1、BSI Standards PublicationBS EN ISO 14920:2015Thermal spraying Sprayingand fusing of self-fluxing alloysBS EN ISO 14920:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO14920:2015. It supersedes BS EN ISO 14920:1999 which is withdrawn.The UK participation
2、in its preparation was entrusted to TechnicalCommittee STI/40, Thermal spraying and thermally sprayed coatings.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. User
3、s are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 79715 6ICS 25.220.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of th
4、eStandards Policy and Strategy Committee on 31 January 2015.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14920 January 2015 ICS 25.220.20 Supersedes EN ISO 14920:1999English Version Thermal spraying - Spraying and fusing of self-fluxin
5、g alloys (ISO 14920:2015) Projection thermique - Projection et fusion dalliages autofondants (ISO 14920:2015) Thermisches Spritzen - Spritzen und Einschmelzen von selbstflieenden Legierungen (ISO 14920:2015) This European Standard was approved by CEN on 18 October 2014. CEN members are bound to comp
6、ly 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
7、 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 sa
8、me status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg
9、, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 20
10、15 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14920:2015 EBS EN ISO 14920:2015EN ISO 14920:2015 (E) 3 Foreword This document (EN ISO 14920:2015) has been prepared by Technical Committee CEN/TC 240 “Thermal spraying and the
11、rmally 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 th
12、e latest by July 2015, and conflicting national standards shall be withdrawn at the latest by July 2015. 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 s
13、uch patent rights. This document supersedes EN ISO 14920:1999. 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, Eston
14、ia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The t
15、ext of ISO 14920:2015 has been approved by CEN as EN ISO 14920:2015 without any modification. BS EN ISO 14920:2015ISO 14920:2015(E)Contents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Influence on the substrate and design . 13.1 Substrate metal . 13.2 Design . 14 Spray material
16、 of the self-fluxing alloy . 24.1 Selection 24.2 Composition 25 Preparation of the component . 25.1 General . 25.2 Methods of surface preparation . 35.3 Cleanliness 36 Spray and fusion process . 36.1 Spraying with simultaneous fusion . 36.1.1 Procedure . 36.1.2 Particle size and particle size range
17、of the powder particles 36.1.3 Coating thickness 36.2 Spraying with subsequent fusion 46.2.1 Procedure . 46.2.2 Particle size and particle size range of the powder particles 46.2.3 Coating thickness 46.3 Spraying technique Procedure . 46.3.1 General 46.3.2 Preheating . 46.3.3 Spraying . 46.3.4 Fusin
18、g the deposit. 56.3.5 Cooling 57 Final machining . 58 Hardness testing . 58.1 General . 58.2 Standard hardness test 6Annex A (informative) Reference values for the expected hardness of the fused coating 7Bibliography 8 ISO 2015 All rights reserved iiiBS EN ISO 14920:2015ISO 14920:2015(E)ForewordISO
19、(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 comm
20、ittee 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 electrote
21、chnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafte
22、d in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention 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. Det
23、ails of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny trade name used in this document is information given for the convenience of users and does not constitute an endorse
24、ment.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword - Supplementary informationISO 14920 was prepared
25、 by the European Committee for Standardization (CEN) Technical Committee CEN/TC 240, Thermal spraying and thermally sprayed coatings, in collaboration with Technical Committee ISO/TC 107, Metallic and other inorganic coatings, in accordance with the Agreement on technical cooperation between ISO and
26、 CEN (Vienna Agreement).This second edition cancels and replaces the first edition (ISO 14920:1999), which has been technically revised.iv ISO 2015 All rights reservedBS EN ISO 14920:2015ISO 14920:2015(E)IntroductionRequests for official interpretations of any aspect of this standard should be direc
27、ted to the secretariat of ISO/TC 107/WG 1 via your national standards body, a complete listing which can be found at www.iso.org. ISO 2015 All rights reserved vBS EN ISO 14920:2015BS EN ISO 14920:2015Thermal spraying Spraying and fusing of self-fluxing alloys1 ScopeThis International standard define
28、s the procedure for thermal spraying of self-fluxing alloys that are simultaneously or subsequently fused to create a homogeneous, diffusion bonded coating.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its ap
29、plication. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 11124-1, Preparation of steel substrates before application of paints and related products Specifications for metallic blast-c
30、leaning abrasives Part 1: General introduction and classificationISO 11126-1, Preparation of steel substrates before application of paints and related products Specifications for non-metallic blast-cleaning abrasives Part 1: General introduction and classificationISO 12679, Thermal spraying Recommen
31、dations for thermal sprayingISO 14924, Thermal spraying Post-treatment and finishing of thermally sprayed coatingsEN 1274, Thermal spraying Powders Composition, technical supply conditionsEN 13507, Thermal spraying Pre-treatment of surfaces of metallic parts and components for thermal spraying3 Infl
