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New Uniformly Porous CaZrO 3 /MgO Composites with Three‐Dimensional Network Structure from Natural Dolomite
Author(s) -
Suzuki Yoshikazu,
Morgan Peter E. D.,
Ohji Tatsuki
Publication year - 2000
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.1151-2916.2000.tb01519.x
Subject(s) - dolomite , porosity , materials science , sintering , cubic zirconia , pyrolysis , composite material , doping , mineralogy , chemical engineering , ceramic , metallurgy , chemistry , optoelectronics , engineering
Porous CaZrO 3 /MgO composites with a uniform three‐dimensional (3‐D) network structure have been successfully synthesized using reactive sintering of highly pure mixtures of natural dolomite (CaMg(CO 3 ) 2 ) and synthesized zirconia powders with LiF additive. Equimolar dolomite and zirconia powders doped with 0.5 wt% LiF were cold isostatically pressed at 200 MPa and sintered at 1100–1400°C for 2 h in air. Through the liquid formation via LiF doping, strong necks were formed between constituent particles before completion of the pyrolysis of dolomite, resulting in the formation of a 3‐D network structure. During and after the formation of the network structure, CO 2 was given off to form a homogeneous open‐pore structure. The pore‐size distribution was very narrow (with pore size ∼ 1 μm), and the porosity was controllable (e.g., ∼30%–50%) by changing the sintering temperature. The porous composites can be applied as filter materials with good structural stability at high temperatures.