BS EN 623-3-2001 高级工程陶瓷.单片陶瓷.一般和纹理特性.粒度和粒度分布的测定(线性截取法表征)

标准号：BS EN 623-3-2001
中文标准名称：**工程陶瓷.单片陶瓷.一般和纹理特性.粒度和粒度分布的测定(线性截取法表征)
英文标准名称：Advanced technical ceramics - Monolithic ceramics - General and textural properties - Determination of grain size and size distribution (characterized by the linear intercept method)
标准类型：Q32
发布日期：2001/8/15 12:00:00
实施日期：2001/8/15 12:00:00
中国标准分类号：Q32
国际标准分类号：81.060.30
适用范围：This part of EN 623 describes manual methods of making measurements for the determination of mean linear intercept grain size of advanced technical ceramics using photomicrographs of polished and etched test pieces. This is not the true mean grain diameter, but a somewhat smaller parameter representing the average path length of a line drawn across a two-dimensional section. The relationship to true grain dimensions depends on grain shape and degree of microstructural anisotropy. This standard contains two methods: A and B. Method A applies to single-phase ceramics, and to ceramics with a principal crystalline phase and a glassy grain boundary phase of less than about 5 % by volume for which intercept counting suffices. Method B applies to ceramics with more than about 5 % by volume of pores or secondary phases, or ceramics with more than one major crystalline phase where individual intercept lengths are measured, which can optionally be used to create a size distribution. This latter method allows the pores or phases to be distinguished and the mean linear intercept size for each to be calculated separately. NOTE A method of determining volume fraction(s) of secondary phase(s) is under development as ENV 623-5; this will provide a means of determining whether Method A or Method B should be applied in borderline cases. Some users of this standard may wish to apply automatic or semiautomatic image analysis to micrographs or directly captured microstructural images. This is permitted by this standard provided that the technique employed simulates the manual method (see clause 4 and 8.4).