Premium
Optically Transparent Polycrystalline Al 2 O 3 Produced by Spark Plasma Sintering
Author(s) -
Jiang DongTao,
Hulbert Dustin M.,
AnselmiTamburini Umberto,
Ng Terry,
Land Donald,
Mukherjee Amiya K.
Publication year - 2008
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/j.1551-2916.2007.02086.x
Subject(s) - spark plasma sintering , materials science , sintering , transmittance , annealing (glass) , crystallite , porosity , composite material , transparent ceramics , metallurgy , residual stress , grain boundary , microstructure , optoelectronics
The spark plasma sintering (SPS) technique was used to produce mid‐infrared (IR) transparent alumina with the desired transmittance. An excellent transmittance of 85% has been obtained in a sample sintered at 1300°C for 5 min. The heating rate, sintering time, and annealing have a significant influence on IR transmittance. The improvement in transmission may be attributed to the progressive elimination of residual porosity when applying a slower heating rate, longer sintering time during SPS, and postsinter annealing. It is suggested that localized residual strain/stress at grain boundaries and oxygen vacancy concentration are other factors influencing the optical properties of the SPS‐sintered alumina.