SIST EN ISO 14921:2002
(Main)Thermal spraying - Procedures for the application of thermally sprayed coatings for engineering components (ISO 14921:2001)
Thermal spraying - Procedures for the application of thermally sprayed coatings for engineering components (ISO 14921:2001)
This standard relates to the general procedures of application of thermally sprayed coatings as defined in EN 657.
The purpose of these coatings being either to reclaim worn and non conforming parts or to enhance the surface
properties of components for specific purposes.
For example, to provide wear resistance, low coefficient of friction, electrical or thermal conductivity or insulation,
and resistance to corrosion.
This standard is not intended to provide definitive methods for specific work and attention shall be paid to the proper
selection of process and materials for the purpose and to the skills of the thermal sprayer as defined in
EN ISO 14918.
Additionally it does not include requirements for the protection of structural steelwork, covered by EN 22063, nor the
use of coatings of self fluxing alloys which are subsequently fused, covered by EN ISO 14920.
Thermisches Spritzen - Vorgehen für das Anwenden thermischer Spritzschichten für Bauteile im Maschinenbau (ISO 14921:2001)
Diese Norm bezieht sich auf die in EN 657 definierten Verfahren zum Aufbringen thermischer Spritzschichten. Diese Schichten dienen entweder der Reparatur verschlissener und nicht passender Teile oder der Verbesserung der Oberflächeneigenschaften von Bauteilen für bestimmte Zwecke. Zum Beispiel können dadurch Verschleißbeständigkeit, Verringerung des Reibungskoeffizienten, der elektrischen oder thermischen Leitfähigkeit oder Isolation sowie Korrosionsbeständigkeit erzielt werden.
Projection thermique - Procédure d'application de revetements obtenus par projection thermique pour les pieces mécaniques (ISO 14921:2001)
La présente Norme traite des méthodes générales d'application des couches projetées thermiquement telles que définies dans l'EN 657. Ces revetements permettent, soit de récupérer des pieces usées et non conformes, soit d'améliorer les propriétés de la surface de pieces destinées a des applications spécifiques.
Sont, par exemple, concernées les caractéristiques suivantes : résistance a l'usure, faible coefficient de frottement, isolation ou conductivité électrique ou thermique, et résistance a la corrosion.
La présente Norme ne vise pas a fournir des méthodes reconnues pour une piece a traiter spécifique et il faut veiller d'une part, a choisir convenablement le procédé et les matériaux en fonction de l'application voulue, et d'autre part, a faire appel aux personnels ayant les compétences nécessaires en matiere de projection thermique, telles que définies dans l'EN ISO 14918.
Elle ne comprend pas aucune exigence sur la protection des structures en acier qui relevent de l'EN 22063 ou sur l'utilisation des revetements en alliages auto-fondants qui sont fondus a une étape ultérieure, relevant de l'EN ISO 14920.
Vroče brizganje - Postopki nanašanja vroče brizganih prevlek na strojne dele (ISO 14921:2001)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 14921:2002
01-marec-2002
9URþHEUL]JDQMH3RVWRSNLQDQDãDQMDYURþHEUL]JDQLKSUHYOHNQDVWURMQHGHOH ,62
Thermal spraying - Procedures for the application of thermally sprayed coatings for
engineering components (ISO 14921:2001)
Thermisches Spritzen - Vorgehen für das Anwenden thermischer Spritzschichten für
Bauteile im Maschinenbau (ISO 14921:2001)
Projection thermique - Procédure d'application de revetements obtenus par projection
thermique pour les pieces mécaniques (ISO 14921:2001)
Ta slovenski standard je istoveten z: EN ISO 14921:2001
ICS:
25.220.20 Površinska obdelava Surface treatment
SIST EN ISO 14921:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 14921:2002
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SIST EN ISO 14921:2002
EUROPEAN STANDARD
EN ISO 14921
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2001
ICS 25.220.20
English version
Thermal spraying - Procedures for the application of thermally
sprayed coatings for engineering components (ISO 14921:2001)
Projection thermique - Procédure d'application de Thermisches Spritzen - Vorgehen für das Anwenden
revêtements obtenus par projection thermique pour les thermischer Spritzschichten für Bauteile im Maschinenbau
pièces mécaniques (ISO 14921:2001) (ISO 14921:2001)
This European Standard was approved by CEN on 13 May 2001.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14921:2001 E
worldwide for CEN national Members.
