Production of cordierite ceramic by aqueous tape casting process

✍ Scribed by Emel Ozel; Semra Kurama

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 862 KB
• Volume: 198
• Category: Article
• ISSN: 0924-0136
• DOI: 10.1016/j.jmatprotec.2007.06.064

✦ Synopsis

Tape-casting process was used to produce cordierite ceramics in an aqueous system with polyvinylalcohol (PVA), and polyethyleneglicol (PEG), as binder and plasticizer, respectively.

Before starting to tape-casting studies, optimum amount of sodium tripolyphosphate (STPP, Na 5 P 3 O 10 ) was used by sedimentation method for dispersing the powders. The sedimentation of raw materials (Kaolin, Al 2 O 3 and Talc) with STPP, as a dispersant for 20 wt.% solid content was performed. Various tape slips with different solid content (50-55-60 wt.%) and 10-12 wt.% PEG + PVA were prepared. The influence of the solid content on the rheological properties of slips and the resultant green tapes were studied. The increase in the PVA + PEG content deteriorated the slip properties and fostered the formation of bubbles in the slip. In addition, the properties of the sintered tapes were investigated. The slip composition, 10 wt.% PVA + PEG for 55 wt.% solid content produced green tapes with good surface properties and flexibility that had higher sintered density.