Directional migration behavior of cerium during sintering process of mischmetal doped cemented carbide
作者： Li Zhang , Shu Chen , Xiang-jun Xiong , Xian-wang Yu , Yuan-jie Wang
DOI: 10.1007/S11771-008-0002-2
关键词:
摘要: Three observation methods were used to investigate the existing form and behavior of rare earth during sintering process high activity mischmetal (RE, with lanthanum cerium) doped WC-8%Co-0.048%RE(mass fraction) alloy low carbon-containing level by scanning electron microscopy (SEM) energy dispersive X-ray spectroscopy (EDXS), considering fact that addition amount in is very minute. The directional migration mechanism cerium discussed. First, sinter skin (surface) observed. It shown there exists a dispersedly distributed containing oxide on skin, these enrichment positions Secondly, polished section observed, phase/micro-zone identified. Finally, based fracture cemented carbide resulted from heterogeneous phase or other defects within microstructure, surface observed source approximately 260 μm These combined observations reveal adequately get separated predominantly migrates towards process.
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