Orientations and tendencies in manufacturing industry of the permanent ceramic magnets using PM technologies | Health & Environmental Research Online (HERO)

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Citation
Tags

HERO ID

1744071

Reference Type

Journal Article

Title

Orientations and tendencies in manufacturing industry of the permanent ceramic magnets using PM technologies

Author(s)

Mangra, M

Year

2003

Is Peer Reviewed?

Journal

Materials Science Forum
ISSN: 0255-5476
EISSN: 1662-9752

Book Title

MATERIALS SCIENCE FORUM

Volume

426-4

Page Numbers

4379-4384

Web of Science Id

WOS:000183626400708

Abstract

The paper includes two parts:

- first part includes the tendencies regarding world level production of the ceramic permanent magnetic materials and magnets;

- in the second part our team experimental results regarding permanent ceramic magnets based on barium ferrite are presented. In the ternary system BaO - FeO - Fe2O3 the W compound (BaFe18O27) has superior magnetic performances comparing with conventional ones: barium and strontium hexaferrite (BaFe12O19, SrFe12O19). There are presented the elaboration routes, by pirometallurgical processes, of the W compound starting with stoechiometric powder mixture BaO x 9Fe(2)O(3), the physical and chemical processes which take place at the heating of the compound and the influence of some factors such as activator materials and O-2 pressure concerning the decreasing of the synthesis temperature and the cooling stability of the Fe2+ ions.

Keywords

ferrites; permanent magnets; sintering; thermal analysis; solid state reaction