access icon free Low-pressure fabrication of IR-transparent Y2O3 via spark plasma sintering

Different pressures of 80 and 90 MPa were applied to produce Y2O3 ceramics by spark plasma sintering in this work. Effects of pressure were investigated on densification, microstructure, infrared (IR) transmission and mechanical properties. It was found that applying higher pressure led to finer microstructure and consequently higher hardness and fracture toughness. An IR-transparent Y2O3 ceramic with 60% transmission at wavelength of 5 µm was obtained by sintering at 1300°C under uniaxial pressure of 90 MPa. This sample had an average grain size of 0.76 µm and hardness and fracture toughness of 9.37 GPa and 1.60 MPa.m1/2, respectively.

Inspec keywords: plasma materials processing; ceramics; sintering; grain size; densification; transparency; hardness; yttrium compounds; fracture toughness; infrared spectra

Other keywords: transparency; grain size; low-pressure fabrication; Y2O3; infrared transmission spectra; fracture toughness; yttria ceramics; densification; wavelength 5 mum; spark plasma sintering; microstructure; high-pressure effects; pressure 90 MPa; pressure 80 MPa; hardness; temperature 1300 degC; mechanical properties

Subjects: Fatigue, embrittlement, and fracture; Microstructure; Preparation of ceramics and refractories; Powder techniques, compaction and sintering; Plasma applications in manufacturing and materials processing; Infrared and Raman spectra in inorganic crystals; Fatigue, brittleness, fracture, and cracks; Optical constants and parameters (condensed matter)

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