CHARACTERIZATION OF ENTRAPPED GASES IN RAPIDLY SOLIDIFIED POWDERS

被引：78

作者：

RABIN, BH

SMOLIK, GR

KORTH, GE

机构：

[1] Idaho National Engineering Laboratory, EG and G Idaho Inc., Idaho Falls, ID 83415-2218

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1990年 / 124卷 / 01期

关键词：

D O I：

10.1016/0921-5093(90)90328-Z

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Analysis of a variety of rapidly solidified powders produced in inert gas environments revealed that the powders contain inert gas levels on the order of several atomic parts per million. Characterization of a centrifugally atomized type 304 stainless steel powder showed that the gas concentration and porosity increased with increasing particle size owing to the presence of gas bubbles within the powder particles. A mechanism for gas bubble entrapment during liquid droplet formation and solidification is suggested. Calculations based upon a spherical liquid droplet containing a gas bubble indicate that most of the observed gas can be accounted for by the macroscopic gas porosity; however, it is not possible to rule out that a small fraction of the gas may be present in submicroscopic form. © 1990.

引用

页码：1 / 7

页数：7

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