Abstract
Low‐thermal‐expansion porous ceramics are required for numerous applications. This work develops low‐thermal‐expansion porous ceramics by using SiC and ZrW2O8 as positive and negative thermal expansion materials, respectively, bonded by a glassy material. The mixture of SiC, ZrW2O8, 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 ZrW2O8, particle size 20–45 μm or 45–90 μm can preserve ZrW2O8 during the sintering process and have a low thermal expansion coefficient. Samples sintered by the conventional method have a high thermal expansion coefficient because ZrW2O8 decomposes to ZrO2 and WO3 at the sintering temperature.
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