Evolution of reduction process from tungsten oxide to ultrafine tungsten powder via hydrogen
Yue Wang, Ben Fu Long, Chun Yu Liu, Gao Lin
Abstract
Abstract Herein, the evolution of reduction process of ultrafine tungsten powder in industrial conditions was investigated. The transition process of morphology and composition was examined via SEM, XRD, and calcination experiments. The results show that the reduction sequence of WO 2.9 was WO 2.9 → WO 2.72 → WO 2 → W on the surface, but WO 2.9 → WO 2 → W inside the oxide particles. With the aid of chemical vapor transport of WO x (OH) y , surface morphology transformed into rod-like, star-shaped cracking, floret, irregularly fibrous structure, and finally, spherical tungsten particles.
Topics & Concepts
Materials scienceCalcinationTungstenMorphology (biology)OxideChemical engineeringTungsten oxideHydrogenMetallurgyCatalysisGeneticsChemistryBiologyEngineeringOrganic chemistryBiochemistryAdvanced materials and compositesAdvanced ceramic materials synthesisMetal Extraction and Bioleaching