EN 24496-1993 en Metallic Powders - Determination of Acid Insoluble Content in Iron Copper Tin and Bronze Powders《金属粉末 铁 铜 锡和青铜粉末中酸不溶物含量的测定(ISO 4496-1978)》.pdf
《EN 24496-1993 en Metallic Powders - Determination of Acid Insoluble Content in Iron Copper Tin and Bronze Powders《金属粉末 铁 铜 锡和青铜粉末中酸不溶物含量的测定(ISO 4496-1978)》.pdf》由会员分享,可在线阅读,更多相关《EN 24496-1993 en Metallic Powders - Determination of Acid Insoluble Content in Iron Copper Tin and Bronze Powders《金属粉末 铁 铜 锡和青铜粉末中酸不溶物含量的测定(ISO 4496-1978)》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、CEN ENx2449b 93 3404589 0047082 148 EUROPEAN STANDARD EN 24496 NORME EUROPENNE EUROPISCHE NORM April 1993 UDC 621.762 : 669-492.2 : 620.1 : 543.726 Descriptors: Powder metallurgy, metallic powder, iron, copper, tin, bronzes, chemical analysis, determination of content, acids, insoluble matter Englis
2、h version Metallic powders - Determination of acid insoluble content in iron, copper, tin and bronze powders (IS0 4496 : 1978) Poudres mtalliques - Dtermination de la teneur en insolubles dans les acides pour les poudres de fer, de cuivre, dtain et de bronze (IS0 4496 : 1978) (IS0 4496 : 1978) Metal
3、lpulver - Bestimmung der sureunlslichen Bestandteile in Eisen-, Kupfer-, Zinn- und Bronzepulvern This European Standard was approved by CEN on 1993-04-02. CEN members are bound to comply with the CENCENELEC Internal Regulations which stipulate the conditions for giving this European Standard the sta
4、tus 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 Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A
5、version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany,
6、 Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 0 1993 Copyrig
7、ht reserved to CEN members Ref. No. EN 24496 : 1993 E CEN EN*2449b 93 9 3404589 O047083 084 Page 2 EN 24496: 1993 Foreword In 1992, IS0 4496 : 1978 Metallic powders - Determination of acid insoluble content in iron, cornie?; tin and brow powders was submitted to the CEN Primary Questionnaire procedu
8、re. Following the positive result of the CEN/CS Proposal IS0 4496 : 1978 was submitted to the CEN Formal Vote. The result of the Formal Vote was positive. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the lat
9、est by October 1993, and conflicting national standards shall be withdrawn at the latest by October 1993. According to the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ire
10、land, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. CEN EN*2449b 93 = 3404589 0047084 TL0 Density, p 1 SCOPE Concentration of solution This International Standard specifies methods for deter- mining, in iron, copper, tin and bronze powders, the approxi
11、mate content of non-metallic materials which are insoluble in the ordinary mineral acids. The insoluble matter referred to is generally considered to be acid-insoluble silica and silicates, carbides, alumina, clays or other refractory oxides which are either present in the raw material from which th
12、e powders are manufactured or introduced during the manufacturing process. Hydrochloric acid (3.1) Hydrochloric acid (3.2) Potassium thiocyanate (3.3) Nitric acid (3.4) 2 FIELD OF APPLICATION The methods are applicable to lubricant-free metallic powders of iron, copper, tin, alloy bronze and element
13、al mixtures of copper and tin. 1.19 1+1 1.19 1 + 25 1.42 concentrated 5% 3 REAGENTS During the analysis, use only reagents of recognized ana- lytical grade, and only distilled water or water of equivalent purity. See the table for the reagents required. Hydrochloric acid (3.5) Nitric acid (3.6) Hydr
14、ogen peroxide (3.7) Ammonium acetate (3.8) Sodium diethyldithiocarbamate (3.9) Sodium sulphide (3.10) Hydrogen sulphide (3.1 1) Type of powder I Iron 1.19 concentrated 1.42 1+1 30 96 200 911 4% I Copper Tin Bronze Copper Bronze Tin ( Page 3 EN 24496 : 1993 4 APPARATUS Ordinary laboratory apparatus a
15、nd 4.1 Laboratory balance of sufficient capacity and capable of weighing to an accuracy of 5 0,000 1 g. 4.2 Glass filter funnel, diameter approximately 70 mm. 4.3 Filter paper for medium precipitates, diameter approxi- mately 1 1 O mm. 4.4 Furnace, capable of operating between 900 and 1 ooooc. 4.5 F
16、used silica or porcelain crucibles, pretreated to constant mass at 900 to 1 O00 OC and stored in a desiccator. 5 SAMPLING 5.1 Determine the content of insoluble matter on two test portions. 5.2 The massof the test portion shall be approximately 5 9. Reagent CEN ENW449b 93 m 3404589 0047085 957 W Pag
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