EN 725-10:2007

SLOVENSKI STANDARD
01-marec-2008
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Advanced technical ceramics - Methods of test for ceramic powders - Part 10:
Determination of compaction properties
Hochleistungskeramik - Prüfverfahren für keramische Pulver - Teil 10: Bestimmung der
Verdichtungseigenschaften
Céramiques techniques avancées - Méthodes d'essai pour poudres céramiques - Partie
10: Détermination des propriétés de compaction
Ta slovenski standard je istoveten z: EN 725-10:2007
ICS:
81.060.30
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 725-10
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2007
ICS 81.060.30 Supersedes EN 725-10:1997
English Version
Advanced technical ceramics - Methods of test for ceramic
powders - Part 10: Determination of compaction properties
Céramiques techniques avancées - Méthodes d'essai des Hochleistungskeramik - Prüfverfahren für keramische
poudres céramiques - Partie 10: Détermination des Pulver - Teil 10: Bestimmung der
propriétés de compaction Verdichtungseigenschaften
This European Standard was approved by CEN on 11 August 2007.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 725-10:2007: E
worldwide for CEN national Members.

Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Principle.4
4 Symbols .4
5 Apparatus .4
6 Procedure .5
6.1 Drying.5
6.2 Quantity .5
6.3 Cleaning of the die and punches .5
6.4 Powder testing conditions.5
6.5 Lubrication .5
6.6 Compacting pressures.6
6.7 Compacting and ejection .6
7 Expression of results .7
7.1 Calculation.7
7.2 Compaction curve.7
8 Test report .7
Annex A (informative) Repeatability and reproducibility .11
Annex B (informative) Example of presentation of test report .12
B.1 General.12
B.2 Sample description and preparation .12
B.3 Test conditions .12
B.4 Determination of the density of the compacts .13
B.5 Calculation of density .13
Bibliography .14

Foreword
This document (EN 725-10:2007) has been prepared by Technical Committee CEN/TC 184 “Advanced
technical ceramics”, the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by March 2008, and conflicting national standards shall be withdrawn at
the latest by March 2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 725-10:1996.
EN 725 Advanced technical ceramics — Methods of test for ceramic powders was prepared in parts as
follows:
Part 1: Determination of impurities in alumina
Part 2: Determination of impurities in barium titanate
Part 3: Determination of the oxygen content of non-oxides by thermal extraction with a carrier gas
Part 4: Determination of oxygen content in aluminium nitride by XRF analysis
Part 5: Determination of particle size distribution
Part 6: Determination of the specific surface area [withdrawn]
Part 7: Determination of the absolute density [withdrawn]
Part 8: Determination of tapped bulk density
Part 9: Determination of un-tapped bulk density
Part 10: Determination of compaction properties
Part 11: Determination of densification on natural sintering
Part 12: Chemical analysis of zirconia
Parts 6 and 7 of the series were superseded in 2005 by EN ISO 18757 and EN ISO 18753 respectively.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
1 Scope
This Part of EN 725 describes methods for the determination of the compaction behaviour of ungranulated or
granulated ceramic powders, when subjected to uniaxial compressive loading in a rigid die, under specified
conditions.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories (ISO/IEC
17025:2005)
3 Principle
The powder is compacted uniaxially in a rigid die by double-action pressing. Samples of the powder may be
pressed either at a single pressure or at a series of pressures. After ejection from the die, the apparent
geometrical density of the compact is determined.
Where one pressure is used, the density obtained represents the compaction properties of the powder at that
pressure. Where more than one pressure is used, the densities obtained are utilized for drawing the
compaction curve of the powder, which is a plot of its density as a function of the compacting pressure.
4 Symbols
The symbols and associated units used in this part of EN 725 are set out in Table 1.
Table 1 — Symbols and units
Symbol Designation Unit
Apparent geometrical density kg/m
ρ
geom
m Mass of the compact g
Volume of the compact cm
V
If the apparent density is measured at one pressure only, for example 200 MPa, the symbol becomes, e.g.
ρ (200).
geom
5 Apparatus
5.1 Die, which shall be made from hard material (e.g. tungsten carbide). The cylindrical die shall contain
two punches for producing cylindrical compacts and shall be of the floating type or of the type
...