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Fabrication of translucent AlN ceramics with MgF 2 additive by spark plasma sintering
Author(s) -
Son HyoungWon,
Kim ByungNam,
Suzuki Tohru S.,
Suzuki Yoshikazu
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15726
Subject(s) - spark plasma sintering , materials science , transmittance , sintering , ceramic , fabrication , composite material , transgranular fracture , absorption (acoustics) , hexagonal crystal system , optoelectronics , microstructure , grain boundary , crystallography , intergranular fracture , chemistry , medicine , alternative medicine , pathology
Translucent AlN ceramics with 0‐2 wt.% MgF 2 additive were prepared by spark plasma sintering. AlN powder was heated temporarily up to 2000°C, before holding at 1850°C for 20 minutes in N 2 gas. The sintered ceramics consisted of a single phase of hexagonal AlN, and showed a transgranular fracture mode. The total transmittance was improved remarkably by the additive, to reach 74% at a wavelength of 800 nm for 1 wt.% MgF 2 . For 2 wt.% MgF 2 , the transmittance was slightly lower than that for 1 wt.% MgF 2 , and an absorption band was observed apparently at around 400 nm. The addition of MgF 2 along with the temporary heating at higher temperatures than the sintering temperature contributed to improve the transmittance remarkably.