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초음파 분무 열분해와 가압소결로 제조한 이트리아 분산입자 강화 텅스텐의 특성
이의선,허연지,김지영,이영인,석명진,오승탁 대한금속·재료학회 2023 대한금속·재료학회지 Vol.61 No.3
The effects of fabrication method on the microstructure and sinterability of W-1 wt% Y2O3 wereanalyzed. W composite powders dispersed with Y2O3 particles were synthesized by the ultrasonic spraypyrolysis process or the ultrasonic spray pyrolysis/polymer solution process. A dense composite was fabricatedby a combination of spark plasma sintering and final hot isostatic pressing. The powder synthesized by theultrasonic spray pyrolysis had fine dispersed particles on the surface of the cubic powder and was composedof W, Y2O3 and W-oxides. On the other hand, in the case of the ultrasonic spray pyrolysis/polymer solutionprocess, the nano-sized particles formed agglomerates and existed only as pure W and Y2O3 phases. All thesintered compacts treated with HIP showed an increase in relative density, and the sintered compacts of thepowder synthesized by the ultrasonic spray pyrolysis/polymer solution process showed a maximum relativedensity of 97~99% and a fine grain size. The change in microstructure with different powder processing wasexplained by the presence of W-oxide and the size and distribution of Y2O3 particles. The Vickers hardnessof the sintered compact reached the largest value of about 5 GPa in the powder synthesized by the ultrasonicspray pyrolysis/polymer solution process, which was interpreted to be a result of the relatively high densityand decreased grain size.