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Comparison of alumina and magnesia filled PTFE composites for microwave substrate applications

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Title Comparison of alumina and magnesia filled PTFE composites for microwave substrate applications
 
Creator MURALI, KP
RAJESH, S
PRAKASH, O
KULKARNI, AR
RATHEESH, R
 
Subject dielectric measurements
polymers
composite materials
ceramics
dielectric properties
 
Description Flexible microwave substrates have been fabricated using micron size powders of alpha-Al(2)O(3) and MgO filled in polytetrafluoroethylene (PTFE) matrix through SMECH process, comprising of sigma mixing (SM), extrusion (E), calendering (C) followed by hot pressing (H). Prior to fabrication of the composites, silane coating on the fillers was done to preclude moisture absorption. Filler loading in the PTFE matrix was varied in steps (10-70wt.%) and their effects on the microwave dielectric properties (epsilon(r)' and tan delta) at X-band (8.2-12.4 GHz) were evaluated using waveguide cavity perturbation technique. Optimum filler loading for both alumina and magnesia filled composites were found out by systematically varying the filler concentration. SEM microgrpahs revealed uniform distribution of filler in the matrix without any delamintaion of stacked calendered tapes. A comparative study of the magnesia filled samples with and without silane coating is also carried out to ascertain the effects of brucite phase formed during silane coating process on the dielectric and moisture absorption properties of composite substrates. (C) 2008
 
Publisher ELSEVIER SCIENCE SA
 
Date 2011-07-27T17:38:15Z
2011-12-26T12:57:52Z
2011-12-27T05:45:43Z
2011-07-27T17:38:15Z
2011-12-26T12:57:52Z
2011-12-27T05:45:43Z
2009
 
Type Article
 
Identifier MATERIALS CHEMISTRY AND PHYSICS, 113(1), 290-295
0254-0584
http://dx.doi.org/10.1016/j.matchemphys.2008.07.089
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7286
http://hdl.handle.net/10054/7286
 
Language en