Mechanical properties of transparent polycrystalline silicon nitride

Rak Joo Sung; Takafumi Kusunose; Tadachika Nakayama; Yoon Ho Kim; Tohru Sekino; Soowohn Lee; Koichi Niihara

Mechanical properties of transparent polycrystalline silicon nitride

Rak Joo Sung, Takafumi Kusunose, Tadachika Nakayama, Yoon Ho Kim, Tohru Sekino, Soowohn Lee, Koichi Niihara

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

Abstract

A novel transparent polycrystalline silicon nitride was fabricated by hot-press sintering with MgO and AlN as additives. The mixed powder with 3 wt.% MgO and 9 wt.% AlN was sintered at 1900°C for 1 hour under 30 MPa pressure in a nitrogen gas atmosphere. Transparent polycrystalline silicon nitride was successfully fabricated. The mechanical properties such as density, hardness, young's modulus, fracture strength and fracture toughness were evaluated. The effect of α/β phase on the mechanical properties of transparent polycrystalline silicon nitride was investigated. The properties were changed depending on the amount of α/β phase. The hardness and Young's modulus increased with increasing the volume fraction of α-phase fraction as a reflection of the higher hardness of α-phase Si₃N ₄. The fracture toughness and fracture strength decreased with decreasing the volume fraction of β-phase Si₃N₄.

Original language	English
Pages (from-to)	305-308
Number of pages	4
Journal	Key Engineering Materials
Volume	317-318
Publication status	Published - 2006 Jan 1
Externally published	Yes

Keywords

AlN
Hot-press
Silicon nitride
Transparent

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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title = "Mechanical properties of transparent polycrystalline silicon nitride",

abstract = "A novel transparent polycrystalline silicon nitride was fabricated by hot-press sintering with MgO and AlN as additives. The mixed powder with 3 wt.% MgO and 9 wt.% AlN was sintered at 1900°C for 1 hour under 30 MPa pressure in a nitrogen gas atmosphere. Transparent polycrystalline silicon nitride was successfully fabricated. The mechanical properties such as density, hardness, young's modulus, fracture strength and fracture toughness were evaluated. The effect of α/β phase on the mechanical properties of transparent polycrystalline silicon nitride was investigated. The properties were changed depending on the amount of α/β phase. The hardness and Young's modulus increased with increasing the volume fraction of α-phase fraction as a reflection of the higher hardness of α-phase Si3N 4. The fracture toughness and fracture strength decreased with decreasing the volume fraction of β-phase Si3N4.",

keywords = "AlN, Hot-press, Silicon nitride, Transparent",

author = "Sung, {Rak Joo} and Takafumi Kusunose and Tadachika Nakayama and Kim, {Yoon Ho} and Tohru Sekino and Soowohn Lee and Koichi Niihara",

year = "2006",

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pages = "305--308",

journal = "Key Engineering Materials",

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T1 - Mechanical properties of transparent polycrystalline silicon nitride

AU - Sung, Rak Joo

AU - Kusunose, Takafumi

AU - Nakayama, Tadachika

AU - Kim, Yoon Ho

AU - Sekino, Tohru

AU - Lee, Soowohn

AU - Niihara, Koichi

PY - 2006/1/1

Y1 - 2006/1/1

N2 - A novel transparent polycrystalline silicon nitride was fabricated by hot-press sintering with MgO and AlN as additives. The mixed powder with 3 wt.% MgO and 9 wt.% AlN was sintered at 1900°C for 1 hour under 30 MPa pressure in a nitrogen gas atmosphere. Transparent polycrystalline silicon nitride was successfully fabricated. The mechanical properties such as density, hardness, young's modulus, fracture strength and fracture toughness were evaluated. The effect of α/β phase on the mechanical properties of transparent polycrystalline silicon nitride was investigated. The properties were changed depending on the amount of α/β phase. The hardness and Young's modulus increased with increasing the volume fraction of α-phase fraction as a reflection of the higher hardness of α-phase Si3N 4. The fracture toughness and fracture strength decreased with decreasing the volume fraction of β-phase Si3N4.

AB - A novel transparent polycrystalline silicon nitride was fabricated by hot-press sintering with MgO and AlN as additives. The mixed powder with 3 wt.% MgO and 9 wt.% AlN was sintered at 1900°C for 1 hour under 30 MPa pressure in a nitrogen gas atmosphere. Transparent polycrystalline silicon nitride was successfully fabricated. The mechanical properties such as density, hardness, young's modulus, fracture strength and fracture toughness were evaluated. The effect of α/β phase on the mechanical properties of transparent polycrystalline silicon nitride was investigated. The properties were changed depending on the amount of α/β phase. The hardness and Young's modulus increased with increasing the volume fraction of α-phase fraction as a reflection of the higher hardness of α-phase Si3N 4. The fracture toughness and fracture strength decreased with decreasing the volume fraction of β-phase Si3N4.

KW - AlN

KW - Hot-press

KW - Silicon nitride

KW - Transparent

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