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  4. Graphical based characterisation and modelling of material gradients in porosified LTCC
 
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Graphical based characterisation and modelling of material gradients in porosified LTCC

Publikationstyp
Journal Article
Date Issued
2014-09
Sprache
English
Author(s)
Steinhäußer, Frank  
Talai, Armin  
Steiger-Thirsfeld, Andreas  
Kölpin, Alexander  orcid-logo
Weigel, Robert  
Bittner, Achim  
Schmid, Ulrich  
TORE-URI
http://hdl.handle.net/11420/6673
Journal
Journal of the European Ceramic Society  
Volume
34
Issue
11
Start Page
2833
End Page
2838
Citation
Journal of the European Ceramic Society 11 (34): 2833-2838 (2014-09)
Publisher DOI
10.1016/j.jeurceramsoc.2014.01.021
The chemical composition of low temperature cofired ceramics (LTCC) allows to locally embed air into sintered substrates by a selective wet chemical etch process. Therefore, LTCC substrate with areas of low permittivity can be created without material combination. The presented graphical method of material component contrast images enables the evaluation of their most important material properties which are their component distribution, their porosification gradient and their residual bearing surface. The graphical method, including focused ion beam and scanning electron microscopy analyses, is applied to different commercially available LTCC types having two porosification states each. Derived mathematical models, which are suitable for finite element method implementation, allow the characterisation of the effective permittivity reduction while keeping a maximum residual surface area for, e.g., metallisation purposes. The shape of the optimum material distribution function features an 'air pocket' of small width and a depth being dependent on the application specific operating frequency.
Subjects
Dielectric properties
Glass ceramics
Graphical method
Porosity
Wet etching
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