Sol-gel processing of functional and structural ceramic oxide fibers

Abstract

Abstract. Structural ceramic oxide fibers like oe-AlaO3, MgAI204 (spinel), Y3A15012 (YAG) and eutectic AIzO3-Y3AIsO12 as well as the functional Pb(Zrl_xTix)O3 (PZT) fibers were successfully prepared by sol-gel processing. All precursors are based on metal oxohydroxopropionates. A comparative study of sol-gel routes leading to spinnable sols demonstrates the key role of propionic acid as an excellent agent for controlling hydrolysis and condensation reactions.

New Sol–Gel Route for the Preparation of Pure α‐Alumina at 950°C

“…Acetic acid enhanced peptization and stabilized the sol against gelation by causing strong intermolecular hydrogen bonding. 23 The molar ratio of organic solvent to acetic acid to raw material was 40:3:1. After the addition of acetic acid, 2 min of stirring at a temperature of 90°C was needed to obtain a clear sol; continuous stirring at this temperature induced an increase in the sol viscosity until gelation occurred after several hours.…”

The effects of the PbO content upon the microstructure and the ferroelectric properties of undoped sol-gel derived PZT(53/47) fibers

“…PZT fibers were synthesized via a sol-gel process 20 with an oxidic bulk composition given by (PbO) 1+z . (Zr 0.53 Ti 0.47 )O 2 with z=À0.06, +0.02, +0.06 and +0.14 respectively.…”

Structural Evolution in Sol–Gel‐Derived Yttrium Aluminum Garnet–Alumina Precursor Fibers

“…For industrial and laboratory-based production of ceramic fibers, the sol-gel process is a commonly used route for the continuous spinning of precursor fibers with diameters Ͻ20 m. [11][12][13][14][15] Synthesis of sols from metal alkoxides and carboxylates allows precise control of stoichiometry and homogeneous distribution of dopants.…”