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Fabrication of a Spherical Titanium Powder by Combined Combustion Synthesis and DC Plasma Treatment

Choi S. H., Ali B., Hyun S. K., Sim J. J., Choi W. J., Joo W., Lim J. H., Lee Y. J., Kim T. S., Park K. T.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 2B

1057--1062

Combustion synthesis is capable of producing many types of refractory and ceramic materials, as well as metals, with a relatively lower cost and shorter time frame than other solid state synthetic techniques. TiO2 with Mg as reductant were dry mixed and hand compacted into a 60 mm diameter mold and then combusted under an Ar atmosphere. Depending on the reaction parameters (Mg concentration 2 ≤ α ≤ 4), the thermocouples registered temperatures between 1160°C and 1710°C . 3 mol of Mg gave the optimum results with combustion temperature (Tc) and combustion velocity (Uc) values of 1372°C and 0.26 cm/s respectively. Furthermore, this ratio also had the lowest oxygen concentration in this study (0.8 wt%). After combustion, DC plasma treatment was carried out to spheroidize the Ti powder for use in 3D printing. The characterization of the final product was performed using X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and N/O analysis.

Production of nickel and nickel-posphorous composite layers containing titanium

Serek A., Budniok A.

Archiwum Nauki o Materiałach

2002

T. 23, nr 1

37-50

The influence of titanium powder content in an electroplating bath on the deposition process of Ni+Ti and Ni-P+Ti composite layers were examined. Composite Ni+Ti and Ni-P+Ti layers were prepared by simultaneous electrodeposition of nickel and titanium on a steel substrate from a Watts bath in which 4, 12, 20, 28 and 40 (g x - cubic dm) of Ti powder were suspended. The electrodeposition was carried out under galvanostatic conditions at temperature of 343 K and current density of jD=0,1 A x -square cm during 0,5 h. The phase composition of the layers was investigated by the X-ray diffraction method. Atomic absorption spectroscopy was used for chemical characterization of the layers. The surface morphology of the coatings was examined by means of a stereoscopic microscope with a morphometric computer system. The percentage volume fraction of Ti as a composite component was determined. Chemical and phase analysis of the Ni+Ti and Ni-P+Ti layers confirmed the co-deposition of Ni and Ti. It was found that the phase structure of the obtained layers depends only on the phosphorous content in the layer. It was also ascertained that the increase of the titanium powder amount in the bath causes the rise in Ti content embedded in the composite layers. The presence of NaH2PO2 in the basic bath reduces the content of embedded Ti in the layers.

W pracy badano wpływ zawartości proszku tytanowego w kąpieli galwanicznej na proces osadzania warstw kompozytowych Ni-P+Ti oraz Ni+Ti na podłożu stalowym. Ustalono wpływ zawartości tytanu w kąpieli galwanicznej na jego zawartość w warstwie kompozytowej. Badania struktury otrzymanych warstw przeprowadzono metodą dyfrakcji promieni rentgenowskich, analizę składu chemicznego wykonano metodą atomowej spektrometrii absorpcyjnej, charakterystykę morfometryczną określono, wykorzystując mikroskop stereoskopowy Nikon. Struktura fazowa otrzymanych powłok Ni+Ti, Ni-P+Ti jest zależna jedynie od obecności fosforu w warstwie. Stwierdzono, że wzrost zawartości proszku tytanowego w kąpieli powoduje wzrost ilości Ti w warstwach kompozytowych. Obecność podfosforynu sodowego w kąpieli do niklowania obniża ilość tytanu w warstwie kompozytowej.