Effect of nano-Al2O3 and Y2O3 on the properties and microstructure of Si3N4

Haitao Gu; Han Chen; Lucun Guo

doi:10.1016/j.msea.2008.01.073

Effect of nano-Al₂O₃ and Y₂O₃ on the properties and microstructure of Si₃N₄

Haitao Gu, Han Chen, Lucun Guo

College of Materials Science and Engineering

Nanjing Tech University

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

9 Scopus citations

Abstract

Nano-Al₂O₃ and Y₂O₃ had a significant effect on the microstructural evolution and mechanical properties of Si₃N₄. With the addition of nano-Al₂O₃, large elongated grains were developed and the grain boundary phase decreased. Besides, the proportion of intergranular fracture increased for nano-Al₂O₃-doped Si₃N₄. The highest fracture toughness of nano-Al₂O₃-doped Si₃N₄ was 9.5 MPa m^1/2 (7.2 MPa m^1/2 for submicro- Al₂O₃-doped Si₃N₄). The increase in mechanical properties might be ascribed to the formation of large elongated grains, the reduction of secondary phases and the "pullout" of elongated grains.

Original language	English
Pages (from-to)	177-181
Number of pages	5
Journal	Materials Science and Engineering: A
Volume	491
Issue number	1-2
DOIs	https://doi.org/10.1016/j.msea.2008.01.073
State	Published - 15 Sep 2008

Keywords

Mechanical properties
Nitrides
Sintering
X-ray diffraction

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10.1016/j.msea.2008.01.073

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abstract = "Nano-Al2O3 and Y2O3 had a significant effect on the microstructural evolution and mechanical properties of Si3N4. With the addition of nano-Al2O3, large elongated grains were developed and the grain boundary phase decreased. Besides, the proportion of intergranular fracture increased for nano-Al2O3-doped Si3N4. The highest fracture toughness of nano-Al2O3-doped Si3N4 was 9.5 MPa m1/2 (7.2 MPa m1/2 for submicro- Al2O3-doped Si3N4). The increase in mechanical properties might be ascribed to the formation of large elongated grains, the reduction of secondary phases and the {"}pullout{"} of elongated grains.",

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T1 - Effect of nano-Al2O3 and Y2O3 on the properties and microstructure of Si3N4

AU - Gu, Haitao

AU - Chen, Han

AU - Guo, Lucun

PY - 2008/9/15

Y1 - 2008/9/15

N2 - Nano-Al2O3 and Y2O3 had a significant effect on the microstructural evolution and mechanical properties of Si3N4. With the addition of nano-Al2O3, large elongated grains were developed and the grain boundary phase decreased. Besides, the proportion of intergranular fracture increased for nano-Al2O3-doped Si3N4. The highest fracture toughness of nano-Al2O3-doped Si3N4 was 9.5 MPa m1/2 (7.2 MPa m1/2 for submicro- Al2O3-doped Si3N4). The increase in mechanical properties might be ascribed to the formation of large elongated grains, the reduction of secondary phases and the "pullout" of elongated grains.

AB - Nano-Al2O3 and Y2O3 had a significant effect on the microstructural evolution and mechanical properties of Si3N4. With the addition of nano-Al2O3, large elongated grains were developed and the grain boundary phase decreased. Besides, the proportion of intergranular fracture increased for nano-Al2O3-doped Si3N4. The highest fracture toughness of nano-Al2O3-doped Si3N4 was 9.5 MPa m1/2 (7.2 MPa m1/2 for submicro- Al2O3-doped Si3N4). The increase in mechanical properties might be ascribed to the formation of large elongated grains, the reduction of secondary phases and the "pullout" of elongated grains.

KW - Mechanical properties

KW - Nitrides

KW - Sintering

KW - X-ray diffraction

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M3 - 文章

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ER -

Effect of nano-Al₂O₃ and Y₂O₃ on the properties and microstructure of Si₃N₄

Abstract

Keywords

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