Mechanical and optical properties of spark plasma sintered transparent Y₂O₃ ceramics

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• 作者：Bahador Ahmadi ; Shoja Razavi Reza ; ¹ ; ^{shoja_r@mut-es.ac.ir" class="auth_mail" title="E-mail the corresponding author} ; Mehdi Ahsanzadeh-Vadeqani ; Masoud Barekat
• 关键词：Y2O3 ; SPS ; Hardness ; Flexural strength ; Transmission
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 November 2016
• 年：2016
• 卷：42
• 期：15
• 页码：17081-17088
• 全文大小：2407 K

文摘

Commercial Y₂O₃ nanopowder was used to fabricate transparent Y₂O₃ ceramics by spark plasma sintering under the pressure of 100 MPa for 20 min with the heating rate of 100 °C/min. The microstructures, mechanical and optical properties of the Y₂O₃ ceramics sintered at different temperatures were investigated in detail. Densification occurred up to a sintering temperature of 1500 °C, and above 1500 °C, rapid grain growth and pore growth occurred. The highest relative density of 99.58% and the minimum average grain size of 0.58±0.11 µm were obtained at 1500 °C. The flexural strength, hardness and fracture toughness of the optimal spark plasma sintered Y₂O₃ ceramic were 122 MPa, 7.60 GPa and 2.06 MPa.m^1/2, respectively. The Y₂O₃ ceramic sintered at 1500 °C had the in-line transmission of about 11–54% and 80% in the wavelength range of 400–800 nm and 3–5 µm, respectively.