Influence of tape cast parameters on texture formation in alumina by templated grain growth

Processing and mechanical response of highly textured Al2O3

“…The fracture toughness reported in Table 2 indicates that, in the parallel orientation, there is no increase in toughening due to texturing, in agreement with previous work. 13,14 The effective toughness of 1 vol%, 5 vol%, and 10 vol% templated alumina are similar to each other (3.03-3.11 MPa m 1/2 ). The 15% templated samples, however, are much less tough (2.55 MPa m 1/2 ).…”

“…This toughness anisotropy is not in agreement with previous studies. [13][14][15] Moreover, the toughness anisotropy increases with template loading. The fracture surfaces for textured samples tested in both orientations are shown in Fig.…”

“…While they found no significant increase in fracture toughness, they did find a modest 20% increase in flexural strength and a higher Weibull modulus as well as evidence of indentation crack inhibition normal to the c-axis. 14 Hall et al also found no increase in baseline fracture toughness in highly textured alumina fabricated by TGG, though there was evidence of R-curve behavior. 15 In addition they observed that, for fracture perpendicular to the c-axis, low velocity cracks tend to deflect and propagate intragranularly along the texture-plane.…”

Anisotropic kinetic of the kaolinite to mullite reaction sequence in multilayer ceramics

“…The laminated tapes are organized powder compacts with uniform and well controlled thickness, density and surface flatness. 24 Aqueous tape cast slurries were optimized in a previous study, as follow: grinding kaolin in a planetary mill (Fritsch, Pulverisette; 1 h; 200 rpm), with the addition of a dispersant (Dolaflux, 0.3 wt%), a binder (PVA 22,000; 5 wt%) and a plasticizer (PEG 300, 5 wt%); mixing 5% wt of alumina fibers by ball milling the suspension (1 h at 100 rpm).…”

Low-field dynamic magnetic alignment and templated grain growth of diamagnetic PMN–PT ceramics

“…In the transient state, particle alignment is governed by Jeffery's equations for motion of ellipsoids in shear flows and has been further discussed by Wu and Messing, and Snel et al [11][12][13] Steady state grain orientation distributions for shear alignment of ellipsoidal particles were calculated by Leal and Hinch 14 under the condition of weak thermal (Brownian) motion, in which the time for orientation to relax thermally is much longer than the orbital period of motion defined by Jeffery. The equilibrium particle orientation distribution for plate-like particles is given as 14 :…”