Forming Textured Microstructures via the Gelcasting Technique

Abstract

Crystallographically textured samples of iron titanate were produced by gelcasting in the presence of a strong magnetic field. Texture was assessed by measuring X-ray pole figures on samples that were cast in different orientations relative to the applied field. Specimens in this study exhibit fibertype texture, with the b-axes aligned parallel to the applied field. Peak texture strengths were on the order of 3 and 48 multiples of a random distribution (MRD) when processed in a 3.2 and 8.4 T magnetic field, respectively. This study shows that a combination of gelcasting with magnetic-fieldassisted processing provides a convenient method for fabricating samples which can be used to study the role of crystallographic texture on the physical properties of polycrystalline ceramics, e.g., their elastic or fracture behavior.

Ceramic Laminates by Gelcasting

“…Two examples of magnetic alignment are shown in drastically different types of magnetic ceramics. The first is iron titanate, FeTiO 5 , a paramagnetic material, which can be aligned with considerable texture in high magnetic fields 50,92,93 . Although the magnetic susceptibility is anisotropic, there appears to be little anisotropic grain growth, and hence, crystallographic, but not microstructural texture, results.…”

Cellulose acetate based gelcasting process for Gd-containing ceramic bodies

“…Numerous articles were already published about gelcasting methods (e.g. [1][2][3][4][5][6][7][8]. However, the majority of known gelcasting routes use waterbased systems, i.e.…”

Fabrication of textured ferroelectric ceramics by magnetic alignment via gelcasting

“…In the present work, gelcasting provides an approach to lock in situ the particles after magnetic alignment in the slurry. 12 Ferroelectric ceramics with perovskite structure, bismuth layer structure and tungsten bronze structure are the main classes, and grain-oriented microstructures have been sought using TGG, RTGG and hot forging. [2][3][4][5][6][7][8][9] In the present study, three typical ceramics, Bi 4 Ti 3 O 12 (BIT) with bismuth layer structure, Sr 0.5 Ba 0.5 Nb 2 O 6 (SBN) with tungsten bronze structure and BaTiO 3 (BT) with perovskite structure were selected as model materials.…”