Exploring the evolution of pores in HIPed Y2O3 transparent ceramics

Ying Wang, Jun Wang, Meng Ni, Peng Liu, Jian Zhang, Kuo Yang Lee, Hsing I. Hsiang, Zhili Dong, Dingyuan Tang

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Y2O3 transparent ceramics were fabricated by using vacuum sintering followed by hot isostatic pressing (HIPing). After HIP, large pores were eliminated, but a certain amount of nano-sized pores survived. Air annealing is required to bleach the as-HIPed ceramics. However, the annealing temperatures affected the transparency by affecting the evolution of the residual nano-pores. A high annealing temperature of ≥1600 °C resulted in obvious pore growth and loss of transparency of the samples. Pressure-less thermal expansion and shrinkage behaviors of the as-HIPed Y2O3 ceramics were studied in detail. The high annealing temperature (1600 °C) could lead to obvious swelling of both the pore sizes and the dimensions of the samples. It implies that the swelling of pores is not only from the diffusion and aggregation of the existing smaller pores, but may also from the thermal expansion of the high-pressure precipitated insoluble gas.

Original languageEnglish
Pages (from-to)11637-11643
Number of pages7
JournalCeramics International
Issue number8
Publication statusPublished - 2021 Apr 15

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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