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Contact angles of sapphire melt on tungsten (W), tungsten–molybdenum alloy (W–Mo), and molybdenum (Mo) test pieces were observed. The contact angles were 30.1±3.8°, 27.5±4.2°, and 23.5±3.2° for W, W–Mo, and Mo, respectively. Bubbles were generated only in the sapphire melt on W test piece. The contact angle of bubbles on W test piece was 31.2±4.9°. Because of the large contact angle of sapphire melt,...
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