In-situ synthesis and mechanical properties of TiN-Si2N 2O-Si3N4 composites

Hajime Kiyono, Shiro Shimada

研究成果: Article

抄録

Si3N4-Si2N2O-TiN composite ceramics were in-situ fabricated by using following reactions of (1) 3TiO 2 + Si3N4 → 3TiN + 3SiO2 + N2 and (2) Si3N4+ SiO2 → 2Si2N2O. The mixed powder of α-Si3N 4, Al2O3, Y2O3 and TiO2 was hot-pressed at 24 MPa and 1800°-1900°C for 1-4 h in N2. Sintered composite ceramics were characterized by XRD, SEM, TEM, four-point bending test and Vickers indentation method. XRD results and TEM observation showed that TiN and amorphous SiO2 were formed at 1250°C by the reaction (1), and the Si2N2O phase formed by reaction (2) above 1800°C. Si3N4-Si 2N2O-TiN composites consisted of ≥2 μm sized Si 2N2O grains with TiN and Si3N4 grains. Hardness and fracture strength of the composites were comparable to those of Si2N2O ceramics, with fracture toughness being improved at 5vol% TiN containing composites.

元の言語English
ページ(範囲)227-230
ページ数4
ジャーナルKey Engineering Materials
403
DOI
出版物ステータスPublished - 2009
外部発表Yes

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Mechanical properties
Composite materials
Fracture toughness
Transmission electron microscopy
Bending tests
Indentation
Powders
Hardness
silicon nitride
Scanning electron microscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

これを引用

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title = "In-situ synthesis and mechanical properties of TiN-Si2N 2O-Si3N4 composites",
abstract = "Si3N4-Si2N2O-TiN composite ceramics were in-situ fabricated by using following reactions of (1) 3TiO 2 + Si3N4 → 3TiN + 3SiO2 + N2 and (2) Si3N4+ SiO2 → 2Si2N2O. The mixed powder of α-Si3N 4, Al2O3, Y2O3 and TiO2 was hot-pressed at 24 MPa and 1800°-1900°C for 1-4 h in N2. Sintered composite ceramics were characterized by XRD, SEM, TEM, four-point bending test and Vickers indentation method. XRD results and TEM observation showed that TiN and amorphous SiO2 were formed at 1250°C by the reaction (1), and the Si2N2O phase formed by reaction (2) above 1800°C. Si3N4-Si 2N2O-TiN composites consisted of ≥2 μm sized Si 2N2O grains with TiN and Si3N4 grains. Hardness and fracture strength of the composites were comparable to those of Si2N2O ceramics, with fracture toughness being improved at 5vol{\%} TiN containing composites.",
keywords = "Composites, Mechanical properties, Reaction sintering, Silicon nitride, Silicon oxynitride, Titanium nitride",
author = "Hajime Kiyono and Shiro Shimada",
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AU - Kiyono, Hajime

AU - Shimada, Shiro

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AB - Si3N4-Si2N2O-TiN composite ceramics were in-situ fabricated by using following reactions of (1) 3TiO 2 + Si3N4 → 3TiN + 3SiO2 + N2 and (2) Si3N4+ SiO2 → 2Si2N2O. The mixed powder of α-Si3N 4, Al2O3, Y2O3 and TiO2 was hot-pressed at 24 MPa and 1800°-1900°C for 1-4 h in N2. Sintered composite ceramics were characterized by XRD, SEM, TEM, four-point bending test and Vickers indentation method. XRD results and TEM observation showed that TiN and amorphous SiO2 were formed at 1250°C by the reaction (1), and the Si2N2O phase formed by reaction (2) above 1800°C. Si3N4-Si 2N2O-TiN composites consisted of ≥2 μm sized Si 2N2O grains with TiN and Si3N4 grains. Hardness and fracture strength of the composites were comparable to those of Si2N2O ceramics, with fracture toughness being improved at 5vol% TiN containing composites.

KW - Composites

KW - Mechanical properties

KW - Reaction sintering

KW - Silicon nitride

KW - Silicon oxynitride

KW - Titanium nitride

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