Preparation and mechanical properties of self-reinforced in situ Si3N4 composite with La2O3 and Y2O3 additives

Y. Xu; L. Cheng; L. Zhang; X. Luo; W. Zhou

doi:10.1016/S1359-835X(99)00013-5

Preparation and mechanical properties of self-reinforced in situ Si₃N₄ composite with La₂O₃ and Y₂O₃ additives

Y. Xu, L. Cheng, L. Zhang, X. Luo, W. Zhou

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

6 Scopus citations

Abstract

Self-reinforced in situ Si₃N₄ composite material was prepared with high amount of La₂O₃ and Y₂O₃ additives by two-step hot pressing, and the optimum amount of additives was determined. The volume fraction of boundary glass phase was calculated based on the equilibrium of equivalent number in chemical reaction. For material with 15 mol% additives, flexural strength and fracture toughness at room temperature were 960 MPa and 12.3 MPa m^1/2, respectively. At temperature of 1350°C, flexural strength was maintained to 720 MPa and fracture toughness was significantly increased to 23.9 MPa m^1/2 because of the high refractory of oxynitride glass containing compositions of La and Y. Self-reinforced mechanism was mainly responsible for crack deflection along the elongated β-Si₃N₄ grains.

Original language	English
Pages (from-to)	945-950
Number of pages	6
Journal	Composites Part A: Applied Science and Manufacturing
Volume	30
Issue number	8
DOIs	https://doi.org/10.1016/S1359-835X(99)00013-5
State	Published - Aug 1999

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title = "Preparation and mechanical properties of self-reinforced in situ Si3N4 composite with La2O3 and Y2O3 additives",

abstract = "Self-reinforced in situ Si3N4 composite material was prepared with high amount of La2O3 and Y2O3 additives by two-step hot pressing, and the optimum amount of additives was determined. The volume fraction of boundary glass phase was calculated based on the equilibrium of equivalent number in chemical reaction. For material with 15 mol% additives, flexural strength and fracture toughness at room temperature were 960 MPa and 12.3 MPa m 1/2 , respectively. At temperature of 1350°C, flexural strength was maintained to 720 MPa and fracture toughness was significantly increased to 23.9 MPa m 1/2 because of the high refractory of oxynitride glass containing compositions of La and Y. Self-reinforced mechanism was mainly responsible for crack deflection along the elongated β-Si3N4 grains.",

author = "Y. Xu and L. Cheng and L. Zhang and X. Luo and W. Zhou",

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T1 - Preparation and mechanical properties of self-reinforced in situ Si3N4 composite with La2O3 and Y2O3 additives

AU - Xu, Y.

AU - Cheng, L.

AU - Zhang, L.

AU - Luo, X.

AU - Zhou, W.

PY - 1999/8

Y1 - 1999/8

N2 - Self-reinforced in situ Si3N4 composite material was prepared with high amount of La2O3 and Y2O3 additives by two-step hot pressing, and the optimum amount of additives was determined. The volume fraction of boundary glass phase was calculated based on the equilibrium of equivalent number in chemical reaction. For material with 15 mol% additives, flexural strength and fracture toughness at room temperature were 960 MPa and 12.3 MPa m 1/2 , respectively. At temperature of 1350°C, flexural strength was maintained to 720 MPa and fracture toughness was significantly increased to 23.9 MPa m 1/2 because of the high refractory of oxynitride glass containing compositions of La and Y. Self-reinforced mechanism was mainly responsible for crack deflection along the elongated β-Si3N4 grains.

AB - Self-reinforced in situ Si3N4 composite material was prepared with high amount of La2O3 and Y2O3 additives by two-step hot pressing, and the optimum amount of additives was determined. The volume fraction of boundary glass phase was calculated based on the equilibrium of equivalent number in chemical reaction. For material with 15 mol% additives, flexural strength and fracture toughness at room temperature were 960 MPa and 12.3 MPa m 1/2 , respectively. At temperature of 1350°C, flexural strength was maintained to 720 MPa and fracture toughness was significantly increased to 23.9 MPa m 1/2 because of the high refractory of oxynitride glass containing compositions of La and Y. Self-reinforced mechanism was mainly responsible for crack deflection along the elongated β-Si3N4 grains.

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U2 - 10.1016/S1359-835X(99)00013-5

DO - 10.1016/S1359-835X(99)00013-5

M3 - 文章

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JF - Composites Part A: Applied Science and Manufacturing

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Preparation and mechanical properties of self-reinforced in situ Si₃N₄ composite with La₂O₃ and Y₂O₃ additives

Abstract

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