ArticlePublisher preview available

Manufacturing of Advanced Ceramic Components via Electrophoretic Deposition

Trans Tech Publications Ltd
Key Engineering Materials
Authors:
Jan Tabellion
Jan Tabellion
Jan Tabellion
  • This person is not on ResearchGate, or hasn't claimed this research yet.
Rolf Clasen
Rolf Clasen
Rolf Clasen
  • This person is not on ResearchGate, or hasn't claimed this research yet.
Read publisher preview
Download citation
To read the full-text of this research, you can request a copy directly from the authors.

Abstract

By means of electrophoretic deposition (EPD) ceramic or glass components and composites can be shaped fast with low energy input (electric field strengths in the range of 0.5 to 20 V/cm). High green densities up to 83% of the theoretical value could be achieved using suspensions with comparably low solid matter content (less than 75 wt.%) with optimised particle size distribution. The low viscosity of these suspension (%ap; 4 to 500 mPa·s) enables to deagglomerate effectively the suspended powders. Furthermore, the deposition rate is independent of the particle size. This enables the fast manufacture of ceramic of advanced glass and ceramic components from nanosized powders. Via electrophoretic deposition of nanosized particles within the pores of a green body a homogeneous densification can be achieved. Furthermore, components with functionally graded density, pore size or/and graded chemical composition were manufactured by means of electrophoretic impregnation (EPI). Another possible application of the EPI is the incorporation of secondary phases, that are difficult to incorporated from the fluid phase, into ceramic and glass-matrices.
A preview of this full-text is provided by Trans Tech Publications Ltd.
Content available from Key Engineering Materials 
This content is subject to copyright. Terms and conditions apply.
Key Engineering Materials Online: 2001-12-15
ISSN: 1662-9795, Vols. 206-213, pp 397-400
doi:10.4028/www.scientific.net/KEM.206-213.397
© 2002 Trans Tech Publications Ltd, Switzerland
All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans
Tech Publications Ltd, www.scientific.net. (Research Gate for subscription journals-12/02/24,12:53:27)
... EPD operating parameters, and the powder specific EPD characteristics. Further details about the EPD method, structures, and properties of the graded composites obtained can be found [82] . Combined techniques for manufacture of tailored powder composites with specially distributed pore-grain structure and chemical composition have been presented [83] . ...
Metallic Functionally Graded Materials: A Specific Class of Advanced Composites
Article
Full-text available
  • Apr 2013
  • J MATER SCI TECHNOL
Functionally graded materials, including their characterization, properties and production methods are a new rapidly developing field of materials science. The aims of this review are to systematize the basic production techniques for manufacturing functionally graded materials. Attention is paid to the principles for obtaining graded structure mainly in the metal based functionally graded materials. Several unpublished results obtained by the authors have been discussed briefly. Experimental methods and theoretical analysis for qualitative and quantitative estimation of graded properties have also been presented. The article can be useful for people who work in the field of functionally graded structures and materials, and who need a compact informative review of recent experimental and theoretical activity in this area.
View
... It can be applied to any fine powder in a colloidal suspension, including oxides, carbides, nitrides, metals, and polymers. EPD can produce bulk freestanding parts with a complex shape, can form coatings, and can infiltrate 2D or 3D woven fibres [1][2][3][4][5][6][7][8][9][10]. With EPD, ceramic bodies are shaped directly from a stable colloidal suspension by a DC electric field, which causes the charged particles to move to and deposit on an oppositely charged electrode. ...
Fabrication of Alumina Parts by Electrophoretic Deposition From Ethanol and Aqueous Suspensions
Article
  • May 2009
  • CERAM INT
This paper discusses the effect of the properties of alumina suspensions in ethanol and in water, on green and sintered ceramic parts formed by electrophoretic deposition. The results of the study demonstrate that a small amount of water present in ethanol suspensions as a hidden additive due to the hygroscopicity of alumina powder and ethanol can detrimentally affect the behaviour of the suspension, thus lowering the reliability of the process. Electrophoretic deposition from aqueous suspensions appears to be advantageous over ethanol, from a reliability standpoint, and due to higher achievable green and sintered densities of the deposits and higher deposition rates. Dolapix CE64 appears to be superior surfactant in water as it results in deposits with the lowest green and sintered porosities.
View
Metal Based Functionally Graded Materials
Book
Full-text available
  • Aug 2009
