Thermal Stability of Milled Nanocrystalline Tungsten Powders

机译：研磨纳米晶钨粉的热稳定性

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The development of nanocrystalline and ultrafine-grained bulk materials through powder metallurgy processes has long been constrained by the thermal stability of nanostructures. Many difficulties arise due to the fact that grain growth and densification occur within the same temperature regime. Additionally, the mechanisms supporting densification require some degree of grain coarsening in order to achieve full density. This study outlines the development of a thermally stable nanocrystalline tungsten powder and discusses the influence of grain size stability on the overall densification rate during pressureless sintering in hydrogen atmosphere. Furthermore, the activation energy of sintering is calculated to determine whether the mechanisms of grain growth and densification can be decoupled through the addition of thermal grain stabilizers.

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Butler, B.; Klier, E.; Kelly, M.; Gallagher, M.;
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年度 2011
页码 1-24
总页数 24
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Powder metallurgy ; Nanostructures ; Thermal stability ; Sintering ; Grain growth ; Grain size ; Tungsten ; Powders;

机译：粉末冶金;纳米结构;热稳定性;烧结;晶粒生长;晶粒尺寸;钨;粉末;

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Thermal Stability of Milled Nanocrystalline Tungsten Powders

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