EN 15520:2024
(Main)Thermal spraying - Recommendations for constructional design of components with thermally sprayed coatings
Thermal spraying - Recommendations for constructional design of components with thermally sprayed coatings
This document is applicable for thermal sprayed coatings. It contains basic recommendations for the design of components, which have to be completely or partially coated. The recommendations are applicable for new manufacturing as well as for repair of worn components. The coating can be of metallic, metal-ceramic, oxide-ceramic materials or polymers.
Thermisches Spritzen - Empfehlungen zum konstruktiven Gestalten von Bauteilen mit thermisch gespritzten Schichten
Dieses Dokument ist für thermisch gespritzte Schichten anwendbar. Es enthält grundsätzliche Empfehlungen zur Gestaltung von Bauteilen, die komplett oder teilweise beschichtet werden müssen. Die Empfehlungen sind sowohl für die Neufertigung als auch für die Instandsetzung von verschlissenen Bauteilen anwendbar. Die Beschichtung kann aus metallischen, metallkeramischen, oxidkeramischen Werkstoffen oder aus Kunststoff bestehen.
Projection thermique - Recommandations relatives à la conception des éléments de construction comportant un revêtement déposé par projection thermique
Le présent document s’applique aux revêtements déposés par projection thermique. Il comprend des recommandations générales sur la conception des éléments qui doivent être revêtus, que ce soit en totalité ou en partie. Ces recommandations s’appliquent à la fabrication d’éléments neufs mais aussi à la réparation d’éléments usés. Le revêtement peut être en métal, en cermet, en oxyde-céramique ou en polymères.
Vroče brizganje - Priporočila za konstrukcijsko oblikovanje komponent s prevlekami, nanesenimi z vročim brizganjem
Ta evropski standard se uporablja za prevleke, nanesene z vročim brizganjem. Vsebuje osnovna priporočila za oblikovanje komponent, ki morajo biti v celoti ali delno prevlečene. Priporočila se uporabljajo tako za novo izdelavo kot tudi za popravilo obrabljenih komponent. Prevleka je lahko izdelana iz kovinskih, kovinsko-keramičnih ali oksidno keramičnih materialov ali polimerov.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2024
Nadomešča:
SIST EN 15520:2007
Vroče brizganje - Priporočila za konstrukcijsko oblikovanje komponent s
prevlekami, nanesenimi z vročim brizganjem
Thermal spraying - Recommendations for constructional design of components with
thermally sprayed coatings
Thermisches Spritzen - Empfehlungen zum konstruktiven Gestalten von Bauteilen mit
thermisch gespritzten Schichten
Projection thermique - Recommandations relatives à la conception des éléments de
construction comportant un revêtement déposé par projection thermique
Ta slovenski standard je istoveten z: EN 15520:2024
ICS:
25.220.20 Površinska obdelava Surface treatment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 15520
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2024
EUROPÄISCHE NORM
ICS 25.220.20 Supersedes EN 15520:2007
English Version
Thermal spraying - Recommendations for constructional
design of components with thermally sprayed coatings
Projection thermique - Recommandations relatives à la Thermisches Spritzen - Empfehlungen zum
conception des éléments de construction comportant konstruktiven Gestalten von Bauteilen mit thermisch
un revêtement déposé par projection thermique gespritzten Schichten
This European Standard was approved by CEN on 17 June 2024.
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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15520:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Applications and specific properties of thermally sprayed coatings . 5
5 Basic rules for design of components with thermal sprayed coatings . 6
6 Design for preparation of components and work pieces for thermal spraying . 7
7 Machining and post-treatment of thermal sprayed coatings . 8
8 Instructions for design - Symbolic representation of the sprayed coating on drawings
- Test instructions in the parts list . 8
9 Examples for design suitable for spraying . 8
9.1 Plane surfaces . 8
9.2 Rotationally symmetrical parts . 8
9.3 Special shape . 9
Bibliography . 17
European foreword
This document (EN 15520:2024) has been prepared by Technical Committee CEN/TC 240 “Thermal
spraying and thermally sprayed coatings”, 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 January 2025, and conflicting national standards shall
be withdrawn at the latest by January 2025 month year of DOW.
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.
This document supersedes EN 15520:2007.
— normative references and bibliography updated;
— document editorially revised;
— Figures 2, 3 and 7 (now 8) revised and improved;
— new Figure 7 (Examples for technology to avoid sharp edges at coating run-out) added.
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 organisations 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.
Introduction
Thermal spraying is applied to improve the surface properties of work pieces in order to increase the
wear resistance, the electrical conductivity or the electrical resistance, to achieve corrosion resistance for
the pertinent service conditions, to improve sliding behaviour or, to provide heat insulation.
Recommendations for thermal spraying are contained in EN ISO 12679.
