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- W2364380738 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 processed by atmospheric plasma spraying (APS) to form a coating. The oxidation characteristics and laser irradiation melting characteristics of the tungsten coatings with or without LaH 2 addition were investigated and compared. The results showed that the coatings exhibited typical splat/lamellar microstructure. WO 3 , which was distributed between lamellar layers or in splats, formed in the APS-W coating by the oxidation reaction between W and O 2 . The introduction of LaH 2 in the tungsten-based coating led to forming WO 2 by a deoxidization of WO 3 . La 2 O 3 with a morphology of long strip, which was distributed mainly between lamellar layers and had a filling effect on the pores, formed in the APS-W/LaH 2 coating by the oxidation reaction between La/LaH 2 and WO 3 /O 2 . The oxide/oxygen content and the porosity of the APS-W/LaH 2 coating were apparently lower than those of the APS-W coating; and the relative density and thermal conductivity of the former were higher than those of the latter. The trends of the crack to form in the APS-W/LaH 2 coating were lower than that in the APS-W coating when the two types of coatings were irradiated by a laser. The coarse elongated tungsten grains formed in laser irradiation melting sample for the APS-W coating. But the fine equiaxial tungsten grains formed in laser irradiation melting sample for the APS-W/LaH 2 coating, which was mainly the result of the pinning effect of the re-precipitated spherical La 2 O 3 particles on the re-crystalline tungsten grain boundaries. The ability of the APS-W/LaH 2 coating to resist high heat loading was greater than that of the APS-W coating." @default.
- W2364380738 created "2016-06-24" @default.
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- W2364380738 date "2016-08-01" @default.
- W2364380738 modified "2023-09-24" @default.
- W2364380738 title "Influence of LaH2 on oxidation characteristics and irradiation melting characteristics of a tungsten coating fabricated by atmospheric plasma spraying" @default.
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- W2364380738 doi "https://doi.org/10.1016/j.surfcoat.2016.05.029" @default.
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