Landolt-Börnstein - Group VIII Advanced Materials and Technologies

Uniaxial compaction in rigid dies

Abstract

This chapter discusses forming techniques. The way of forming depends mostly on whether the powder develops green strength under compressive stresses. Powders with green strength after compaction do not need external support for further handling, but powders without green strength must be filled in containers for consolidation or in some cases can be kept in shape by binders. Of all powder metallurgical forming techniques, die compaction is by far the most economical and important method. It is described in detail along with illustrations of various die compaction techniques. The powders for die compaction can be irregular, to provide for mechanical interlocking of adjacent particles on compaction, or they can contain soft organic binders in large percentages that bond the particles together. The classical process for die compaction with consolidation is axial hot pressing. The heat resistant die and punches are e.g. placed in a suitable type of furnace and heated by convection and radiation while the powder is kept under constant pressure. Instead of indirect heating in coils or tube furnaces, the power can also be supplied directly via the punches or the dies, or the whole assembly may be heated by induction. The basic principle of powder forging, which is more a production sequence than a single operation, is outlined.

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Title
Uniaxial compaction in rigid dies
Book Title
Powder Metallurgy Data
In
3 Forming
Book DOI
10.1007/b88278
Chapter DOI
10.1007/10689123_7
Part of
Landolt-Börnstein - Group VIII Advanced Materials and Technologies
Volume
2A1
Editors
  • P. Beiss Send Email (11)
  • R. Ruthardt Send Email (12)
  • H. Warlimont Send Email (13)
  • Editor Affiliation
  • 11 Professur und Institut für Werkstoffkunde, Rheinisch Westfälische Technische Hochschule (RWTH) Aachen, 52062, Aachen, Germany
  • 12 Aussenstelle Hanau, Deutsche Gesellschaft für Materialkunde e.V., Adalbert-Stifter-Str. 19, 63452, Hanau, Germany
  • 13 Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, 01069, Dresden, Germany
  • Authors
  • P. Beiss Send Email (101)
  • Author Affiliation
  • 101 Professur und Institut für Werkstoffkunde, Rheinisch Westfälische Technische Hochschule (RWTH) Aachen, 52062, Aachen, Germany
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