A noncontact measuring system using a digital image analysis has been devised for the two-dimensional deformation of a powder compact during sintering, which is applicable to nonuniform shrinkages of graded compacts as well as complex-shape compacts prepared by metal injection molding. This article roughly introduces the system and describes an example of the measurement of two-dimensional sintering shrinkage of a metal/ceramic multilayer compact of the material combination of stainless steel (SUS304) and partially stabilized zirconia (PSZ). The measurement involves the edge enhancement of input images, the reading of the intensities of each pixel (picture element), and the determinations of the outline of a specimen and the distribution of diameter changes. It has been confirmed that thermal expansion and nonuniform deformation during sintering can be measured two dimensionally. In comparison with measurement by a conventional dilatometry, this method has enough accuracy for measuring sintering shrinkage in the temperature range from room temperature to 1573 K.
|Number of pages||5|
|Journal||Metallurgical and Materials Transactions B|
|Publication status||Published - 1995 Feb|
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