期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 39, 期 8, 页码 2712-2719出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.03.025
关键词
Alumina; High-pressure spark plasma sintering; Transparent; Hardness
资金
- Israel Ministry of Defense [440243997/634]
Transparent alumina was fabricated from untreated commercial powder by high-pressure spark plasma sintering (HPSPS) at temperatures of 1000, 1050 and 1100 degrees C under pressures of 250-800 MPa. It was established that transparency strongly depends on the HPSPS parameters. At all temperatures, there was a certain point when increasing the pressure led to decreasing transparency. At 1100 degrees C, relatively high pressure led to excessive grain growth, as well as the formation of creep-induced porosity at the center of the samples. Hardness values decreased with pressure due to grain growth, correlated with the Hall-Petch relationship. The optimal combination of optical and mechanical properties (68% in-line transmittance at a wavelength of 640 nm and a hardness value of about 2300 HV2) was achieved after sintering at 1050 degrees C under 600 MPa.
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