1.1 本指南涵盖了金属粉末和相关化合物在液体中的分散，以便随后用于粒度分析仪器。本指南描述了实现和确定色散的一般程序；它还列出了对某些材料有用的程序。 1.2 本指南不包括 干的 颗粒材料的分散。它仅表示液体分散体不合适，必须使用干分散体（参见 7.1.2.1 ). 关于制定方法的指导 干的 分散，见指南 E3340美元 . 1.3 本指南仅限于金属粉末和相关金属化合物。然而，本文所述的一般程序可用于其他颗粒材料，如陶瓷、颜料、矿物等，但要注意其重要性。 1.4 单位- 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 粉末分散在液体中的方法对粒度分布分析的结果有显著影响。如果粉末没有充分分散，分析将显示出过于粗糙、不稳定或不可重复的分布。因此，希望比较其分析的各方使用相同的分散技术非常重要。 4.2 本指南提供了衍生一系列金属粉末和化合物的分散技术的方法。对本指南所涵盖的所有材料进行液体分散粒度分析的所有各方都应使用该方法（参见 1.1 , 1.2 和 4.1 ). 4.3 表1 提供了一些分散程序，这些程序已被发现对此处列出的特定材料有用且一致。 这些只是 建议 分散程序；程序和分散检查 7.1.2 – 7.1.4 ，或指南中更详细的方法开发程序 E3340美元 ，仍应用于验证每种特定材料和粒度范围的充分分散性。 （A） 所述超声波功率和持续时间仅作为指示。在方法开发阶段，应寻求特定系统的特定条件。 （B） 吐温21，化学名称为聚氧乙烯 6. 山梨糖醇单月桂酸酯由Croda International PLC制造，可从各种化学供应商处获得。 （C） 三到五滴吐温21，30到50 mL水。 4.4 本指南应用于制备试验方法中使用的粉末 B761型 和 B822 以及分析液体分散系统中金属粉末粒度分布的其他程序。

1.1 This guide covers the dispersion in liquids of metal powders and related compounds for subsequent use in particle size analysis instruments. This guide describes a general procedure for achieving and determining dispersion; it also lists procedures that have been found useful for certain materials. 1.2 This guide does not include specific procedures for dry dispersion of particulate materials. It only indicates when liquid dispersion is not appropriate and dry dispersion must be utilized (see 7.1.2.1 ). For guidance on development of methods of dry dispersion, see Guide E3340 . 1.3 This guide is limited to metal powders and related metal compounds. However, the general procedure described herein may be used, with caution as to its significance, for other particulate materials, such as ceramics, pigments, minerals, etc. 1.4 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 The method of powder dispersion in a liquid has a significant effect on the results of a particle size distribution analysis. The analysis will show a too-coarse, unstable, or nonrepeatable distribution if the powder has not been dispersed adequately. It is therefore important that parties wishing to compare their analyses use the same dispersion technique. 4.2 This guide provides ways of deriving dispersion techniques for a range of metal powders and compounds. It should be used by all parties performing liquid-dispersed particle size analysis of all of the materials covered by this guide (see 1.1 , 1.2 , and 4.1 ). 4.3 Table 1 provides some dispersion procedures that have been found useful and consistent for the particular materials listed there. These are only suggested dispersion procedures; the procedures and dispersion checks of 7.1.2 – 7.1.4 , or the more detailed method development procedures of Guide E3340 , should still be used to verify adequate dispersion for each particular material and particle size range. (A) Stated ultrasonic power and duration times are given as an indication only. Specific conditions should be sought for the particular system in question during the method development phase. (B) Tween 21, chemically known as polyoxyethylene 6 sorbitan monolaurate, is manufactured by Croda International PLC, and is available from various chemical suppliers. (C) Three to five drops Tween 21 in 30 to 50 mL water. 4.4 This guide should be used in the preparation of powders for use in Test Methods B761 and B822 and other procedures that analyze metal powder particle size distributions in liquid-dispersed systems.