The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
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Microstructure, Mechanical and Wear Properties of Hot-pressed $Si_3N_4-TiB_2$ Composite

  • Kim, Hyun-Jin (Department of material science and Engineering, SunMoon University, Asan, ChungNam) ;
  • Lee, Soo-Whon (Department of material science and Engineering, SunMoon University, Asan, ChungNam) ;
  • Tadachika Nakayama (ISIR SANKEN, Osaka University) ;
  • Koichi Niihara (ISIR SANKEN, Osaka University)
  • Published : 1999.12.01
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Abstract

$Si_3N_4$-$TiB_2$ with 2 wt% $Al_2O_3$ and 4 wt% $Y_2O_3$ additives was hot pressed in a flowing $N_2$ environment with varying $TiB_2$ content from 10 to 50 vol%. Variations of mechanical (hardness, fracture toughness, and flexual strength), and tribological properties as a function of $TiB_2$ content were investigated. As the content of $TiB_2$ increased, relative density decreased due to the chemical reaction of $TiB_2$in $N_2$ environment. The reduction of density causes mechanical properties to be degraded with an increase of $TiB_2$ in $Si_3N_4$. Tribological properties were dependent of microstructure as well as mechanical properties, however, they were degraded strongly by the chemical reaction of $Si_3N_4$-$TiB_2$ during hot pressing in $N_2$ environment. SEM and TEM observations, and X-ray diffraction analysis that the chemical reaction products at the interface are TiCN, Si, and $SiO_2$. Also, the comparison of XRD patterns of the $Si_3N_4$-40 vol% $TiB_2$ composites hot pressed at $1,750^{\circ}C$ for 1 hour between in $N_2$ and in Ar gas was made. The XRD peaks of Si and $SiO_2$ were not found in Ar, but still a weak peak of TiCN was presented.

Keywords

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