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ASTM B962-2008 用阿基米德原理测定压实或烧结粉末冶金(PM)产品密度的标准试验方法

ASTM B962-2008 用阿基米德原理测定压实或烧结粉末冶金(PM)产品密度的标准试验方法

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【英文标准名称】: Standard Test Methods for Density of Compacted or Sintered Powder Metallurgy (PM) Products Using Archimedesx2019; Principle
【原文标准名称】: 用阿基米德原理测定压实或烧结粉末冶金(PM)产品密度的标准试验方法
【标准号】: ASTM B962-2008
【标准状态】: 现行
【国别】: 美国
【发布日期】: 2008
【实施或试行日期】:
【发布单位】: 美国材料与试验协会(US-ASTM)
【起草单位】: B09.04
【标准类型】: (Test Method)
【标准水平】: ()
【中文主题词】:
【英文主题词】: density; green density; impregnated density; PM products; powder metallurgy products; sintered density
【摘要】: 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. Archimedesx2019; 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. 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. The sintered density of sintered PM parts and sintered PM test specimens is used as a quality control measure. The impregnated density of sintered bearings is normally measured for quality control purposes as bearings are generally supplied and used oil-impregnated.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 B 311. 1.3 The current method is applicable to green compacts, sintered parts, and green and sintered test specimens. 1.4 With the exception of density values, for which the g/cm3 unit is the industry standard, the values stated in SI units are to be regarded as the standard. The values given in parentheses are converted in accordance with IEEE/ASTM SI 10 and are for information only. 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 and health practices and determine the applicability of regulatory limitations prior to use.
【中国标准分类号】: H16
【国际标准分类号】: 77_16
【页数】: 6P.;A4
【正文语种】: 英语

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