Some influencing factors of spectrometer accuracy
HR-750 photoelectric direct reading spectrometer analysis accuracy, stability is leading domestic, with few failures. Some spectral chambers are not vacuum, replaced by high purity argon? The certificate of the original standard sample of the spectrometer should be preserved. It is the proof that the international standard mass value is transmitted to the spectrometer, which ensures the accuracy of the spectrometer working curve, thus ensuring the accuracy of the analysis. The argon cylinder should be equipped with an argon purifier. The liquid argon tank is of good purity, but it must be equipped with a water removal device. Others such as regulated power supplies, sample polishers, and abrasive belts. The quality of the grinding wheel is not good, the surface of the sample is contaminated, the spectrometer is well grounded, the fatigue caused by long-term work on the surface of the sample mold, regular replacement, etc., all involve its accuracy.
However, the spectrometer needs to be analyzed accurately. In addition to the instrument, the white mouth of the sample is mainly prepared. This means that the carbon is present in the form of compound or solid solution, and any operation or similar operation will affect the operation. Analyze the accuracy of carbon; spheroidized or fermented molten iron, although the chilled sample is already white to the naked eye, but many graphite crystallites have been present on the surface of the sample, and the impact must be accurate. If the sample is polished to look at the metallographic phase, the presence of punctate graphite can be seen. If steel is analyzed, there is no carbon analysis problem because there is no free carbon. The gray iron, ductile iron carbon content is too high, so it must be noted that carbon can not exist in free form, that is, in the chemical state, solid solution state, can not exist in the form of graphite.
So is the chemical analysis of ductile iron carbon accurate? Ordinary sampling methods are not allowed! That is, the iron sample drilled by the drill bit, because the graphite is spherical, the graphite is gathered, and the iron scraps are drilled, and the carbon unevenness and loss are easily generated when the sample is sampled, and the analysis result is often low!
The spectrometer generally analyzes other elements more accurately. In 2009, the second phase of the foundry spectrometer was tendered. The supplier talked about the analysis of the strontium element of the thick ductile iron. It seems that the current international standard of the spectrometer There are still problems.
In addition, in the usual work, I also encountered some problems related to spectrometer analysis:
The white-mouth sample mold of the spectrometer, if the gate is too thick, interferes with the chilling ability of the analytical surface around the gate. The gates are thick, generally for the convenience of grinding samples. A good spectrometer grinding sample machine has a tool for magnets to break the gate sample piece, so it is necessary to pay attention to the size of the molten iron into the sample size. The sample mold gate is thin, generally 4-5 mm in diameter.
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