Effects of NaPO 3 concentration in Na 2 WO 4 –WO 3 system on pulse electro-deposition tungsten coating from oxide molten slat

Abstract Electro-deposition technique is an attractive and promising technique to fabricate tungsten armor-coatings. Metallic tungsten coatings were obtained by pulsed electro-deposition on CuCrZr alloy used as a heat sink material. In this study, the effects of NaPO 3 concentration and temperature on the crystal structure and morphologies of the coatings were investigated by XRD and SEM. Metallic tungsten coating was successfully obtained as the NaPO 3 concentration is 30 mol% at the temperature of 1073 K in air atmosphere. XRD results show that the deposited coatings have the metallic tungsten crystal with a body centered cubic (BCC) structure. (2 1 1) orientation was favored most likely for each sample obtained at different temperatures. The average grain size of tungsten coatings was varies in the region of 3–15 μm. And the addition of NaPO 3 have an obviously influence on the decrease of tungsten’s grain size.