Abstract
Abstract In this work, as a kind of rare earth hydrides, 1.5 wt.% LaH 2 powder was introduced into a tungsten powder and then deposited by a supersonic atmospheric plasma spraying (SAPS) machine. The purpose was to form La 2 O 3 in the LaH 2 -doped tungsten-based coating. The microstructure and properties of the undoped and LaH 2 -doped tungsten-based coatings were characterized using scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), X-ray diffractometer (XRD), nano-indentation tester and Vickers hardness tester. The results showed that SAPS coatings exhibited typical lamellar microstructure. Pores located mainly at lamellar gaps in association with oxidation were also observed. The type of tungsten oxide was mainly WO 3 . During SAPS process, La 2 O 3 was formed in the LaH 2 -doped tungsten-based coating by the transformation of LaH 2 . The formed La 2 O 3 was distributed mainly at lamellar gaps, having a joining effect on the adjacent lamellae. The oxygen content, porosity and thermal conductivity of the LaH 2 -doped tungsten-based coating were lower than those of the undoped tungsten coating. The introduction of 1.5 wt.% LaH 2 in the tungsten coating improved its ability to resist elastic fracture and improved its fracture toughness.
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