Porous Materials Process technology and applications

Approximately four million years of human history has passed. We have been using materials to make a variety of tools. The first materials used were naturally occurring materials such as animal bones, stones, wood etc.; and some of these familiar material

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MATERIALS TECHNOLOGY SERIES Series editor: Renee G. Ford

This Materials Technology Series is dedicated to state-of-the-art areas of materials synthesis and processing as related to the applications of the technology. By thorough presentation of the science underlying the technology, it is anticipated that these books will be of practical value both for materials scientists and engineers in industry, and for engineering students, to acquaint them with developments at the forefront of materials technology that have potential commercial significance. Cryochemical Technology of Advanced Materials Yu. D. Tretyakov, N.N. Oleynikov and O.A. Shlyakhtin Hardback (0 412 63980 7), 344 pages

Ceramic Injection Molding B.C. Mutsuddy and R.G. Ford Hardback (0 41253810 5), 384 pages Modelling of Materials Processing An approachable and practical guide G.C. Stangle Hardback (0 412711206), 960 pages

Porous Materials Process technology and applications K.ISHIZAKI Nagaoka University of Technology Japan

S. KOMARNENI The Pennsylvania State University USA

M.NANKO

Tokyo Institute of Technology Japan

SPRINGER-SCIENCE+BUSINESS MEDIA, B.V.

Library of Congress Cataloging-in-Publication Data

ISBN 978-0-412-71110-7 ISBN 978-1-4615-5811-8 (eBook) DOI 10.1007/978-1-4615-5811-8

Printed on acid-free paper

All Rights Reserved © 1998 Springer Science+Business Media Dordrecht Originally published by Kluwer Academic Publishers in 1998 Softcoverreprint ofthe hardcover 1st edition 1998 No part of the material protected by this copyright notice may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording or by any information storage and retrieval system, without written permission from the copyright owner.

Contents

Preface

ix

1 Introduction 1.1 What are porous materials? 1.2 Classification of porous materials

1 1 5

References

2 Powder compacts and green bodies for porous materials 2.1 Sintering as a process for producing porous materials

11 12

12

2.2 The raw powder 2.2.1 Introduction 2.2.2 Powder production methods 2.2.3 Mixing and blending

12 12 16 19

2.3

21 21 23

Green bodies 2.3.1 Introduction 2.3.2 Compaction 2.3.3 Slip casting 2.3.4 Extrusion and injection molding

30

33

2.4 Pore forming agents 2.4.1 Solid pore forming agents 2.4.2 Liquid pore forming agents

34 34 35

References

36

vi

Contents

3 Sintering mechanisms and advanced sintering methods for porous materials 3.1 Theory of sintering for porous materials 3.2 Conventional sintering processes for producing porous materials 3.2.1 Sintering process at low temperatures or for a short time 3.2.2 Vitrification 3.2.3 Reaction sintering 3.2.4 Foams 3.3

Advanced production methods for porous materials 3.3.1 Pulsed electric current sintering for porous materials 3.3.2 Hydrothermal sintering for making porous materials 3.3.3 Hot isostatic pressing for porous materials

References 4 Sol-gel processing, designing porosity, pore size and polarity, and shaping processes 4.1 Introduction 4.1.1 Gels from inorganic s