Effect of powder, binder and process parameters on anisotropic shrinkage in tape cast ceramic products

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

“…The front and rear doctor blades were adjusted to a gap height of 900 m and 1100 m, respectively. Because increasing shear rates above ∼12 s −1 did not result in an increased particle alignment, 8,12 the casting speed was kept at a constant value of 700 mm/min in this study. The filling height of the slurry reservoir was ∼20 mm in all cases.…”

“…For the measurement of the shrinkage in the casting plane, four hardness indentations in a distance of ∼25 mm from each other were punched into the green tapes using a Vickers diamond pyramid (Zwick GmbH & Co. KG, Ulm, Germany). 8 The exact distance between these indentations was measured before and after firing by means of a laser scanning microscopy (UBM Messtechnik GmbH, Ettlingen, Germany) with an accuracy of 10 nm in z-direction and 1 m in x-and y-directions. In order to measure the thickness shrinkage exactly, the average thickness along the two diagonals of small, non-warped specimens of about 1 mm × 1 mm in size was determined by means of laser scanning microscopy before and after debinding and pre-firing.…”

“…[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. Tel.…”

Blister defect formation within partially stabilized zirconia film during constrained sintering

“…Anisotropic shrinkage in constrained sintering film has been observed in many studies [10][11][12][13][14][15][16][17][18]. Although this phenomenon is obvious in the presence of inclusions and inhomogeneous green density distribution within the pre-sintered film, it also arises when the film is uniformly deposited onto the substrate.…”

Microstructure, sintering and properties of CaO–Al2O3–B2O3–SiO2 glass/Al2O3 composites with different CaO contents

“…Being in greatly accordance with the thirsty requirement of integration and miniaturization of passive devices in the microwave and millimeter wave communication industry, LTCCs are intensively employed in manufacturing RF modules, for instance, Bluetooth, GPS and antennas [1][2][3]. Several layers of substrate material constitute such modules with components like capacitors, inductors, resistors, resonators and filters buried in [4,5]. Applying metal material like Au, Ag and Cu as conducting material in a multi-layer device for transmission lines and ground planes is needed in order to minimize the microwave absorption loss.…”