Crystallographic characterization of silicon nitride ceramics sintered with Y2O3-Al2O3 or E2O3-Al2O3 additions

被引：11

作者：

Santos, C. ^{[1
]}

Ribeiro, S. ^{[1
]}

Strecker, K. ^{[1
]}

Suzuki, P. A. ^{[1
]}

Kycia, S.

Silva, C. R. M.

机构：

[1] Univ Sao Paulo, Escola Engn Lorena, BR-05508 Sao Paulo, Brazil

来源：

CERAMICS INTERNATIONAL | 2009年 / 35卷 / 01期

关键词：

Si3N4; Y3Al5O12; Y2SiO5; X-ray diffraction; Rietveld method; X-RAY; MECHANICAL-PROPERTIES; SI3N4; CERAMICS; SUBSTITUTION; SIALONS; Y2O3;

D O I：

10.1016/j.ceramint.2007.10.014

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Silicon nitride ceramics were sintered using Y2O3-Al2O3 or E2O3-Al2O3 (E2O3 denotes a mixed oxide Of Y2O3 and rare-earth oxides) as sintering additives. The intergranular phases formed after sintering was investigated using high-resolution X-ray diffraction (HRXRD). The use of synchrotron radiation enabled high angular resolution and a high signal to background ratio. Besides the appearance Of beta-Si3N4 phase the intergranular phases Y3Al5O12 (YAG) and Y2SiO5 were identified in both samples. The refinement of the structural parameters by the Rietveld method indicated similar crystalline structure Of beta-Si3N4 for both systems used as sintering additive. On the other hand, the intergranular phases Y3Al5O12 and Y2SiO5 shown a decrease of the lattice parameters, when E2O3 was used as additive, indicating the formation of solid solutions of E3Al5O12 and E2SiO5, respectively. (C) 2007 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：289 / 293

页数：5

共 20 条

[1]

BELLOSI A, 1999, MAT SCI CARBIDES NIT, V68, P285

[2] OXYGEN COORDINATES OF COMPOUNDS WITH GARNET STRUCTURE [J].

EULER, F ;

BRUCE, JA .

ACTA CRYSTALLOGRAPHICA, 1965, 19 :971-&

[3]

German R.M., 1996, Sintering Theory and Practice

[4] CRYSTAL-STRUCTURE OF BETA-SI3N4 - STRUCTURAL AND STABILITY CONSIDERATIONS BETWEEN ALPHA-SI3N4 AND BETA-SI3N4 [J].

GRUN, R .

ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1979, 35 (APR) :800-804

[5] Lu2SiO5 by single-crystal X-ray and neutron diffraction [J].

Gustafsson, T ;

Klintenberg, M ;

Derenzo, SE ;

Weber, MJ ;

Thomas, JO .

ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, 2001, 57 :668-669

[6] SIALONS AND RELATED NITROGEN CERAMICS [J].

JACK, KH .

JOURNAL OF MATERIALS SCIENCE, 1976, 11 (06) :1135-1158

[7]

*JCPDS INT CTR DIF, 1997, PDF FIL

[8]

KELLER K, 1990, CERAM ENG SCI PROC, V11, P1122, DOI 10.1002/9780470313008.ch40

[9] POWDER CELL - A program for the representation and manipulation of crystal structures and calculation of the resulting X-ray powder patterns [J].

Kraus, W ;

Nolze, G .

JOURNAL OF APPLIED CRYSTALLOGRAPHY, 1996, 29 :301-303

[10] MICROSTRUCTURE AND PROPERTIES OF SELF-REINFORCED SILICON-NITRIDE [J].

PYZIK, AJ ;

BEAMAN, DR .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1993, 76 (11) :2737-2744

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