Effect of SiC volume fraction on mechanical properties and microstructure of $Si_{3}N_{4}/SiC$ nanocomposites

SiC 부피분율이 $Si_{3}N_{4}/SiC$ 초미립복합재료의 기계적 특성과 미세구조에 미치는 영향

  • 황광택 (한양대학교 무기재료공학과) ;
  • 김창삼 (한국과학기술연구원 세라믹스연구부) ;
  • 오근호 (한양대학교 무기재료공학과)
  • Published : 1996.08.01

Abstract

SiC particles (average size is 270 nm) of 0, 10, 20, 30, 40 vol% were dispersed in $Si_{3}N_{4}$, and $Si_{3}N_{4}/SiC$ nanocomposites were fabricated by hot press. After sintering, matrix phase, ${\alpha}-Si_{3}N_{4}$ was transformed to ${\beta}-Si_{3}N_{4}$, and second phase, ${\beta}-SiC$ was not changed. No grain boundary crystalline phase by adding of sintering additives was detected. Grain growth of $Si_{3}N_{4}$ was supressed with increasing of SiC contents, and then fine grain was occurred. The highest fracture strength was obtained at 10 vol% SiC, and fracture toughness was decreased, but hardness was linearly increased with SiC content.

Keywords

References

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