ISO INTERNATIONAL STANDARD 24369 First edition 2005-10-01 Fine ceramics (advanced ceramics, advanced technical ceramics) Determination of content of coarse particles in ceramic powders by wet sieving method CeramiquestechniquesDetermination ducontenuenparticules grossieres des poudres de ceramique par la methode de tamisage humide Reference number ISO 24369:2005(E) @ISO2005 hout license from IHS Not for Resale ISO24369:2005(E) Contents Page Foreword. 1 Scope 2 Terms and definitions. 3 Apparatus 4 Sampling... 2 5 Measuring procedures 2 6 Calculation 7 Report ii CopyrightIntemtionaloanizasadardzalonghtsreserved ense with hout ficense from IHS Not for Resale ISO24369:2005(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through IsO InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. The main task of technical committees is to prepare International Standards. 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 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO24369waspreparedbyTechnical Committee ISO/TC206,Fine ceramics @ ISO 2005 - All rights reserved Copyright Inter onalOrganizationforStandardizatior Not for Resale INTERNATIONAL STANDARD ISO24369:2005(E) Fine ceramics (advanced ceramics, advanced technical ceramics) Determination of content of coarse particles in ceramic powders by wet sieving method 1 Scope This International Standard specifies the procedure to determine the content of coarse particles in a fine procedure is applicable to fine ceramic powders of both micrometre and submicrometre size ranges. It is valid when there are greater than 10 mg/kg coarse particles in the powders. NOTE 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 coarseparticles particles and/or aggregates that cannot pass a 500 mesh sieve with25 μmmesh size 2.2 percentage of coarse particles ratio of the mass of the coarse particles (remaining on the sieve) to the total mass of the powder sample analysed 2.3 suspension ceramic powder suspended in an aqueous medium 2.4 solid content (powder + medium) 3 Apparatus 3.1 Sieve: 500 mesh (the aperture size is 25 μm) A stainless-steel rimmed sieve is recommended. 3.2 Analytical balance, having a readability of at least 0,1 mg 3.3 Bottle: a glass weighing bottle with known mass ma 3.4 Glass beaker, with a known mass me and a volume of at least 250 cm3. Copyrahtintematlinal organizanion for standardzalon ghts reserved 1 Not for Resale ISO24369:2005(E) 3.5 Pipette, 10 ml. 3.6 Oven:capable ofcontrolling atemperature of 105°C ±5°C. 3.7 Stirring apparatus: magnetic stirrer and polytetrafluoroethylene (PTFE)-coated stir bar. 3.8 Ultrasonicbath 3.9 Desiccatororvacuumchamber. 4 Sampling 5 Measuring procedures In the following measuring procedures, humidity is easily adsorbed either from hands or from the air. Therefore, be careful not to touch the sieve and glass weighing bottle with bare hands; use clean tongs or powder-free latex gloves 5.1Washingand drying of sieve Submerse the entire sieve in a clean ultrasonic bath filled with distilled water, and ultrasonicate for 10 min. It is Remove the sieve and drain bath, refill with fresh distilled water, and repeat the treatment. After washing, place the sieve in an oven, and dry it at 105 C for 2 h. After drying, cool the sieve down to for at least 10 min. 5.2 Weighing of sieve After