نوع مقاله : مقاله پژوهشی
نویسندگان
دانشکده مهندسی مواد، دانشگاه صنعتی مالک اشتر، اصفهان، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Introduction and Objective: The aim of this research is to investigate the effect of secondary tungsten powder reduction on the physical and mechanical properties of tungsten heavy alloys (WHAs) consolidated by the spark plasma sintering (SPS) method.
Materials and Methods: Commercial tungsten powder was reduced at 900 °C for one hour in a hydrogen atmosphere. The type of tungsten oxide was investigated using SEM, EDS, Raman spectroscopy, and XRD analysis. The reduced tungsten powders were pre-sintered in a hydrogen atmosphere at 1150 °C for one hour and finally sintered at 1400 °C using the SPS method (30 MPa, 15 min).
Results: The oxygen level of the commercial powder was successfully reduced from 3000 ppm to 770 ppm. SEM and EDS results revealed a uniform microstructure with minimal porosity and oxide dispersion. The hardness and compressive strength were measured to be 340 Vickers and 1611 MPa, respectively.
Conclusion: This study confirms that secondary hydrogen reduction of commercial tungsten powder effectively decreases oxygen content and leads to a more homogeneous microstructure with reduced porosity and oxide dispersion. As a result, the spark plasma sintered WHAs exhibited improved hardness and compressive strength.
کلیدواژهها [English]
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