1、 STD-BSI BS EN IS0 2738-ENGL 2000 Lb24bb7 08232Lb TZ0 BRITISH STANDARD Sintered metal materials, excluding hardmetals - Permeable sintered metal materials - Determination of density, oil content and open porosity The European Standard EN IS0 27381999 has the status of a British Standard ICs 77.160 B
2、S EN IS0 2738:ZOOO NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPRIGHT LAW STD-BSI BS EN IS0 2738-ENGL 2000 = Lb24bb9 0823237 9b7 M BS EN IS0 27382000 National foreword This British Standard is the English language version of EN Is0 2738: 1999. It is identical with IS0 27381999. It sup
3、ersedes BS 56W3-3.2:1988 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ISW65, Sintered metal components, which has the responsibility to: - aid enquirers to understand the tea - present to the responsible internationalEuropean committee any enquirie
4、s on the interpretation, or proposals for change, and keep the UK interests informed - monitor related international and European developments and promulgate them in the LK A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention i
5、s drawn to the fact that CEN and CENELEC Standards normaily include an annex which lists normative references to international publications with their corresponding European publications. The British Standa,rds which hplement these international or European publications referred to in this document
6、may be found in the BSI Standards Catalogue under the section entitled Internationd Standards Correspondence Index”, or by using the Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ail the necessary provisions of a contract. Users of British s
7、tandards 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, the EN IS0 title page, the EN Is0 foreword page, the IS0 title page, pag
8、e ii, pages 1 to 10, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the S
9、tandards Committee and comes into effect on 15 January 2000 Amendments issued since publication Amd. No. Jconunents O BSI 01-2000 ISBN O 580 35415 6 STD-BSI BS EN IS0 2738-ENGL 2000 Lb24bb7 0823238 8T3 W EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 2738 November 1999 ICs 7.160 English ve
10、rsion Sintered metal materials, excluding hardmetals - Permeable sintered metal materials - Determination of density, oil content and open porosity (IS0 2738:1999) Matriaux mtalliques fritts, A lexclusion des mtaux durs - Matriaux mtalliques fritts permables - Dtemination de la masse volumique, de l
11、a teneur en huile et de la porosit ouverte (IS0 2738: 1999) This European Standard was approved by CEN on 8 October 1999. CEN members are bound to comply with the CENICENELEC Intemal Regulations which stipulate the conditions for giving this European Standard the status of a national standard withou
12、t any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, Getman). A version in any other language mad
13、e by translation under the responsibility of a CEN member into its own language and notified to the Centrai Secretariat has the same status as the offiaal versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland,
14、Ireland, Italy. Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FUR NORMUNG COMITE EUROPBEN DE NORMALISATION Central Secretariat: rue de Stassart. 36 B-1050 BNUIS O 1999 CEN All rights of exploitation
15、in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 2738:1999 E - - - STD=BSI BS EN IS0 Z738-ENGL 2000 W lb2Libb7 0823239 73T EN IS0 2738:1999 Foreword The text of the International Standard IS0 2738:1999 has been prepared by Technical Committee ISO/TC 1 19 “Pow
16、der metallurgy“ in collaboration with CENES. 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 May 2000, and conflicting national standards shall be.withdrawn at .the.iatest by May 2000. According t
17、o the CEWCENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain
18、, Sweden, Switzerland and the United Kingdom. NOTE FROM CEWCS: The foreword is susceptible to be amended on reception of the German language version. The confirmed or amended foreword, and when appropriate, the normative annex ZA for the references to international publications with their relevant E
19、uropean publications will be circulated with the German version. Endorsement notice The text of the Intemational Standard IS0 2738:1999 was approved by CEN as a European Standard without any modification. STD*BSI BS EN IS0 2738-ENGL 2000 Lb2ibbS 0823220 451 EN IS0 2738:1999 INTERNATIONAL IS0 STANDAR
20、D 2738 Third edition 1999-1 1-01 Sintered metal materials, excluding hardmetals - Permeable sintered metal materials - Determination of density, oil content and open porosity Matriaux mtalliques fritts, a lexclusion des mtaux-durs - Matriaux mtalliques fritts permables - Dtermination de la masse vol
21、umique, de la teneur en huile et de la porosit ouverie Reference number IS0 2738:1999(E) STD-BSI BS EN IS0 2738-ENGL 2000 Lb2LibbS O823221 378 = EN IS0 2738:1999 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodie
22、s). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and n
23、on-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Pa
24、rt 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an international Standard requires approval by at least 75 YO of the member bodies casting a vote. International Standard IS0 2738 was prepared by Technical Committe
25、e ISO/TC 1 19, Powder metallurgy, Subcommittee SC 3, Sampling and testing methods for sintered metal materials (excluding hardmetals). This third edition cancels and replaces the second edition (IS0 2738:1987) which has been technically revised. STD-BSI BS EN IS0 2738-ENGL 2000 Lb24bb9 0823222 224 W
26、 EN IS0 2738:1999 Sintered metal materials, excluding hardmetals - Permeable sintered metal materials - Determination of density, oil content and open porosity 1 Scope This international Standard specifies methods of determining permeable sintered metal materials. the density, oil content and open p
27、orosity of It applies in particular to porous metal bearings and to structur parts produced by pressing and sintering metal powders. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard
28、. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below
29、. For undated references, the latest edition of the normative document referred to applies. Members of IS0 and IEC maintain registers of currently valid International Standards. IS0 750, Liquid chemical products for industrial use - Determination of density at 20 OC. IS0 13944, Lubricated metal-powd
