The effect of additives on sintering behavior and strength retention in silicon nitride with RE-disilicate

Z. L. Hong; H. Yoshida; Y. Ikuhara; T. Sakuma; T. Nishimura; M. Mitomo

doi:10.1016/S0955-2219(01)00298-9

The effect of additives on sintering behavior and strength retention in silicon nitride with RE-disilicate

Z. L. Hong, H. Yoshida, Y. Ikuhara, T. Sakuma, T. Nishimura, M. Mitomo

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

64 Citations (Scopus)

Abstract

Four kinds of Si₃N₄-RE₂Si₂O₇ (RE:Nd, Sm, Y, Yb) ceramics have been fabricated by hot pressing at 1725-1750°C for 2 h in N₂ gas flow and post-annealing at 1450°C for 4 h. The effect of rare-earth oxide additions on the densification process was investigated by measuring the shrinkage of the compact. Results revealed that the rare-earth oxides affect the densification process of Si₃N₄-RE₂Si₂O₇ ceramics in which the shrinkage temperature varies with the types of rare-earth additives. The Si-RE-O-N liquid phase formation temperature can be estimated from the onset temperature of final shrinkage stage, and the temperature is in the order of Sm < Nd < Y < Yb. Flexural strength was examined at temperature in a range of 25-1600°C in N₂ gas flow. The high temperature strength of Si₃N₄-Yb₂Si₂O₇ or Si₃N₄-Y₂Si₂O₇ ceramics is better than that of Si₃N₄-Sm₂Si₂O₇ or Si₃N₄-Nd₂Si2O₇ ceramics. There is a roughly linear relation between the strength retention and the liquid phase formation temperature. Present results indicate that Si₃N₄-RE₂Si₂O₇ ceramics with high strength retention can be fabricated by adopting additives with small ionic radius and high ionic charge.

Original language	English
Pages (from-to)	527-534
Number of pages	8
Journal	Journal of the European Ceramic Society
Volume	22
Issue number	4
DOIs	https://doi.org/10.1016/S0955-2219(01)00298-9
Publication status	Published - 2002 Apr

Keywords

Grain boundaries
Hot-pressing
Mechanical properties
SiN
Strength

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1016/S0955-2219(01)00298-9

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@article{e107d1841bc54a719c4c92676aa37b21,

title = "The effect of additives on sintering behavior and strength retention in silicon nitride with RE-disilicate",

abstract = "Four kinds of Si3N4-RE2Si2O7 (RE:Nd, Sm, Y, Yb) ceramics have been fabricated by hot pressing at 1725-1750°C for 2 h in N2 gas flow and post-annealing at 1450°C for 4 h. The effect of rare-earth oxide additions on the densification process was investigated by measuring the shrinkage of the compact. Results revealed that the rare-earth oxides affect the densification process of Si3N4-RE2Si2O7 ceramics in which the shrinkage temperature varies with the types of rare-earth additives. The Si-RE-O-N liquid phase formation temperature can be estimated from the onset temperature of final shrinkage stage, and the temperature is in the order of Sm < Nd < Y < Yb. Flexural strength was examined at temperature in a range of 25-1600°C in N2 gas flow. The high temperature strength of Si3N4-Yb2Si2O7 or Si3N4-Y2Si2O7 ceramics is better than that of Si3N4-Sm2Si2O7 or Si3N4-Nd2Si2O7 ceramics. There is a roughly linear relation between the strength retention and the liquid phase formation temperature. Present results indicate that Si3N4-RE2Si2O7 ceramics with high strength retention can be fabricated by adopting additives with small ionic radius and high ionic charge.",

keywords = "Grain boundaries, Hot-pressing, Mechanical properties, SiN, Strength",

author = "Hong, {Z. L.} and H. Yoshida and Y. Ikuhara and T. Sakuma and T. Nishimura and M. Mitomo",

note = "Funding Information: We wish to express gratitude to the Ministry of Education, Science and Culture, Japan for the financial support by a Grant-in-Aid for Developmental Scientific Research, Grant No. (2)-1045 0254, for Fundamental Science Research. The authors thank N. Hirosaki, H. Tanaka, G.D. Zhan and R.J. Xue for assistance with specimen preparation and flexural strength testing. ",

year = "2002",

month = apr,

doi = "10.1016/S0955-2219(01)00298-9",

language = "English",

volume = "22",

pages = "527--534",

journal = "Journal of the European Ceramic Society",

issn = "0955-2219",

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TY - JOUR

T1 - The effect of additives on sintering behavior and strength retention in silicon nitride with RE-disilicate

