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Influences of Particle Size of Alumina Filler in an LTCC System
Author(s) -
Seo Yong Jun,
Jung Jin Hyun,
Cho Yong Soo,
Kim Jun Chul,
Kang Nam Kee
Publication year - 2007
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/j.1551-2916.2006.01438.x
Subject(s) - materials science , crystallization , filler (materials) , particle size , composite material , wetting , dielectric , ceramic , anorthite , particle (ecology) , phase (matter) , glass ceramic , mineralogy , chemical engineering , chemistry , oceanography , optoelectronics , organic chemistry , engineering , geology
A low temperature co‐fired ceramics system consisting of a typical calcium aluminoborosilicate glass and alumina filler was used to investigate the effects of four different sizes, 13 nm, 0.5, 3, and 39 μm, of a commercially available alumina filler on the resultant densification, crystallization, and dielectric properties. There was definitely a proper range of alumina particle size, which leads to desirable densification and enhanced dielectric properties. The onset temperatures of densification and crystallization depended strongly on the filler particle size. The 3 μm sample as an optimum filler size exhibited a promising performance of k ∼8.1 and Q ∼160 at a resonant frequency of 14.8 GHz, which results from early densification and intensive crystallization of the anorthite CaAl 2 Si 2 O 8 phase. Particularly, the use of nano‐sized alumina (13 nm) retarded both densification by ∼200°C and crystallization by ∼80°C compared with the results of the 3 μm alumina case. The dependence of the filler particle size was postulated as being related to the wetting and connectivity behavior of glass through consequent inter‐reactions between glass and ceramic.