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Compilation and Evaluation of the Pressure‐Assisted Master Sintering Surface for Low‐Temperature Cofired Ceramics
Author(s) -
Brandt Bjoern,
Rabe Torsten
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13732
Subject(s) - sintering , materials science , shrinkage , creep , ceramic , composite material , deformation (meteorology)
Pressure‐assisted sintering ( PAS ) is an established procedure for the production of low‐temperature cofired ceramics ( LTCC ) without lateral shrinkage and minimal shrinkage tolerances for automotive and high‐frequency applications. To develop a feasible model for the prediction of densification during that process, master sintering curves ( MSC s) for the commercial LTCC DP951 were generated from thermomechanical analysis ( TMA ) data in the pressure regime from 2 to 500 kPa. Strain mainly related to creep deformation of the LTCC was identified by evaluation of the strain rate and was discarded for the determination of MSC parameters. It was found that no creep occurred at any pressure up to a relative density of 0.9. Different pressure levels can be modeled with the same activation energy of 400 kJ/mol. Densification curves predicted by the model were in good agreement with experimental data. Based on MSC s, the pressure‐assisted master sintering surface was compiled to illustrate the influence of pressure on densification. The results show that the MSC approach is a suitable method to feasibly predict the densification of LTCC during PAS.