properties: The magnetic properties of materials are tested with equipment such as superconducting quantum interferometers (SQUIDs) and Hall effect meters.
Conductivity: Instruments such as a four-probe resistance Tester can be used to test the conductivity of a material.
Optical properties: Ultraviolet-visible Spectrophotometer (UV-Vis) and other instruments can be used to test the absorption and transmission spectra of materials, as well as optical properties such as fluorescence spectra.
Mechanical properties: Commonly used mechanical property testing methods include tensile, compression, bending and other experiments, as well as instruments such as material testing machines to test the mechanical properties of materials.
These test methods need to be selected according to the specific metal powder type and properties, and combined with a variety of means for comprehensive analysis.