Functionally graded materials, their characterization, properties and production methods are a new rapidly developing field of materials science. From the most informative and widely acceptable opinion, functionally graded materials are characterized by gradual space changes in their composition, structure and, as a result, in their properties. Usually, they are composites in the common sense, but graded structures can be obtained also in traditional, monolithic materials on the basis of a variety of microstructures formed during some kind of material processing. These materials do not contain well distinguished boundaries or interfaces between their different regions as in the case of conventional composite materials. Because of this, such materials posses good chances of reducing mechanical and thermal stress concentration in many structural elements, which can be developed for specific applications. The structure is not simply inhomogeneous, but this inheterogeneity is usually in one direction, typical for the entire volume of a material. The development of instruments for micro- and macrostructure design in functionally graded materials is a challenge for modern industry. On this path, mathematical modeling and numerical simulation are extremely helpful tools for design and investigation of functionally graded materials, which, in fact, are typical representatives of knowledge-based multiphase materials. Jerzy Sobczak / Ludmil Drenchev
View
Fabrication of nanosized 3Y-TZP ceramic dental restoration frameworks on gypsum models by aqueous electrophoretic deposition
Article
  • Feb 2008
The feasibility of using electrophoretic deposition (EPD) as a technique to form nanosized zirconia dental restoration frameworks was evaluated and optimised. By using constant low temperature ultrasonic agitation and magnetic stirring, a 3Y-TZP nanopowder suspension with 75 wt-% solid content was obtained as the EPD starting suspension. High density [80% theoretical density (TD)] nanosized 3Y-TZP green bodies were fabricated by aqueous EPD with an input voltage of 30–40 V. High density (99?9%TD) pure nanosized 3Y-TZP ceramic dental restoration frameworks were successfully achieved after 3 h of sintering at 1280°C. The crystalline structure of the framework was pure tetragonal phase zirconia, and the microstructure was very homogeneous with an average grain size of 230 nm. These results suggest that pure nanozirconia dental restoration frameworks could be near shape manufactured by aqueous EPD.
View
Electrophoretic Deposition for Coatings and Free Standing Objects
Article
Full-text available
  • Feb 2004
A simulation of the electrophoretic deposition process is presented, which allows one to predict the yield of deposition as a function of time for different values of the electrical properties of the liquid and the powders used. It is shown that with special precautions, conditions can be defined where the resistance of the deposit will limit its thickness. Under most conditions however, particularly if a liquid with reasonable electrical conductivity is used, the resistance of the deposit should not limit its growth. Other issues which are of importance in the shaping of free standing objects are also discussed, in particular the electrode shape and electric field distribution, separation of the deposit from the electrode and drying of the object.
View
View
SiC-graphite laminates shaped by EPD
Article
  • Jan 1998
  • AM CERAM SOC BULL
It is possible to manufacture tough, complex-shaped SiC-graphite laminates by EPD.
View
Electrophoretic Deposition Forming of Porous Alumina Membranes
Article
  • Jul 1999
  • ACTA MATER
An electrophoretic deposition (EPD) technique is used to prepare porous alumina membranes. The deposition kinetics which are conventionally derived based on a mass conservation law have been modified in terms of the thickness of the deposited layer. This modification allows the porosity evolution of the membrane to be predicted under a variety of EPD processes. A transition in deposition from linear to parabolic kinetics is observed which has been further verified by a subsequent microstructure examination. The deposited layers are increasingly uniform and dense in structure with increasing deposition time over the parabolic kinetic regime; whilst a more porous packing is observed during the initial deposition time period, corresponding to the linear kinetic regime. The microstructural evolution of the EPD membranes appears to agree well with the porosity equations derived based on an analytical combination of both experimentally-derived formula and the corresponding kinetic model.
View
Homogeneous Functional Ceramic Components through Electrophoretic Deposition from Stable Colloidal Suspensions--I. Basic Concepts and Application to Zirconia
Article
  • Jun 1998
  • J EUR CERAM SOC
Usage of stable suspensions of deagglomerated fine powders is shown to be a prerequisite to take full advantage of the potential of electrophoretic deposition. The method is improved further when starting from suspensions which are additionally sieved through a 20 μm sieve into a ‘cleansed and closed’ deposition apparatus. Smooth zirconia tubes with green dimensions of 110 mm length, 0.5–1.5 mm wall thickness, 34 mm outer diameter have been produced under these conditions. The fired tubes had a characteristic strength of σc = 420 M Pa and Weibull modulus m = 15, as calculated from burst pressure of whole tubes.
View