Densification of AlN ceramics by spark plasma sintering under 1550 °c

Ryota Kobayashi, Yoshihiro Nakajima, Kenji Mochizuki, Koichi Harata, Takashi Goto, Kentaro Iwai, Junichi Tatami

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We fabricated AlN ceramics at sintering temperatures with a minimum of 1450 °C using spark plasma sintering (SPS) with Y2O3-CaO-B or Y2O3-CaO-LaB6 sintering additives. The relative densities of the AlN ceramics sintered at 1500 °C for 10 min with a uniaxial pressure of 50 MPa exceeded 98%, indicating sufficient densification. However, with decreasing the sintering temperature to 1450 °C, the relative densities were decreased to ∼90%. An increase in the uniaxial pressure to 100 MPa or the extension of sintering time to 30 min were found to promote the densification of AlN ceramics. The relative densities of the AlN ceramics sintered reached 99% even at a sintering temperature of 1450 °C. The samples had dense and fine textures with an average grain size of ∼1 μm. The thermal conductivities of the samples varied with relative density between 30 and 80 W m-1 K-1.

Original languageEnglish
Pages (from-to)860-863
Number of pages4
JournalAdvanced Powder Technology
Volume27
Issue number3
DOIs
Publication statusPublished - 2016 May 1

Keywords

  • Aluminum nitride
  • SPS
  • Sintering behavior
  • Thermal conductivity

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanics of Materials

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