Microstructure of a sialon composite prepared by hot pressing and reactive sintering of β-Si3N4 coated with amorphous Al2O3

G. Ghosh; S. Vaynman; M. E. Fine

doi:10.1016/S0272-8842(98)00079-0

Microstructure of a sialon composite prepared by hot pressing and reactive sintering of β-Si₃N₄ coated with amorphous Al₂O₃

G. Ghosh^*, S. Vaynman, M. E. Fine

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

A composite microstructure, consisting of β-sialon, O-sialon and X-sialon phases, was produced by coating β-Si₃N₄ particles with amorphous alumina followed by hot pressing and reactive sintering at 1923 K. The microstructure, chemistry of the phases and interphase interfaces of this ceramic were characterized by TEM and high resolution AEM. Both polyhedral and elongated β-sialon grains were observed. TEM examination showed the formation of a large number of β-sialon grains and PEELS and EDS X-ray microanalysts in AEM revealed they had varing amounts of aluminum and oxygen contents. HREM examination of several interphase interfaces and triple junctions suggests that the amount of glassy phase in the produced ceramic is substantially lower compared to those reported in the literature. This is of importance for high temperature properties.

Original language	English (US)
Pages (from-to)	649-659
Number of pages	11
Journal	Ceramics International
Volume	25
Issue number	7
DOIs	https://doi.org/10.1016/S0272-8842(98)00079-0
State	Published - Sep 1999
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

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@article{8f335e1f1c494d23825786e25ac22fff,

title = "Microstructure of a sialon composite prepared by hot pressing and reactive sintering of β-Si3N4 coated with amorphous Al2O3",

abstract = "A composite microstructure, consisting of β-sialon, O-sialon and X-sialon phases, was produced by coating β-Si3N4 particles with amorphous alumina followed by hot pressing and reactive sintering at 1923 K. The microstructure, chemistry of the phases and interphase interfaces of this ceramic were characterized by TEM and high resolution AEM. Both polyhedral and elongated β-sialon grains were observed. TEM examination showed the formation of a large number of β-sialon grains and PEELS and EDS X-ray microanalysts in AEM revealed they had varing amounts of aluminum and oxygen contents. HREM examination of several interphase interfaces and triple junctions suggests that the amount of glassy phase in the produced ceramic is substantially lower compared to those reported in the literature. This is of importance for high temperature properties.",

author = "G. Ghosh and S. Vaynman and Fine, {M. E.}",

note = "Funding Information: This work was financially supported by the National Science Foundation under a Small Grant for Exploratory Research (Grant# 92-23584). One of us (G.G.) would like to thank Dr. Lucia Dumitreseu of Royal Institute of Technology, Stockholm, for her help in the calculation of Si–Al–O–N phase diagrams.",

year = "1999",

month = sep,

doi = "10.1016/S0272-8842(98)00079-0",

language = "English (US)",

volume = "25",

pages = "649--659",

journal = "Ceramics International",

issn = "0272-8842",

publisher = "Elsevier Ltd",

number = "7",

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TY - JOUR

T1 - Microstructure of a sialon composite prepared by hot pressing and reactive sintering of β-Si3N4 coated with amorphous Al2O3

AU - Ghosh, G.

AU - Vaynman, S.

AU - Fine, M. E.

N1 - Funding Information: This work was financially supported by the National Science Foundation under a Small Grant for Exploratory Research (Grant# 92-23584). One of us (G.G.) would like to thank Dr. Lucia Dumitreseu of Royal Institute of Technology, Stockholm, for her help in the calculation of Si–Al–O–N phase diagrams.

PY - 1999/9

Y1 - 1999/9

N2 - A composite microstructure, consisting of β-sialon, O-sialon and X-sialon phases, was produced by coating β-Si3N4 particles with amorphous alumina followed by hot pressing and reactive sintering at 1923 K. The microstructure, chemistry of the phases and interphase interfaces of this ceramic were characterized by TEM and high resolution AEM. Both polyhedral and elongated β-sialon grains were observed. TEM examination showed the formation of a large number of β-sialon grains and PEELS and EDS X-ray microanalysts in AEM revealed they had varing amounts of aluminum and oxygen contents. HREM examination of several interphase interfaces and triple junctions suggests that the amount of glassy phase in the produced ceramic is substantially lower compared to those reported in the literature. This is of importance for high temperature properties.

AB - A composite microstructure, consisting of β-sialon, O-sialon and X-sialon phases, was produced by coating β-Si3N4 particles with amorphous alumina followed by hot pressing and reactive sintering at 1923 K. The microstructure, chemistry of the phases and interphase interfaces of this ceramic were characterized by TEM and high resolution AEM. Both polyhedral and elongated β-sialon grains were observed. TEM examination showed the formation of a large number of β-sialon grains and PEELS and EDS X-ray microanalysts in AEM revealed they had varing amounts of aluminum and oxygen contents. HREM examination of several interphase interfaces and triple junctions suggests that the amount of glassy phase in the produced ceramic is substantially lower compared to those reported in the literature. This is of importance for high temperature properties.

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U2 - 10.1016/S0272-8842(98)00079-0

DO - 10.1016/S0272-8842(98)00079-0

M3 - Article

AN - SCOPUS:0033321981

SN - 0272-8842

VL - 25

SP - 649

EP - 659

JO - Ceramics International

JF - Ceramics International

IS - 7

ER -

Microstructure of a sialon composite prepared by hot pressing and reactive sintering of β-Si₃N₄ coated with amorphous Al₂O₃

Abstract

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