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SIST EN ISO 14921:2002
EN ISO 14921:2001 (E)
Contents
.............................................................................. Page
Foreword . 3
1 Scope . 3
2 Normative references . 3
3 Component and coating design considerations . 3
3.1 Pre-inspection . 3
3.2 Component substrates . 4
3.3 Coating . 4
4 Preliminary machining or grinding . 4
5 Masking . 4
6 Methods of surface preparation . 5
7 Spraying . 5
8 Inspection after spraying . 5
9 Sealing . 5
10 Finishing . 5
11 Final inspection . 5
Annex A (informative) Flow chart for assessment of suitability of thermal spraying . 6
Annex B (informative) Check list to assist in determining the most suitable coating system
for the intended purpose . 7
Annex C (informative) Example of thermal spraying procedure specification or record . 8
2
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SIST EN ISO 14921:2002
EN ISO 14921:2001 (E)
Foreword
The text of EN ISO 14921:2001 has been prepared by Technical Committee CEN/TC 240 "Thermal spraying and
thermally sprayed coatings", the secretariat of which is held by DIN, in collaboration with Technical Committee
ISO/TC 107 "Metallic and other inorganic coatings".
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 February 2002, and conflicting national standards shall be withdrawn at the latest
by February 2002.
The annexes A to C are informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,
Switzerland and the United Kingdom.
1 Scope
This standard relates to the general procedures of application of thermally sprayed coatings as defined in EN 657.
The purpose of these coatings being either to reclaim worn and non conforming parts or to enhance the surface
properties of components for specific purposes.
For example, to provide wear resistance, low coefficient of friction, electrical or thermal conductivity or insulation,
and resistance to corrosion.
This standard is not intended to provide definitive methods for specific work and attention shall be paid to the proper
selection of process and materials for the purpose and to the skills of the thermal sprayer as defined in
EN ISO 14918.
Additionally it does not include requirements for the protection of structural steelwork, covered by EN 22063, nor the
use of coatings of self fluxing alloys which are subsequently fused, covered by EN ISO 14920.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the
publication referred to applies (including amendments).
EN 657
Thermal spraying – Terminology, classification
EN 13507
Thermal spraying – Pre-treatment of surfaces of metallic parts and components for thermal spraying
EN ISO 14918
Thermal spraying – Approval testing of thermal sprayers (ISO 14918 : 1998)
EN ISO 14920
Thermal spraying – Spraying and fusing of self-fluxing alloys (ISO 14920 : 1999)
EN 22063
Metallic and other inorganic coatings – Thermal spraying - Zinc, aluminium and their alloys (ISO 2063 : 1991,
modified)
3 Component and coating design considerations
The factors to be considered are illustrated in the flow chart shown in Annex A. If any of the following considerations
cannot be met satisfactorily, thermal spraying cannot be carried out.
3.1 Pre-inspection
Before carrying out any other procedure the component shall be inspected to determine its suitability for spraying.
Attention shall be given to :
– In the case of rotating or reciprocating parts, concentricity shall be checked and, where necessary, corrected.
3
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SIST EN ISO 14921:2002
EN ISO 14921:2001 (E)
– Determine that it is free from cracks or damage which may affect performance. If any serious defects cannot
be removed, spraying cannot be carried out.
– Establish dimensions of the area to be sprayed.
– Establish if there is any evidence of a previous coating.
3.2 Component substrate
To establish whether a thermally sprayed coating is suitable for the intended purpose, consideration should be given
to the following
– Certain substrate materials require special consideration.
– Sprayed coatings do not significantly add to the strength of the part and therefore the effects of any reduction
in the dimensions of the original component should be considered.
– The fatigue strength may be affected by the method of surface preparation and application of certain materials.
– Certain surface hardening processes such as nitriding leave gaseous inclusions which may have a detrimental
effect on the bonding and porosity of the coating.
Where hardened surfaces prevent proper preparation, the limitations of the coating systems which can be
applied, and the properties subsequently derived, shall be considered.
– The surface to be coated shall be accessible for the proper preparation and spraying.
3.3 Coating
The different spraying processes as defined in EN 657 and materials available will result in differences in coating
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