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Surface Modification and Microstructure Design of Alumina Ceramics
Author(s) -
Liu Zifeng,
Shao Shuqing,
Hu Xiaozhi,
Wang Xin
Publication year - 2011
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.1551-2916.2011.04705.x
Subject(s) - microstructure , sintering , materials science , ceramic , porosity , substrate (aquarium) , composite material , slip (aerodynamics) , grain size , oceanography , physics , thermodynamics , geology
Microstructures and properties of alumina ceramics are sensitive to sintering additives, and commercially available ready‐to‐press alumina powders may not contain required sintering additives for specific applications. We show a simple and practical way of microstructure design of alumina ceramics made from the commercial powders through surface modification. The method utilizes the micro‐porous feature of an alumina green body pre‐sintered at 1000°C, and deposits ultra‐low‐density sintering additive slips onto the micro‐porous substrate. The surface microstructures can be refined if an ultra‐low‐density MgO or SiO 2 slip is deposited onto the substrate, whereas a TiO 2 slip leads to coarser and extended grain structures. TiO 2 /MgO , SiO 2 /MgO , and TiO 2 /SiO 2 combinations have also been tested, so that various surface modifications can be achieved.