BS 4495-1969 Recommendations for the flame spraying of ceramic and cermet coatings《陶瓷和金属陶瓷度层的熔喷法推荐标准》.pdf
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1、BRITISH STANDARD CONFIRMED MAY 1988 BS 4495:1969 Recommendations for The flame spraying of ceramic and cermet coatingsBS4495:1969 These Recommendations, havingbeen approved by the Surface Coatings (other than Paints) Industry Standards Committee, were published underthe authority of the Executive Bo
2、ard on 23September1969 BSI 11-1999 The following BSI references relate to the work on these Recommendations: Committee reference SRE/13 Draft for comment 68/1695 ISBN 580 05632 5 Co-operating organizations The Surface Coatings (other than Paints) Industry Standards Committee, under whose supervision
3、 these recommendations were prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Assay Offices Committee of Great Britain Association of Metal Sprayers* British Bolt, Nut, Screw and Rivet Federation British Cycle and Motor Cycle
4、 Industries Association Limited British Electrical and Allied Manufacturers Association* British Jewellers Association British Non-Ferrous Metals Research Association British Steel Industry* Chemical Industries Association Electricity Council, the Generating Board and the Area Boards in EnglandandWa
5、les* Electronic Engineering Association Engineering Equipment Users Association Greater London Council Institute of Metal Finishing Institute of Sheet Metal Engineers Institute of Vitreous Enamellers Metal Finishing Association Ministry of Defence, Army Department* Ministry of Defence, Navy Departme
6、nt Ministry of Technology* Society of Motor Manufacturers and Traders Limited* Tin Research Institute Vitreous Enamel Development Council Zinc Development Association The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the f
7、ollowing, were directly represented on the committee entrusted with the preparation of these recommendations: British Ceramic Research Association Gauge and Tool Makers Association Institution of Mechanical Engineers Society of British Aerospace Companies Limited Welding Institute Individual firms A
8、mendments issued since publication Amd. No. Date CommentsBS4495:1969 BSI 11-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Coating material 1 3 Surface preparation 1 4 Application of coating 2 5 Coating thickness 2 6 Coating treatment 2 Appendix A Method o
9、f preparation of a reference surface by grit blasting 4 Appendix B Surface preparation by machining 4 Appendix C Methods for the determination of coating thickness 4 Appendix D Approximate conversion factors 5BS4495:1969 ii BSI 11-1999 Foreword These Recommendations make reference to the following B
10、ritish Standards: BS 410, Test sieves. BS 2451, Chilled iron shot and grit. For the deposition by flame spraying of materials generally known as ceramics, cermets (metal/ceramic composites) and numerous other non-metallic inorganic materials having a high melting temperature, conventional metal spra
11、ying equipment, detonation equipment and plasma flame equipment are employed. These materials are usually sprayed in rod or powder form. Coatings which are subsequently fused and fused enamel coatings are not covered by these recommendations. The wide variety of materials covered by these recommenda
12、tions and the various purposes for which they are employed, as described in Clause 1, make it difficult to issue specific requirements but it was felt that recommended practices for preparation, process control, finishing and testing, were desirable. The choice of coating, thickness of deposit, fini
13、sh and any special considerations are matters for agreement between the supplier and the purchaser, depending upon the duty which the finished article has to perform. Subject to such agreement compliance with the recommendations will ensure good results. A British Standard does not purport to includ
14、e all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi
15、andii, pages1 to5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4495:1969 BSI 11-1999 1 1 Scope These recommendations relate to the flame spraying of ceramics,
16、cermets and certain other high melting point materials for which the spraying conditions are similar, applied on to metals or any other suitable materials. The purposes for which the deposits are utilized include wear, galling and erosion resistance, heat insulation, corrosion and oxidation resistan
17、ce, electrical insulation, and resistance to “wetting” by molten metals. 2 Coating material 2.1 Composition. The composition of the material used for the coating should be the subject of agreement between the purchaser and the supplier. The tolerance limits for each significant constituent should be
18、 included in the agreement. No change in the composition of the material should be permitted without prior consent of the purchaser. 2.2 Form. The physical characteristics of the rod or powder used for spraying should be appropriate to the particular flame spraying apparatus employed. 3 Surface prep
19、aration The surface of the material to be coated should be cleaned so as to be visibly free from foreign matter and should be sufficiently roughened to allow the coating to be bonded to the contour of the surface of the base material. Particular attention should be given to the removal of loose resi
20、dues from the blasting process by brushing or vacuum cleaning the surface. The roughness of the surface to be coated should be formed by one of the methods described below: 1) Grit blast preparation. A type of grit should be used which will not be hygroscopic, and which will not cause deterioration
21、or have any detrimental effect either on the sprayed deposit or on the base material. The recommended grit is fused and crushed aluminium oxide, although chilled iron grit 1)may be used in cases where the presence of residual iron on the blasted surface is not detrimental. Crushed aluminium oxide sh
22、ould be of a size selected within the range through a 16 mesh sieve 2)and retained on a44mesh sieve 2) . Chilled iron grit 1)should be Grade G24. The surface produced should be comparable in cleanliness and degree of roughness to the reference surface produced by the method described in Appendix A.
23、Where there is a risk of distortion of thin material or damage to the surfaces of soft or friable material, some relaxation in the size of grit and degree of roughness may be necessary; the extent of any such relaxation should be the subject of agreement between the purchaser and the supplier. Alter
24、natively, consideration should be given to the use of an interlayer as outlined in 3) below. 2) Machine preparation, either by rough threading or by grooving followed by knurling of the ridges between the grooves (see Appendix B). This method is of limited acceptability. 1) BS 2451, “Chilled iron sh
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