30、er mixes - Determination of lubricant content - Modified Soxhlet extraction method. I 1 STD-BSI BS EN IS0 2738-ENGL 2000 II lb21ibb9 0823223 LbO M Symbol ml EN IS0 2738:1999 Designation Unit Initial mass of the test piece 9 3 Symbols and designations Table 1 - Symbols and designations Mass of the fu
31、lly impregnated test piece Mass of the fully or partially impregnated test piece plus supporting device (for Mass of the fully or partially impregnated test piece plus supporting device (for example suspension wire) weighed in air example suspension wire) weighed in water Volume of the test piece 9
32、9 g crn3 I m2 I Mass of the test piece after oil extraction and drying I Density of the water used Density of the oil initially in the test piece a Density of the impregnating oil used a I Pw gcm3 gicm3 gcm3 I I Pi I ar a The oil density is assumed to be known or, if not, to be determined in accorda
33、nce with IS0 758. I 4 Terms and definitions For the purposes of this International Standard the following terms and definitions apply. 4.1 density the density of the test piece may be expressed in two ways: 4.1.1 dry density the mass, after drying, divided by the volume 4.1.2 fully impregnated densi
34、ty (wet density) the fully impregnated mass divided by the volume 4.2 oil content the oil content of the test piece may be expressed in two ways: 4.2.1 percentage by volume the volume of the oil divided by the volume of the test piece and multiplied by 100 4.2.2 percentage of the volume of the open
35、porosity the volume of the oil divided by the volume of the open porosity and multiplied by 100 4.3 open porosity (of the test piece) the oil content after full impregnation divided by the volume of the test piece and multiplied by 100 expressed as a percentage by vol u me 4.4 volume (of the test pi
36、ece) total volume including the pores 2 - STD-BSI BS EN IS0 2738-ENGL 2000 m lb24bb7 0623224 UT7 m EN IS0 2738:1999 Test procedure Initial weighing of the test piece (see 8.1) Extraction of the oil contained in the pores of the Determination of the mass of the test piece after Full impregnation of t
37、he test piece with an oil of Determination of the mass of the fully Determination of the volume of the test piece test piece (see 8.2) oil extraction and drying (see 8.3) known density (see 8.4) impregnated test piece (see 8.5) (see 8.6) 5 Test procedures Symbol for result obtained Properties to be
38、determined Density Oil content Open porosity Dry Fully Yo (V/V) %of impregnated open porosity ml X X X X X X m2 X X X X X X X m3 X X X V X X X X Depending upon which of the properties is to be determined, some or all of the test procedures in clause 8 are carried out. Table 2 shows the test procedur
39、es that are carried out for the property to be determined. The values obtained for the various parameters are inserted in the respective formulae given in clause 9 to obtain the desired property. _ 6 Equipment 6.1 Analytical balance, of sufficient capacity and accurate to 0,Ol %. 6.2 Soxhlet extract
40、or, with oil solvent. 6.3 Device for weighing the test piece in air and in liquid NOTE 6.4 Vessel, large enough to accommodate the test piece and the device (6.3) for weighing it, containing distilled or deionized, and preferably degassed water, with 0,05 YO (V/V) to 0,lO % (V/V) wetting agent added
41、. 6.5 Apparatus for vacuum impregnation of the test piece with oil 6.6 Impregnation oil, of known density (see IS0 758 for the determination of the density of liquids). 6.7 Thermometer, accurate to k 0,5 OC. The liquid is usually water (see Figures 1, 2 and 3). 3 STD=BSI BS EN IS0 2738-ENGL 2000 lb2
42、qbh9 0823225 T33 EN IS0 2738:1999 7 Test piece 7.1 Usually the test piece is tested whole. If this is not possible, the test piece may be cut or broken into smaller parts to facilitate the various operations. It is oten most appropriate to test only a critical section of a component. 7.2 If the test
43、 piece has a mass less than 5 g a number of test pieces shall be tested together to obtain the average value. 7.3 The surface of the test piece shall be free of adhering dirt, grease or other foreign material. 7.4 The surface of the test piece shall be free from surplus oil. When removing any such s
44、urplus oil with an oil- absorbent material, care shall be taken to avoid removing oil contained in the pores. NOTE treatment. The presence of surplus oil on the surface of the test piece is most likely to occur after the full impregnation 8 Test procedures 8.1 Determination of the initial mass of th
45、e test piece Weigh the test piece in the condition in which it was received, to obtain ml NOTE substituted for m2 in the formulae given in 9.1 and 9.3. If the test piece is known to contain no oil, the procedures described in 8.2 and 8.3 are omitted. In this case, ml is 8.2 Removal of oil from the t
46、est piece by solvent extraction Approximately 3 h of soaking and about ten solvent changes are required to remove the oil from test pieces of average density and small wall thickness. For thick walls and high density, up to 24 h are sometimes required. NOTE 1 The Soxhlet extractor is a convenient ap
47、paratus for soaking the test piece in warm, freshly distilled oil solvent. The distillation rate determines the number of cycles and hence the number of solvent changes that occur. A suitable Soxhlet unit is described in IC0 13944. Continue the extraction to constant mass after evaporation of the so
48、lvent left in the pores. NOTE 2 Experience will indicate the best extraction time and distillation rate to use. Dry the test piece to constant mass (.e. until the reduction in mass produced by the last extraction does not exceed 0,Ol % at a temperature of 20 OC above the boiling point of the solvent
49、) then cool in a desiccator and weigh. Choose the solvent so that complete dissolution of the oil in question is ensured. This requirement shall be tested for separately. The solvent used shall be stated in the test report. For practical control purposes, other methods for removing the oil may be used (such as heating well below sintering temperatures in a protective atmosphere). In cases of dispute, the modified Soxhlet extraction method shall be the reference method (see IS0 13944).
