Influence of Shrinkage Mismatch between Copper and Ceramics on Dimensional Control of the Multilayer Ceramic Circuit Board

Abstract

The shrinking behavior of Cu/ceramic circuit boards as it applies to controlling dimensional tolerances was studied. This report includes the shrinking behavior of ceramics and copper and of the Cu/ceramic interface.

Three-dimensional shrinkage behavior of green tapes derived from spherical-shaped powders: Experimental studies and numerical simulations

“…2 Therefore, any uncontrolled shrinkage anisotropy during binder burnout and sintering can lead to device failure. [3][4][5][6] During tape casting, due to the shear flow gradient under the blade of the casting head as well as to the constrained drying process, non-spherical ceramic particles are predominantly oriented parallel to the casting direction. [7][8][9][10][11][12][13][14][15] Because of this anisotropic green tape microstructure, anisotropic shrinkage occurs: 8,13,14,16 ε z ε y ε x (1) * Corresponding author.…”

Effects of Alumina on Devitrification Kinetics and Mechanism of K2O–CaO–SrO–BaO–B2O3–SiO2Glass

“…Several approaches to the preparation of LTCC systems have been reported including glass+ceramics (multiphase ceramics) [7][8][9][10] and glass-ceramics (crystallizable glass). [11][12][13][14][15][16] The T2000 tape dielectric of Motorola is a LTCC glassceramic material system that includes a specially formulated K 2 O-CaO-SrO-BaO-B 2 O 3 -SiO 2 (TG) glass, Al 2 O 3 as ceramic filler and TiO 2 as a T f (temperature coefficient of resonant frequency) adjustment agent. 1,2) In the first paper of this series, 17) two crystalline phases of cristobalite (SiO 2 ) and pseudowollastonite [(Ca, Ba, Sr)SiO 3 ] are reported to precipitate out of the initially amorphous, crystallizable TG glass powder at temperatures from 800 to 1000 C. The formation of crystalline phases exhibits a characteristic incubation period that decreases with increasing sintering temperature.…”

Low Temperature Cofired Ceramics

“…However, the composition can produce very complicated phase formation. Typical systems with this approach include the borosilicate glass (BSG) þ alumina by Fujitsu [69] and the lead borosilicate glass þ alumina by Dupont [70]. Table 12.3 presents the crystalline phases commonly considered for glass-ceramic systems.…”