ChemInform Abstract: IMPURITY PHASES IN HOT‐PRESSED SILICON NITRIDE

Lou, L. K. V.; Mitchell, T. E.; Heuer, A. H.

doi:10.1002/chin.197852005

Cited by 2 publications

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“…However, silicon nitride is a The use of liquid phase sintering balances the easier processing against the potential for degraded high temperature properties. The liquid forms a wetting film along the grain boundaries and appears as a glass phase in some of the compositions (100,102). Although this phase aids densification and helps avoid decomposition of the silicon nitride, it also dtctates the high temperature properties (103,98).…”

Section: E Silicon Nitride Systemsmentioning

confidence: 99%

Liquid Phase Sintering

German¹

1985

557

100

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Originally published by Plenum Press New York in 1985.Softcover reprint of the hardcover 1st edition 1985 All rights reserved No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording, or otherwise, without written permission from the Publisher Dedicated to PROFESSOR FRITZ V. LENEL a pioneer in the field of liquid phase sintering FOREWORDIn the past few years there has been rapid growth in the activities involving particulate materials because of recognized advantages in manufacturing. This growth is attributed to several factors; i) an increased concern over energy utilization, ii) a desire to better control microstructure in engineermg materials, iii) the need for 1mproved material economy, iv) societal and economic pressures for higher productivity and quality, v) requirements for unique property combinations for high performance applications, and vi) a desire for net shape forming. Accordingly, liquid phase sintering has received increased attention as part of the growth in particulate materials processing. As a consequence, the commercial applications for liquid phase sintering are expanding rapidly. This active and expanding interest is not well served by available texts. For this reason I felt it was appropriate to write this book on liquid phase sintering.The technology of liquid phase sintering IS quite old and has been in use in the ceramics industry for many centuries. However, the general perception among materials and manufacturing engineers is that liquid phase sintering is still a novel technique. I believe the diverse technological applications outlined in this book will dispel I such impressions. Liquid phase. sintering has great value in fabricating several unique materials to near net shapes and will continue to expand in applications as the fundamental attributes are better appreciated.I am personally involved with several uses for liquid phase sintering. My initial exposure was with refractory metals and alloys like the heavy alloys based on high tungsten contents. My subsequent studies have included ferrous structural alloys, aluminum alloys, cemented carb1des, molybdenum, metal-ceramic composites, alumina, and several high performance ceramics processed by liquid phase sintering. Obviously, my early emphasis on the metallic examples of liquid phase sintermg are carried into this book; however, I have made an effort to include several examples of nonmetallic materials.In writing the book, my goal was to organize the current knowledge on liquid phase sintering into a general, material independent treatment. The primary emphasis is on the fundamentals and the universal characteristics of liquid phase sintering. Through an understanding of the fundamentals, the technology for manufacturing by liquid phase sintering becomes evident. The book is written for the technical audience interested in liquid phase sintering, including manufacturing and materials engineers, graduate stude...

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Section: E Silicon Nitride Systemsmentioning

confidence: 99%

Liquid Phase Sintering

German¹

1985

557

100

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“…Sendo o método mais económico de sinterização, o SSN, densifica pós compactados com aditivos a pressões abaixo de 0,1 MPa, com atmosfera de N2 a uma temperatura que varia entre 1700 °C e 1800 °C. Os pós de partida (Si3N4 mais aditivos) podem ser compactados em diversos formatos e por vários métodos de modelagem (114) .…”

Section: Sinterização Sem Aplicação De Pressão (Ssn)unclassified

“…Nesse método, os aditivos mais utilizados são: MgO, AI2O3, SiO2, Y2O3, CeO2 e La2O3 entre outros. Durante o processo de sinterização os aditivos reagem com o SiO2 presente na superfície das partículas do Si3N4 e promovem a densificação via fase líquida (113)(114)(115) , porém, para que o material atinja completa densificação no processo de sinterização via fase líquida, três princípios (116) como alto vácuo (menor 10 -6 torr), temperaturas extremas (+230 a -150 °C), além de grandes diferenciais de temperatura ao longo de uma longa vida útil (110) .…”

Section: Sinterização Sem Aplicação De Pressão (Ssn)unclassified

“…Na maioria dos casos, o valor é administrado por via oral em concentrações que variam entre 100 e 767 mg de Sr/kg/dia. Estudos anteriores (113,114) demonstraram que, em uma dose baixa,o estrôncio dificulta a atividade dos osteoclastos e favorece a proliferação de células osteoblásticas (155) , ou seja, age sinergicamente contra a reabsorção óssea e, por outro lado, age aumentando o número de locais de formação óssea.…”

Section: Estrôncio (Sr)unclassified

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Cerâmicas de nitreto de silício contendo óxidos de silício, estrôncio e alumínio para substituições ósseas

Nascimento¹

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ChemInform Abstract: IMPURITY PHASES IN HOT‐PRESSED SILICON NITRIDE

Abstract: Wie elektronenmikroskopische Untersuchungen zeigen, liegen in handelsüblichem heißgepreßtem Si3N4 neben der dominierenden β‐Si3N4‐Phase kleine Mengen an Si2N2O, SiC und WC vor.

Cited by 2 publications

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Liquid Phase Sintering

Liquid Phase Sintering

Cerâmicas de nitreto de silício contendo óxidos de silício, estrôncio e alumínio para substituições ósseas

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