Microhardness as a measure of homogeneity of porous tungsten

被引：23

作者：

Selcuk, C ^{[1
]}

Bentham, R

Morley, N

Wood, JV

机构：

[1] Univ Nottingham, Sch MMMEM, Div Mat, Nottingham NG7 2RD, England

[2] CCLRC, Didcot OX11 0QX, Oxon, England

来源：

MATERIALS LETTERS | 2004年 / 58卷 / 12-13期

关键词：

aerospace materials; electronic materials; characterisation methods; hardness; microstructure; porosity; powder technology; sintering;

D O I：

10.1016/j.matlet.2003.11.031

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An important application of tungsten is as a high current density cathode in porous form. It is used as a dispenser cathode after being impregnated with all electron emissive material. Therefore, porosity distribution in the part is a crucial parameter for its use since a uniform and controlled porosity will lead to a better performance. In this study, microhardness is used in order to determine the uniformity of the pore distribution and homogeneity of the structure. Effects of different pressing techniques oil porosity of porous tungsten have been examined. Considerable attention has been given to die and cold isostatic pressed samples. A comparison has been made between the respective porous structures in view of the microhardness measurements. Optical microscopy and SEM are used to relate the results and porous tungsten structure for a better understanding of the applied method. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：1873 / 1876

页数：4