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Title: Formation and characteristics of silicon nitride-lithium aluminum silicate ceramics: I. Sintering and microstructure

Abstract

Silicon nitride ceramics with the grain-boundary phase {beta}-eucryptite, LiAlSiO{sub 4}, or {beta}-spodumene, LiAlSi{sub 2}O{sub 6}, were produced by pressureless sintering {alpha}-Si{sub 3}N{sub 4}, SiO{sub 2}, and LiAlO{sub 2} powder mixtures at 1,300{degree} to 1,900{degree}C. The phase relations in the system Si{sub 3}N{sub 4}-LiAlO{sub 2}-SiO{sub 2} were investigated at 1,500{degree}C, showing the presence of an Si-Li-O rich liquid phase. During annealing at 900{degree} to 1,300{degree}C, {beta}-eucryptite precipitated when the sintering temperature was <1,700{degree}C, whereas {beta}-spodumene crystallized when it was >1,700{degree}C. Because of the low thermal expansion of {beta}-LiAlSiO{sub 4} and {beta}-LiAlSi{sub 2}O{sub 6} ({minus}6.3 {times} 10{sup {minus}7}{degree}C{sup {minus}1} and 8.3 {times} 10{sup {minus}7}{degree}C{sup {minus}1}, RT = 1,000{degree}C), thermal-induced misfit stresses will be developed. Because of these stresses, toughening effects can be expected in the composite microstructures.

Authors:
; ;  [1]
  1. Max-Planck-Institut fuer Metallforschung, Stuttgart (West Germany)
Publication Date:
OSTI Identifier:
6073860
Resource Type:
Journal Article
Journal Name:
Advanced Ceramic Materials; (USA)
Additional Journal Information:
Journal Volume: 2:4; Journal ID: ISSN 0883-5551
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM SILICATES; MICROSTRUCTURE; SINTERING; LITHIUM SILICATES; SILICON NITRIDES; EXPERIMENTAL DATA; GRAIN BOUNDARIES; PHASE STUDIES; THERMAL EXPANSION; VERY HIGH TEMPERATURE; ALKALI METAL COMPOUNDS; ALUMINIUM COMPOUNDS; CRYSTAL STRUCTURE; DATA; EXPANSION; FABRICATION; INFORMATION; LITHIUM COMPOUNDS; NITRIDES; NITROGEN COMPOUNDS; NUMERICAL DATA; OXYGEN COMPOUNDS; PNICTIDES; SILICATES; SILICON COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication; 360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies

Citation Formats

Kim, D J, Greil, P, and Petzow, G. Formation and characteristics of silicon nitride-lithium aluminum silicate ceramics: I. Sintering and microstructure. United States: N. p., 1987. Web. doi:10.1111/j.1551-2916.1987.tb00154.x.
Kim, D J, Greil, P, & Petzow, G. Formation and characteristics of silicon nitride-lithium aluminum silicate ceramics: I. Sintering and microstructure. United States. https://doi.org/10.1111/j.1551-2916.1987.tb00154.x
Kim, D J, Greil, P, and Petzow, G. 1987. "Formation and characteristics of silicon nitride-lithium aluminum silicate ceramics: I. Sintering and microstructure". United States. https://doi.org/10.1111/j.1551-2916.1987.tb00154.x.
@article{osti_6073860,
title = {Formation and characteristics of silicon nitride-lithium aluminum silicate ceramics: I. Sintering and microstructure},
author = {Kim, D J and Greil, P and Petzow, G},
abstractNote = {Silicon nitride ceramics with the grain-boundary phase {beta}-eucryptite, LiAlSiO{sub 4}, or {beta}-spodumene, LiAlSi{sub 2}O{sub 6}, were produced by pressureless sintering {alpha}-Si{sub 3}N{sub 4}, SiO{sub 2}, and LiAlO{sub 2} powder mixtures at 1,300{degree} to 1,900{degree}C. The phase relations in the system Si{sub 3}N{sub 4}-LiAlO{sub 2}-SiO{sub 2} were investigated at 1,500{degree}C, showing the presence of an Si-Li-O rich liquid phase. During annealing at 900{degree} to 1,300{degree}C, {beta}-eucryptite precipitated when the sintering temperature was <1,700{degree}C, whereas {beta}-spodumene crystallized when it was >1,700{degree}C. Because of the low thermal expansion of {beta}-LiAlSiO{sub 4} and {beta}-LiAlSi{sub 2}O{sub 6} ({minus}6.3 {times} 10{sup {minus}7}{degree}C{sup {minus}1} and 8.3 {times} 10{sup {minus}7}{degree}C{sup {minus}1}, RT = 1,000{degree}C), thermal-induced misfit stresses will be developed. Because of these stresses, toughening effects can be expected in the composite microstructures.},
doi = {10.1111/j.1551-2916.1987.tb00154.x},
url = {https://www.osti.gov/biblio/6073860}, journal = {Advanced Ceramic Materials; (USA)},
issn = {0883-5551},
number = ,
volume = 2:4,
place = {United States},
year = {Thu Oct 01 00:00:00 EDT 1987},
month = {Thu Oct 01 00:00:00 EDT 1987}
}