Microstructural evolution and mechanical properties of Si3N4-SiC (nanoparticle)-Si3N4 (whisker) composites

Young-Hag Koh, Hae Won Kim, Hyoun Ee Kim

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Abstract

The effects of SiC-nanoparticle and Si3N4-whisker additions on the microstructural evolution and mechanical properties of Si3N4 were investigated. The addition of SiC nanoparticles suppressed Si3N4 grain growth, leading to an improvement in the flexural strength. On the other hand, Si3N4 whiskers in the specimen promoted the formation of large elongated grains, which were found to be beneficial to the fracture toughness of the material. When both SiC nanoparticles and Si3N4 whiskers were added concurrently, large grains were formed in fine matrix grains. The microstructure of Si3N4 was controlled by adjusting the relative concentrations of SiC nanoparticles and the Si3N4 whiskers added. These compositional and microstructural variations of the Si3N4 had significant influence on the mechanical properties, such as strength, fracture toughness, R-curve behavior, and high-temperature strength.

Original languageEnglish
Pages (from-to)364-368
Number of pages5
JournalJournal of Materials Research
Volume15
Issue number2
Publication statusPublished - 2000 Feb 1
Externally publishedYes

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ASJC Scopus subject areas

  • Materials Science(all)

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