ISO 4497-2020 pdf free.Metallic powders – Determination of particle size by dry sieving.
This document specifies a method of determining the particle size distribution of metallic powders by dry sieving into size fractions.
The method is applicable to dry, unlubricated metallic powders, but not applicable to powders in which the morphology differs markedly from being equiaxial, for example flake-type powders.
The method is not applicable to metallic powders having a particle size wholly or mostly under 45 iim.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 565, Test sieves — Metal wire cloth, perforated metal plate and elect roformed sheet — Nominal sizes of openings
ISO 259 1-1, Test sieving — Part 1: Methods using test sieves of woven wire cloth and perforated metal plate ISO 33 10-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
3 Terms and definitions
No terms and definitions are listed in this document.
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4 Principle
The metallic powder are separated into particle size fractions by shaking through a set of wire cloth test sieves. The test sieves shall be stacked in consecutive order of size of aperture openings.
The fractions retained on each sieve and the fraction passing the finest sieve are weighed.
5 Test equipment
5.1 Calibrated cloth sieves.
A calibrated series of non-magnetic wire cloth sieves, having different nominal aperture sizes shall be used. Each sieve cloth shall be mounted in a non-magnetic metal frame having a nominal diameter of 200 mm and a nominal depth within the range 25 mm to 50 mm.
NOTE  ISO 3310-1 specifies a nominal depth of 50 mm or 25 mm.
The test sieve frames and spacers, if used, shall nest seamlessly with one another, and the set shall be completed with a lid on top and a collecting pan below the bottom sieve.
The calibration of sieves shall be carried out according to Iso 3310-1.
The aperture size of the test sieves shall be chosen from the principal size (R 20/3) sieves of ISO 565. If this is not appropriate the principal sizes can be partly or totally replaced from one of the intermediate sizes (R 40/3 or R 20] The aperture sizes of the test sieves shall be chosen so as to determine adequately the particle size distribution of the sample (see Clause 8].
If mechanical sieving machine is used, see 71.
5.2 Balance, capable of weighing at least 100 g to an accuracy of土0,05 g shall be used.
5.3 A soft brush, shall be used.
6 Preparation of test portion
6.1 General
In general, the powder shall be tested in the as-received condition. If necessary, the powder may be dried. However, if the powder is susceptible to oxidation, the drying shall take place in vacuum or an inert gas.
6.2 Mass of test portion
The test portion shall have a mass of approximately 100 g for powders having an apparent density greater than 1,50 g/cm3. If the apparent density of the powder is 1,50 g/cm3 or less, the mass of the test portion shall be approximately 50 g.
7 Procedure
7.1 General
The series of test sieves selected shall be assembled complete with lid and collecting pan in consecutive order of size of apertures, with the sieve having the largest aperture on top. The test portion shall be placed on the top sieve and this shall be closed by a lid.ISO 4497 pdf download.