Thermal and mechanical properties of hot pressed translucent Y 2O3 doped Mg-α/β-Sialon ceramics

Bhupendra Joshi, Gobinda Gyawali, Hao Wang, Tohru Sekino, Soo Wohn Lee

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Different Sialon phases, intergranular phase and sinterbility of additives play an important role on thermal, mechanical and optical properties of Sialon ceramics. Hot pressed translucent Mg-α/β-Sialon composite was fabricated with MgO as a sintering additive. But with MgO, complete densification was not achieved because of its higher viscosity and higher melting point. Y2O3 is one of the best sintering additives to achieve complete densification and good mechanical properties in silicon nitride based ceramics. Therefore, different amount of Y2O 3 was added to Mg-α/β-Sialon composite and effect of Y2O3 addition on microstructure, thermal, mechanical and optical properties was investigated. α-Sialon phase was increased with increasing the amount of Y2O3 up to 1 wt.%, but addition of 2 wt.% Y2O3, most β-Sialon phase was observed. Thermal conductivity and coefficient of thermal expansion values were increased with increasing the amount of Y2O3. However, translucency was decreased in higher Y2O3 addition.

Original languageEnglish
Pages (from-to)112-119
Number of pages8
JournalJournal of Alloys and Compounds
Volume557
DOIs
Publication statusPublished - 2013 Apr 25

Keywords

  • Microstructure
  • Optical properties
  • Sialon
  • Sintering
  • Thermal properties

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Thermal and mechanical properties of hot pressed translucent Y <sub>2</sub>O<sub>3</sub> doped Mg-α/β-Sialon ceramics'. Together they form a unique fingerprint.

Cite this