Biopolymer‐Based Gel Casting of Ferroelectric Ceramics

Abstract

Ferroelectric ceramics have a wide range of industrial applications. While components can be formed through simple 'press and sinter' approaches, there is an increasing need for more flexible processing methods. Suspension based forming promotes greater homogeneity, through elimination of processing defects, and allows the formation of more complex shaped components. In the present work, the application of aqueous gel casting technologies is reviewed, and in particular the use of natural biopolymers as gelation aids for such approaches. Recent studies of the application of such technology to complex shape forming of BaTiO 3 ferroelectric ceramics are examined. Emphasis is placed upon a simple subtractive rapid prototyping method, utilizing aqueous gel casting in combination with green machining.

Obtenção e caracterização de nitreto de silício com microestrutura macroporosa para aplicação biomédica

“…Para este fim, a utilização de 2hidroxietil metacrilato (HEMA) (CAI; HUANG; YANG, 2005a) e HEMA com polivinil pirrolidona (CAI; HUANG; YANG, 2005b) foi estudada, porém, seu tempo de processamento e custo eram mais elevados, limitando sua utilização. Contudo, outra abordagem foi investigada, a utilização de biopolímeros de aplicações alimentares, como polissacarídeos (agarose, amidos, carragerina, curdlana) (ORTEGA et al, 2003;PLUCKNETT;MUNRO, 2014;JIA;KANNO;XIE, 2002;SANTACRUZ;NIETO;MORENO, 2005) e proteinas (gelatina e albumina) (ROSS-MURPHY, 1992;HE, 2011).…”