The Existence Form and Distribution of Mn in Production of Tungsten Products
The effect of doping different content of Mn into ammonium paratungstate (APT) on the production of tungsten products was studied systematically. The calcination of APT, reduction of WO3 and carbonization of W were studied in sequence.The phase composition, powder morphology, existence form and distribution of Mn were analyzed by X-ray diffraction, scanning electron microscope and transmission electron microscope, respectively. The results showed that Mn converted from MnCl2 to Mn2+WO4 during reduction process. And then Mn2+WO4 converted to Mn5C2 in the process of carbonization. Besides, Mn finally existed as the form of (Mn, W) C solid solution and Mn5C2. The distribution of Mn was always in the low contrast areas.
Y. L. Li et al., "The Existence Form and Distribution of Mn in Production of Tungsten Products", Applied Mechanics and Materials, Vol. 628, pp. 33-39, 2014