Testing the purity of molybdenum crucibles is essential to ensure their performance in demanding environments such as high-temperature melting, single crystal growth, and chemical experiments. Molybdenum crucibles with high purity have better high-temperature resistance, chemical stability, and service life. The following are several common and effective molybdenum purity testing methods:
- Commonly used molybdenum crucible purity detection methods
| method | principle | Detectable items | Features |
| Inductively coupled plasma optical emission spectroscopy (ICP -OES) | High temperature plasma excited sample element emission spectrum | Impurity metal elements (Fe, Ni, Cu, etc.) | Simultaneous detection of multiple elements with high sensitivity |
| Glow Discharge Mass Spectrometry (GDMS) | Glow discharge sputters the sample into ions in a vacuum and then performs mass spectrometry analysis | Dozens of trace impurities | High precision, up to ppb level |
| Spark Optical Emission Spectroscopy (Spark-OES) | High-energy sparks excite metal surfaces to produce emission spectra | Conventional metal impurities | Fast, suitable for industrial batch testing |
| X-ray fluorescence spectroscopy (XRF) | X-ray excited elements emit characteristic X-ray spectra | Surface impurity element content | Fast, non-destructive, and can be tested on site |
| Atomic Absorption Spectroscopy (AAS) | Detects the absorption of an element at a specific wavelength | Specific impurities (such as lead, iron) | Sensitive and targeted |
| Oxygen, Nitrogen and Hydrogen Analyzer ( ONH ) | Decomposition of O/N/H under high temperature reducing conditions and detection of their contents | Gas impurities such as oxygen, nitrogen, and hydrogen | Molybdenum is particularly critical for gases with high purity requirements |
- Preparation of test samples
Mechanical sampling: scrape the surface/inner wall of the crucible to obtain powder or cut small pieces;
Chemically dissolved samples: When used for ICP and AAS analysis, the samples must be digested with acid (such as mixed acid aqua regia);
Direct analysis of the entire sample: XRF or GDMS can be used to directly detect the object or surface.
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