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ISO 13383-1 1st Edition, September 1, 2012 Fine ceramics (advanced ceramics, advanced technical ceramics) - Microstructural characterization - Part 1: Determination of grain size and size distribution
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 13383 describes manual methods of making
measurements for the determination of grain size of fine ceramics
(advanced ceramics, advanced technical 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 liner intercept size for each to be calculated
separately.
NOTE A method of determining volume fraction(s) of secondary
phase(s) can be found in ISO 13383:2; this will provide a means of
determining whether Method A1 or Method A2 should be applied in
borderline cases.
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 methods (see
Clause 4 and 8.4).