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

Abstract

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. TiO 2 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 (T c ) and combustion velocity (U c ) 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.

Removal of Mg and MgO By-Products through Magnesiothermic Reduction of Ti Powder in Self-Propagating High-Temperature Synthesis

“…Raw materials used in this study included: Ti powder was prepared by SHS using Titanium dioxide powder (TiO2, 99.99 mass%, particle size 2 μm, Kojundo Chemical Laboratory Co., Ltd, Figure 1. XRD analysis results of product of combustion synthesis of TiO 2 + 3Mg system [13].…”

“…We optimized selective leaching to remove Mg and MgO, thus leaving pure Ti powder. We have addressed the synthesis of Ti by the SHS process in a previous study [13]. Figure 1 shows the as-synthesized SHS products consisting of Ti, Mg, and MgO without any other Ti oxides, such as Ti 10 O 9 , Ti 3 O 5 , or Ti 2 O 3 .…”

“…X-ray Diffraction (XRD) images of the sample produced by the SHS process are shown in Figure 1. MgO and residual Mg were detected as reaction by-products in addition to Ti [13]. No intermediate phases such as Ti 10 O 9 , Ti 3 O 5 , or Ti 2 O 3 were identified.…”

A Systematic Literature Review on the Titanium Metal Product Value Chain

“…The combustion synthesis (CS) powder production technique in South Korea. This process involves the direct reduction of TiO2 to Ti during combustion [99]. After combustion the powder is spheredised to prepare the powder for further processing [99].…”