1.1 本试验方法包括根据Brunauer、Emmett和Teller（BET）的方法，基于气体的多层物理吸附测定高级陶瓷材料（固体形式）的表面积 ( 1. ) 2. 并基于IUPAC建议（1984年和1994年） ( 2. , 3. ) . 本试验方法规定了适用于许多商用物理吸附仪器的一般程序。本试验方法为选定的常见陶瓷材料提供了特定的样品放气程序，包括:非晶和晶体硅、TiO 2. 高岭土、氮化硅、碳化硅、氧化锆等。多点BET ( 1. ) 方程以及BET方程的单点近似是所有计算的基础。本试验方法适用于测量深度至少为0.05m的高级陶瓷粉末的表面积 2. （如果除氮外，氪在77。 35 K用作吸附剂）。 1.2 本试验方法不包括适用于高级陶瓷材料放气的所有现有程序。然而，它全面总结了文献中推荐的用于选定类型陶瓷材料的程序。研究者应确定所列程序的适当性。 1.3 以国际单位制表示的数值应视为标准值。以国际单位制表示所有数值，除非特定仪器软件使用替代单位报告表面积。在这种情况下，在最终书面报告中提供报告的和等效的国际单位制。通常（在物理吸附和相关领域）将固体的（比）表面积报告为m 2. /g并且，作为惯例，许多仪器（以及标准物质证书）将表面积报告为m 2. g –1 ，而不是使用国际单位制（m 2. 公斤 –1 ). 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 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《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 先进的陶瓷粉末和多孔陶瓷体通常具有非常精细的颗粒形态和结构，以高表面体积比（S-V）为特征。这些具有高S-V比的陶瓷通常表现出增强的化学反应性和较低的烧结温度。 许多中间和最终陶瓷加工步骤的结果由高级陶瓷的比表面积控制或与之相关。陶瓷吸附剂、分离过滤器和膜、催化剂、色谱载体、涂层和颜料的功能通常取决于孔隙度的数量和分布及其对比表面积的影响。 5.2 该测试方法测定了高级陶瓷粉末和多孔体的比表面积。先进陶瓷的供应商和用户都可以利用这些陶瓷的表面积知识进行材料开发和比较、产品表征、设计数据、质量控制和工程/生产规范。

1.1 This test method covers the determination of the surface area of advanced ceramic materials (in a solid form) based on multilayer physisorption of gas in accordance with the method of Brunauer, Emmett, and Teller (BET) ( 1 ) 2 and based on IUPAC Recommendations (1984 and 1994) ( 2 , 3 ) . This test method specifies general procedures that are applicable to many commercial physical adsorption instruments. This test method provides specific sample outgassing procedures for selected common ceramic materials, including: amorphous and crystalline silicas, TiO 2 , kaolin, silicon nitride, silicon carbide, zirconium oxide, etc. The multipoint BET ( 1 ) equation along with the single-point approximation of the BET equation are the basis for all calculations. This test method is appropriate for measuring surface areas of advanced ceramic powders down to at least 0.05 m 2 (if in addition to nitrogen, krypton at 77.35 K is utilized as an adsorptive). 1.2 This test method does not include all existing procedures appropriate for outgassing of advanced ceramic materials. However, it provides a comprehensive summary of procedures recommended in the literature for selected types of ceramic materials. The investigator shall determine the appropriateness of listed procedures. 1.3 The values stated in SI units are to be regarded as standard. State all numerical values in terms of SI units unless specific instrumentation software reports surface area using alternate units. In this case, provide both reported and equivalent SI units in the final written report. It is commonly accepted and customary (in physical adsorption and related fields) to report the (specific) surface area of solids as m 2 /g and, as a convention, many instruments (as well as certificates of reference materials) report surface area as m 2 g –1 , instead of using SI units (m 2 kg –1 ). 1.4 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. 1.5 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 ====== 5.1 Advanced ceramic powders and porous ceramic bodies often have a very fine particulate morphology and structure that are marked by high surface-to-volume (S-V) ratios. These ceramics with high S-V ratios commonly exhibit enhanced chemical reactivity and lower sintering temperatures. Results of many intermediate and final ceramic processing steps are controlled by, or related to, the specific surface area of the advanced ceramic. The functionality of ceramic adsorbents, separation filters and membranes, catalysts, chromatographic carriers, coatings, and pigments often depends on the amount and distribution of the porosity and its resulting effect on the specific surface area. 5.2 This test method determines the specific surface area of advanced ceramic powders and porous bodies. Both suppliers and users of advanced ceramics can use knowledge of the surface area of these ceramics for material development and comparison, product characterization, design data, quality control, and engineering/ production specifications.