Paper Title:
The Anisotropic Properties of the Tape Cast Si3N4 Ceramics with Rod-Like β-Si3N4 Seeds Addition
  Abstract

Lu2O3 and SiO2 were used as sintering additives and rod-like β-Si3N4 seeds were added to enhance β-Si3N4 grain unidirectional growth. Silicon nitride ceramics were prepared by tape casting and gas pressure sinteringat 1950oC in 10 atm nitrogen atmosphere for 6 h. Compare to the no-seeded Si3N4, the seeded and tape-cast Si3N4 ceramics have obvious anisotropic microstructure and anisotropic properties. When a stress applied along with the grain alignment direction, the bending strength of the seeded and tape-cast Si3N4 at 1500oC was 738 MPa, which was almost the same as its room temperature bending strength. However, the bending strength of the seeded and tape-cast at room temperature was 556 MPa (perpendicular direction); and their thermal conductivity were 67 W/m·K (perpendicular direction) and 83 W/m·K (parallel direction), respectively. The anisotropic properties of the seeded and tape-cast Si3N4 were attributable to the elongated Si3N4 grain alignment.

  Info
Periodical
Key Engineering Materials (Volumes 317-318)
Edited by
T. Ohji, T. Sekino and K. Niihara
Pages
593-596
DOI
10.4028/www.scientific.net/KEM.317-318.593
Citation
Y. P. Zeng, N. Kondo, K. Hirao, H. Kita, T. Ohji, S. Kanzaki, "The Anisotropic Properties of the Tape Cast Si3N4 Ceramics with Rod-Like β-Si3N4 Seeds Addition", Key Engineering Materials, Vols. 317-318, pp. 593-596, 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: Yan Chun Liu, An Ze Shui, Xue Tan Ren, Ling Ke Zeng
Abstract:Spherical alumina powder and dispersant were mixed with distilled and deionized water, and ball milled to make alumina slurry. The slurry...
293
Authors: Kazuhiko Iwai, Manabu Usui, Shigeo Asai
Abstract:A static magnetic field and an alternating current are imposed on a metallic alloy during solidification for a crystal alignment of the...
563
Authors: Shou Fan Rong, Yong Chang Zhu, Jing Qiang Zhang, Hong Li Liu, Chun Yan Shi
Abstract:Based on the structures and composition of ceramic materials, the microstructure design and new preparations were used to induce in situ...
1899
Authors: Zhi Long Zhao, Zheng Chen, Lin Liu
Abstract:The critical resolved stresses (CRSS) of two kinds of Al-Li alloys 2090 and 2090+Ce in which contained trace addition of cerium are examined....
496
Authors: Zhi Min Zhang, Yong Biao Yang, Ke Ren Xu
Chapter 2: Material Science and its Application
Abstract:Uniaxial tensile tests of extruded 7075 aluminum alloy bar were carried out on the universal test machine at strain rate of 0.001 s-1. The...
500