Rod-like Si 3N 4 grain growth in the sintered body of amorphous Si 3N 4-BN composite powder with sintering additives

Hironori Kugimoto, Masato Uehara, Naoya Enomoto, Junichi Hojo

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The sintered structures of amorphous Si 3N 4-BN composite powder were investigated with sintering aids from the Y 2O 3-Al 2O 3 and Y 2O 3-TiO 2-AlN systems. In the Y 2O 3-Al 2O 3 system, β-Si 3N 4 and h-BN crystallized during sintering. TiN additionally appeared in the Y 2O 3-TiO 2-AlN system. The microstructure of the Si 3N 4-BN composite was observed by SEM. Flaky BN particles with a length of about 1.0-1.5 μm were observed in the Si 3N 4 matrix. The Si 3N 4 matrix had a fine-grained microstructure in the Y 2O 3-Al 2O 3 system, whereas rod-like Si 3N 4 grains with a length of 3-10 μm were observed in the Y 2O 3-TiO 2-AlN system. The morphology of the TiN particles was observed by TEM. Small TiN particles of about 0.1 μm in diameter were included in large Si 3N 4 grains, but these fine TiN inclusions were a rare case. Large TiN particles of about 1 μm in diameter were located at grain boundaries throughout the sintered body. The thermal shock resistance of Si 3N 4 was improved by the BN inclusions in the Y 2O 3-Al 2O 3 system. With the Y 2O 3-TiO 2-AlN system, the TiN inclusions increased the fracture toughness of the Si 3N 4-BN composite but the thermal shock resistance was reduced.

Original languageEnglish
Pages (from-to)6-9
Number of pages4
JournalJournal of Ceramic Processing Research
Volume4
Issue number1
Publication statusPublished - 2003

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Grain growth
Powders
Sintering
Thermal shock
Composite materials
Microstructure
Fracture toughness
Grain boundaries
Transmission electron microscopy
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites

Cite this

Rod-like Si 3N 4 grain growth in the sintered body of amorphous Si 3N 4-BN composite powder with sintering additives. / Kugimoto, Hironori; Uehara, Masato; Enomoto, Naoya; Hojo, Junichi.

In: Journal of Ceramic Processing Research, Vol. 4, No. 1, 2003, p. 6-9.

Research output: Contribution to journalArticle

Kugimoto, Hironori ; Uehara, Masato ; Enomoto, Naoya ; Hojo, Junichi. / Rod-like Si 3N 4 grain growth in the sintered body of amorphous Si 3N 4-BN composite powder with sintering additives. In: Journal of Ceramic Processing Research. 2003 ; Vol. 4, No. 1. pp. 6-9.
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