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In situ shrinkage measurement during pressure-assisted sintering of low temperature co-fired ceramic panels (2017)
Mieller, Björn ; Rabe, Torsten ; Rangelov, V.
Shrinkage measurements of miniaturized low temperature co-fired ceramics (LTCC) samples under load typically lead to collapsing of the samples, which hampers the characterization of shrinkage up to full densification. In this paper, a measurement setup is presented, which allows for in situ shrinkage measurements of practical, large LTCC panels during pressure-assisted sintering in a sintering press. The shrinkage behavior of two commercial LTCC systems (GreenTape 951 and Ceramtape GC) has been measured under loads of up to 1 MPa. No crushing of the specimens was observed and reproducible characterization of shrinkage up to full densification has been performed. Based on comparisons to thermomechanical analyzer measurements in this and other studies, it was found that the in situ approach is much better suited for shrinkage characterization of LTCC under load. Reproducibility and accuracy of the method are discussed and practical as well as more academic applications are proposed.
In-situ measurement of thickness shrinkage during pressure-assisted sintering of low temperature co-fired ceramics (2017)
Mieller, Björn
Shrinkage measurement of miniaturized low temperature co-fired ceramics (LTCC) samples under load typically leads to a collapsing of the sample due to the softening of the glassy phase, which hampers the characterization of shrinkage up to full densification. In practical sintering processes in contrast, LTCC panels are sintered under axial loads of up to 1 MPa without lateral shrinkage or collapsing of the structure. To characterize the shrinkage behavior during such processes, a measurement setup was developed, which allows for in-situ thickness shrinkage measurements of practical, large LTCC panels during pressure-assisted sintering in a sintering press. Using this setup, the shrinkage behavior of two commercial LTCC tapes (GreenTape 951 and Ceramtape GC) has been measured under loads of up to 1 MPa. No crushing of the specimens was observed and reproducible characterization of shrinkage up to full densification has been performed. Based on comparisons to thermomechanical analyzer measurements in this and other studies, it is concluded that the in-situ approach is much better suited for shrinkage characterization of LTCC under load.
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