32、uence on the substrate and design3.1 Substrate metalDue to the heat transfer into the substrate metal when fusing the coating, in order to bond the coating with the substrate metal by diffusion, the possible effects of such heating on the substrate metal shall be considered:a) scaling;b) the need to
33、 stress relieve;c) an irreversible transformation of the mechanical and/or metallurgical properties.Martensitic steels are susceptible to stress cracking and alloys containing significant amounts of C, Al, Ti, Mg, S, sulfides, P, and nitrogen can create porosity in the coating and may render the sub
34、strate metal liable to stress cracking.3.2 DesignThe preparation of the component for spraying and fusing of a coating usually includes a reduction of the design dimensions, if pre-machining is applied. Consideration shall be given to the effect of such a reduction on the loading of the component, a
35、s the coating does not contribute to the strength of the component. Consideration shall be given, to the fact that the sprayed and fused coating will have differing physical properties to the substrate material.The fatigue strength, the deformation resistance, and other properties of the component c
36、an be affected by the application of the coating.INTERNATIONAL STANDARD ISO 14920:2015(E) ISO 2015 All rights reserved 1BS EN ISO 14920:2015ISO 14920:2015(E)Due to the heat input during fusing unacceptable deformation of the component may occur. Measures to prevent distortion or deformation can be u
37、sed, such as, to erect or hang the parts along their centre-of-gravity axis or by the use of supporting jigs.4 Spray material of the self-fluxing alloy4.1 SelectionThe properties of the coating are determined by the selection of the spray material and the spray and fuse procedure, e.g.:a) hardness;b
38、) resistance to wear and/or corrosion;c) machinability;d) suitability for the foreseen application.4.2 CompositionThe chemical composition of the spray material and the structure of the coating determine its metallurgical and technological properties as well as its machinability.For substrate alloys
39、, which can create a martensitic structure, see 6.3.5.Table A.1, contains reference values for the expected hardness of the fused coating.5 Preparation of the component5.1 General5.1.1 All components to be coated shall be free from surface contamination such as oil, grease, rust and other dirt. Part
40、icular attention shall be paid to porous components, because oil and grease can exude out of the pores during the preheating or coating process.5.1.2 Any prior surface treatments, for example nitriding, galvanic or other protective coatings shall be removed before the preparation of the surface to b
41、e coated.5.1.3 If the area to be coated and the bordering areas of the component are to be machined then this preparation shall be suitable for the coating process. Recommendations for suitable designs are given in ISO 12679.Where the coating is required to terminate at a point other than the end or
42、 edge of the component, the depression shall be machined to provide an angle of 30 to 40 at each end, blending smoothly with the adjoining surface. Alternatively, if the coating can be continued around a chamfered and/or rounded edge, the risk of spalling of the coating will be reduced.Where the coa
43、ting shall finish to a square edge, the component shall be left longer than the proposed finished overall size and the excess shall be machined off after finishing the coating process.2 ISO 2015 All rights reservedBS EN ISO 14920:2015ISO 14920:2015(E)5.2 Methods of surface preparation5.2.1 Surface p
44、reparation shall be carried out according to EN 13507.The surface to be coated should be grit blasted using suitable angular grit according to ISO 11124-1 or ISO 11126-1.NOTE The choice of the grit blasting material can influence the bond strength of the coating.5.2.2 The grit blasting operation sha
45、ll be confined to the area to be coated. The adjacent areas shall be masked, so that the surfaces will not be damaged and will not be coated later on. The masking material shall resist the grit blasting and shall not contaminate the prepared surface to be sprayed.5.2.3 Masking material, intended to
46、prevent the adherence of spray particles, shall be able to withstand the preheating and spray particle temperatures.5.2.4 Drilled holes and other orifices, which are required not to be grit blasted and coated, shall be plugged. Plugs of steel or rubber are recommended for this purpose, they shall be
47、 shaped and positioned in such a manner as not to mask any part of the surface to be prepared. After grit blasting the plugs shall be replaced with pieces of carbon suitably shaped to prevent ingress of the coating material. They shall protrude with their top surface to be caught for subsequent mach
48、ining.5.3 CleanlinessAfter preparation the surface to be coated shall not be contaminated with oil, grease, water or fingerprints. In the case of contamination the surface shall be completely re-prepared.6 Spray and fusion process6.1 Spraying with simultaneous fusion6.1.1 ProcedureThis operation of
49、spraying with simultaneous fusion is carried out manually using an oxy/acetylene torch, which is fitted with a hopper for the spray powder.A suitable self-fluxing powder is fed from the hopper into the gas stream and heated by the flame, accelerated and sprayed to the component, where it is simultaneously fused to the substrate metal. Using this continuous process a coating is created, whose properties depend on the self-fluxing powder used.6.1.2 Particle size and particle size range of the powder particlesThe suitable grain size and the
