1、April 2015Translation by DIN-Sprachendienst.English price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 2
2、5.220.20!%A“2309494www.din.deDDIN EN ISO 14920Thermal spraying Spraying and fusing of self-fluxing alloys (ISO 14920:2015);English version EN ISO 14920:2015,English translation of DIN EN ISO 14920:2015-04Thermisches Spritzen Spritzen und Einschmelzen von selbstflieenden Legierungen (ISO 14920:2015);
3、Englische Fassung EN ISO 14920:2015,Englische bersetzung von DIN EN ISO 14920:2015-04Projection thermique Projection et fusion dalliages autofondants (ISO 14920:2015);Version anglaise EN ISO 14920:2015,Traduction anglaise de DIN EN ISO 14920:2015-04SupersedesDIN EN ISO 14920:1999-03www.beuth.deIn ca
4、se of doubt, the German-language original shall be considered authoritative.Document comprises 14 pages03.15 DIN EN ISO 14920:2015-04 A comma is used as the decimal marker. National foreword This document (EN ISO 14920:2015) has been prepared by Technical Committee CEN/TC 240 “Thermal spraying and t
5、hermally sprayed coatings” (Secretariat: DIN, Germany) in collaboration with Technical Committee ISO/TC 107 “Metallic and other inorganic coatings”. The responsible German body involved in its preparation was the DIN-Normenausschuss Schweien und verwandte Verfahren (DIN Standards Committee Welding a
6、nd Allied Processes), Working Committee NA 092-00-14 AA Thermisches Spritzen und thermisch gespritzte Schichten (DVS AG V 7). The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 6508-1 DIN EN ISO 6508-1 ISO 11124-1 DIN EN ISO 11124-1 ISO 11
7、126-1 DIN EN ISO 11126-1 ISO 14924 DIN EN ISO 14924 Amendments This standard differs from DIN EN ISO 14920:1999-03 as follows: a) Clause 2 “Normative references” has been updated; b) reference to DIN EN ISO 14924, Post-treatment and finishing of thermally sprayed coatings has been included; c) Table
8、 A.1 “Reference values for the expected hardness of the fused coating” in Annex A has been revised; d) Clause 8 “Hardness testing” (former Subclause 7.5) has been completely revised and the size of the test area has been changed; e) a Bibliography has been added. Previous editions DIN EN ISO 14920:
9、1999-03 National Annex NA (informative) Bibliography DIN EN ISO 6508-1, Metallic materials Rockwell hardness test Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) DIN EN ISO 11124-1, Preparation of steel substrates before application of paints and related products Specifications for meta
10、llic blast-cleaning abrasives Part 1: General introduction and classification DIN EN ISO 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 classification DIN EN ISO 1492
11、4, Thermal spraying Post-treatment and finishing of thermally sprayed coatings 2EN ISO 14920January 2015 ICS 25.220.20 Supersedes EN ISO 14920:1999English Version Thermal spraying - Spraying and fusing of self-fluxing alloys (ISO 14920:2015) Projection thermique - Projection et fusion dalliages auto
12、fondants (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 comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givi
13、ng 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 offi
14、cial 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
15、 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, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
16、Sweden, Switzerland, Turkey andUnited Kingdom. CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14920:2015 EEUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPE
17、N DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMContentsPage Foreword . 3 Introduction . 4 1 Scope . 5 2 Normative references. 5 3 Influence on the substrate and design 5 3.1 Substrate metal 5 3.2 Design . 5 4 Spray material of the self-fluxing alloy 6
18、4.1 Selection . 6 4.2 Composition . 6 5 Preparation of the component 6 5.1 General 6 5.2 Methods of surface preparation . 7 5.3 Cleanliness . 7 6 Spray and fusion process . 7 6.1 Spraying with simultaneous fusion 7 6.1.1 Procedure 7 6.1.2 Particle size and particle size range of the powder particles
19、 7 6.1.3 Coating thickness 7 6.2 Spraying with subsequent fusion . 8 6.2.1 Procedure 8 6.2.2 Particle size and particle size range of the powder particles 8 6.2.3 Coating thickness 8 6.3 Spraying technique Procedure 8 6.3.1 General 8 6.3.2 Preheating . 8 6.3.3 Spraying 8 6.3.4 Fusing the deposit . 9
20、 6.3.5 Cooling 9 7 Final machining 9 8 Hardness testing 9 8.1 General 9 8.2 Standard hardness test . 10 Annex A (informative) Reference values for the expected hardness of the fused coating 11 Bibliography 12 DIN EN ISO 14920:2015-04 EN ISO 14920:2015 (E) 2ForewordThis document (EN ISO 14920:2015) h
21、as 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 st
22、andard, either by publication of an identical text or by endorsement, at the 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. CE
23、N and/or CENELEC shall not be held responsible for identifying any or all such 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:
24、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, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, S
25、weden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 14920:2015 has been approved by CEN as EN ISO 14920:2015 without any modification. “ ”DIN EN ISO 14920:2015-04EN ISO 14920:2015 (E)3IntroductionRequests for official interpretations of any aspect of this standard s
26、hould be directed 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.DIN EN ISO 14920:2015-04 EN ISO 14920:2015 (E) 41 ScopeThis International standard defines the procedure for thermal spraying of self-fluxing alloys that are
27、 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 application. For dated references, only the edition cited applies. For
28、 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-cleaning abrasives Part 1: General introduction and classificationISO
29、 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 Recommendations for thermal sprayingISO 14924, Thermal spraying Post-treatme
30、nt 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 Influence on the substrate and design3.1 Substrate metalDue to the heat
31、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 stress relieve;c) an irreversible transformation of the mechanical
32、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 substrate metal liable to stress cracking.3.2 DesignThe preparation of
33、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, as the coating does not contribute to the strength of the component.
34、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 can be affected by the application of the coating.DIN EN ISO 14920:20
35、15-04EN ISO 14920:2015 (E)5Due to the heat input during fusing unacceptable deformation of the component may occur. Measures to prevent distortion or deformation can be used, 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 t
36、he 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) resistance to wear and/or corrosion;c) machinability;d) suitability for the foreseen application.4.2 CompositionThe chemical com
37、position of the spray material and the structure of the coating determine its metallurgical and technological properties as well as its machinability.For substrate alloys, which can create a martensitic structure, see 6.3.5.Table A.1, contains reference values for the expected hardness of the fused
38、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. Particular attention shall be paid to porous components, because oil and grease can exude out of the pores during the preheating or co
39、ating 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 be 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
40、 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 edge of the component, the depression shall be machined to provide an angle of 30 to 40 at each end, blending smoothly with the a
41、djoining 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 coating shall finish to a square edge, the component shall be left longer than the proposed finished overall size and the excess shal
42、l be machined off after finishing the coating process.DIN EN ISO 14920:2015-04 EN ISO 14920:2015 (E) 65.2 Methods of surface preparation5.2.1 Surface preparation shall be carried out according to EN 13507.The surface to be coated should be grit blasted using suitable angular grit according to ISO 11
43、124-1 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 shall 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
44、. 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 prevent the adherence of spray particles, shall be able to withstand the preheating and spray particle temperatures.5.2.4 Drilled holes and other ori
45、fices, 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 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 p
46、ieces of carbon suitably shaped to prevent ingress of the coating material. They shall protrude with their top surface to be caught for subsequent machining.5.3 CleanlinessAfter preparation the surface to be coated shall not be contaminated with oil, grease, water or fingerprints. In the case of con
47、tamination the surface shall be completely re-prepared.6 Spray and fusion process6.1 Spraying with simultaneous fusion6.1.1 ProcedureThis operation of 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
48、 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.
49、2 Particle size and particle size range of the powder particlesThe suitable grain size and the particle size range depend on the design of the powder feed system. In order to avoid powder feed restrictions and blockages the powder size range recommended by the torch supplier shall be used.6.1.3 Coating thicknessA limitation on deposit thickness is dependent on the chosen alloy, the required coating quality, and the acceptable residual stresses, which will i
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