1 Scope
This document is applicable for thermal sprayed coatings. It contains basic recommendations for the
design of components, which have to be completely or partially coated. The recommendations are
applicable for new manufacturing as well as for repair of worn components. The coating can be of
metallic, metal-ceramic, oxide-ceramic materials or polymers.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 12671, Thermal spraying — Thermally sprayed coatings — Symbolic representation on drawings
(ISO 12671)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
4 Applications and specific properties of thermally sprayed coatings
Due to their structure, thermal sprayed coatings possess properties which markedly distinguish them
from bulk materials. An appropriate basic structural design and a suitable parent metal have to bear any
mechanical loading. Usually, thermal sprayed coatings do not increase the strength of the parent work
piece.
Some process related features and specific properties of thermal sprayed coatings are summarized in
Table 1.
Table 1 — Process related features and specific properties of thermal sprayed coatings
Process related features Specific properties of thermal sprayed coating
Components made of almost every material can Not every spraying procedure is appropriate for all
be coated by thermal spraying. applications.
Coatings with properties completely different
—
from the parent material are possible.
Coatings can be sprayed with different spraying Usually the effect of the residual stress in the
materials side by side, one upon another, or coating rises with increasing coating thickness.
mixing into one another (graded coatings).
Usually the heat input caused by spraying is so If the coating is not post heat treated the bond
low, that it is possible to avoid structural strength mainly depends on mechanical adhesive
transformation or deformation. properties. If the coating is post heat treated the
bond strength depends on diffusion and the
The heat input by fusing self-fluxing alloys or
coating is densified.
diffusion annealing can cause structural
transformation or deformation.
The ability to apply the spraying process is Some geometric dimensions e.g. internal bores
practically independent of the size of the with too small a diameter can limit the spray
component. ability.
Components with complicated shapes can be Sprayed coatings are susceptible to edge loading,
coated, if appropriate spraying equipment is point and line loading and impact stresses.
used.
Areas of a component, which shall be free of
sprayed material can be protected, e.g. by —
masking.
The untreated surface of the coating provides a
—
good basis for painting or sealing.
Several thermal spraying processes can be
—
applied on site as well as in a workshop.
Coating properties e.g. porosity can be varied to Sprayed coatings are micro porous except for post
suit particular applications. heat treated self-fluxing alloy coatings.
5 Basic rules for design of components with thermal sprayed coatings
Without proper consideration of the constructional design for thermal sprayed coatings, it might not be
possible to achieve the desired properties of the coating.
Designs which are suitable for thermal spraying will be suitable for pre-treatment, blasting and visual
inspection.
Further design instructions for specific applications are contained in EN ISO 14921 and EN ISO 17834
and for the protection of steel structures against corrosion in EN ISO 12944-3, EN ISO 14713-1 and
EN ISO 2063-1 and EN ISO 2063-2. These standards deal with the evaluation of coating material,
processing and testing and give recommendations for coating thicknesses for several corrosive
conditions.
The most important rules for the design are summarized in Table 2.
Table 2 — Basic rules and arguments
Basic rules Arguments — Explanations
Sufficient accessibility of the area to be coated. The procedure, spray gun with its electrical
and/or gas connections, required spray
distance and spray angle shall all be
considered.
Area to be coated shall be visible and Visible and within reach for the spray jet or tool
attainable. moved by an operator or a manipulator.
Sharp edges are to be avoided. Usually they cannot be coated, with a sufficient
and uniform coating thickness. Coatings can be
damaged on sharp edges. Sharp edges on holes
and along cut edges shall be chamfered or
rounded.
Small internal radii are to be avoided. Turbulence of the spray jet, unfavourable
angles of incidence, and irregular rebounding
spray particles will occur which will lead to
insufficient bond strength and density.
Sprayed coatings in narrow holes, slots or in Turbulence and spray particles which are
blind holes are to be avoided. insufficiently adherent to the wall can occur.
Dust inclusions when coating internal surfaces Special care to remove dust and heat.
shall be minimized, see Figure 4.
The spray jet should hit the surface at right- Insufficient spray angles impair bond strength,
angles. The angle of incidence shall not be less efficiency, and coating structure. See
than 45°. Figures 4a) and 4b).
The risk of spalling of the coating has to be The coating shall be continued around rounded
minimized. or chamfered edges. See Figures 5a) and 5b).
The risk of damaging the coating has to be A support edge or pocket (e.g. per Figure 9
minimized. detail X) may be employed.
Welds to be coated shall be free of splatters, Smoothing of such irregularities shall be
undercuts and pores. required.
Heat affected zone from thermally cut edges Remove the hardened sharp edge of the cut.
has to be minimized.
6 Design for preparation of components and work pieces for thermal spraying
When components or work pieces shall be only partially coated, the final machining to finished size of
the whole component shall be carried out after spraying the coating. When manufacturing rotationally
symmetrical components the blank should be pre-machined only in the area to be sprayed to the diameter
appropriate for the coating thickness. One example is shown in Figure 8.
In case of thermal spraying of finish-machined parts or repair of parts by coating, areas which shall not
be coated may be protected by appropriate measures (e.g. masking) for blasting and thermal spraying.
7 Machining and post-treatment of thermal sprayed coatings
The different propert
...
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