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Development of Low‐Thermal‐Expansion Silicon Carbide/Zirconium Tungstate Porous Ceramics
Author(s) -
Poowancum Anurat,
Matsumaru Koji,
Ishizaki Kozo
Publication year - 2010
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.1551-2916.2010.03952.x
Subject(s) - materials science , sintering , thermal expansion , negative thermal expansion , spark plasma sintering , composite material , porosity , ceramic , tungstate , zirconium , silicon carbide , zirconium carbide , carbide , metallurgy
Low‐thermal‐expansion porous ceramics are required for numerous applications. This work develops low‐thermal‐expansion porous ceramics by using SiC and ZrW 2 O 8 as positive and negative thermal expansion materials, respectively, bonded by a glassy material. The mixture of SiC, ZrW 2 O 8 , and glassy material was sintered by the conventional method or pulsed electric current sintering (PECS, or sometimes called spark plasma sintering) at 850°C. In samples sintered by PECS with ZrW 2 O 8 , particle size 20–45 μm or 45–90 μm can preserve ZrW 2 O 8 during the sintering process and have a low thermal expansion coefficient. Samples sintered by the conventional method have a high thermal expansion coefficient because ZrW 2 O 8 decomposes to ZrO 2 and WO 3 at the sintering temperature.