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1、BRITISH STANDARD BS EN ISO 14921:2001 Thermal spraying Procedures for the application of thermally sprayed coatings for engineering components The European Standard EN ISO 14921:2001 has the status of a British Standard ICS 25.220.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT
2、 LAW Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:35:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 14921:2001 This British Standard, having been prepared under the direction of the Sector Policy and Strategy Committee for Materials and Chemicals, was published under the author
3、ity of the Standards Policy and Strategy Committee on 22 August 2001 BSI 22 August 2001 ISBN 0 580 37964 7 National foreword This British Standard is the official English language version of EN ISO 14921:2001. It is identical with ISO 14921:2001 The UK participation in its preparation was entrusted
4、to Technical Committee STI/40, Thermally sprayed inorganic finishes, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications refer
5、red to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a c
6、ontract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the inte
7、rpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, pages 2 to 8, an inside back cover and
8、 a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:35:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME E
9、UROPENNE EUROPISCHE NORM EN ISO 14921 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 - Procdure dapplication de revtements obtenus par projection thermique pour
10、 les pices mcaniques (ISO 14921:2001) Thermisches Spritzen - Vorgehen fr das Anwenden thermischer Spritzschichten fr Bauteile im Maschinenbau (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 st
11、ipulate 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 e
12、xists 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 bo
13、dies 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 COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG
14、 Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14921:2001 E Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:35:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
15、 EN ISO 14921:2001 (E) Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、. . . . . . . . . . . . . . . . . . . . . .3 1Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 2Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17、 . . . . . . . . . . . . . . .3 3Component and coating design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 3.1Pre-inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
18、 3.2Component substrates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 3.3Coating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 4Prelimi
19、nary machining or grinding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 5Masking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 6Methods of surface preparatio
20、n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 7Spraying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 8Inspection after spraying . . . . . . . . . . . .
21、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 9Sealing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 10Finishing . . . . . . . . . . . . . . . . . . . . . . . . . .
22、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 11Final inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Annex A (informative) Flow chart for assessment of suitability of therma
23、l 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
24、 procedure specification or record . . . . . . . . . . . . . . .8 2 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:35:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 14921:2001 (E) Foreword The text of EN ISO 14921:2001 has been prepared by Technical Committee CEN/TC 240 “Thermal spr
25、aying 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 endo
26、rsement, 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
27、 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 therm
28、ally 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 conduc
29、tivity 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. Additiona
30、lly 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, provis
31、ions 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 b
32、y 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 1491
33、8 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 Comp
34、onent 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 compone
35、nt 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 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:35:34 GMT+00:00 2006, Uncontrolle
36、d Copy, (c) BSI 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
37、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
38、 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
39、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 pr
40、eparation and spraying. 3.3 Coating The different spraying processes as defined in EN 657 and materials available will result in differences in coating characteristics. To determine the most suitable coating system will require consideration of the following. Bond strength requirement; thickness req
41、uirement; surface requirement; surface load; thermal spraying may not be suitable for reaction on spot load sensitive; the properties required in the final deposit, e. g. resistance to different types of wear mechanism, corrosion, chemical attack, temperature and other environmental conditions; wher
42、e the level of porosity in the coating is unacceptable a suitable method of sealing, and type of sealant, shall be used; oxide content; where necessary this may be controlled by process variables and materials. Annex B shows a check list which details the information required to determine the most s
43、uitable coating system for the intended purpose. 4 Preliminary machining or grinding Any previously applied coatings shall be removed. However consideration shall be given to the possiblity that a prior treatment may have been carried out for special purposes. For example, for fatigue strength. Pre-
44、machining shall be carried out to remove wear profiles and ensure that the final coating thickness will be even. In the case of new parts the area to be sprayed shall be undercut to allow for the coating. Coatings shall be inlaid where possible. The forms or edges of the prepared area shall be suita
45、ble for the coating process. It is important that the surfaces are machined concentric to the relevant axis to ensure an even thickness of deposit. Sharp edges to be removed wherever possible. Wherever possible, pre-machining shall be carried out without the use of a lubricant. This is particularly
46、important in the case of porous substrate materials. Care shall be taken to ensure that during this operation stresses are not induced into the substrate which may have an adverse effect on the performance of the sprayed component. Note that, where necessary, the component should be degreased after
47、preliminary machining. 5 Masking Where appropriate the surfaces that do not require spraying can be masked with a suitable material. Ideally, this 4 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:35:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 14921:2001 (E) material shall be resi
48、stant to both abrasive grit blasting and thermal spraying. Otherwise separate masking for each operation shall be used Precautions shall be taken to ensure that the masking material does not contaminate the surface to be sprayed at all times. 6 Methods of surface preparation Where trapped contaminat
49、ion is identified under clause 4, this must be removed and the surface cleaned immediate- ly before surface preparation commences. A well prepared, activated surface is required to achieve maximum bond strength to metallic substrates. Grit blasting is the normal method of achieving this. All other surface preparation methods shall be agreed between the contracting parties. The surface preparation shall be in accordance with EN 13507:2001. 7 Spraying The sprayed coating should be applied as soon as possible after preparation with
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