Articles
  • Effects of high-energy ball milling of commercial Y2O3 powders on their densification using spark plasma sintering
  • Cheol Woo Park, Jung Hun Lee, Suk Hyun Kang, Jae Hwa Park, Hyun Mi Kim, Hyo Sang Kang, Hee Ae Lee, Joo Hyung Lee, Jun Hyeong In, and Kwang Bo Shim*
  • Division of Advanced Materials Science and Engineering, Hanyang University, Seoul 04763, Korea
Abstract
Commercial Y2O3 powders were treated by high-energy ball milling (HEBM) and then subjected to spark plasma sintering (SPS) in a furnace at 1600 oC under 30 MPa for 5 minutes to produce pure Y2O3 transparent ceramics. The sintered Y2O3 bodies show a relative density of about 99.52% and a grain size of about 3.2 μm, which is approximately six times smaller than that of the specimen obtained using commercial powders. This result shows that HEBM is highly effective in improving the sinterability of Y2O3 with the controlled grain growth. The transmittance of all sintered specimen was similar in the infrared region (2000 nm), but the specimen that underwent HEBM showed excellent transmittance in the visible light region (700 nm). In particular, the hardness and fracture strengths of the sintered bodies that underwent HEBM were 8.48 GPa and 0.91MPa·m1/2, respectively, demonstrating excellent mechanical characteristics.

Keywords: Y2O3 transparent ceramics, Spark plasma sintering, High energy ball milling, Densification.

This Article

  • 2018; 19(2): 179-182

    Published on Apr 30, 2018