Paper Title:
Fracture Toughness of Liquid Phase Sintered SiC by Using Indentation Fracture Method
  Abstract

SiC materials have excellent high temperature strength, low coefficient of thermal expansion, good resistance to oxidation and good thermal and chemical stability etc. However, the brittle characteristics of SiC such as low fracture toughness and low strain-to fracture still impose a severe limitation on practical applications of SiC materials. Therefore, in the interests of safety, we are required to measure fracture toughness of materials. In the present work, monolithic Liquid Phase Sintered SiC (LPS-SiC) was fabricated by hot pressing method under 20MPa using sintering additives at different temperature such as 1760oC, 1780oC, 1800oC and 1820oC. The starting powder was high purity β-SiC nano-powder with an average particle size of 30nm. Compositions of sintering additives were Al2O3 / Y2O3 = 0.7 and 1.5 (wt. %). Monolithic LPS-SiC was evaluated in terms of sintering density, hardness and fracture toughness through indentation fracture method by the Vickers hardness tester. Sintered density, hardness and fracture toughness of fabricated LPS-SiC increased with the increase of sintering temperature. They are higher than those of fabricated SiC by the chemical vapor deposition method.

  Info
Periodical
Key Engineering Materials (Volumes 297-300)
Edited by
Young-Jin Kim, Dong-Ho Bae and Yun-Jae Kim
Pages
137-142
DOI
10.4028/www.scientific.net/KEM.297-300.137
Citation
H. C. Jung, H. K. Yoon, B. A. Kim, J. S. Park, A. Kohyama, "Fracture Toughness of Liquid Phase Sintered SiC by Using Indentation Fracture Method", Key Engineering Materials, Vols. 297-300, pp. 137-142, 2005
Online since
November 2005
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: Han Ki Yoon, Yi Hyun Park, Joon Soo Park, Akira Kohyama
Abstract:SiC has been extensively studied for high temperature components in advanced energy system and gas turbine because of its excellent high...
2539
Authors: Han Ki Yoon, Young Ju Lee, Yi Hyun Park, Joon Soo Park, Akira Kohyama
Abstract:Nano infiltration transient eutectic ceramic (NITE-SiC) was fabricated by hot pressing method using Al2O3 and Y2O3 as sintering additives....
699
Authors: Kai Li Lin, Lei Chen, Jiang Chang, Jian Xi Lu
Abstract:In the present study, Ca2P2O7-doped β-Ca3(PO4)2 bioceramics were fabricated by pressureless sintering process. The effect of Ca2P2O7 on the...
23
Authors: Yusuf Çelik, Gültekin Göller, Yücel Onüralp, Filiz Çinar Şahin
Abstract:The aim of this study was to produce dense and mechanically strong boron carbide ceramics with the help of different oxide additives....
79
Authors: Yoshihiro Hirata, Naoki Matsunaga, Soichiro Sameshima
Abstract:This paper reports the influence of sintering additives (RE2O3, Al2O3RE2O3, RE = Yb, Y and Gd, 13 vol%) and mixing effect of 30 nm SiC...
124