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DIN Standards Committee Technology of Materials

Overview

This part of ISO 13383 describes manual methods of making measurements for the determination of grain size of fine ceramics using photomicrographs of polished and etched test pieces. The methods described in this part do not yield the true mean grain diameter, but a somewhat smaller parameter depending on the method applied to analyse a two-dimensional section. The relationship to true grain dimensions depends on the grain shape and the degree of microstructural anisotropy. This part contains two principal methods, A and B. Method A is the mean linear intercept technique. Method A1 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 A2 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.
Method B is the mean equivalent circle diameter method, which applies to any type of ceramic with or without a secondary phase. This method may also be employed for determining grain aspect ratio and a size distribution.
Some users of this part of ISO 13383 may wish to apply automatic or semiautomatic image analysis to micrographs or directly captured microstructural images. This is permitted by this part provided that the technique employed simulates the manual method (see Clause 4 and 8.4).
The text of ISO 13383-1:2012 has been prepared by Technical Committee ISO/TC 206 "Fine ceramics" of the International Organization for Standardization (ISO) and taken over as EN ISO 13383-1:2016 by Technical Committee CEN/TC 184 "Advanced technical ceramics", the secretariat of which is held by DIN.
The responsible German committee is Working Committee NA 062-02-91 AA "Terminologie von Hochleistungskeramik und Prüfung von monolithischen keramischen Werkstoffen und Pulvern" ("Terminology associated with advanced technical ceramics and testing of monolithic ceramics and powders") at DIN Standards Committee Materials Testing (NMP).

Document: references other documents

Responsible national committee

NA 062-02-91 AA - Terminology associated with advanced technical ceramics and testing of monolithic ceramics and powders  

Responsible european committee

CEN/TC 184 - Advanced technical ceramics  

Responsible international committee

ISO/TC 206/WG 7 - Monolithic ceramics/ Physical, mechanical and thermal properties