Conclusions
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1.
The feasibility is demonstrated of removing 95–100% of oxides from atomized iron powders by ultrasonic pickling.
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2.
Although all powder fractions are characterized by high and almost identical coefficients of ultrasonic purification, the absolute residual amount of oxygen in a purified powder depends on its particle size, decreasing from 0.4% for fine fractions to virtually zero for coarse fractions.
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3.
The optimum conditions of ultrasonic pickling (5-min treatment at a liquid: solid weight ratio of 2∶1) have been determined.
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4.
It is shown that the degree of purification of powders from oxides can be rapidly assessed by an optical analysis in which measurement time does not exceed 2–3 min.
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Literature cited
I. I. Odokienko, S. M. Solonin, and O. S. Nichiporenko, “Influence of composition of the working liquid on the effectiveness of ultrasonic purification of atomized powders,” Poroshk. Metall., No. 9, 90–92 (1976).
A. I. Raichenko, Introduction to the Photometry of Metal Powders [in Russian], Naukova Dumka, Kiev (1973).
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Translated from Poroshkovaya Metallurgiy'a, No. 11(179), pp. 10–14, November, 1977.
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Odokienko, I.I., Solonin, S.M. & Nichiporenko, O.S. Effect of particle size of metal powders on their degree of ultrasonic purification in a pickling solution. Powder Metall Met Ceram 16, 829–832 (1977). https://doi.org/10.1007/BF00797034
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DOI: https://doi.org/10.1007/BF00797034