- Microstructural Evolution of Thick Tungsten Deposit Manufactured by Atmospheric Plasma Spray Forming Route
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Joo-Hyun Lim, Kyeong-Ho Baik
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J Korean Powder Metall Inst. 2009;16(6):403-409.
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DOI: https://doi.org/10.4150/KPMI.2009.16.6.403
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 Abstract
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- Plasma spray forming is recently explored as a near-net-shape fabrication route for ultra-high temperature metals and ceramics. In this study, monolithic tungsten has been produced using an atmospheric plasma spray forming and subsequent high temperature sintering. The spray-formed tungsten preform from different processing parameters has been evaluated in terms of metallurgical aspects, such as density, oxygen content and hardness. A well-defined lamellae structure was formed in the as-sprayed deposit by spreading of completely molten droplets, with incorporating small amounts of unmelted/partially-melted particles. Plasma sprayed tungsten deposit had 84-87% theoretical density and 0.2-0.3 wt.% oxygen content. Subsequent sintering at 2500°C promoted the formation of equiaxed grain structure and the production of dense preform up to 98% theoretical density.
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