AU - Hong, Z. L.

AU - Yoshida, H.

AU - Ikuhara, Y.

AU - Sakuma, T.

AU - Nishimura, T.

AU - Mitomo, M.

N1 - Funding Information: We wish to express gratitude to the Ministry of Education, Science and Culture, Japan for the financial support by a Grant-in-Aid for Developmental Scientific Research, Grant No. (2)-1045 0254, for Fundamental Science Research. The authors thank N. Hirosaki, H. Tanaka, G.D. Zhan and R.J. Xue for assistance with specimen preparation and flexural strength testing.

PY - 2002/4

Y1 - 2002/4

N2 - Four kinds of Si3N4-RE2Si2O7 (RE:Nd, Sm, Y, Yb) ceramics have been fabricated by hot pressing at 1725-1750°C for 2 h in N2 gas flow and post-annealing at 1450°C for 4 h. The effect of rare-earth oxide additions on the densification process was investigated by measuring the shrinkage of the compact. Results revealed that the rare-earth oxides affect the densification process of Si3N4-RE2Si2O7 ceramics in which the shrinkage temperature varies with the types of rare-earth additives. The Si-RE-O-N liquid phase formation temperature can be estimated from the onset temperature of final shrinkage stage, and the temperature is in the order of Sm < Nd < Y < Yb. Flexural strength was examined at temperature in a range of 25-1600°C in N2 gas flow. The high temperature strength of Si3N4-Yb2Si2O7 or Si3N4-Y2Si2O7 ceramics is better than that of Si3N4-Sm2Si2O7 or Si3N4-Nd2Si2O7 ceramics. There is a roughly linear relation between the strength retention and the liquid phase formation temperature. Present results indicate that Si3N4-RE2Si2O7 ceramics with high strength retention can be fabricated by adopting additives with small ionic radius and high ionic charge.

AB - Four kinds of Si3N4-RE2Si2O7 (RE:Nd, Sm, Y, Yb) ceramics have been fabricated by hot pressing at 1725-1750°C for 2 h in N2 gas flow and post-annealing at 1450°C for 4 h. The effect of rare-earth oxide additions on the densification process was investigated by measuring the shrinkage of the compact. Results revealed that the rare-earth oxides affect the densification process of Si3N4-RE2Si2O7 ceramics in which the shrinkage temperature varies with the types of rare-earth additives. The Si-RE-O-N liquid phase formation temperature can be estimated from the onset temperature of final shrinkage stage, and the temperature is in the order of Sm < Nd < Y < Yb. Flexural strength was examined at temperature in a range of 25-1600°C in N2 gas flow. The high temperature strength of Si3N4-Yb2Si2O7 or Si3N4-Y2Si2O7 ceramics is better than that of Si3N4-Sm2Si2O7 or Si3N4-Nd2Si2O7 ceramics. There is a roughly linear relation between the strength retention and the liquid phase formation temperature. Present results indicate that Si3N4-RE2Si2O7 ceramics with high strength retention can be fabricated by adopting additives with small ionic radius and high ionic charge.

KW - Grain boundaries

KW - Hot-pressing

KW - Mechanical properties

KW - SiN

KW - Strength

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DO - 10.1016/S0955-2219(01)00298-9

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VL - 22

SP - 527

EP - 534

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

SN - 0955-2219

IS - 4

ER -

The effect of additives on sintering behavior and strength retention in silicon nitride with RE-disilicate

Abstract

Keywords

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