1.1 本试验方法包括孔隙率小于2%的粉末冶金（PM）材料和硬质合金密度的测定。该试验方法基于水驱替法。 注1: 浸入水中质量增加的试样表明试样含有表面连接的孔隙。未密封的表面孔隙度会吸收水分，导致计算的密度值高于真实值。如果出现此问题，则此测试方法不适用，测试方法 B962号机组 应改为使用。 1.2 单位- 除密度值和用于确定密度的质量外，使用克每立方厘米（g/cm 3. )克（g）单位是长期的行业惯例，SI单位的数值应视为标准值。SI单位后括号中给出的值仅供参考，不视为标准值。 1.3 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。 1.4 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 对于孔隙率小于2%的PM材料，可使用密度测量来确定零件是否已整体或在关键区域致密化至预期应用所需的程度。密度不能单独用于评估致密程度，因为化学成分和热处理会影响无孔密度。 5.2 对于硬质合金，密度测量通常用于确定硬质合金等级的成分是否有任何显著偏差。 对于直接碳化钨钴品位，关系很简单。对于复杂的碳化物等级（例如，除碳化钨钴外，还含有碳化钽或碳化钛或两者），情况更为复杂。如果测得的密度超过规定限值，则成分超出规定限值。规定限值内的测量密度不能确保成分正确；两种或两种以上成分之间的补偿可能导致成分错误的预期密度。不能仅用密度来评估硬质合金等级。

1.1 This test method covers the determination of density for powder metallurgy (PM) materials containing less than two percent porosity and for cemented carbides. This test method is based on the water displacement method. Note 1: A test specimen that gains mass when immersed in water indicates the specimen contains surface-connected porosity. Unsealed surface porosity will absorb water and result in calculated density values higher than the true value. This test method is not applicable if this problem occurs, and Test Methods B962 should be used instead. 1.2 Units— 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. 1.3 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. 1.4 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 For PM materials containing less than two percent porosity, a density measurement may be used to determine if the part has been densified, either overall or in a critical region, to the degree required for the intended application. Density alone cannot be used for evaluating the degree of densification because chemical composition and heat treatment affect the pore-free density. 5.2 For cemented carbides, a density measurement is normally used to determine if there is any significant deviation in composition of the carbide grade. For straight tungsten carbide-cobalt grades, the relationship is straightforward. For complex carbide grades (for example, grades containing tantalum carbide or titanium carbide, or both, in addition to tungsten carbide-cobalt), the situation is more complicated. If the measured density is beyond the specified limits, the composition is outside of the specified limits. A measured density within the specified limits does not ensure correct composition; compensation between two or more constituents could result in the expected density with the wrong composition. Density alone cannot be used for evaluating a cemented carbide grade.