Effects of a carbothermal reduction reaction on the microstructure of nano-silicon nitride ceramics

Horng Hwa Lu, Yi Chi Huang, Alex C. Lee, Jow Lay Huang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this study, using amorphous nano-Si3N4 as the starting powder, the oxides on the Si3N4 powder surface were removed by carbothermal reduction to prevent the formation of the O′-sialon phase in the sintered product. The results indicate that carbothermal reduction can be effectively induced at 1250 °C and produce single-phase Si3N4. However, as the temperature increased, the liquid phase that formed during Si3N4 sintering began to impede the carbothermal reduction. Analysis revealed that when the temperature exceeded 1350 °C, the reaction gradually shifted from that of carbothermal reduction to that of decomposition, and residual carbon and O′-sialon phase were observed in the sintered product.

Original languageEnglish
Pages (from-to)14313-14317
Number of pages5
JournalCeramics International
Volume40
Issue number9 PART A
DOIs
Publication statusPublished - 2014 Jan 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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