Paper Title:
High-Temperature Properties of Silicon Nitride with Lu-Si-O-N Grain Boundary Phases
  Abstract

High-temperature properties of silicon nitride ceramics with Lu-silicon-oxynitride grain boundary phases were investigated. Si3N4 powder with 1.2 mol% (SN12) and 4.8 mol% (SN48) of Lu2O3 were gas-pressure hot-pressed at 1950°C for 2 h under 20 MPa in 1 MPa N2. SN12 consisted of elongated β-Si3N4 and a secondary phase, Lu4Si2O7N2, whilst SN48 consisted of elongated β-Si3N4 and Lu4Si2O7N2 + Lu2SiO5. At 1500°C and 1600°C, the stress-strain curve of SN48 was nonlinear, whilst that of SN12 was linear, indicating that SN12 broke as a brittle fracture at these temperatures. SN12 had excellent oxidation resistance and weight gain during the oxidation at 1500°C for 1000 h was 4 g/m2. Creep lifetime of SN12 at 1500°C under tensile stress of 137 MPa exceeded 1678.5 h.

  Info
Periodical
Key Engineering Materials (Volumes 317-318)
Edited by
T. Ohji, T. Sekino and K. Niihara
Pages
425-428
DOI
10.4028/www.scientific.net/KEM.317-318.425
Citation
Y. Yamamoto, T. Nishimura, N. Hirosaki, S. Guo, J. Cao, M. Mitomo, "High-Temperature Properties of Silicon Nitride with Lu-Si-O-N Grain Boundary Phases", Key Engineering Materials, Vols. 317-318, pp. 425-428, 2006
Online since
August 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Jian Feng Yang, Yoshihisa Beppu, Tatsuki Ohji
233
Authors: Yong Huang, Shi Ke Zhao, Cui Wei Li, Chang An Wang, Qing Feng Zan
15
Authors: Dae Ho Choi, Byung Kyu Moon, Rak Joo Sung, Seung Ho Kim, Koichi Niihara
Abstract:Mechanical and thermal properties of Si3N4 ceramics with various rare-earth oxides (La2O3, CeO2, Lu2O3, Dy2O3, Sm2O3, Nd2O3, Yb2O3, and...
181
Authors: Jian Feng Tong, Da Ming Cheng, Bao Wei Li, Huang Hao Ling, Wang Ling
Abstract:The influence of Lu2O3 on phase transformation and seeds morphology was investigated. The result showed that the β-Si3N4 seeds with up to 95%...
37
Authors: Bao Xia Ma, Wen Bo Han, Xing Hong Zhang
Abstract:Ternary ZrC-SiC-ZrB2 ceramic composites were prepared by hot pressing at 1900 °C for 60 min under a pressure of 30 MPa in argon. The...
173