Tape Casting Thin, Continuous, Homogenous, and Flexible Tapes of ZrB₂

Abstract

Using an organic solvent-based formulation, flexible and homogeneous ZrB 2 tapes were cast for potential use as advanced aerospace exploration vehicles. Dispersant concentrations were optimized for attrition-milled ZrB 2 powder using gravitational sedimentation and viscosity measurements. Tape cast slurry formulations with varying amounts of binder (6-8 vol%), plasticizer (7-11 vol%), and solids loading (20-23 vol%) were used to optimize the casting slurry. An optimal slurry formulation was determined based on cast tape uniform particle distribution and flexibility without cracking. Thermal gravimetric analysis of the optimized tape was used to create a binder burnout schedule that did not alter the tape structure or particle distribution. Our organic solvent-based tape casting approach results in minimum oxygen contamination after colloidal processing and robust cast tapes with a thickness of 280 lm and green density of~41% theoretic density after binder burnout.

Can zinc aluminate-titania composite be an alternative for alumina as microelectronic substrate?

“…This is reflected in the exothermic peak around 365 °C, which is followed by a minor weight loss up to 450 °C consequent to the binder burnout (see the diffused peak at 450 °C in DTA curve). The TG curve shows that a negligible weight loss (~0.4%) above 600 °C as reflected in the slow ascending of exothermic curve, which was believed to be due to the gradual combustion of residual carbon24252627. For alumina, a total weight loss of ∼11% is observed from 190 °C to 550 °C as shown in Fig 3(b).…”

LTCC tapes based on Al2O3–BBSZ glass with improved thermal conductivity

“…It is interesting to note that final tape casting slurry exhibited a shear thinning pseudo plastic behavior. This pseudo plastic shear thinning behavior is essential for tape casting slurry because the slurry experiences shear force under the action of the moving blade/carrier [35]. The shear thinning behavior is a consequence of the gradual breaking of the structures formed.…”

“…It is also used to identify the optimal concentration of the dispersant [35]. Good dispersed slurry is identified by slower rate of settling of the particles and higher final sediment density [34].…”

Textured ZrB₂-based ceramics by tape casting from rod-like ZrB₂ starting powders

“…Besides, there are also some microstructure tailoring methods to prepare textured ZrB 2 -based ceramics with improved properties, such as hot-forging (HF), 14) templated grain growth (TGG) 15) and strong magnetic field alignment (SMFA). 16), 17) The crystal structure of ZrB 2 belongs to hexagonal system, so it has the tendency to form anisotropic microstructure and demonstrate anisotropic properties in ZrB 2 -based ceramics with tailored microstructures, which is similar to other ceramics, such as Si 3 N 4 .…”