EN ISO 20509:2023

SLOVENSKI STANDARD
01-maj-2023
Fina keramika (sodobna keramika, sodobna tehnična keramika) - Ugotavljanje
oksidacijske odpornosti neoksidne monolitne keramike (ISO 20509:2003)
Fine ceramics (advanced ceramics, advanced technical ceramics) - Determination of
oxidation resistance of non-oxide monolithic ceramics (ISO 20509:2003)
Hochleistungskeramik - Bestimmung der Beständigkeit von nichtoxidischer
monolithischer Keramik gegen Oxidation (ISO 20509:2003)
Céramiques techniques - Détermination de la résistance à l'oxydation des céramiques
monolithiques (ISO 20509:2003)
Ta slovenski standard je istoveten z: EN ISO 20509:2023
ICS:
81.060.30 Sodobna keramika Advanced ceramics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20509
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2023
EUROPÄISCHE NORM
ICS 81.060.30
English Version
Fine ceramics (advanced ceramics, advanced technical
ceramics) - Determination of oxidation resistance of non-
oxide monolithic ceramics (ISO 20509:2003)
Céramiques techniques - Détermination de la Hochleistungskeramik - Bestimmung der Beständigkeit
résistance à l'oxydation des céramiques monolithiques von nichtoxidischer monolithischer Keramik gegen
(ISO 20509:2003) Oxidation (ISO 20509:2003)
This European Standard was approved by CEN on 10 March 2023.

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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20509:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 20509:2003 has been prepared by Technical Committee ISO/TC 206 "Fine ceramics” of
the International Organization for Standardization (ISO) and has been taken over as EN ISO 20509:2023
by Technical Committee CEN/TC 184 “Advanced technical ceramics” the secretariat of which is held by
DIN.
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 September 2023, and conflicting national standards
shall be withdrawn at the latest by September 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 20509:2003 has been approved by CEN as EN ISO 20509:2023 without any modification.

INTERNATIONAL ISO
STANDARD 20509
First edition
2003-12-01
Fine ceramics (advanced ceramics,
advanced technical ceramics) —
Determination of oxidation resistance of
non-oxide monolithic ceramics
Céramiques techniques — Détermination de la résistance à l'oxydation
des céramiques monolithiques
Reference number
ISO 20509:2003(E)
©
ISO 2003
ISO 20509:2003(E)
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©
ii ISO 2003 – All rights reserved

ISO 20509:2003(E)
Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 2
5 Test pieces . 3
6 Test procedure . 3
7 Calculations . 5
8 Test report . 7
Annex A (informative) Useful information . 8
Annex B (informative) Interlaboratory evaluation of the test method . 9
Bibliography . 11
©
ISO 2003 – All rights reserved iii

ISO 20509:2003(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 20509 was prepared by Technical Committee ISO/TC 206, Fine ceramics.
©
iv ISO 2003 – All rights reserved

INTERNATIONAL STANDARD ISO 20509:2003(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Determination of oxidation resistance of non-oxide
monolithic ceramics
1Scope
This International Standard describes the method of test for determining the oxidation resistance of non-oxide
1)
monolithic ceramics, such as silicon nitride, Sialon and silicon carbide at high temperatures. This International
Standard is intended to provide an assessment of the mass and dimensional changes of test pieces following
oxidation at high temperature in an oxidizing atmosphere, and to assess whether oxidation has a significant
effect on the subsequent strength. This test method may be used for materials development, quality control,
characterization, and design data generation purposes.
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.
ISO 3611:1978, Micrometer callipers for external measurement
ISO 6906:1984, Vernier callipers reading to 0,02 mm
2)
ISO 7500-1:— , Metallic materials — Verification of static uniaxial testing machines — Part1:
Tension/compression testing machines — Verification and calibration of the force-measuring system
ISO 14704:2000, Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for flexural
strength of monolithic ceramics at room temperature
IEC 60584-1:1995, Thermocouples — Part 1: Reference tables
IEC 60584-2:1989, Thermocouples — Part 2: Tolerances
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
oxidation resistance
resistance against oxidation of a non-oxide ceramic material due to reaction with oxygen in the surrounding
atmosphere, including any internal reactions as a result of the presence of open porosity or of diffusion of ions
to or from the ceramic surface
3.2
flexural strength
maximum nominal stress at fracture of a specified elastic beam loaded in bending
1) Sometimes written SiAlON is the acronym for a ceramic that contains silicon, aluminium, oxygen and nitrogen.
2) To be published. (Revision of ISO 7500-1:1999)
©
ISO 2003 – All rights reserved 1

ISO 20509:2003(E)
4 Apparatus
4.1 High temperature furnace, e.g. any suitable air atmosphere furnace with a nominal temperature
◦
capability of at least 1 500 C.
The furnace chamber shall have an inlet for a sufficient supply of oxidation gas to ensure that the atmosphere
does not stagnate and become oxygen deficient. The temperature shall be capable of being raised to that
◦ −1 ◦
required for testing at a minimum of 5 C min , of being controlled to better than ± 5 C at all oxidation
◦ −1 ◦
temperatures, and of being cooled at more than 5 C min to below 800 C. Before commencing oxidation
tests, the furnace chamber shall be baked out using the same atmosphere as proposed for testing and at a
temperature at least as high as the intended oxidation test temperature for a period of at least 10 h in order to
remove contaminants.
4.2 Support or supporting stand, for oxidation tests.
The test pieces shall be supported using techniques that minimize contact area, degree of adhesion and extent
of reaction with the test piece (see Figure 1). Preferably this should be done using point or line contact only. Any
contact of the supports with the regions of the test piece surfaces to be subjected later to loading roller contact
in flexural strength testing shall be avoided. Examples of suitable support methods include the use of a block
with drilled holes no more than 3mm deep such that the test pieces can stand near vertically with a minimum of
end and edge contact. The samples can also be situated on horizontal supports on rollers of silicon carbide or
mullite, on small diameter platinum wires, either suspended or resting on a clean non-reactive ceramic surface,
or on semi-rings which can be cut from ceramic tubes (alumina, mullite, silicon carbide, or silicon nitride).
a) b) c) d)
a) a refractory block with appropriate-sized holes in it, suitable for muffle furnace;
b) a support system based on tubes and discs with holes, suitable for vertical tube furnace;
c) a pair of supported parallel rods spaced near the ends of the test-pieces and with an adequate gap underneath,
suitable for a muffle furnace;
d) a test-piece supported by
...