1.1 本标准描述了一种测量通常具有表面连接孔隙率的粉末冶金产品密度的方法。 1.2 不可渗透PM材料的密度，即当浸入水中时不会增加质量的材料，可使用试验方法确定 B311 。 1.3 目前的方法适用于生坯、烧结零件、生坯和烧结试样。 1.4 除用于确定密度的密度值和质量外，使用克/立方厘米（g/cm 3. )克（g）单位是长期以来的行业惯例，以国际单位制为单位的数值应被视为标准。SI单位后括号中给出的值仅供参考，不视为标准值。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 5.1 复杂形状的PM零件的体积无法使用千分尺或卡尺精确测量。 由于密度是单位体积的质量，因此需要一种精确的体积测量方法。阿基米德原理可以用来计算被浸没物体排出的水量。为了适用于含有表面连接孔隙的PM材料，通过油浸渍或其他方式密封表面孔隙。 5.2 压实零件或试件的生坯密度通常是为了在压力机设置过程中提供帮助或用于质量控制目的而确定的。它还用于测定基础粉末、混合粉末和预混料的压缩性。 5.3 烧结PM零件和烧结PM试样的烧结密度被用作质量控制措施。 5.4 烧结轴承的浸渍密度通常是为了质量控制目的而测量的，因为轴承通常是以油浸渍的方式供应和使用的。

1.1 This standard describes a method for measuring the density of powder metallurgy products that usually have surface-connected porosity. 1.2 The density of impermeable PM materials, those materials that do not gain mass when immersed in water, may be determined using Test Method B311 . 1.3 The current method is applicable to green compacts, sintered parts, and green and sintered test specimens. 1.4 With the exception of the values for density and the mass used to determine density, for which the use of the gram per cubic centimetre (g/cm 3 ) and gram (g) units is the long-standing industry practice, the values in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered 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 ====== 5.1 The volume of a complex shaped PM part cannot be measured accurately using micrometers or calipers. Since density is mass per unit volume, a precise method for measuring the volume is needed. Archimedes’ principle may be used to calculate the volume of water displaced by an immersed object. For this to be applicable to PM materials that contain surface connected porosity, the surface pores are sealed by oil impregnation or some other means. 5.2 The green density of compacted parts or test pieces is normally determined to assist during press set-up, or for quality control purposes. It is also used for determining the compressibility of base powders, mixed powders, and premixes. 5.3 The sintered density of sintered PM parts and sintered PM test specimens is used as a quality control measure. 5.4 The impregnated density of sintered bearings is normally measured for quality control purposes as bearings are generally supplied and used oil-impregnated.